CN103018517A

CN103018517A - Wireless electrical measuring instrument

Info

Publication number: CN103018517A
Application number: CN2012105244766A
Authority: CN
Inventors: 葛泉波; 程凯韬; 汤显峰; 高超; 杜明; 邵岳军
Original assignee: NINGBO JIMING ELECTRIC APPLIANCE CO Ltd
Current assignee: Ningbo Feituo Electric Appliance Co ltd
Priority date: 2012-12-04
Filing date: 2012-12-04
Publication date: 2013-04-03
Anticipated expiration: 2032-12-04
Also published as: CN103018517B

Abstract

The invention discloses a wireless electrical parameter measuring instrument which is mainly composed of a core control and communication module, a power management module, an electrical parameter measuring module and a display/indicate and control module. The core control and communication module comprises a core controller circuit, a serial port and a universal serial bus (USB) communication circuit. The power management module serves as a power management circuit. The electrical parameter measuring module comprises a small scale electric quantity, current and power consumption measurement circuit, a large scale electric quantity, current and power consumption measurement circuit, a voltage measurement circuit and a protection circuit. The display/indicate and control module serves as a display/indicate and control circuit. The wireless electrical parameter measuring instrument enables a communication mode to be improved from old single local control display to wireless and wired modes to read data and simultaneously does not reduce original measuring functions.

Description

A kind of radio parameter measuring instrument

Technical field

The present invention relates to a kind of electric parameter measurement field, be specifically related to a kind of electrical parameter measuring instrument based on wireless communication technology.

Background technology

Advanced surveying instrument has become the essential condition of electronic product exploitation, also is the most important thing of electron trade development.Multimeter is used for measuring the various electrical quantitys relevant with circuit, and such as electric current, voltage etc. is class surveying instrument commonly used.Existing multimeter is mostly to adopt wired local measurement control display, realizes showing to the measurement of this geoelectric parameter and at local multimeter, and directly reads.So that later obtaining and analyzing added the maintenance function usually in the multimeter, just freeze shown value in case detect stable reading for making the user that measurement data can be preserved.In order to start this maintenance function, the user must press a button and then press this button to discharge this demonstration before measure.

Fluke company releases Wireless Display digital multimeter Fluke233, realized the reliable and stable Wireless Data Transmission between multimeter main frame and the separable demonstration module, really realize the combination of wireless communication technology and the success of multimeter Electrical Measurement Technology, greatly improved its scope of application.But it is also failed to realize and the communicating by letter of computing machine, can realize remote real-time data analysis and demonstration at host computer.

Detect in the application at some, usually need a plurality of electrical quantitys are measured simultaneously, detect simultaneously voltage, electric current and three parameters of electric weight as needing in the battery performance testing process, the surveying instruments such as existing multimeter there is no method and realize this function.In addition, existing multimeter can only detect electrical quantity size sometime in real time, but can't be to being implemented the demonstration to this parameter variation tendency within a period of time.

Summary of the invention

For the problems referred to above, the present invention proposes a kind of radio parameter measuring instrument, is used for gathering voltage, electric current, electric weight and four kinds of electrical quantitys of power consumption.

The technical solution used in the present invention is: adopt the SI1000 chip as core control and rf chip, the work of conditioning unit various piece.Utilize the LTC2924 chip to realize the measurement of electric weight, electric current and three parameters of power consumption, and adopt LTC1858 to finish the measurement of voltage.Adopt LTC3558 that instrument is carried out power management, the present invention can use USB, power supply adaptor and lithium battery power supply, and when externally fed is arranged to lithium cell charging.Adopt wireless and wired two kinds of communication modes, wherein wireless mode can carry out multiple devices the networking measurement, and wired mode can be with the data upload that gathers to host computer, mainly provide RS232 and USB two kinds of interfaces, 232 serial communications utilize MAX3232 to realize, RS232 turns the usb communication chip and utilizes FT232R to realize.In addition, by the real-time four kinds of electrical parameter values and the communication pattern that arrive of display measurement of LM6038FDW liquid crystal display.

A kind of radio parameter measuring instrument, its instrument internal mainly are comprised of with control module core control and communication module, power management module, electrical parameter measuring module and demonstration/indication.

Core control comprises core controller circuit and serial ports and usb communication circuit with communication module.

The core controller circuit comprises core main control chip U1, duplexer chip U2; The 38 resistance, the 39 resistance and the 40 resistance; 18 capacitor C 10～C27; The 3rd inductance L 3, the 4th inductance L 4, the five inductance L 5, the 6th inductance L 6 and the 7th inductance L 7; The first crystal oscillator Y1, the second crystal oscillator Y2 and the 3rd crystal oscillator Y3; A radio-frequency antenna plug receptacle J4 and ten needle socket P15.

1 pin of ten needle socket P15 meets MCU_VCC, and 2 pin of P15,3 pin and 9 pin meet MCU_GND; 4 pin of ten needle socket P15 meet P2.7/C2D, 5 pin of ten needle socket P15 meet P0.2/XTAL1, and 6 pin of ten needle socket P15 meet RX-RS485, and 7 pin of ten needle socket P15 meet RST/C2CK, 8 pin of ten needle socket P15 meet TX-RS485, and 10 pin of ten needle socket P15 meet P1.0/AGND.1 pin of radio-frequency antenna plug receptacle J4 connects an end of inductance L 6 and an end of capacitor C 21, and 2 pin of connection of antenna socket J4,3 pin, 4 pin and 5 pin meet RF_GND; Another termination RF_GND of capacitor C 21.One end of another termination capacitor C 17 of inductance L 6 and an end of capacitor C 22, another termination RF_GND of capacitor C 22; 5 pin of another termination duplexer chip U2 of

capacitor C

17,4 pin of chip U2 connect 26 pin of chip U1, and 6 pin of chip U2 connect 25 pin of chip U1, and 3 pin of chip U2 connect an end of

capacitor C

15,2 pin of chip U2 meet RF_GND, and 1 pin of chip U2 connects an end of capacitor C 23; One section and 18 pin of core main control chip U1 of another termination inductance L 7 of capacitor C 23.19 pin of another chip termination U1 of inductance L 7 and an end of capacitor C 27, another termination RF_GND of capacitor C 27; Another termination inductance L 3 of capacitor C 15.One end of another termination capacitor C 16 of inductance L 3 and an end of inductance L 4, another termination RF_GND of capacitor C 16; One end of inductance L 4 another termination capacitor C 14 and an end of capacitor C 20 and an end of inductance L 5; The other end of another termination inductance L 5 of capacitor C 20 and an end of resistance R 40, another termination RF_GND of resistance R 40.17 pin of another chip termination U1 of inductance C14 and an end of inductance L 2; One end of one end of another termination capacitor C 12 of inductance L 2, an end of capacitor C 13, capacitor C 10 and an end of capacitor C 11, and be connected with RF_VCC with 16 pin of chip U1; The other end that capacitor C 12, capacitor C 13, capacitor C 10 are connected with capacitor C all connects RF_GND; 15 pin of chip U1 meet P2.6.43 pin of chip U1 meet RF_GND, 23 pin of chip U1 meet RF_GND, 24 pin of chip U1 connect 2 pin of crystal oscillator Y3,27 pin of chip U1 connect an end of capacitor C 24 and an end of capacitor C 26,28 pin of chip U1 meet an end and the RF_VCC of capacitor C 25,29 pin of chip U1 meet P0.7/IREFO, 30 pin of chip U1 meet P0.6/CNVSTR, 31 pin of chip U1 meet P0.5/RX, 32 pin of chip U1 meet P0.4/TX, 33 pin of chip U1 meet P0.3/XTAL2,34 pin of chip U1 meet P0.2/XTAL1, and 35 pin of chip U1 meet P0.1/AGND, and 43 pin of chip U1 meet MCU_GND, another termination RF_GND of crystal oscillator Y3, capacitor C 24, the other end that capacitor C 26 is connected with capacitor C all connects RF_GND.1 pin of chip U1 connects 1 pin of crystal oscillator Y2, and 2 pin of chip U1 meet P2.5, and 3 pin of chip U1 meet P2.4,4 pin of chip U1 meet P2.3,5 pin of chip U1 meet P2.2, and 6 pin of chip U1 meet P2.1, and 7 pin of chip U1 meet P2.0,8 pin of chip U1 meet P1.7,9 pin of chip U1 meet P1.6, and 10 pin of chip U1 meet P1.5, the 11 pin connecting resistance R38 of chip U1,12 pin of chip U1 connect 1 pin of crystal oscillator Y1, and 13 pin of chip U1 connect 3 pin of crystal oscillator Y1.2 pin of crystal oscillator Y1 with are connected pin and all connect RF_GND.2 pin of crystal oscillator Y2 connect 42 pin of chip U1.41 pin of chip U1 meet P2.6,40 pin of chip U1 meet P2.7/C2D, and the end of the 39 pin connecting resistance R39 of chip U1,38 pin of chip U1 connect with an end of capacitor C 18, an end of capacitor C 19 and be connected with MCU_VCC, 37 pin of chip U1 meet MCU_GND, and 36 pin of chip U1 meet P0.0/VREF.The other end that capacitor C 18 is connected with capacitor C all connects MCU_GND.

Serial ports and usb communication circuit comprise USB interface conversion chip U8, RS232 serial ports transceiving chip U9, demultiplexing device bus switch U10; Six resistance R 44～R49; Ten capacitor C 28～C37; USB plug receptacle J5, serial ports plug receptacle J6; Two three needle socket P16 and P17; Two light emitting diode D7 and D8.

