CN100498261C - Combined type digital pressure calibration instrument - Google Patents
Combined type digital pressure calibration instrument Download PDFInfo
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- CN100498261C CN100498261C CNB2007101578926A CN200710157892A CN100498261C CN 100498261 C CN100498261 C CN 100498261C CN B2007101578926 A CNB2007101578926 A CN B2007101578926A CN 200710157892 A CN200710157892 A CN 200710157892A CN 100498261 C CN100498261 C CN 100498261C
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Abstract
Combined digital pressure prover is made up of hardware and software. The hardware includes the controller, self-controlled pressure leaking protecting solenoid valve. The software is made up of the self-checking subprogram, checking subprogram, the data processing subprogram and display subprogram; the controller includes the main processor unit, the A/D switching unit, the display and alarm unit, multipath simulating unit and power supplying unit; the output signal of pressure module is transformed to the multipath simulating unit U6 through the current input interface P2, the output of slug U6 is transformed to the A/D switching slug U2, then to the SCM slug U1 to process and display and the U1 can control the pressure exceeding-leaking protecting solenoid valve to start and close. The invention has the scientific designation, high verifying precision, wide range, safe process, compact whole structure, complete function, simple operation, stable character and high practicability. The invention is proper for the standard of magnitude transformation or verification of manometer and pressure sensor.
Description
Technical field
What the present invention relates to is pressure calibration instrument, particularly precision height, broad quantum, function combined type digital pressure calibration instrument device how.
Background technology
All departments, constituent parts nearly all need the working pressure table, the pressure of equipment relates to the safety of the person and equipment, it is especially important that manometric effect seems, therefore the authorised pressure table belongs to the measurement instrument of compulsory verification, need be higher than by the standard utensil of 3 times of test examination instruments with precision by a kind of instrument of rules requirement calibrating and carry out verification, comparison.
Standard utensil for tensimeter and pressure transducer calibrating usefulness is roughly counterweight and master gauge, though the counterweight precision is higher, yet it is too heavy, check repeatedly in the verification process, use counterweight just inconvenient naturally, observe also not too intuitively when utilizing weight detecting, it is also not too convenient to preserve at ordinary times.Master gauge is easy to use, however the calibrated meter range differ, need with a lot of tables that are equipped with, in the verification slightly carelessness can cause and transfinite and the failure criteria table, master gauge mostly be a mechanical drive, the long-time use can be because of the reduction of wearing and tearing precision.Be that counterweight or master gauge all need and the supporting use of pressure test device, move down that the heavy of calibration equipment brings certain degree of difficulty again for calibration operation as if arriving field-checking, bringing up to.
Also do not have the outrange protection at present, be easy to use, the precision height, broad quantum, data presentation is the digital pressure reference instrument clearly.
Summary of the invention
The objective of the invention is at present also less than the precision height, easy to usely have the normal pressure tester of outrange protection and a kind of protection of transfiniting that has is provided, the precision height, pressure limit is wide, multifunctional combined digital pressure calibration instrument.
The technical scheme that adopts is:
Combined type digital pressure calibration instrument is made up of hardware and software two parts.
Described hardware comprises cabinet and is installed in cabinet interior controller, connecting pipe, decompression protection solenoid valve, modular pressure; Be equiped with power switch, LCDs, brightness button, pressure limit pilot lamp, the low pilot lamp of cell voltage, a plurality of pressure access plug on the front panel of described cabinet; Wherein parts such as power switch, LCDs, brightness button, pressure limit pilot lamp, the low pilot lamp of cell voltage are connected with the controller corresponding end respectively by lead; A plurality of pressure insert plug and are connected with the high precision standard modular pressure by the connecting pipe that is arranged in the cabinet; The user is input to pressure the internal pressure module simultaneously by the hand-held forcing pump and is calibrated on the equipment, makes the user learn the size of institute's input pressure and be calibrated the electric current that equipment feeds back by LCD screen, thereby reaches the purpose of calibration equipment.
The cabinet rear panel is provided with lead-out terminal and the reset button K and the battery charging process pilot lamp LED3 of a pair of 24V direct supply.
Described controller comprises primary processor selected cell, A/D converting unit, demonstration and alarm unit, multiway analog switch unit, power supply unit;
Described primary processor selected cell comprises chip U1, crystal oscillator X1, touch switch input interface P1; Chip U1 is a singlechip chip, 2-8 pin of touch switch input interface P1 are corresponding respectively to be connected with 7-1 pin of chip U1, the corresponding respectively end that connects measuring resistance row RP1 of 7-1 pin of chip U1, the other end of measuring resistance row RP1 connects+5V jointly, 19,18 pin of chip U1 connect the two ends of crystal oscillator X1 respectively, capacitor C 1, each end of C2 are connected to the two ends of crystal oscillator X1, capacitor C 1, each other end serial connection back ground connection of C2; 9 pin of chip U1 are connected with capacitor C 3 one ends, the other end of capacitor C 3 connects an end of resistance R 1, the other end ground connection of resistance R 1, and diode D1 is attempted by the two ends of resistance R 1, the plus earth of diode D1, the two ends of capacitor C 3 are connected on the reset button K on the rear panel by a twisted-pair feeder;
Described A/D converting unit comprises chip U2, U3, U4, U5 (A) and U5 (B), crystal oscillator X2, diode D2; 1 pin of chip U2 links to each other with 5 pin of chip U3, the 1 pin connection+5V of chip U3,2 pin of chip U3 are connected the two ends of capacitor C 4 with 4 pin, the 3 pin ground connection of chip U3,5 pin of chip U3 connect an end of capacitor C 7, the other end ground connection of capacitor C 7,2 pin of chip U2 connect the middle slider end of potentiometer W1, the fixed resistance value end of potentiometer W1 connects capacitor C 8 simultaneously, the end of C9, and 3 pin of connection chip U4,1 pin of chip U4 and 3 pin short circuits, capacitor C 8,4 pin and the ground connection that connect chip U4 behind the other end short circuit of C9, another fixed resistance value end of potentiometer W1 connect 4 pin and the while ground connection of chip U4; 4 pin of chip U2 are connected with an end of capacitor C 12 and resistance R 6 through resistance R 5, capacitor C 11 simultaneously, and the other end of capacitor C 12 connects 5 pin of chip U2, and the other end of resistance R 6 connects 6 pin of chip U2, the 3 pin ground connection of chip U2; 4 pin of chip U2 are through the negative pole of the D2 of resistance R 4 connection diodes, and the positive pole of diode D2 connects 9 pin and the while ground connection of chip U2, and the 9 foot meridian capacitor C14 of chip U2 are connected with 10 pin of chip U2, and the 7 foot meridian capacitor C13 of chip U2 are connected with 8 pin of chip U2.