16 pin of RS232 serial ports transceiving chip U9 connect an end of MCU_VCC and capacitor C 32, another termination MCU_GND of capacitor C 32; 2 pin of chip U9 connect capacitor C 33, another termination MCU_GND of capacitor C 33; 14 pin of chip U9 meet RS233RXD, and 13 pin of chip U9 meet RS233TXD, and 6 pin of chip U9 connect an end of capacitor C 37, another termination MCU_GND of C37; 1 pin of chip U9 connects an end of capacitor C 29,3 pin of another chip termination U9 of capacitor C 29; 4 pin of chip U9 connect an end of capacitor C 34,5 pin of another chip termination U9 of capacitor C 34; 11 pin of chip U9 meet CMOS_TXD, and 12 pin of chip U9 meet CMOS_RXD, and 15 pin of chip U9 meet MCU_GND.2 pin of serial ports plug receptacle J6 meet RS233RXD, and 3 pin of serial ports plug receptacle J6 meet RS233TXD, and 5 pin of serial ports plug receptacle J6,10 pin and the pin of being connected all connect MCU_GND.6 pin of USB plug receptacle J5 meet MCU_GND; 1 pin of USB plug receptacle J5 connects an end of capacitor C 30 and an end of resistance R 46, another termination MCU_GND of capacitor C 30, the other end of resistance R 46 is connected another termination MCU_GND of capacitor C 31 with an end of capacitor C 31,3 pin of USB_VCC, three needle socket P16 and 20 pin of USB interface conversion chip U8; 2 pin of socket P16 are connected with an end of 4 pin of chip U8, MCU_VCC and capacitor C 28, and another termination MCU_GND of capacitor C 28,1 pin of socket P16 connect 17 pin of U8 and an end of capacitor C 36, another termination MCU_GND of capacitor C 36.The end of the 2 pin connecting resistance R47 of USB plug receptacle J5,16 pin of another termination U8 of resistance R 47; The end of the 3 pin connecting resistance R48 of USB plug receptacle J5,15 pin of another termination U8 of resistance R 48; 4 pin, 5 pin of USB plug receptacle J5 meet MCU_GND; The two ends of capacitor C 35 meet respectively MCU_VCC and MCU_GND.1 pin of chip U8 meets USB_TXD, and 5 pin of chip U8 meet USB_RXD, the negative pole of the 23 pin sending and receiving optical diode D7 of chip U8, the end of the anodal connecting resistance R44 of light emitting diode D7, another termination USB_VCC of resistance R 44; The negative pole of the 22 pin sending and receiving optical diode D8 of chip U8, the end of the anodal connecting resistance R45 of light emitting diode D8, another termination USB_VCC of resistance R 45; 25 pin of chip U8,18 pin, 21 pin, 7 pin are drunk 6 pin and are all connected MCU_GND.1 pin of chip U10 meets S, 2 pin of chip U10 meet USB_RXD, 3 pin of chip U10 meet CMOS_TXD, 4 pin of chip U10 meet P0.4/TX, and 5 pin of chip U10 meet USB_TXD, and 6 pin of chip U10 meet CMOS_RXD, 7 pin of chip U10 meet P0.5/RX, 8 pin of chip U10 meet MCU_GND, and 16 pin of chip U10 meet MCU_VCC, and 15 pin of chip U10 meet MCU_GND.1 pin of three needle socket P17 meets MCU_GND, and 2 pin of three needle socket P17 meet S, the 3 pin connecting resistance R49 of three needle socket P17, another termination MCU_VCC of resistance R 49.

Power management module is mainly electric power management circuit, and this circuit comprises power management chip U3, digital control simulant electronic switch chip U4; 36 resistance R 1～R8, R10～R37, a slide resistor R9, a thermistor NTH1; Nine capacitor C 1～C9; The first inductance L 1 and the second inductance L 2; A light emitting diode D1; A battery BT1; A connector mouth J1 and a Mini USB plug receptacle J2.

No. 1 port of MiniUSB interface J2 is connected 20 pins with an end of an end of an end of an end of power supply, capacitor C 5, resistance R 4, capacitor C 3 respectively and is connected with power management chip U3; 2 pin of MiniUSB interface J2 meet RX-2, and 3 pin of MiniUSB interface J2 meet TX-2, and 4 pin of MiniUSB interface J2 connect respectively the other end of capacitor C 5 and ground connection.The end of the other end connecting resistance R6 of

resistance R

4 and 17 pins of chip U3, the other end ground connection of capacitor C 3; The end of another termination thermistor NTH1 of resistance R 6, the other end ground connection of thermistor NTH1; The end of the 19 pin connecting resistance R8 of power management chip U3, another termination 3V-VCC-1 of resistance R 8; The end of the 18 pin connecting resistance R10 of chip U3, the other end ground connection of resistance R 10; The 12 pin ground connection of chip U3, No. 16 of chip U3 and 3 pin meet 3V-VCC-1, and 15 pin of chip U3 meet EN2, and 3V-VCC-1 meets BAT, No. 1 and the 21 pin ground connection of chip U3; 2,7,8 pin of chip U3 connect respectively an end of capacitor C 4, an end of resistance R 3, the positive pole of battery BT1, an end of another termination capacitor C 1 of resistance R 3, the other end ground connection of capacitor C 1, the other end ground connection of capacitor C 4, the minus earth of battery BT1; 6 pin of chip U3 connect an end of inductance L 1, and the other end of inductance L 1 is the end of connecting resistance R5 respectively, an end of capacitor C 6, and an end of capacitor C 7, and meet 3V-VCC-1, the other end ground connection of capacitor C 7; The end of the 4 pin connecting resistance R7 of chip U3, the other end of resistance R 5, and the other end of capacitor C 6, the end of another termination slide rheostat R9 of resistance R 7, the other end ground connection of slide rheostat R9; 9 pin of chip U3 connect an end of inductance L 2, and the other end of inductance L 2 links to each other with 10 pin of chip U3; 11 pin of chip U3 are the end of connecting resistance R11 respectively, 5V-VCC-1, an end of capacitor C 8, and VOUT2, the other end ground connection of capacitor C 8; 13 pin of chip U3 connect the other end of R11, an end of resistance R 12, and an end of another termination capacitor C 9 of resistance R 12, the other end of capacitor C 9 links to each other with 14 pin of chip U3.The 6 pin ground connection of digital control simulant electronic switch chip U4; The end of the 11 pin connecting resistance R18 of chip U4 and A end, another termination 3V-VCC-1 of resistance R 18; The end of the 10 pin connecting resistance R19 of chip U4 and B end, another termination 3V-VCC-1 of resistance R 19; The end of the 9 pin connecting resistance R20 of chip U4 and C end, another termination 3V-VCC-1 of resistance R 20; The end of the 13 pin connecting resistance R23 of chip U4, the end of the other end connecting resistance R22 of resistance R 23, the other end ground connection of resistance R 22; The end of the 14 pin connecting resistance R25 of chip U4, the end of the other end connecting resistance R24 of resistance R 25, the other end ground connection of resistance R 24; The end of the 15 pin connecting resistance R27 of chip U4, the end of the other end connecting resistance R26 of resistance R 27, the other end ground connection of resistance R 26; The end of the 12 pin connecting resistance R29 of chip U4, the end of the other end connecting resistance R28 of resistance R 29, the other end ground connection of resistance R 28; The end of the 1 pin connecting resistance R31 of chip U4, the end of the other end connecting resistance R30 of resistance R 31, the other end ground connection of resistance R 30; The end of the 5 pin connecting resistance R33 of chip U4, the end of the other end connecting resistance R32 of resistance R 33, the other end ground connection of resistance R 32; The end of the 2 pin connecting resistance R35 of chip U4, the end of the other end connecting resistance R34 of resistance R 35, the other end ground connection of resistance R 34; 7, the 8 pin ground connection of chip U4; 3 pin of chip U4 meet FB2, and 16 pin of chip U4 meet 3V-VCC-1.One termination 3V-VCC-1 of resistance R 21, the end of other end sending and receiving optical diode D1, the other end ground connection of light emitting diode D1.

Electrical parameter measuring module comprises small-range electric weight, electric current and measurement of power loss circuit, wide range electric weight, electric current and measurement of power loss circuit, tension measuring circuit and holding circuit.

Small-range electric weight, electric current and measurement of power loss circuit comprise electrical measurement chip U14, three light coupling relay switch chip U15, U16 and U17; Six resistance R 74～R79; The 4th triode Q4 and the 5th triode Q5; Five needle socket P20, two ten needle socket P21 and P22.

5 pin of electrical measurement chip U14 connect 2 pin of ten needle socket P22, and 4 pin of chip U14 connect 6 pin of ten needle socket P22, and 3 pin of chip U14 connect 10 pin of ten needle socket P22; 1 pin of 1 pin of chip U14 and five needle socket P20, an end of the collector of triode Q4 and resistance R 74 is connected; 6 pin of chip U14 are connected with 6 pin of light coupling relay switch chip U15,4 pin of chip U15,6 pin of chip U17,4 pin of chip U17 and the other end of resistance R 74; The emitter of triode Q4 meets power supply 5V_VCC_1, the end of the base stage connecting resistance R78 of triode Q4, the collector of another termination triode Q5 of resistance R 78, the emitter of triode Q5 connects digitally DGND_2, the end of the base stage connecting resistance R79 of triode Q5, the other end of resistance R 79 connects 1 pin of ten needle socket P21.5 pin of chip U17 connect 2 pin of five needle socket P20, and 1 pin of chip U17 connects 3 pin of ten needle socket P21, the end of the 2 pin connecting resistance R77 of chip U17, and the other end of resistance R 77 connects digitally DGND_2.5 pin of chip U15 meet VOUT2, and 1 pin of chip U15 is connected with 5 pin of 1 pin of chip U16 with ten needle socket P21; The end of the 2 pin connecting resistance R75 of chip U15, the other end of resistance R 75 connects digitally DGND_2.The 2 pin connecting resistance R76 of chip U16,6 pin and 4 pin of chip U16 meet Ptest-, and 5 pin of chip U16 connect digitally DGND_2, and the other end of resistance R 76 connects digitally DGND_2.5 pin of five needle socket P20 connect digitally DGND_2; 10 pin of ten needle socket P21 connect digitally DGND_2; 1 pin of ten needle socket P22,3 pin, 7 pin, 4 pin and the pin of being connected all connect digitally DGND_2.

Wide range electric weight, electric current and measurement of power loss circuit comprise electrical measurement chip U18, three light coupling relay switch chip U19, U20 and U21; Five resistance R 80～R84; Five needle socket P23, two ten needle socket P24 and P25.

5 pin of electrical measurement chip U18 connect 2 pin of ten needle socket P25, and 4 pin of chip U18 connect 6 pin of ten needle socket P25, and 3 pin of chip U18 connect 10 pin of ten needle socket P25; 1 pin of chip U18 is connected another termination power 5V_VCC_2 of resistance R 80 with 1 pin of five needle socket P23, an end of resistance R 80 and an end of resistance R 81.6 pin of chip U18 are connected with 6 pin of light coupling relay switch chip U19,4 pin of chip U19,6 pin of chip U21,4 pin of chip U21 and the other end of resistance R 81; 5 pin of chip U21 connect 2 pin of five needle socket P23, and 1 pin of chip U21 connects 3 pin of ten needle socket P24, the end of the 2 pin connecting resistance R84 of chip U21, and the other end of resistance R 84 connects digitally DGND_4.5 pin of chip U19 meet VOUT3, and 1 pin of chip U19 is connected with 5 pin of 1 pin of chip U20 with ten needle socket P24; The end of the 2 pin connecting resistance R82 of chip U19, the other end of resistance R 82 connects digitally DGND_4.The 2 pin connecting resistance R83 of chip U20,6 pin and 4 pin of chip U20 meet Ptest2-, and 5 pin of chip U20 connect digitally DGND_4, and the other end of resistance R 83 connects digitally DGND_4.5 pin of five needle socket P23 connect digitally DGND_4; 10 pin of ten needle socket P24 connect digitally DGND_4; 1 pin of ten needle socket P25,3 pin, 7 pin, 4 pin and the pin of being connected all connect digitally DGND_4.