11 pin of chip U2 link to each other with 8 pin of chip U4 and are connected to+5V, 26 pin of chip U2 are connected with 13 pin of chip U1,25 pin of chip U2 are connected to 14 pin of chip U1,13 pin of chip U2 are connected to 21 pin of chip U1,14 pin of chip U2 are connected to 22 pin of chip U1,15 pin of chip U2 are connected to 23 pin of chip U1, and 16 pin of chip U2 are connected to 24 pin of chip U1;
22 pin of chip U2 connect the output terminal of phase inverter chip U5 (B), the input end of phase inverter chip U5 (B) is connected with the output terminal of phase inverter chip U5 (A), an end of resistance R 3, the end of crystal oscillator X2, an end of capacitor C 6 simultaneously, the other end of the input end of phase inverter chip U5 (A), the other end of resistance R 3, crystal oscillator X2, an end of capacitor C 5 link together simultaneously, and the other end of capacitor C 5 and C6 interconnects back ground connection.
Described demonstration and alarm unit comprise chip U6, two triode T4, T5, two light emitting diode LED1, LED2, liquid crystal interface P0; 16-9 pin of liquid crystal interface P0 are corresponding respectively to be connected with 32-39 pin of chip U1, ground connection behind 1 pin of liquid crystal interface P0 and the 3 pin short circuits, and 2 pin of liquid crystal interface P0 are connected+5V with 4 pin short circuits;
Chip U6 is the Sheffer stroke gate module chip that is provided with four two-way inputs in the sheet, the inside of chip U6 is provided with the module U6 (A) of the Sheffer stroke gate of four two-way inputs, U6 (B), U6 (C), U6 (D), 1 of chip U6, connect 28 pin of chip U1 behind the 2 pin short circuits, 4 pin of chip U6,16 pin of 5 pin difference correspondence and chip U1,17 pin connect, output terminal 3 pin of the Sheffer stroke gate module U6 (A) of chip U6 are connected with input end 9 pin of Sheffer stroke gate module U6 (C), output terminal 6 pin of Sheffer stroke gate module U6 (B) are connected with input end 10 pin of Sheffer stroke gate module U6 (C), output terminal 8 pin of Sheffer stroke gate module U6 (C) and input end 12 pin of Sheffer stroke gate module U6 (D), 13 pin are connected, and output terminal 11 pin of Sheffer stroke gate module U6 (D) are connected with 8 pin of liquid crystal interface P0;
The base stage of triode T4 is connected to 10 pin of chip U1 through resistance R 8, and the emitter of triode T4 is received+5V, and the collector of triode T4 is received the positive pole of LED 1 through resistance R 9; The negative pole of LED 1 links to each other with an end of the fixed resistance value end of potentiometer W2 and ground connection, and the other end of the fixed resistance value end of potentiometer W2 is connected to+5V, and the middle slider end of potentiometer W2 is connected to 5 pin of liquid crystal interface P0; The base stage of triode T5 is connected to 11 pin of chip U1 through resistance R 10, the emitter of triode T5 is connected with the emitter of triode T4 and connects jointly+5V, the collector of triode T5 is received the positive pole of LED 2 through resistance R 11, and the negative pole of LED 2 is connected with the negative pole of LED 1;
Described multiway analog switch unit comprises chip U7, current input terminal interface P2; 1-8 pin of current input terminal interface P2 are corresponding respectively to be connected with 13,14,15,12,1,5,2,4 pin of chip U7, corresponding end with measuring resistance row RP2 one side is connected respectively simultaneously, the corresponding end of measuring resistance row RP2 opposite side interconnects the back common ground that is connected with the negative pole of LED 1, LED2, ground connection behind 6 pin of chip U7, the 7 pin short circuits; The 8 pin ground connection of chip U7,16 pin of chip U7 are connected to+5V; 9,10,11 pin of chip U7 are corresponding respectively to be connected with 12,15,25 pin of chip U1, and 3 pin of chip U7 are connected to 10 pin of chip U2 through resistance R 7.
Described power supply unit comprises transformer TB, rectifier bridge module BG1, BG2, automatic voltage regulator module Q1, Q2, Q3, battery-powered assembly and battery charger; The secondary side of transformer TB is provided with 8V winding L 1 and 27V winding L 2; Winding L 1 two ends connect the input end of rectifier bridge module BG1, the output terminal of rectifier bridge module BG1 also meets an electrochemical capacitor C15 and high frequency capacitance C16, the forward output terminal of rectifier bridge module BG1 is connected to the input end of automatic voltage regulator module Q1, automatic voltage regulator module Q1, Q2, Q3 are three end automatic voltage regulators, promptly an input end and an earth terminal constitute input circuit, and an output terminal and same earth terminal constitute output loop; The negative sense output terminal of rectifier bridge module BG1 connects the earth terminal of automatic voltage regulator module Q1, and the output and ground of automatic voltage regulator module Q1 also meets capacitor C 17, C18, output terminal output+5V, earth terminal ground connection.