Tension measuring circuit comprises voltage measurement chip U12, solid-state relay switch pio chip U13; The 69 resistance R 69, the 72 resistance R 72, the 73 resistance R 73, three slide rheostat R68, R70 and R71; Six capacitor C 47～C52; The 13 stabilivolt D13 and the 14 stabilivolt D14.

The end of the 8 pin connecting resistance R73 of solid-state relay switch pio chip U13,7 pin of chip U13 connect the negative pole of diode D13, and 6 pin of chip U13 connect the end of slide rheostat R70; 5 pin of chip U13 are connected with 3 pin of the negative pole of stabilivolt D14, voltage measurement chip U12,5 pin of chip U12,7 pin of chip U12 and 9 pin of chip U12; 2 pin of chip U13 with are connected pin and connect digitally DGND_4,1 pin of chip U13 meets Low_span+, 3 pin of chip U13 meet Low_span-; The positive pole of stabilivolt D13 connects the positive pole of stabilivolt D14, the end of another termination slide rheostat R71 of resistance R 73,6 pin of another chip termination U12 of slide rheostat R71 and an end of resistance R 72, the end of another termination slide rheostat R68 of resistance R 72,8 pin of another chip termination U12 of slide rheostat R68 and an end of resistance R 69, the end of another termination slide rheostat R70 of resistance R 69, another termination Vin-of slide rheostat R70.1 pin of voltage measurement chip U12,14 pin, 17 pin and 18 pin meet simulation ground AGND_4; 10 pin of chip U12 connect 12 pin of chip U12, and 11 pin of chip U12 connect 13 pin of chip U12; 15 pin of chip U12 connect an end of capacitor C 50, another termination simulation ground AGND_4 of capacitor C 50; 16 pin of chip U12 connect an end of capacitor C 51 and an end of capacitor C 52, another termination simulation ground AGND_4 of the other end of capacitor C 51 and capacitor C 52; 19 pin of chip U12 connect with 20 pin of chip U12, an end of capacitor C 49, an end of capacitor C 47 and are connected with power supply 5V_VCC_2, another termination simulation ground AGND_4 of the other end of capacitor C 49 and capacitor C 47; 21 pin of chip U12 meet an end and the power supply 3V _ VCC_2 of capacitor C 48, another termination simulation ground AGND_4 of capacitor C 48; 22 pin of chip U12 connect , 23 pin of chip U12 meet SDO_4, and 24 pin of chip U12 connect digitally DGND_4, and 25 pin of chip U12 meet SDI_4, and 26 pin of chip U12 meet SCK_4, and 27 pin of chip U12 connect

Figure 2012105244766100002DEST_PATH_IMAGE004

, 28 pin of chip U12 meet CONVST.

Holding circuit comprises two normally opened relay K1 and K2; The 66 resistance R 66 and the 67 resistance R 67; The 46 capacitor C 46; Two field effect transistor Q1 and Q2; Four stabilivolt D9, D10, D11 and D12; 6 measuring probe socket J7～J12; The second hummer RL2; 1 fuse F1.

1 pin of relay normally open contact K2 meets probe socket J7,3 pin of relay normally open contact K2 meet probe socket J10,5 pin of relay normally open contact K2 connect digitally DGND_2,2 pin of relay normally open contact K2 connect the negative pole of stabilivolt D9,4 pin of relay normally open contact K2 connect the negative pole of stabilivolt D12, the end of the 6 pin connecting resistance R67 of relay normally open contact K2 and the end of hummer RL2; Another termination power 5V_VCC_1 of resistance R 67, the drain electrode of another termination field effect transistor Q2 of hummer RL2, the source electrode of field effect transistor Q2 connects digitally DGND_2, and the grid of field effect transistor Q2 connects the grid of field effect transistor Q1.1 pin of relay normally open contact K1 meets probe socket J8, the 3 pin plug receptacle J11 of relay normally open contact K1,5 pin of relay normally open contact K1 connect digitally DGND_2, and 1 pin of relay normally open contact K1 connects the end of fuse F1, another termination Iin2+ of fuse F1; 6 pin of relay normally open contact K1 connect the drain electrode of field effect transistor Q1 and an end of resistance R 66, another termination 5V_VCC_1 of resistance R 66, and the source electrode of field effect transistor Q1 connects digitally DGND_2.The positive pole of stabilivolt D9 connects the negative pole of stabilivolt D10, and the positive pole of stabilivolt D10 connects the positive pole of stabilivolt D11, and the negative pole of stabilivolt D11 connects the positive pole of stabilivolt D12.Probe socket J7 connects an end of capacitor C 46, and the other end of capacitor C 46 is connected with probe interface J10; Probe interface J9 meets Ptest+, and probe interface J12 meets Ptest-.

Show/indicate with control module to be mainly demonstration/indication and control circuit, this circuit comprises LCD MODULE U11; 16 resistance R 50～R65; Eight capacitor C 38～C45; The second diode D2, the 3rd light emitting diode D3, the 4th light emitting diode D4, the 5th light emitting diode D5 and the 6th light emitting diode D6; Five button K3～K7; Two ten needle socket P18 and P19; A battery BT2; The 8th inductance L 8; The 3rd triode Q3; A connector mouth J3; A single-pole double-throw switch (SPDT) QK1; A hummer RL1.

1 pin of LCD MODULE U11 meets AL/CC4_1, and 2 pin of module U11 meet LCD_P1, and 3 pin of module U11 meet LCD_P2, and 14 pin of module U11 meet 3V3, and 15 pin of module U11 connect digitally DGND_3; The end of the 16 pin connecting resistance R50 of module U11 and the collector of triode Q3, another termination 3V3 of resistance R 50, the base stage of triode Q3 meets LCD_P3, and emitter connects digitally DGND_3; 12 pin of module U11 meet SCL_3, and 13 pin of module U11 meet SDA_3.1 pin of ten needle socket P18,3 pin, 4 pin, 7 pin and the pin of being connected connect digitally DGND_3, and 5 pin and 7 pin of ten needle socket P18 meet 3V_VCC_4.1 pin of ten needle socket P19 meets LCD_P1,3 pin of ten needle socket P19 meet LCD_P2,5 pin of ten needle socket P19 meet LCD_P3,7 pin of ten needle socket P19 meet KEY_P1,9 pin of ten needle socket P19 meet KEY_P3,2 pin of ten needle socket P19 meet KEY_P2, and 4 pin of ten needle socket P19 meet LCD_P4, and 6 pin of ten needle socket P19,8 pin and the pin of being connected connect digitally DGND_3.The end of KEY_P1 connecting resistance R52, the other end of resistance R 52 is connected with 4 pin with an end of resistance R 51, an end of capacitor C 38 and 1 pin of button K3; Another termination 3V3 of resistance R 51, the other end of capacitor C 38 connects digitally DGND_3,2 pin of button K3 with are connected pin and connect digitally DGND_3.The end of KEY_P2 connecting resistance R54, the other end of resistance R 54 is connected with 4 pin with an end of resistance R 53, an end of capacitor C 39 and 1 pin of button K4; Another termination 3V3 of resistance R 53, the other end of capacitor C 39 connects digitally DGND_3,2 pin of button K4 with are connected pin and connect digitally DGND_3.The end of KEY_P3 connecting resistance R56, the other end of resistance R 56 is connected with 4 pin with an end of resistance R 55, an end of capacitor C 40 and 1 pin of button K5; Another termination 3V3 of resistance R 55, the other end of capacitor C 40 connects digitally DGND_3,2 pin of button K5 with are connected pin and connect digitally DGND_3.The end of KEY_P4 connecting resistance R58, the other end of resistance R 58 is connected with 4 pin with an end of resistance R 57, an end of capacitor C 41 and 1 pin of button K6; Another termination 3V3 of resistance R 57, the other end of capacitor C 41 connects digitally DGND_3,2 pin of button K6 with are connected pin and connect digitally DGND_3.The end of P0.6/CNVSTR connecting resistance R64, the end of the other end sending and receiving optical diode D5 of resistance R 64, another termination MCU_GND of light emitting diode D5; The end of P2.5 connecting resistance R63, the end of the other end sending and receiving light diode D4 of resistance R 63, another termination MCU_GND of light emitting diode D4; The end of P1.7 connecting resistance R62, the end of the other end sending and receiving light diode D3 of resistance R 62, another termination MCU_GND of light emitting diode D3.The end of P0.2/XTAL1 connecting resistance R60,1 pin and 4 pin of an end of the other end of resistance R 60 and resistance R 59, an end of capacitor C 44 and button K7; Another termination MCU_VCC of resistance R 59, another termination MCU_GND of capacitor C 44,2 pin and 3 pin of button K1 meet MCU_GND.P0.3/XTAL2 connects the positive pole of electrochemical capacitor C45, and the negative pole of electrochemical capacitor C45 connects the end of hummer RL1, the end of the other end connecting resistance R65 of hummer RL1, another termination MCU_GND of resistance R 65.One end of capacitor C 42 is connected with an end of BATT_IN and inductance L 8 respectively; Another termination MCU_GND of capacitor C 42; Another termination capacitor C 43 and MCU_VCC of inductance L 8, another termination MCU_GND of capacitor C 43.One termination MCU_VCC of resistance R 61, the positive pole of the other end sending and receiving optical diode D6 of resistance R 61, the negative pole of light emitting diode D6 meets MCU_GND.2 pin of connector mouth J3 with are connected pin and connect MCU_GND, 2 pin of the 1 pin order double-pole double throw switch QK1 of connector mouth J3; 1 pin of single-pole double-throw switch (SPDT) QK1 meets BATT_IN, and 2 pin of single-pole double-throw switch (SPDT) QK1 also link to each other with the negative pole of diode D2, and the positive pole of diode D2 connects 2 pin of battery BT2, and 1 pin of battery BT2 meets MCU_GND.

Beneficial effect of the present invention has: the present invention is modified into wireless and wired dual mode reading out data with communication mode from old-fashioned single local control display, does not lower again original measurement function simultaneously; The present invention can measure a plurality of electrical quantitys simultaneously, and has realized the automatic range measurement; The invention provides the communication interface with host computer, for the functions such as host computer data analysis and fault detect provide may.In a word, the present invention has expanded original measurement function greatly, and is convenient for users to use, for the industry spot large-range measuring provides possibility.