Winding L 2 two ends connect the input end of rectifier bridge module BG2, the output terminal of rectifier bridge module BG2 also meets an electrochemical capacitor C19 and high frequency capacitance C20, the forward output terminal of rectifier bridge module BG2 is connected to the input end of automatic voltage regulator module Q2, the negative sense output terminal of rectifier bridge module BG2 connects the earth terminal of automatic voltage regulator module Q2, between the output and ground of automatic voltage regulator module Q2 and connect capacitor C 21, C22, output terminal output 24V, the output terminal of automatic voltage regulator module Q2 also is connected the input end of automatic voltage regulator module Q3 simultaneously, between the output terminal of automatic voltage regulator module Q3 and the ground and connect capacitor C 23, C24, output terminal output 12V, earth terminal ground connection.
Described battery-powered assembly comprises chip U8, U9, and 1 pin of chip U8 connects positive pole and the inductance L 3 of diode D3 simultaneously, and the negative pole of diode D3 is connected on resistance R 16 and the capacitor C 27 interconnective end points, is attempted by+the 24V power output end; The other end of resistance R 16 connects 5 pin of chip U8 simultaneously, 5 pin of chip U8 connect an end of resistance R 17, the other end of resistance R 17 is divided into two-way, one the tunnel is connected with 6 pin of chip U8 through capacitor C 26, another road ground connection that links to each other with 4 pin of chip U8, the 3 foot meridian capacitor C25 ground connection of chip U8,8 pin of chip U8 link to each other with 7 pin of chip U8 through resistance R 15,7 pin of chip U8 also are connected jointly with the other end of inductance L 3, an end of resistance R 14, and the other end of resistance R 14 is received cell voltage 7.2V; 2 pin of chip U8 are connected with the base stage of triode T6, and the base stage of triode T6 is passed through base resistance R13 ground connection, the grounded emitter of triode T6, and the collector of triode T6 is connected to 1 pin of chip U8; The other end ground connection of capacitor C 27;
1 pin of chip U9 connects resistance R 19, the end of R20, be connected to simultaneously on 7 pin of the collector of triode T7 and chip U9, the other end of resistance R 19 is connected cell voltage 7.2V, the other end of resistance R 20 is connected 8 pin of chip U9,3 pin of chip U9 are connected with ground through capacitor C 28, the 4 pin ground connection of chip U9,2 pin of chip U9 are connected to the base stage of triode T7, the base stage of triode T7 is by resistance R 18 ground connection, the emitter of triode T7 connects the negative terminal of inductance L 4 and diode D4, the positive ending grounding of diode D4, the other end of inductance L 4 is received on resistance R 21 and the end points that capacitor C 30 is connected and is connected+the 5V power output end, the other end ground connection of capacitor C 30, and the other end of resistance R 21 is connected to 5 pin of chip U9,5 pin of chip U9 are through resistance R 22 ground connection, and 6 pin of chip U9 are by capacitor C 29 ground connection.
Described battery charger comprises current regulator diode D5, D6, D7, potentiometer W3, triode T8, T9, the LED 3 of charging process indication; The positive pole of the positive pole of current regulator diode D5 and LED 3 and capacitor C 31, one end of resistance R 12 links together, and with by power supply unit+12V is connected, the negative terminal of current regulator diode D5 is connected to an end of potentiometer W3 fixed resistance value end, the positive pole of another termination current regulator diode D6 of potentiometer W3 fixed resistance value end, the minus earth of current regulator diode D6, the middle slider end of potentiometer W3 is connected to the base stage of triode T8, the collector of triode T8 connects the negative pole of LED 3, link to each other with the other end of capacitor C 31 and the base stage of triode T9 simultaneously, the emitter of triode T8 links to each other with the positive pole of current regulator diode D7, the negative pole of current regulator diode D7 is connected the positive pole of battery E, the negative pole of battery E links to each other with the negative pole of current regulator diode D6 and ground connection, be connected with the collector of triode T9 simultaneously, the emitter of triode T9 connects on the other end of resistance R 12.
Described a plurality of decompression protection solenoid valve adopts commercially available finished parts; the input mouth of pipe of a plurality of decompression protection solenoid valves is corresponding respectively to be connected with a plurality of shunt valves; a plurality of shunt valves are installed in respectively on a plurality of connecting pipes; the output mouth of pipe of decompression protection solenoid valve is directly to atmosphere; a plurality of decompression protection solenoid valve separate connection; not connected; the control coil of decompression protection solenoid valve is corresponding respectively to be connected with the emitter of a plurality of triodes; the base stage of a plurality of triodes also connects; be connected with 8 pin of singlechip chip U1 through resistance R 2, control the open and close of multichannel solenoid valve by 8 pin of chip U1 simultaneously.
On a plurality of pressure access plugs, a plurality of finished parts microswitches are housed, the lead-in wire one end common ground of a plurality of microswitches, the other end is connected with the corresponding end pin of touch switch input interface P1, and microswitch is the current input terminal interface P2 which modular pressure is linked into controller in order to detection;
Described software section by the self check subroutine, detect subroutine, data processing subroutine, display subroutine etc. and form, finish the power-up initializing of peripheral components, self check, external interrupt, timer are set, and the result are presented at the first-class function of liquid crystal display.After instrument powers on, by a self-check program, judge the CPU part of instrument, the A/D chip, whether chip of LCD etc. are working properly, and show testing result on LCDs, if fault, demonstrate the device of problem on liquid crystal display; Self-check program is by a series of algorithm Authentication devices inside chip one by one.Detecting subroutine is to finish input pressure and the automatic detection that is calibrated device current, and the data processing subroutine is finished the conversion and the processing capacity of data, and display subroutine is presented at the result on the liquid crystal display.
Principle of work of the present invention:
To need the tensimeter of verification or pressure transducer to link together by connecting line and external hand-held forcing pump or pressure test device and this tester, with the 24V power supply of cabinet of the present invention back with by the corresponding connection of pressure transducer power input of verification, then simultaneously to being imported same pressure simultaneously by calibration equipment and combined type digital pressure calibration instrument of the present invention.
The pressure signal of verification inserts plug, connecting pipe, microswitch by the pressure of combined type digital pressure calibration instrument of the present invention; the touch switch input interface is added on the modular pressure, and pressure signal also is input to the decompression protection solenoid valve by pressure access plug, shunt valve simultaneously.Because of every road is equipped with a microswitch, microswitch action when meeting pressure signal, output switching value signal is imported chip U1 again to the touch switch input interface, and then judges a plurality of pressure insert where the road has added pressure signal in the plug.
Add pressure signal and be converted into the normalized current simulating signal of 4-20mA by modular pressure, current analog signal is imported by current input terminal interface P2, as shown in Figure 5, resistor chain RP2 by 100 ohm of standards is converted into 0.4-2V voltage analog signal and is input to chip U7 respectively, in fact multiway analog switch chip U7 plays the effect of a selector switch, analog voltage signal is by multiway analog switch chip U7, and by 25 pin of singlechip chip U1,15 pin, 11 pin of 12 pin output signal control chip U7,10 pin, 9 pin are to select one tunnel signal conveys accurately in A/D conversion chip U2, as shown in Figure 5.10 pin, 9 pin that analog voltage signal is input to A/D conversion chip U2 by 3 pin and the earth terminal of chip U7, A/D conversion back is input to 24 pin, 23 pin, 22 pin, 21 pin of singlechip chip U1 by 16 pin, 15 pin, 14 pin, 13 pin of chip U2; Must provide reference voltage for A/D conversion chip U2 for making the A/D conversion have high precision, chip U4 is the precision voltage reference chip.
28 pin of singlechip chip U1,17 pin, 16 pin output to 1 pin, 2 pin, 4 pin, 5 pin of chip U6, be transported to 8 pin of liquid crystal interface P0 through Sheffer stroke gate module U6 (A), U6 (B), U6 (C), the U6 (D) of four two-way input, to make the shows signal of LCD screen.
If pressure limit in the process of verification, just 10 pin of chip U1 can output signal amplify the LED 1 that is used for driving warning through triode T4; In the process of using the powered battery verification, if cell voltage is low excessively, just 11 pin of control chip U1 can output signal amplify the LED 2 that is used for driving warning through triode T5.
In this instrument, two kinds of power supply modes of Alternating Current Power Supply and powered battery have been adopted, Alternating Current Power Supply is formed electric main by transformer TB and two rectifier bridge module BG1 and BG2, three three terminal regulator module Q1, Q2, Q3 and some filter capacitors, with reference to accompanying drawing 6, be transformed to direct current 5V, direct current 24V and direct current 12V and supply with instrument itself respectively, be calibrated equipment and battery charge use.
Battery power supply system adopts jumbo Ni-MH battery and changes out 5V and two kinds of direct supplys of 24V, has adopted DC/DC converter technique commonly used, and chip U8, U9 are one chip DC/DC transducers, can finish functions such as DC boosting, step-down.
Principal feature of the present invention is the pressure input that seven tunnel different ranges are arranged, and almost is suitable for the most of tensimeter of use at present and the calibrating of pressure transducer; The precision height, error and variation are minimum, and the operation of up-downgoing is had no effect to checking data in the checking procedure; Integral protection of the present invention tightly is not subjected to outside electromagnetic interference, and volume is little, have high calibrating technical feature.Easy to maintenance, can directly change the modular pressure of damage, have the light warning prompt facility, quite cheap with the cost of comparing with other pressure criteria utensils of accuracy class, have very high cost performance.
The present invention is for fear of the modular pressure that damages lower range because of maloperation; adopted a kind of safety precautions especially on three modules of this instrument lower range---on pressure channel, added hypomegetic protection decompression protection solenoid valve; when input pressure surpasses the module tolerance range; solenoid valve is opened under the control of single-chip microcomputer automatically; pressure release; thereby can avoid artificial maloperation to make that input pressure is too high and damage the modular pressure of lower range, fundamentally having solved in the lower range pressure checking in the Measuring and testing specialty very easily transfinites and the problem of failure criteria device.
Change for the position that the present invention is adapted at any time, adopted battery and exchanged two kinds of power supply modes, and can automatically switch.Have cell voltage and cross low warning function, do not cause nonvolatil damage with regard to having avoided battery because do not charge for a long time like this.
The present invention adopts general LCDs, and has increased the white illumination of LED, can adapt to like this at environment to use in darker place or night.
Design science of the present invention, reasonable, original, checking precision is high, the broad quantum of verification, checking procedure have the safety assurance link, compact overall structure, tight, consumptive material is few, and is with low cost, verifying function is complete, simple and direct-viewing operation, the efficient height of verification, the present invention makes simply, stable performance, reliable, practicality is stronger, has development prospect preferably, and the present invention is suitable to be used as the upper level standard utensil of transmission of quantity value or the calibrating of tensimeter in the real work and pressure transducer.
Need to prove: under the prerequisite that does not change the principle of the invention and design, change of having done or distortion all belong to protection scope of the present invention.
Description of drawings
Fig. 1 is a cabinet surface structure synoptic diagram of the present invention.
Fig. 2 is the primary processor selected cell circuit diagram among the present invention.
Fig. 3 is the A/D conversion unit circuit figure among the present invention.
Fig. 4 is demonstration and the alarm unit circuit diagram among the present invention.
Fig. 5 is the multiway analog switch element circuit figure among the present invention.
Fig. 6 is the power supply unit circuit diagram among the present invention.
Fig. 7 is the battery feed circuit figure among the present invention.
Fig. 8 is the battery charger figure among the present invention.
Fig. 9 is the pressure input connection diagram among the present invention.
Figure 10 is that the present invention does not comprise that the circuit of power supply always schemes.
Embodiment
Embodiment
Combined type digital pressure calibration instrument is made up of hardware and general detection, display routine.Hardware comprises cabinet 1 and is installed in controller, decompression protection solenoid valve, current input terminal interface P2 in the cabinet 1; The front panel of cabinet 1 is provided with power switch 4, LCDs 2, brightness button 5, pressure limit pilot lamp LED1, the low pilot lamp LED2 of cell voltage, seven pressure access plugs 3, and its corresponding input range is respectively 7kpa, 70kpa, 100kpa, 700kpa, 3450kpa, 7000kpa, 10340kpa; Seven pressure insert plug 3 and are connected by connecting pipe 6 seven high precision normal pressure module U10-U16 corresponding respectively and in the cabinet, as shown in Figure 9.