Description of drawings

Fig. 1 is structural representation of the present invention;

Fig. 2 is the core controller circuit diagram;

Fig. 3 is serial ports and usb communication circuit diagram

Fig. 4 is I ²C, SPI and UART expansion interface circuit figure;

Fig. 5 is electric power management circuit figure;

Fig. 6 is small-range electric weight, electric current and measurement of power loss circuit diagram;

Fig. 7 is wide range electric weight, electric current and measurement of power loss circuit diagram;

Fig. 8 is tension measuring circuit figure;

Fig. 9 is holding circuit figure;

Figure 10 shows/indication and control circuit figure.

Embodiment

In detail the present invention is made further instructions by embodiment below in conjunction with accompanying drawing.

As shown in Figure 1, a kind of radio parameter measuring instrument comprises core control and communication module, power management module, electrical parameter measuring module and demonstration/indication and control module.Core control mainly is comprised of core controller and wire communication module with communication module; Wherein core controller comprises microprocessor (MCU) and rf receiver and transmitter, and wire communication module comprises RS232 serial port module and usb communication module.Power management module is comprised of lithium battery, power supply adaptor and USB supply module.Electrical parameter measuring module is mainly by small-range electric weight, electric current and measurement of power loss circuit, wide range electric weight, electric current and measurement of power loss circuit, and tension measuring circuit and holding circuit consist of.Show/indicate with control module and comprise LCD liquid crystal display, LED, hummer and keyswitch.

Electrical parameter measuring module is the signals collecting front end, is responsible for issuing core controller on the simulating signal that collects.Core controller at first control survey front end is selected correct measurement range, determines to wait for that measuring nose changes into digital signal with simulating signal after the range, and gathers as required with data and pack; Packet uploads in the radio sensing network by radio receiving transmitting module, also can directly upload to host computer by RS232 serial ports or USB interface and carry out further analyzing and processing.Show/indicate with control module for four kinds of electrical parameter values controlling in this locality and display measurement arrives, communication pattern and battery status etc.Power management module then is responsible for the functions such as charging and discharging lithium battery control, power supply adaptor power supply input control, USB power supply input control and 0-5V output voltage control.

As shown in Figure 2, the core controller circuit part in core control and the communication module comprises core main control chip U1, duplexer chip U2; The 38 resistance, the 39 resistance and the 40 resistance; 18 capacitor C 10～C27; The 3rd inductance L 3, the 4th inductance L 4, the five inductance L 5, the 6th inductance L 6 and the 7th inductance L 7; The first crystal oscillator Y1, the second crystal oscillator Y2 and the 3rd crystal oscillator Y3; A radio-frequency antenna plug receptacle J4 and ten needle socket P15.

capacitor C

15,2 pin of chip U2 meet RF_GND, and 1 pin of chip U2 connects an end of capacitor C 23; One section and 18 pin of core main control chip U1 of another termination inductance L 7 of capacitor C 23.19 pin of another chip termination U1 of inductance L 7 and an end of capacitor C 27, another termination RF_GND of capacitor C 27; Another termination inductance L 3 of capacitor C 15.One end of another termination capacitor C 16 of inductance L 3 and an end of inductance L 4, another termination RF_GND of capacitor C 16; One end of inductance L 4 another termination capacitor C 14 and an end of capacitor C 20 and an end of inductance L 5; The other end of another termination inductance L 5 of capacitor C 20 and an end of resistance R 40, another termination RF_GND of resistance R 40.17 pin of another chip termination U1 of inductance C14 and an end of inductance L 2; One end of one end of another termination capacitor C 12 of inductance L 2, an end of capacitor C 13, capacitor C 10 and an end of capacitor C 11, and be connected with RF_VCC with 16 pin of chip U1; The other end that capacitor C 6, capacitor C 7, capacitor C 4 are connected with capacitor C all connects RF_GND; 15 pin of chip U1 meet P2.6.43 pin of chip U1 meet RF_GND, 23 pin of chip U1 meet RF_GND, 24 pin of chip U1 connect 2 pin of crystal oscillator Y3,27 pin of chip U1 connect an end of capacitor C 24 and an end of capacitor C 26,28 pin of chip U1 meet an end and the RF_VCC of capacitor C 25,29 pin of chip U1 meet P0.7/IREFO, 30 pin of chip U1 meet P0.6/CNVSTR, 31 pin of chip U1 meet P0.5/RX, 32 pin of chip U1 meet P0.4/TX, 33 pin of chip U1 meet P0.3/XTAL2,34 pin of chip U1 meet P0.2/XTAL1, and 35 pin of chip U1 meet P0.1/AGND, and 43 pin of chip U1 meet MCU_GND, another termination RF_GND of crystal oscillator Y3, capacitor C 24, the other end that capacitor C 26 is connected with capacitor C all connects RF_GND.1 pin of chip U1 connects 1 pin of crystal oscillator Y2, and 2 pin of chip U1 meet P2.5, and 3 pin of chip U1 meet P2.4,4 pin of chip U1 meet P2.3,5 pin of chip U1 meet P2.2, and 6 pin of chip U1 meet P2.1, and 7 pin of chip U1 meet P2.0,8 pin of chip U1 meet P1.7,9 pin of chip U1 meet P1.6, and 10 pin of chip U1 meet P1.5, the 11 pin connecting resistance R38 of chip U1,12 pin of chip U1 connect 1 pin of crystal oscillator Y1, and 13 pin of chip U1 connect 3 ends of crystal oscillator Y1.2 pin of crystal oscillator Y1 with are connected pin and all connect RF_GND.2 pin of crystal oscillator Y2 connect 42 pin of chip U1.41 pin of chip U1 meet P2.6,40 pin of chip U1 meet P2.7/C2D, and the end of the 39 pin connecting resistance R39 of chip U1,38 pin of chip U1 connect with an end of capacitor C 18, an end of capacitor C 19 and be connected with MCU_VCC, 37 pin of chip U1 meet MCU_GND, and 36 pin of chip U1 meet P0.0/VREF.The other end that capacitor C 18 is connected with capacitor C all connects MCU_GND.

As shown in Figure 3, serial ports and the usb communication circuit part in core control and the communication module comprises USB interface conversion chip U8, RS232 serial ports transceiving chip U9, demultiplexing device bus switch U10; Six resistance R 44～R49; Ten capacitor C 28～C37; USB plug receptacle J5, serial ports plug receptacle J6; Two three needle socket P16 and P17; Two light emitting diode D7 and D8.

Core controller among Fig. 2 and Fig. 3 is selected the SI1000 chip of Silicon Labs company, this chip internal is integrated low-power scm and RF transceiver chip.Wherein, its integrated 10 peripheral circuits such as AD, 64KB flash memory and analog comparator of single chip part have satisfied collection and the control function of tested electrical quantity.It has the emissive power of 20dBm the RF transceiver part, the receiving sensitivity of-121dBm, and the functions such as 240-960MHz frequency range have satisfied the signal transmission between the radio channel, can realize wireless networking function.RS232 serial communication among Fig. 3 utilizes MAX3232 to realize, RS232 turns usb communication and utilizes the FT232R chip to realize that communication baud rate is 115200.

Core controller and communication module also have simultaneously from detecting and troubleshooting function.Its fault mainly refers to deadlock, the damage of data processing module, or wireless channel is unusual.The watchdog module that scheme adopts SI1000 to carry carries out timing to CPU and detects, and house dog can reset to it automatically when crashing appears in CPU.

In order better to improve the extendability of core controller module, also reserved I in the present embodiment ²The most popular interfaces such as C, SPI and UART.As shown in Figure 4, I ²C, SPI and UART expansion interface circuit comprise I ²C bus extended chip U5, U6 and U7; The 41 resistance R 41, the 42 resistance R 42, the 43 resistance R 43; Ten ten needle socket P1～P6, P8～P11; Two five needle socket P7 and P12; Two eight needle socket P13 and P14.