The rear panel of cabinet 1 is provided with lead-out terminal and the reset button K and the battery charge pilot lamp LED3 of a pair of 24V direct supply.
Controller comprises primary processor selected cell, A/D converting unit, demonstration and alarm unit, multiway analog switch unit, power supply unit; The primary processor selected cell comprises chip U1, crystal oscillator X1, touch switch input interface P1; Chip U1 has selected for use the AT89C52 single-chip microcomputer of 8 comparatively general on the market machine 51 series as primary processor, and singlechip chip U1 contains inside the flash internal memory of 8K.
Touch switch input interface P
12-8 pin respectively corresponding with chip U
17-1 pin connect, the corresponding respectively end that connects measuring resistance row RP1 of 7-1 pin of chip U1, the other end of measuring resistance row RP1 connects+5V chip U jointly
119,18 pin connect crystal oscillator X respectively
1Two ends, capacitor C
1, C
2Other two ends after the serial connection are attempted by the two ends of crystal oscillator X1, capacitor C respectively
1, C
2Tie point ground connection; Chip U
19 pin and capacitor C
3One end connects, capacitor C
3The other end connect resistance R
1An end, resistance R
1Other end ground connection, diode D
1Be attempted by resistance R
1Two ends, diode D
1Plus earth, capacitor C
3Two ends be connected on the reset button K of cabinet rear panel by a twisted-pair feeder.
The A/D converting unit comprises chip U2, U3, U4, U5 (A) and U5 (B), crystal oscillator X2; It is the IC7135 chip that A/D conversion chip U2 adopts model, and it is a biproduct somatotype A/D converter, and high precision, resolution are positive and negative 1/20000, and digital quantity is-19999-+19999, is equivalent to 14 A/D converter;
Chip U3 has adopted special-purpose polarity transformation circuits ICL7660 chip, it can be under external device seldom realization+5V to the conversion of-5V; Chip U4 is the reference voltage special chip, because of chip U2ICL7135 belongs to 14 A/D converters, its reference voltage must be very accurate, and temperature coefficient is minimum, select for use model to provide reference voltage, utilize the standard output of its 2.500V to export the reference voltage of 1.0000V as chip U2 by a potentiometer W1 for the chip U4 of AD584;
1 pin of chip U2 links to each other with 5 pin of chip U3, the 1 pin connection+5V of chip U3,2 pin of chip U3 are connected the two ends of capacitor C 4 with 4 pin, the 3 pin ground connection of chip U3,5 pin of chip U3 connect an end of capacitor C 7, the other end ground connection of capacitor C 7,2 pin of chip U2 connect the middle slider end of potentiometer W1, the fixed resistance value end of potentiometer W1 connects capacitor C 8 simultaneously, the end of C9, and 3 pin of connection chip U4,3 pin of chip U4 and 1 pin short circuit, capacitor C 8,4 pin and another fixed resistance value end of potentiometer W1 and the while ground connection that connect chip U4 behind the other end short circuit of C9; 4 pin of chip U2 are connected with an end of capacitor C 12 and resistance R 6 through resistance R 5, capacitor C 11 simultaneously, and the other end of capacitor C 12 connects 5 pin of chip U2, and resistance R 6 other ends connect 6 pin of chip U2; The 3 pin ground connection of chip U2,4 pin of chip U2 connect the negative pole of the D2 of diode through resistance R 4, the positive pole of diode D2 connects 9 pin and the while ground connection of chip U2, and the 9 foot meridian capacitor C14 of chip U2 are connected with 10 pin of chip U2, and the 7 foot meridian capacitor C13 of chip U2 are connected with 8 pin of chip U2.
11 pin of chip U2 link to each other with 8 pin of chip U4 and are connected to+5V.26 pin of chip U2 are connected with 13 pin of chip U1,25 pin of chip U2 are connected to 14 pin of chip U1,13 pin of chip U2 are connected to 21 pin of chip U1,14 pin of chip U2 are connected to 22 pin of chip U1,15 pin of chip U2 are connected to 23 pin of chip U1, and 16 pin of chip U2 are connected to 24 pin of chip U1.
22 pin of chip U2 connect the output terminal of phase inverter U5 (B), the input end of phase inverter U5 (B) is connected with the output terminal of phase inverter U5 (A), an end of resistance R 3, the end of crystal oscillator pipe X2, an end of capacitor C 6 simultaneously, the other end of the input end of phase inverter U5 (A), the other end of resistance R 3, crystal oscillator pipe X2, an end of capacitor C 5 link together simultaneously, and the other end of capacitor C 5 and C6 interconnects back ground connection.Phase inverter U5 (A) and phase inverter U5 (B) are that model is two phase inverters in the hex inverter chip of CD4069, and being used for is that chip U2 produces running clock, and the clock frequency here is 300kHz,
Show and alarm unit comprises chip U6, two triode T4, T5 two light emitting diode LED1, LED2, liquid crystal interface P0; 16-9 pin of liquid crystal interface P0 are corresponding respectively to be connected with 32-39 pin of chip U1, ground connection behind 1 pin of liquid crystal interface P0 and the 3 pin short circuits, and 2 pin of liquid crystal interface P0 are connected+5V with 4 pin short circuits.
The model of chip U6 is 7400, chip U6 inside is provided with four U6 (A), U6 (B), U6 (C), the Sheffer stroke gate module of the two-way input of U6 (D), 1 of chip U6, connect 28 pin of chip U1 behind the 2 pin short circuits, 4 pin of chip U6,16 pin of 5 pin difference correspondence and chip U1,17 pin connect, 3 pin of the output terminal of the Sheffer stroke gate module U6 (A) of chip U6 are connected with 9 pin of the input end of Sheffer stroke gate module U6 (C), output terminal 6 pin of Sheffer stroke gate module U6 (B) are connected with 10 pin of the input end of Sheffer stroke gate module U6 (C), 12 pin of output terminal 8 pin of Sheffer stroke gate module U6 (C) and the input end of Sheffer stroke gate module U6 (D), 13 pin are connected, and output terminal 11 pin of Sheffer stroke gate module U6 (D) are connected with 8 pin of liquid crystal interface P0;
The base stage of triode T4 is connected to 10 pin of chip U1 through resistance R 8, the emitter of triode T4 is received+5V, the collector of triode T4 connects the positive pole of LED 1 through resistance R 9, the negative pole of LED 1 connects an end and the ground connection of the fixed resistance value end of potentiometer W2, the other end of the fixed resistance value end of potentiometer W2 is connected to+5V, and the middle slider end of potentiometer W2 is connected to 5 pin of liquid crystal interface P0; The base stage of triode T5 is connected to 11 pin of chip U1 through resistance R 10, the emitter of triode T5 is connected with the emitter of triode T4 and connects jointly+5V, the collector of triode T5 is received the positive pole of LED 2 through resistance R 11, and the negative pole of LED 2 is connected with the negative pole of LED 1;
The multiway analog switch unit comprises chip U7, current input terminal interface P2; 1-8 pin of current input terminal interface P2 are corresponding respectively to be connected with 13,14,15,12,1,5,2,4 pin of chip U7, corresponding end with measuring resistance row RP2 one side is connected respectively simultaneously, the corresponding end of measuring resistance row RP2 opposite side interconnects that the back is connected with the negative pole of LED 1, LED2 and links to each other with an end of the fixed resistance value end of potentiometer W2, common ground, ground connection behind 6 pin of chip U7, the 7 pin short circuits; The 8 pin ground connection of chip U7; 9,10,11 pin of chip U7 are corresponding respectively to be connected with 12,15,25 pin of chip U1, and 3 pin of chip U7 are connected to 10 pin of chip U2 through resistance R 7, and 16 pin of chip U7 are connected to+5V.
Power supply unit comprises transformer TB, rectifier bridge module BG1, BG2, automatic voltage regulator module Q1, Q2, Q3, battery-powered assembly and battery charger; The secondary side of transformer TB is provided with 8V winding L 1 and 27V winding L 2; Winding L 1 two ends connect the input end of rectifier bridge module BG1, the output terminal of rectifier bridge module BG1 also meets an electrochemical capacitor C15 and high frequency capacitance C16, the forward output terminal of rectifier bridge module BG1 is connected to the input end of automatic voltage regulator module Q1, the negative sense output terminal of rectifier bridge module BG1 connects the earth terminal of automatic voltage regulator module Q1, the output and ground of automatic voltage regulator module Q1 also meets capacitor C 17, C18, output terminal output 5V, earth terminal ground connection.
Battery-powered assembly comprises chip U8, U9, powered battery adopts high capacity 3500mAh, the Ni-MH battery of voltage 7.2V is as supplying cell, change out two kinds of power supplys, a kind of is the 5V direct supply that this combined type digital pressure calibration instrument uses, another kind is by the 24V direct supply on the calibration equipment, so just need a DC-to-DC to boost and decompression converting circuit, it is the DC/DC conversion module of MC34063 that chip U8 has adopted model commonly used, 1 pin of chip U8 connects positive pole and the inductance L 3 of diode D3 simultaneously, the negative pole of diode D3 is connected on resistance R 16 and the capacitor C 27 interconnective end points, is attempted by+the 24V power output end; The other end of resistance R 16 connects 5 pin of chip U8 simultaneously, 5 pin of chip U8 connect an end of resistance R 17, the other end of resistance R 17 is divided into two-way, one the tunnel is connected with 6 pin of chip U8 through capacitor C 26, another road ground connection that links to each other with 4 pin of chip U8, the 3 foot meridian capacitor C25 ground connection of chip U8,8 pin of chip U8 link to each other with 7 pin of chip U8 through resistance R 15,7 pin of chip U8 also are connected jointly with the other end of inductance L 3, an end of resistance R 14, and the other end of resistance R 14 is received cell voltage 7.2V; 2 pin of chip U8 are connected with the base stage of triode T6, and the base stage of triode T6 is passed through base resistance R13 ground connection, the grounded emitter of triode T6, and the collector of triode T6 is connected to 1 pin of chip U8; The other end ground connection of capacitor C 27;
1 pin of chip U9 connects resistance R 19, the end of R20, be connected to simultaneously on 7 pin of the collector of triode T7 and chip U9, the other end of resistance R 19 is connected cell voltage 7.2V, the other end of resistance R 20 is connected 8 pin of chip U9,3 pin of chip U9 are connected with ground through capacitor C 28, the 4 pin ground connection of chip U9,2 pin of chip U9 are connected to the base stage of triode T7, the base stage of triode T7 is by resistance R 18 ground connection, the emitter of triode T7 connects the negative terminal of inductance L 4 and diode D4, the positive ending grounding of diode D4, the other end of inductance L 4 is received on resistance R 21 and the end points that capacitor C 30 is connected and is connected+the 5V power output end, the other end ground connection of capacitor C 30, and the other end of resistance R 21 is connected to 5 pin of chip U9,5 pin of chip U9 are through resistance R 22 ground connection, and 6 pin of chip U9 are by capacitor C 29 ground connection.
Battery charger comprises current regulator diode D5, D6, D7, potentiometer W3, triode T8, T9, the LED 3 of charging process indication; The positive pole of the positive pole of current regulator diode D5 and LED 3 and capacitor C 31, one end of resistance R 12 links together, and with by power supply unit+12V is connected, the negative terminal of current regulator diode D5 is connected to an end of potentiometer W3 fixed resistance value end, the positive pole of another termination current regulator diode D6 of potentiometer W3 fixed resistance value end, the minus earth of current regulator diode D6, the middle slider end of potentiometer W3 is connected to the base stage of triode T8, the collector of triode T8 connects the negative pole of LED 3, link to each other with the other end of capacitor C 31 and the base stage of triode T9 simultaneously, the emitter of triode T8 links to each other with the positive pole of current regulator diode D7, the negative pole of current regulator diode D7 is connected the positive pole of battery E, the negative pole of battery E links to each other with the negative pole of current regulator diode D6 and ground connection, be connected with the collector of triode T9 simultaneously, the emitter of triode T9 connects on the other end of resistance R 12.