1 pin of bus extended chip U5 meets P2.0,2 pin of chip U5 with are connected pin and connect digitally DGND_1,4 pin of chip U5 meet SW1_2, and 5 pin of chip U5 meet SW2_2, and 6 pin of chip U5 meet SW3_2,7 pin of chip U5 meet CHRG, 8 pin of chip U5 meet PRECT, and 9 pin of chip U5 meet A, and 10 pin of chip U5 meet B, 11 pin of chip U5 meet C, and 12 pin of chip U5 connect digitally DGND_1.24 pin of chip U5 meet power supply 3V_VCC_3; 23 pin of chip U5 connect 23 pin of chip U6, and 22 pin of chip U5 connect 22 pin of chip U6; The end of the 21 pin connecting resistance R42 of chip U5, another termination power 3V_VCC_3 of resistance R 42; 20 pin of chip U5 connect 1 pin of chip U6, and 18 pin of chip U5 meet Low_span-, and 17 pin of chip U5 meet Low_span+, and 16 pin of chip U5 meet CONVST, and 15 pin of chip U5 meet BUSY, and 14 pin of chip U5 meet SW1_4, and 13 pin of chip U5 meet EN2.The end of the 2 pin connecting resistance R41 of chip U6, another termination power 3V_VCC_3 of resistance R 41,3 pin of chip U6 with are connected pin and connect digitally DGND_1; 1 pin of the 4 pin combination hub P13 of chip U6,2 pin of the 5 pin combination hub P13 of chip U6,3 pin of the 6 pin combination hub P13 of chip U6,4 pin of the 7 pin combination hub P13 of chip U6,5 pin of the 8 pin combination hub P13 of chip U6,6 pin of the 9 pin combination hub P13 of chip U6,7 pin of the 10 pin combination hub P13 of chip U6,8 pin of the 11 pin combination hub P13 of chip U6; 12 pin of chip U6 connect digitally DGND_1; 1 pin of the 13 pin combination hub P14 of chip U6,2 pin of the 14 pin combination hub P14 of chip U6,3 pin of the 15 pin combination hub P14 of chip U6,4 pin of the 16 pin combination hub P14 of chip U6,5 pin of the 17 pin combination hub P14 of chip U6,6 pin of the 18 pin combination hub P14 of chip U6,7 pin of the 19 pin combination hub P14 of chip U6,8 pin of the 20 pin combination hub P14 of chip U6; 24 pin of chip U6 meet power supply 3V_VCC_3.1 pin of chip U7 with are connected pin and connect digitally DGND_1, the end of the 3 pin connecting resistance R49 of chip U7, another termination power 3V_VCC_3 of resistance R 49; 4 pin of chip U7 meet AL/CC3_1, and 5 pin of chip U7 meet AL/CC3_2, and 6 pin of chip U7 meet AL/CC3_3, and 7 pin of chip U7 meet AL/CC3_4; 8 pin of chip U7 connect digitally DGND_1; 9 pin of chip U7 meet AL/CC3_5, and 10 pin of chip U7 meet AL/CC3_6; 16 pin of chip U7 meet power supply 3V_VCC_3.1 pin of ten needle socket P1,3 pin, 4 pin, 7 pin and the pin of being connected connect digitally DGND_1; 5 pin and 9 pin of ten needle socket P1 meet power supply 3V_VCC_3; 2 pin of ten needle socket P1 meet AL/CC3_1, and 6 pin of ten needle socket P1 meet SDA_1, and 10 pin of ten needle socket P1 meet SCL_1.1 pin of ten needle socket P2,3 pin, 4 pin, 7 pin and the pin of being connected connect digitally DGND_1; 5 pin and 9 pin of ten needle socket P2 meet power supply 3V_VCC_3; 2 pin of ten needle socket P2 meet AL/CC3_2, and 6 pin of ten needle socket P2 meet SDA_1, and 10 pin of ten needle socket P2 meet SCL_1.1 pin of ten needle socket P3,3 pin, 4 pin, 7 pin and the pin of being connected connect digitally DGND_1; 5 pin and 9 pin of ten needle socket P3 meet power supply 3V_VCC_3; 2 pin of ten needle socket P3 meet AL/CC3_3, and 6 pin of ten needle socket P3 meet SDA_1, and 10 pin of ten needle socket P3 meet SCL_1.1 pin of ten needle socket P4,3 pin, 4 pin, 7 pin and the pin of being connected connect digitally DGND_1; 5 pin and 9 pin of ten needle socket P4 meet power supply 3V_VCC_3; 2 pin of ten needle socket P4 meet AL/CC3_4, and 6 pin of ten needle socket P4 meet SDA_1, and 10 pin of ten needle socket P4 meet SCL_1.1 pin of ten needle socket P5,3 pin, 4 pin, 7 pin and the pin of being connected connect digitally DGND_1; 5 pin and 9 pin of ten needle socket P5 meet power supply 3V_VCC_3; 2 pin of ten needle socket P5 meet AL/CC3_5, and 6 pin of ten needle socket P5 meet SDA_1, and 10 pin of ten needle socket P5 meet SCL_1.1 pin of ten needle socket P6,3 pin, 4 pin, 7 pin and the pin of being connected connect digitally DGND_1; 5 pin and 9 pin of ten needle socket P6 meet power supply 3V_VCC_3; 2 pin of ten needle socket P6 meet AL/CC3_6, and 6 pin of ten needle socket P6 meet SDA_1, and 10 pin of ten needle socket P6 meet SCL_1.1 pin of ten needle socket P7 connects 1 pin of ten needle socket P8,1 pin of ten needle socket P9 and 1 pin of ten needle socket P10; 3 pin of ten needle socket P7 connect 3 pin of ten needle socket P8,3 pin of ten needle socket P9 and 3 pin of ten needle socket P10; 7 pin of ten needle socket P7 connect 7 pin of ten needle socket P8,7 pin of ten needle socket P9 and 7 pin of ten needle socket P10; 9 pin of ten needle socket P7 connect 9 pin of ten needle socket P8,9 pin of ten needle socket P9 and 9 pin of ten needle socket P10.2 pin and 4 pin of ten needle socket P7 meet power supply 3V_VCC_3, and 5 pin of ten needle socket P7,6 pin, 8 pin and the pin of being connected connect digitally DGND_1; 2 pin and 4 pin of ten needle socket P8 meet power supply 3V_VCC_3, and 5 pin of ten needle socket P8,6 pin, 8 pin and the pin of being connected connect digitally DGND_1; 2 pin and 4 pin of ten needle socket P9 meet power supply 3V_VCC_3, and 5 pin of ten needle socket P9,6 pin, 8 pin and the pin of being connected connect digitally DGND_1; 2 pin and 4 pin of ten needle socket P10 meet power supply 3V_VCC_3, and 5 pin of ten needle socket P10,6 pin, 8 pin and the pin of being connected connect digitally DGND_1.1 pin of five needle socket P11 connects 1 pin of five needle socket P12, and 2 pin of five needle socket P11 meet power supply 3V_VCC_3, and 3 pin of five needle socket P11 connect 3 pin of five needle socket P12,4 pin of five needle socket P11 with are connected pin and connect digitally DGND_1.2 pin of five needle socket P12 meet power supply 3V_VCC_3,4 pin of five needle socket P12 with are connected pin and connect digitally DGND_1.

As shown in Figure 5, electric power management circuit comprises power management chip U3, digital control simulant electronic switch chip U4; 36 resistance R 1～R8, R10～R37, a slide resistor R9, a thermistor NTH1; Nine capacitor C 1～C9; The first inductance L 1 and the second inductance L 2; A light emitting diode D1; A battery BT1; A connector mouth J1 and a Mini USB plug receptacle J2.

resistance R

Power management chip among Fig. 5 adopts the LTC3558 chip of Linear Technology company.The user can select USB or power supply adaptor input power as required, LTC3558 control voltage to system power supply in to lithium cell charging.When inputting without external power source, can utilize lithium battery power supply.LTC3558 provides SW1 and the output of VOUT2 two ends, SW1 control output 3V voltage in the present embodiment, VOUT2 control output 1.2-5.5V voltage.Wherein CD4051 is digital control simulant electronic switch, as the gating foot control output voltage processed of VOUT2 port.Core controller can be read by the CHRG port real-time status of battery, and the effect of soft switch is played in the output of EN2 control VOUT2 port.

As shown in Figure 6, the small-range electric weight in the electrical parameter measuring module, electric current and measurement of power loss circuit part comprise electrical measurement chip U14, three light coupling relay switch chip U15, U16 and U17; Six resistance R 74～R79; The 4th triode Q4 and the 5th triode Q5; Five needle socket P20, two ten needle socket P21 and P22.

As shown in Figure 7, the wide range electric weight in the electrical parameter measuring module, electric current and measurement of power loss circuit part comprise electrical measurement chip U18, three light coupling relay switch chip U19, U20 and U21; Five resistance R 80～R84; Five needle socket P23, two ten needle socket P24 and P25.

In Fig. 6 and Fig. 7, little/the wide range electric weight, electric current and measurement of power loss all adopt the LTC2942 chip of Linear Technology company.When the medium and small range electric weight of Fig. 6, electric current and measurement of power loss, chip flows through the magnitude of voltage that the precision resistance of 50 milliohms between SENSE+ and the SENSE-produces by real-time detection electric current and calculates real-time current value (namely having realized the current measurement function of small-range).Process the charge value of waiting until in the unit interval through inner integration scheduling algorithm again.Because the measurement of power loss module need to be passed through this chip block equally, so circuit must comprise the electric parameter measurement commutation circuit.When measuring power consumption, the SW1_2 port drags down, and then closes the 5V power switch.Opening simultaneously light coupling relay chip U15 and chip U16 flows out the measuring instrument internal energy by electrical measurement chip U14.The energy that flows out by computing chip U14 obtains measuring the power consumption that plate consumes at the appointed time.When measuring the small-range electric weight, owing to consider simultaneously measuring voltage electric weight, so can't measure input voltage by chip U14, must provide a reference source for chip U14 simultaneously.Open SW1_2 during measurement, for chip U14 provides power supply and reference source, and open chip U17 electric current is inputted chip U14.

Wide range electric weight among Fig. 7, electric current and measurement of power loss principle are substantially identical with small-range electric weight, electric current and measurement of power loss, the sampling resistor value of unique difference between SENSE+ and SENSE-is different, and what the wide range electrical measurement was used is the precision resistance of 10 milliohms.SENSE+ port input 5V voltage is as reference source and chip power.Switching between large small-range has utilized the sheet of chip U18 to select the switch of port and light coupling relay.At first enable the wide range circuit during signal input, namely draw high the AL/CC port and open the U21 switch, the beginning measuring process.When finding the measuring accuracy backlog demand, close the wide range circuit, enable the small-range circuit, namely open U17 and draw high AL/CC, with positive-negative-positive triode Q4 conducting.

As shown in Figure 8, the tension measuring circuit in the electrical parameter measuring module partly comprises voltage measurement chip U12, solid-state relay switch pio chip U13; The 69 resistance R 69, the 72 resistance R 72, the 73 resistance R 73, three slide rheostat R68, R70 and R71; Six capacitor C 47～C52; The 13 stabilivolt D13 and the 14 stabilivolt D14.

, 28 pin of chip U12 meet CONVST.

The LTC1858 voltage measurement chip of Linear Technology company is adopted in voltage measurement among Fig. 8.Chip internal reality is comprised of A/D and analog switch, the CH0 of input voltage by entering chip U12 after the bleeder circuit dividing potential drop～CH7 port.Wherein, CH0～CH3 is 5V and 10V small-range shelves, does not make dividing potential drop.In order to prevent that overvoltage from burning out chip, must add light coupling relay U13 and add the protection of 25V stabilivolt at signal input part.When voltage is inputted, at first carry out large range measuring, cross when precision and be changed to small-range when hanging down.

As shown in Figure 9, the holding circuit in the electrical parameter measuring module partly comprises two normally opened relay K1 and K2; The 66 resistance R 66 and the 67 resistance R 67; The 46 capacitor C 46; Two field effect transistor Q1 and Q2; Four stabilivolt D9, D10, D11 and D12; 6 measuring probe socket J7～J12; The second hummer RL2; 1 fuse F1.

In the holding circuit shown in Figure 9, J9 and J12 are the power measurement port, and J8 and J11 are electric current electrical measurement port, and J7 and J10 are the voltage measurement port.The port input end of voltage and current electrical measurement is through K1 and two normally opened relays of K2, and when the input of overvoltage or overcurrent occured, relay disconnected, and hummer RL2 reports to the police simultaneously.4 100V stabilivolt D9～D12 can with greater than the stabilized input voltage of 200V at 200V.In the present embodiment, holding circuit also provides fuse F1, and its fusing current is 10A.

As shown in figure 10, show/indicate with control circuit and comprise LCD MODULE U11; 16 resistance R 50～R65; Eight capacitor C 38～C45; The second diode D2, the 3rd light emitting diode D3, the 4th light emitting diode D4, the 5th light emitting diode D5 and the 6th light emitting diode D6; Five button K3～K7; Two ten needle socket P18 and P19; A battery BT2; The 8th inductance L 8; The 3rd triode Q3; A connector mouth J3; A single-pole double-throw switch (SPDT) QK1; A hummer RL1.