Decompression protection solenoid valve F1; F2; F3 adopts commercially available finished parts; three decompression protection solenoid valve F1; F2; the input mouth of pipe 8 of F3 is connected on three shunt valves 7; three decompression protection solenoid valve F1; F2; the output mouth of pipe 9 of F3 is directly to atmosphere; three shunt valves 7 are respectively by connecting pipe 6 and three lower ranges 7; 70; the pressure of 100Kpa inserts plug 3 and is connected; three decompression protection solenoid valve F1; F2; the F3 separate connection; not connected; three decompression protection solenoid valve F1; F2; corresponding respectively and three the triode T1 of the control coil of F3; T2; the emitter of T3 is connected; triode T1; T2; the collector of T3 links together and is attempted by+5V on; triode T1; T2; the base stage of T3 connects together; be connected with 8 pin of singlechip chip U1 through resistance R 2, control three-way electromagnetic valve T1 simultaneously by 8 pin of chip U1; T2; the open and close of T3.
On seven pressure access plugs 3, seven microswitch K1～K7 are housed respectively, the lead-in wire one end common ground of microswitch K1～K7, the other end is connected with the corresponding end pin 8～2 of touch switch input interface P1.
Seven microswitch K1～K7 are installed in the front panel back of cabinet 1, insert plug 3 with seven pressure respectively and fixedly connected, and will push up microswitch when the pressure of outside connects plug-in unit insertion pressure access plug 3.
Software section by the self check subroutine, detect subroutine, data processing subroutine, display subroutine etc. and form, finish the power-up initializing of peripheral components, self check, external interrupt, timer are set, and with the result in the first-class function of liquid crystal display.After instrument powers on, by a self-check program, judge the CPU part of instrument, the A/D chip, whether chip of LCD etc. are working properly, and show testing result on LCDs, if fault, demonstrate the device of problem on liquid crystal display; Self-check program is by a series of algorithm Authentication devices inside chip one by one, detecting subroutine is to finish input pressure and the automatic detection that is calibrated device current, the data processing subroutine is finished the conversion and the processing capacity of data, and display subroutine is presented at the result on the liquid crystal display.
Claims (2)
1, combined type digital pressure calibration instrument is made up of hardware and general detection, display routine, and described hardware comprises cabinet (1) and is installed in cabinet (1) interior controller, connecting pipe (6), decompression protection solenoid valve, modular pressure; The front panel of cabinet (1) is provided with power switch (4), LCDs (2), brightness button (5), pressure limit pilot lamp LED1, the low pilot lamp LED2 of cell voltage, a plurality of pressure access plug (3); A plurality of pressure insert plug (3) and are connected with a plurality of modular pressures by connecting pipe (6) is corresponding respectively, it is characterized in that:
Described controller comprises primary processor selected cell, A/D converting unit, demonstration and alarm unit, multiway analog switch unit, power supply unit; Described primary processor selected cell comprises singlechip chip U1, crystal oscillator X1, touch switch input interface P1; 2-8 pin of touch switch input interface P1 are corresponding respectively to be connected with 7-1 pin of singlechip chip U1, the corresponding respectively end that connects measuring resistance row RP1 of 7-1 pin of singlechip chip U1, the other end of measuring resistance row RP1 connects+5V jointly, 19,18 pin of singlechip chip U1 connect the two ends of crystal oscillator X1 respectively, capacitor C 1, each end of C2 are connected to the two ends of crystal oscillator X1, each other end serial connection back ground connection of capacitor C 1 and C2; 9 pin of singlechip chip U1 are connected with capacitor C 3 one ends, and the other end of capacitor C 3 connects an end of resistance R 1, the other end ground connection of resistance R 1, and diode D1 is attempted by the two ends of resistance R 1, the plus earth of diode D1, the two ends of capacitor C 3 also meet a reset button K;
Described A/D converting unit comprises chip U2, chip U3, chip U4, phase inverter U5 (A), phase inverter U5 (B) and crystal oscillator X2; Its chips U2 is the A/D conversion chip, and chip U3 adopts special-purpose change in polarity circuit chip, and chip U4 is the precision voltage reference chip, and chip U5 (A) and chip U5 (B) are that model is two phase inverters in the hex inverter chip of CD4069; 1 pin of chip U2 links to each other with 5 pin of chip U3, the 1 pin connection+5V of chip U3,2 pin of chip U3 are connected the two ends of capacitor C 4 with 4 pin, the 3 pin ground connection of chip U3,5 pin of chip U3 connect an end of capacitor C 7, the other end ground connection of capacitor C 7,2 pin of chip U2 connect the middle slider end of potentiometer W1, the fixed resistance value end of potentiometer W1 connects capacitor C 8 simultaneously, the end of C9, and 3 pin of connection chip U4, the 3 pin short circuits of 1 pin of chip U4 and chip U4, capacitor C 8,4 pin and the ground connection that connect chip U4 behind the other end short circuit of C9, another fixed resistance value end of potentiometer W1 connect 4 pin and the while ground connection of chip U4; 4 pin of chip U2 are connected with an end of capacitor C 12 and resistance R 6 through resistance R 5, capacitor C 11 simultaneously, the other end of capacitor C 12 connects 5 pin of chip U2, the other end of resistance R 6 connects 6 pin of chip U2,4 pin of chip U2 connect the negative pole of the D2 of diode through resistance R 4, the positive pole of diode D2 connects 9 pin and the while ground connection of chip U2, the 9 foot meridian capacitor C14 of chip U2 are connected with 10 pin of chip U2, and the 7 foot meridian capacitor C13 of chip U2 are connected with 8 pin of chip U2;