LCD liquid crystal screen module among Figure 10 selects Shenzhen to open up the LM6038FDW liquid crystal display of general little scientific and technological development company limited, four kinds of electrical parameter values that are used for that local display measurement arrives and communication pattern; The LED light emitting diode has been selected redgreenblue, is used to indicate the power supply status of instrument of the present invention; For can effectively guiding the correct control survey instrument of user.Four buttons of choice for use are as user's control inputs in the present embodiment.The soft switch of button one (K3) representative of consumer is controlled mouth, and button two (K4) represents communication pattern and selects mouth, and button three (K5) represents measurement parameter and selects mouth, and button four (K6) represents the hand range selection.

Claims

1. radio parameter measuring instrument is characterized in that: instrument internal mainly is comprised of with control module core control and communication module, power management module, electrical parameter measuring module and demonstration/indication; Wherein, core control comprises the core controller circuit, serial ports and usb communication circuit with communication module; Power management module is electric power management circuit; Electrical parameter measuring module comprises small-range electric weight, electric current and measurement of power loss circuit, wide range electric weight, electric current and measurement of power loss circuit, tension measuring circuit and holding circuit; Show/indication is to show/indication and control circuit with control module;

The core controller circuit comprises core main control chip U1, duplexer chip U2; The 38 resistance, the 39 resistance and the 40 resistance; 18 capacitor C 10, capacitor C 11, capacitor C 12, capacitor C 13, capacitor C 14, capacitor C 15, capacitor C 16, capacitor C 17, capacitor C 18, capacitor C 19, capacitor C 20, capacitor C 21, capacitor C 22, capacitor C 23, capacitor C 24, capacitor C 25, capacitor C 26, capacitor C 27; The 3rd inductance L 3, the 4th inductance L 4, the five inductance L 5, the 6th inductance L 6 and the 7th inductance L 7; The first crystal oscillator Y1, the second crystal oscillator Y2 and the 3rd crystal oscillator Y3; A radio-frequency antenna plug receptacle J4 and ten needle socket P15;

1 pin of ten needle socket P15 meets MCU_VCC, and 2 pin of P15,3 pin and 9 pin meet MCU_GND; 4 pin of ten needle socket P15 meet P2.7/C2D, 5 pin of ten needle socket P15 meet P0.2/XTAL1, and 6 pin of ten needle socket P15 meet RX-RS485, and 7 pin of ten needle socket P15 meet RST/C2CK, 8 pin of ten needle socket P15 meet TX-RS485, and 10 pin of ten needle socket P15 meet P1.0/AGND; 1 pin of radio-frequency antenna plug receptacle J4 connects an end of inductance L 6 and an end of capacitor C 21, and 2 pin of connection of antenna socket J4,3 pin, 4 pin and 5 pin meet RF_GND; Another termination RF_GND of capacitor C 21; One end of another termination capacitor C 17 of inductance L 6 and an end of capacitor C 22, another termination RF_GND of capacitor C 22; 5 pin of another termination duplexer chip U2 of capacitor C 17,4 pin of duplexer chip U2 connect 26 pin of core main control chip U1,6 pin of duplexer chip U2 connect 25 pin of core main control chip U1,3 pin of duplexer chip U2 connect an end of capacitor C 15,2 pin of duplexer chip U2 meet RF_GND, and 1 pin of duplexer chip U2 connects an end of capacitor C 23; One section and 18 pin of core main control chip U1 of another termination inductance L 7 of capacitor C 23; The other end of inductance L 7 connects 19 pin of core main control chip U1 and an end of capacitor C 27, another termination RF_GND of capacitor C 27; Another termination inductance L 3 of capacitor C 15; One end of another termination capacitor C 16 of inductance L 3 and an end of inductance L 4, another termination RF_GND of capacitor C 16; One end of inductance L 4 another termination capacitor C 14 and an end of capacitor C 20 and an end of inductance L 5; The other end of another termination inductance L 5 of capacitor C 20 and an end of resistance R 40, another termination RF_GND of resistance R 40; The other end of inductance C14 connects 17 pin of core main control chip U1 and an end of inductance L 2; One end of one end of another termination capacitor C 12 of inductance L 2, an end of capacitor C 13, capacitor C 10 and an end of capacitor C 11, and be connected with RF_VCC with 16 pin of core main control chip U1; The other end that the other end of the other end of the other end of capacitor C 12, capacitor C 13, capacitor C 10 is connected with capacitor C all connects RF_GND; 15 pin of core main control chip U1 meet P2.6; 43 pin of core main control chip U1 meet RF_GND, 23 pin of core main control chip U1 meet RF_GND, 24 pin of core main control chip U1 connect 2 pin of crystal oscillator Y3,27 pin of core main control chip U1 connect an end of capacitor C 24 and an end of capacitor C 26,28 pin of core main control chip U1 meet an end and the RF_VCC of capacitor C 25,29 pin of core main control chip U1 meet P0.7/IREFO, 30 pin of core main control chip U1 meet P0.6/CNVSTR, 31 pin of core main control chip U1 meet P0.5/RX, 32 pin of core main control chip U1 meet P0.4/TX, 33 pin of core main control chip U1 meet P0.3/XTAL2,34 pin of core main control chip U1 meet P0.2/XTAL1,35 pin of core main control chip U1 meet P0.1/AGND, 43 pin of core main control chip U1 meet MCU_GND, 1 pin of crystal oscillator Y3 meets RF_GND, the other end of capacitor C 24, the other end that the other end of capacitor C 26 is connected with capacitor C all connects RF_GND; 1 pin of core main control chip U1 connects 1 pin of crystal oscillator Y2,2 pin of core main control chip U1 meet P2.5,3 pin of core main control chip U1 meet P2.4,4 pin of core main control chip U1 meet P2.3,5 pin of core main control chip U1 meet P2.2,6 pin of core main control chip U1 meet P2.1,7 pin of core main control chip U1 meet P2.0,8 pin of core main control chip U1 meet P1.7,9 pin of core main control chip U1 meet P1.6, and 10 pin of core main control chip U1 meet P1.5, the 11 pin connecting resistance R38 of core main control chip U1,12 pin of core main control chip U1 connect 1 pin of crystal oscillator Y1, and 13 pin of core main control chip U1 connect 3 pin of crystal oscillator Y1; 2 pin of crystal oscillator Y1 with are connected pin and all connect RF_GND; 2 pin of crystal oscillator Y2 connect 42 pin of core main control chip U1; 41 pin of core main control chip U1 meet P2.6,40 pin of core main control chip U1 meet P2.7/C2D, the end of the 39 pin connecting resistance R39 of core main control chip U1,38 pin of core main control chip U1 connect with an end of capacitor C 18, an end of capacitor C 19 and are connected with MCU_VCC, 37 pin of core main control chip U1 meet MCU_GND, and 36 pin of core main control chip U1 meet P0.0/VREF; The other end that capacitor C 18 is connected with capacitor C all connects MCU_GND; Described core main control chip U1 model is SI1000, and duplexer chip U2 model is UPG2214TB6SM;

Serial ports and usb communication circuit comprise USB interface conversion chip U8, RS232 serial ports transceiving chip U9, demultiplexing device bus switch U10; Resistance R 44, resistance R 45, resistance R 46, resistance R 47 resistance R 48, resistance R 49; Capacitor C 28, capacitor C 29, capacitor C 30, capacitor C 31, capacitor C 32, capacitor C 33, capacitor C 34, capacitor C 35, capacitor C 36, capacitor C 37; USB plug receptacle J5, serial ports plug receptacle J6; Two three needle socket P16 and three needle socket P17; Two light emitting diode D7 and light emitting diode D8;

16 pin of RS232 serial ports transceiving chip U9 connect an end of MCU_VCC and capacitor C 32, another termination MCU_GND of capacitor C 32; 2 pin of RS232 serial ports transceiving chip U9 connect capacitor C 33, another termination MCU_GND of capacitor C 33; 14 pin of RS232 serial ports transceiving chip U9 meet RS233RXD, and 13 pin of RS232 serial ports transceiving chip U9 meet RS233TXD, and 6 pin of RS232 serial ports transceiving chip U9 connect an end of capacitor C 37, another termination MCU_GND of capacitor C 37; 1 pin of RS232 serial ports transceiving chip U9 connects an end of capacitor C 29,3 pin of another termination RS232 serial ports transceiving chip U9 of capacitor C 29; 4 pin of RS232 serial ports transceiving chip U9 connect an end of capacitor C 34,5 pin of another termination RS232 serial ports transceiving chip U9 of capacitor C 34; 11 pin of RS232 serial ports transceiving chip U9 meet CMOS_TXD, and 12 pin of RS232 serial ports transceiving chip U9 meet CMOS_RXD, and 15 pin of RS232 serial ports transceiving chip U9 meet MCU_GND; 2 pin of serial ports plug receptacle J6 meet RS233RXD, and 3 pin of serial ports plug receptacle J6 meet RS233TXD, and 5 pin of serial ports plug receptacle J6,10 pin and the pin of being connected all connect MCU_GND; 6 pin of USB plug receptacle J5 meet MCU_GND; 1 pin of USB plug receptacle J5 connects an end of capacitor C 30 and an end of resistance R 46, another termination MCU_GND of capacitor C 30, the other end of resistance R 46 is connected another termination MCU_GND of capacitor C 31 with an end of capacitor C 31,3 pin of USB_VCC, three needle socket P16 and 20 pin of USB interface conversion chip U8; 2 pin of socket P16 are connected with an end of 4 pin, MCU_VCC and the capacitor C 28 of USB interface conversion chip U8, and another termination MCU_GND of capacitor C 28,1 pin of socket P16 connect 17 pin of U8 and an end of capacitor C 36, another termination MCU_GND of capacitor C 36; The end of the 2 pin connecting resistance R47 of USB plug receptacle J5,16 pin of another termination U8 of resistance R 47; The end of the 3 pin connecting resistance R48 of USB plug receptacle J5,15 pin of another termination U8 of resistance R 48; 4 pin, 5 pin of USB plug receptacle J5 meet MCU_GND; The two ends of capacitor C 35 meet respectively MCU_VCC and MCU_GND; 1 pin of USB interface conversion chip U8 meets USB_TXD, 5 pin of USB interface conversion chip U8 meet USB_RXD, the negative pole of the 23 pin sending and receiving optical diode D7 of USB interface conversion chip U8, the end of the anodal connecting resistance R44 of light emitting diode D7, another termination USB_VCC of resistance R 44; The negative pole of the 22 pin sending and receiving optical diode D8 of USB interface conversion chip U8, the end of the anodal connecting resistance R45 of light emitting diode D8, another termination USB_VCC of resistance R 45; 25 pin of USB interface conversion chip U8,18 pin, 21 pin, 7 pin are drunk 6 pin and are all connected MCU_GND; 1 pin of demultiplexing device bus switch U10 meets S, 2 pin of demultiplexing device bus switch U10 meet USB_RXD, 3 pin of demultiplexing device bus switch U10 meet CMOS_TXD, 4 pin of demultiplexing device bus switch U10 meet P0.4/TX, 5 pin of demultiplexing device bus switch U10 meet USB_TXD, 6 pin of demultiplexing device bus switch U10 meet CMOS_RXD, 7 pin of demultiplexing device bus switch U10 meet P0.5/RX, 8 pin of demultiplexing device bus switch U10 meet MCU_GND, 16 pin of demultiplexing device bus switch U10 meet MCU_VCC, and 15 pin of demultiplexing device bus switch U10 meet MCU_GND; 1 pin of three needle socket P17 meets MCU_GND, 2 pin of three needle socket P17 meet S, the 3 pin connecting resistance R49 of three needle socket P17, another termination MCU_VCC of resistance R 49, described USB interface conversion chip U8 model is FT232R, RS232 serial ports transceiving chip U9 model is MAX3232CSE, and demultiplexing device bus switch U10 model is FST3257;

Electric power management circuit comprises power management chip U3, digital control simulant electronic switch chip U4; 36 resistance R 1～R8, R10～R37, a slide resistor R9, a thermistor NTH1; Nine capacitor C 1～C9; The first inductance L 1 and the second inductance L 2; A light emitting diode D1; A battery BT1; A connector mouth J1 and a Mini USB interface J2;

No. 1 port of MiniUSB interface J2 is connected 20 pins with an end of an end of an end of an end of power supply, capacitor C 5, resistance R 4, capacitor C 3 respectively and is connected with power management chip U3; 2 pin of MiniUSB interface J2 meet RX-2, and 3 pin of MiniUSB interface J2 meet TX-2, and 4 pin of MiniUSB interface J2 connect respectively the other end of capacitor C 5 and ground connection; The end of the other end connecting resistance R6 of resistance R 4 and 17 pins of power management chip U3, the other end ground connection of capacitor C 3; The end of another termination thermistor NTH1 of resistance R 6, the other end ground connection of thermistor NTH1; The end of the 19 pin connecting resistance R8 of power management chip U3, another termination 3V-VCC-1 of resistance R 8; The end of the 18 pin connecting resistance R10 of power management chip U3, the other end ground connection of resistance R 10; The 12 pin ground connection of power management chip U3, No. 16 of power management chip U3 and 3 pin meet 3V-VCC-1, and 15 pin of power management chip U3 meet EN2, and 3V-VCC-1 meets BAT, No. 1 and the 21 pin ground connection of power management chip U3; 2,7,8 pin of power management chip U3 connect respectively an end of capacitor C 4, an end of resistance R 3, the positive pole of battery BT1, an end of another termination capacitor C 1 of resistance R 3, the other end ground connection of capacitor C 1, the other end ground connection of capacitor C 4, the minus earth of battery BT1; 6 pin of power management chip U3 connect an end of inductance L 1, and the other end of inductance L 1 is the end of connecting resistance R5 respectively, an end of capacitor C 6, and an end of capacitor C 7, and meet 3V-VCC-1, the other end ground connection of capacitor C 7; The end of the 4 pin connecting resistance R7 of power management chip U3, the other end of resistance R 5, and the other end of capacitor C 6, the end of another termination slide rheostat R9 of resistance R 7, the other end ground connection of slide rheostat R9; 9 pin of power management chip U3 connect an end of inductance L 2, and the other end of inductance L 2 links to each other with 10 pin of power management chip U3; 11 pin of power management chip U3 are the end of connecting resistance R11 respectively, 5V-VCC-1, an end of capacitor C 8, and VOUT2, the other end ground connection of capacitor C 8; The other end of the 13 pin connecting resistance R11 of power management chip U3, an end of resistance R 12, an end of another termination capacitor C 9 of resistance R 12, the other end of capacitor C 9 links to each other with 14 pin of power management chip U3; The 6 pin ground connection of digital control simulant electronic switch chip U4; The end of the 11 pin connecting resistance R18 of digital control simulant electronic switch chip U4 and A end, another termination 3V-VCC-1 of resistance R 18; The end of the 10 pin connecting resistance R19 of digital control simulant electronic switch chip U4 and B end, another termination 3V-VCC-1 of resistance R 19; The end of the 9 pin connecting resistance R20 of digital control simulant electronic switch chip U4 and C end, another termination 3V-VCC-1 of resistance R 20; The end of the 13 pin connecting resistance R23 of digital control simulant electronic switch chip U4, the end of the other end connecting resistance R22 of resistance R 23, the other end ground connection of resistance R 22; The end of the 14 pin connecting resistance R25 of digital control simulant electronic switch chip U4, the end of the other end connecting resistance R24 of resistance R 25, the other end ground connection of resistance R 24; The end of the 15 pin connecting resistance R27 of digital control simulant electronic switch chip U4, the end of the other end connecting resistance R26 of resistance R 27, the other end ground connection of resistance R 26; The end of the 12 pin connecting resistance R29 of digital control simulant electronic switch chip U4, the end of the other end connecting resistance R28 of resistance R 29, the other end ground connection of resistance R 28; The end of the 1 pin connecting resistance R31 of digital control simulant electronic switch chip U4, the end of the other end connecting resistance R30 of resistance R 31, the other end ground connection of resistance R 30; The end of the 5 pin connecting resistance R33 of digital control simulant electronic switch chip U4, the end of the other end connecting resistance R32 of resistance R 33, the other end ground connection of resistance R 32; The end of the 2 pin connecting resistance R35 of digital control simulant electronic switch chip U4, the end of the other end connecting resistance R34 of resistance R 35, the other end ground connection of resistance R 34; 7, the 8 pin ground connection of digital control simulant electronic switch chip U4; 3 pin of digital control simulant electronic switch chip U4 meet FB2, and 16 pin of digital control simulant electronic switch chip U4 meet 3V-VCC-1; One termination 3V-VCC-1 of resistance R 21, the end of other end sending and receiving optical diode D1, the other end ground connection of light emitting diode D1; Described power management chip U3 model is LTC3558, and digital control simulant electronic switch chip U4 model is CD4051BCN;

Small-range electric weight, electric current and measurement of power loss circuit comprise electrical measurement chip U14, three light coupling relay switch chip U15, U16 and U17; Six resistance R 74～R79; The 4th triode Q4 and the 5th triode Q5; Five needle socket P20, two ten needle socket P21 and P22;

5 pin of electrical measurement chip U14 connect 2 pin of ten needle socket P22, and 4 pin of electrical measurement chip U14 connect 6 pin of ten needle socket P22, and 3 pin of electrical measurement chip U14 connect 10 pin of ten needle socket P22; 1 pin of 1 pin of electrical measurement chip U14 and five needle socket P20, an end of the collector of triode Q4 and resistance R 74 is connected; 6 pin of electrical measurement chip U14 are connected with 6 pin, 4 pin, 6 pin of light coupling relay switch chip U17,4 pin of light coupling relay switch chip U17 and the other end of resistance R 74 of light coupling relay switch chip U15; The emitter of triode Q4 meets power supply 5V_VCC_1, the end of the base stage connecting resistance R78 of triode Q4, the collector of another termination triode Q5 of resistance R 78, the emitter of triode Q5 connects digitally DGND_2, the end of the base stage connecting resistance R79 of triode Q5, the other end of resistance R 79 connects 1 pin of ten needle socket P21; 5 pin of light coupling relay switch chip U17 connect 2 pin of five needle socket P20,1 pin of light coupling relay switch chip U17 connects 3 pin of ten needle socket P21, the end of the 2 pin connecting resistance R77 of light coupling relay switch chip U17, the other end of resistance R 77 connects digitally DGND_2; 5 pin of light coupling relay switch chip U15 meet VOUT2, and 1 pin of light coupling relay switch chip U15 is connected with 5 pin of 1 pin of chip U16 with ten needle socket P21; The end of the 2 pin connecting resistance R75 of light coupling relay switch chip U15, the other end of resistance R 75 connects digitally DGND_2; The 2 pin connecting resistance R76 of light coupling relay switch chip U16,6 pin and 4 pin of light coupling relay switch chip U16 meet Ptest-, and 5 pin of light coupling relay switch chip U16 connect digitally DGND_2, and the other end of resistance R 76 connects digitally DGND_2; 5 pin of five needle socket P20 connect digitally DGND_2; 10 pin of ten needle socket P21 connect digitally DGND_2; 1 pin of ten needle socket P22,3 pin, 7 pin, 4 pin and the pin of being connected all connect digitally DGND_2; Described electrical measurement chip U14 model is LTC2942, and three light coupling relay switch chip U15, U16 and U17 model are G3VM-21HR;

Wide range electric weight, electric current and measurement of power loss circuit comprise electrical measurement chip U18, three light coupling relay switch chip U19, U20 and U21; Five resistance R 80～R84; Five needle socket P23, two ten needle socket P24 and P25;

5 pin of electrical measurement chip U18 connect 2 pin of ten needle socket P25, and 4 pin of electrical measurement chip U18 connect 6 pin of ten needle socket P25, and 3 pin of electrical measurement chip U18 connect 10 pin of ten needle socket P25; 1 pin of electrical measurement chip U18 is connected another termination power 5V_VCC_2 of resistance R 80 with 1 pin of five needle socket P23, an end of resistance R 80 and an end of resistance R 81; 6 pin of electrical measurement chip U18 are connected with 6 pin of light coupling relay switch chip U19,4 pin of light coupling relay switch chip U19,6 pin of light coupling relay switch chip U21,4 pin of light coupling relay switch chip U21 and the other end of resistance R 81; 5 pin of light coupling relay switch chip U21 connect 2 pin of five needle socket P23,1 pin of light coupling relay switch chip U21 connects 3 pin of ten needle socket P24, the end of the 2 pin connecting resistance R84 of light coupling relay switch chip U21, the other end of resistance R 84 connects digitally DGND_4; 5 pin of light coupling relay switch chip U19 meet VOUT3, and 1 pin of light coupling relay switch chip U19 is connected with 5 pin of 1 pin of chip U20 with ten needle socket P24; The end of the 2 pin connecting resistance R82 of light coupling relay switch chip U19, the other end of resistance R 82 connects digitally DGND_4; The 2 pin connecting resistance R83 of light coupling relay switch chip U20,6 pin and 4 pin of light coupling relay switch chip U20 meet Ptest2-, and 5 pin of light coupling relay switch chip U20 connect digitally DGND_4, and the other end of resistance R 83 connects digitally DGND_4; 5 pin of five needle socket P23 connect digitally DGND_4; 10 pin of ten needle socket P24 connect digitally DGND_4; 1 pin of ten needle socket P25,3 pin, 7 pin, 4 pin and the pin of being connected all connect digitally DGND_4; Described electrical measurement chip U18 model is LTC2942, and three light coupling relay switch chip U19, U20 and U21 model are G3VM-21HR;

Tension measuring circuit comprises voltage measurement chip U12, solid-state relay switch pio chip U13; The 69 resistance R 69, the 72 resistance R 72, the 73 resistance R 73, three slide rheostat R68, R70 and R71; Six capacitor C 47～C52; The 13 stabilivolt D13 and the 14 stabilivolt D14;

The end of the 8 pin connecting resistance R73 of solid-state relay switch pio chip U13,7 pin of solid-state relay switch pio chip U13 connect the negative pole of diode D13, and 6 pin of solid-state relay switch pio chip U13 connect the end of slide rheostat R70; 5 pin of solid-state relay switch pio chip U13 are connected with 3 pin of the negative pole of stabilivolt D14, voltage measurement chip U12,5 pin of voltage measurement chip U12,7 pin of voltage measurement chip U12 and 9 pin of chip U12; 2 pin of solid-state relay switch pio chip U13 with are connected pin and connect digitally DGND_4,1 pin of solid-state relay switch pio chip U13 meets Low_span+, 3 pin of solid-state relay switch pio chip U13 meet Low_span-; The positive pole of stabilivolt D13 connects the positive pole of stabilivolt D14, the end of another termination slide rheostat R71 of resistance R 73,6 pin of another termination voltage measurement chip U12 of slide rheostat R71 and an end of resistance R 72, the end of another termination slide rheostat R68 of resistance R 72,8 pin of another termination voltage measurement chip U12 of slide rheostat R68 and an end of resistance R 69, the end of another termination slide rheostat R70 of resistance R 69, another termination Vin-of slide rheostat R70; 1 pin of voltage measurement chip U12,14 pin, 17 pin and 18 pin meet simulation ground AGND_4; 10 pin of voltage measurement chip U12 connect 12 pin of voltage measurement chip U12, and 11 pin of voltage measurement chip U12 connect 13 pin of voltage measurement chip U12; 15 pin of voltage measurement chip U12 connect an end of capacitor C 50, another termination simulation ground AGND_4 of capacitor C 50; 16 pin of voltage measurement chip U12 connect an end of capacitor C 51 and an end of capacitor C 52, another termination simulation ground AGND_4 of the other end of capacitor C 51 and capacitor C 52; 19 pin of voltage measurement chip U12 connect with 20 pin of voltage measurement chip U12, an end of capacitor C 49, an end of capacitor C 47 and are connected with power supply 5V_VCC_2, another termination simulation ground AGND_4 of the other end of capacitor C 49 and capacitor C 47; 21 pin of voltage measurement chip U12 meet an end and the power supply 3V _ VCC_2 of capacitor C 48, another termination simulation ground AGND_4 of capacitor C 48; 22 pin of voltage measurement chip U12 connect

Figure 2012105244766100001DEST_PATH_IMAGE002

, 23 pin of voltage measurement chip U12 meet SDO_4, and 24 pin of voltage measurement chip U12 connect digitally DGND_4, and 25 pin of voltage measurement chip U12 meet SDI_4, and 26 pin of voltage measurement chip U12 meet SCK_4, and 27 pin of voltage measurement chip U12 connect

Figure 2012105244766100001DEST_PATH_IMAGE004

, 28 pin of voltage measurement chip U12 meet CONVST, and described voltage measurement chip U12 model is LTC1858, and solid-state relay switch pio chip U13 model is KAQW214S;

Holding circuit comprises two normally opened relay K1 and K2; The 66 resistance R 66 and the 67 resistance R 67; The 46 capacitor C 46; Two field effect transistor Q1 and Q2; Four stabilivolt D9, D10, D11 and D12; 6 measuring probe socket J7～J12; The second hummer RL2; 1 fuse F1;

1 pin of relay normally open contact K2 meets probe socket J7,3 pin of relay normally open contact K2 meet probe socket J10,5 pin of relay normally open contact K2 connect digitally DGND_2,2 pin of relay normally open contact K2 connect the negative pole of stabilivolt D9,4 pin of relay normally open contact K2 connect the negative pole of stabilivolt D12, the end of the 6 pin connecting resistance R67 of relay normally open contact K2 and the end of hummer RL2; Another termination power 5V_VCC_1 of resistance R 67, the drain electrode of another termination field effect transistor Q2 of hummer RL2, the source electrode of field effect transistor Q2 connects digitally DGND_2, and the grid of field effect transistor Q2 connects the grid of field effect transistor Q1; 1 pin of relay normally open contact K1 meets probe socket J8, the 3 pin plug receptacle J11 of relay normally open contact K1,5 pin of relay normally open contact K1 connect digitally DGND_2, and 1 pin of relay normally open contact K1 connects the end of fuse F1, another termination Iin2+ of fuse F1; 6 pin of relay normally open contact K1 connect the drain electrode of field effect transistor Q1 and an end of resistance R 66, another termination 5V_VCC_1 of resistance R 66, and the source electrode of field effect transistor Q1 connects digitally DGND_2; The positive pole of stabilivolt D9 connects the negative pole of stabilivolt D10, and the positive pole of stabilivolt D10 connects the positive pole of stabilivolt D11, and the negative pole of stabilivolt D11 connects the positive pole of stabilivolt D12; Probe socket J7 connects an end of capacitor C 46, and the other end of capacitor C 46 is connected with probe interface J10; Probe interface J9 meets Ptest+, and probe interface J12 meets Ptest-;

Show/indicate with control circuit and comprise LCD MODULE U11; 16 resistance R 50～R65; Eight capacitor C 38～C45; The second diode D2, the 3rd light emitting diode D3, the 4th light emitting diode D4, the 5th light emitting diode D5 and the 6th light emitting diode D6; Five button K3～K7; Two ten needle socket P18 and P19; A battery BT2; The 8th inductance L 8; The 3rd triode Q3; A connector mouth J3; A single-pole double-throw switch (SPDT) QK1; A hummer RL1;

1 pin of LCD MODULE U11 meets AL/CC4_1, and 2 pin of LCD MODULE U11 meet LCD_P1, and 3 pin of LCD MODULE U11 meet LCD_P2, and 14 pin of LCD MODULE U11 meet 3V3, and 15 pin of LCD MODULE U11 connect digitally DGND_3; The end of the 16 pin connecting resistance R50 of LCD MODULE U11 and the collector of triode Q3, another termination 3V3 of resistance R 50, the base stage of triode Q3 meets LCD_P3, and emitter connects digitally DGND_3; 12 pin of LCD MODULE U11 meet SCL_3, and 13 pin of LCD MODULE U11 meet SDA_3; 1 pin of ten needle socket P18,3 pin, 4 pin, 7 pin and the pin of being connected connect digitally DGND_3, and 5 pin and 7 pin of ten needle socket P18 meet 3V_VCC_4; 1 pin of ten needle socket P19 meets LCD_P1,3 pin of ten needle socket P19 meet LCD_P2,5 pin of ten needle socket P19 meet LCD_P3,7 pin of ten needle socket P19 meet KEY_P1,9 pin of ten needle socket P19 meet KEY_P3,2 pin of ten needle socket P19 meet KEY_P2, and 4 pin of ten needle socket P19 meet LCD_P4, and 6 pin of ten needle socket P19,8 pin and the pin of being connected connect digitally DGND_3; The end of KEY_P1 connecting resistance R52, the other end of resistance R 52 is connected with 4 pin with an end of resistance R 51, an end of capacitor C 38 and 1 pin of button K3; Another termination 3V3 of resistance R 51, the other end of capacitor C 38 connects digitally DGND_3,2 pin of button K3 with are connected pin and connect digitally DGND_3; The end of KEY_P2 connecting resistance R54, the other end of resistance R 54 is connected with 4 pin with an end of resistance R 53, an end of capacitor C 39 and 1 pin of button K4; Another termination 3V3 of resistance R 53, the other end of capacitor C 39 connects digitally DGND_3,2 pin of button K4 with are connected pin and connect digitally DGND_3; The end of KEY_P3 connecting resistance R56, the other end of resistance R 56 is connected with 4 pin with an end of resistance R 55, an end of capacitor C 40 and 1 pin of button K5; Another termination 3V3 of resistance R 55, the other end of capacitor C 40 connects digitally DGND_3,2 pin of button K5 with are connected pin and connect digitally DGND_3; The end of KEY_P4 connecting resistance R58, the other end of resistance R 58 is connected with 4 pin with an end of resistance R 57, an end of capacitor C 41 and 1 pin of button K6; Another termination 3V3 of resistance R 57, the other end of capacitor C 41 connects digitally DGND_3,2 pin of button K6 with are connected pin and connect digitally DGND_3; The end of P0.6/CNVSTR connecting resistance R64, the end of the other end sending and receiving optical diode D5 of resistance R 64, another termination MCU_GND of light emitting diode D5; The end of P2.5 connecting resistance R63, the end of the other end sending and receiving light diode D4 of resistance R 63, another termination MCU_GND of light emitting diode D4; The end of P1.7 connecting resistance R62, the end of the other end sending and receiving light diode D3 of resistance R 62, another termination MCU_GND of light emitting diode D3; The end of P0.2/XTAL1 connecting resistance R60,1 pin and 4 pin of an end of the other end of resistance R 60 and resistance R 59, an end of capacitor C 44 and button K7; Another termination MCU_VCC of resistance R 59, another termination MCU_GND of capacitor C 44,2 pin and 3 pin of button K1 meet MCU_GND; P0.3/XTAL2 connects the positive pole of electrochemical capacitor C45, and the negative pole of electrochemical capacitor C45 connects the end of hummer RL1, the end of the other end connecting resistance R65 of hummer RL1, another termination MCU_GND of resistance R 65; One end of capacitor C 42 is connected with an end of BATT_IN and inductance L 8 respectively; Another termination MCU_GND of capacitor C 42; Another termination capacitor C 43 and MCU_VCC of inductance L 8, another termination MCU_GND of capacitor C 43; One termination MCU_VCC of resistance R 61, the positive pole of the other end sending and receiving optical diode D6 of resistance R 61, the negative pole of light emitting diode D6 meets MCU_GND; 2 pin of connector mouth J3 with are connected pin and connect MCU_GND, 2 pin of the 1 pin order double-pole double throw switch QK1 of connector mouth J3; 1 pin of single-pole double-throw switch (SPDT) QK1 meets BATT_IN, 2 pin of single-pole double-throw switch (SPDT) QK1 also link to each other with the negative pole of diode D2, the positive pole of diode D2 connects 2 pin of battery BT2, and 1 pin of battery BT2 meets MCU_GND, and described LCD MODULE U11 model is LM6038FDW.