11 pin of chip U2 link to each other with 8 pin of chip U4 and are connected to+5V; 26 pin of chip U2 are connected with 13 pin of singlechip chip U1,25 pin of chip U2 are connected to 14 pin of singlechip chip U1,13 pin of chip U2 are connected to 21 pin of singlechip chip U1,14 pin of chip U2 are connected to 22 pin of singlechip chip U1,15 pin of chip U2 are connected to 23 pin of singlechip chip U1, and 16 pin of chip U2 are connected to 24 pin of singlechip chip U1;
22 pin of chip U2 connect the output terminal of phase inverter chip U5 (B), the input end of phase inverter chip U5 (B) is connected with the output terminal of phase inverter chip U5 (A), an end of resistance R 3, the end of crystal oscillator X2, an end of capacitor C 6 simultaneously, the other end of the input end of phase inverter chip U5 (A), the other end of resistance R 3, crystal oscillator X2, an end of capacitor C 5 link together simultaneously, and the other end of capacitor C 5 and C6 interconnects back ground connection;
Described demonstration and alarm unit comprise chip U6, two triode T4, T5, two LEDs 1, LED2, liquid crystal interface P0; Wherein said chip U6 is the Sheffer stroke gate module chip that is provided with four two-way inputs in the sheet; 16-9 pin of liquid crystal interface P0 are corresponding respectively to be connected with 32-39 pin of singlechip chip U1, ground connection behind 1 pin of liquid crystal interface P0 and the 3 pin short circuits, and 2 pin of liquid crystal interface P0 are connected+5V with 4 pin short circuits;
1 of chip U6,28 pin of order sheet machine chip U1 behind the 2 pin short circuits, 4 pin of chip U6,16 pin of 5 pin difference correspondence and singlechip chip U1,17 pin connect, 3 pin of the output terminal of the Sheffer stroke gate module U6 (A) of chip U6 are connected with input end 9 pin of Sheffer stroke gate module U6 (C), 6 pin of the output terminal of Sheffer stroke gate module U6 (B) are connected with 10 pin of the input end of Sheffer stroke gate module U6 (C), 12 pin of output terminal 8 pin of Sheffer stroke gate module U6 (C) and the input end of Sheffer stroke gate module U6 (D), 13 pin are connected, and output terminal 11 pin of Sheffer stroke gate module U6 (D) are connected with 8 pin of liquid crystal interface P0;
The base stage of triode T4 is connected to 10 pin of singlechip chip U1 through resistance R 8, the emitter of triode T4 is received+5V, the collector of triode T4 connects the positive pole of LED 1 through resistance R 9, the negative pole of LED 1 is connected with an end of the fixed resistance value end of potentiometer W2 and ground connection, the other end of the fixed resistance value end of potentiometer W2 is connected to+5V, the middle slider end of potentiometer W2 is connected to 5 pin of liquid crystal interface P0, the base stage of triode T5 is connected to 11 pin of singlechip chip U1 through resistance R 10, the emitter of triode T5 is connected with the emitter of triode T4 and connects jointly+5V, the collector of triode T5 is received the positive pole of LED 2 through resistance R 11, and the negative pole of LED 2 is connected with the negative pole of LED 1;
Described multiway analog switch unit comprises chip U7, current input terminal interface P2; Described chip U7 is the multiway analog switch chip; 1-8 pin of current input terminal interface P2 are corresponding respectively to be connected with 13,14,15,12,1,5,2,4 pin of chip U7, corresponding end with measuring resistance row RP2 one side is connected respectively simultaneously, the corresponding end of measuring resistance row RP2 opposite side interconnects the back common ground that is connected with the negative pole of LED 1, LED2, ground connection behind 6 pin of chip U7, the 7 pin short circuits; The 8 pin ground connection of chip U7,16 pin of chip U7 are received+5V; 9,10,11 pin of chip U7 are corresponding respectively to be connected with 12,15,25 pin of singlechip chip U1, and 3 pin of chip U7 are connected to 10 pin of chip U2 through resistance R 7;
Described power supply unit comprises transformer TB, rectifier bridge module BG1, BG2, automatic voltage regulator module Q1, Q2, Q3, battery-powered assembly and battery charger; The secondary side of transformer TB is provided with 8V winding L 1 and 27V winding L 2; Winding L 1 two ends connect the input end of rectifier bridge module BG1, the output terminal of rectifier bridge module BG1 also meets an electrochemical capacitor C15 and high frequency capacitance C16, the forward output terminal of rectifier bridge module BG1 is connected to the input end of automatic voltage regulator module Q1, the negative sense output terminal of rectifier bridge module BG1 connects earth terminal and the ground connection of automatic voltage regulator module Q1, the output and ground of automatic voltage regulator module Q1 also meets capacitor C 17, C18, output terminal output+5V;
Winding L 2 two ends connect the input end of rectifier bridge module BG2, the output terminal of rectifier bridge module BG2 also meets an electrochemical capacitor C19 and high frequency capacitance C20, the forward output terminal of rectifier bridge module BG2 is connected to the input end of automatic voltage regulator module Q2, the negative sense output terminal of rectifier bridge module BG2 connects earth terminal and the ground connection of automatic voltage regulator module Q2, between the output and ground of automatic voltage regulator module Q2 and connect capacitor C 21, C22, output terminal output 24V, the output terminal of automatic voltage regulator module Q2 also connects the input end of automatic voltage regulator module Q3 simultaneously, between the output terminal of automatic voltage regulator module Q3 and the ground and connect capacitor C 23, C24, output terminal output 12V;
Described battery-powered assembly comprises chip U8, U9, and chip U8 and chip U9 are one chip DC/DC transducers; 1 pin of chip U8 connects positive pole and the inductance L 3 of diode D3 simultaneously, and the negative pole of diode D3 is connected on resistance R 16 and the capacitor C 27 interconnective end points, is attempted by+the 24V power output end; The other end of resistance R 16 connects 5 pin of chip U8 simultaneously, 5 pin of chip U8 connect an end of resistance R 17, the other end of resistance R 17 is divided into two-way, one the tunnel is connected with 6 pin of chip U8 through capacitor C 26, another road ground connection that links to each other with 4 pin of chip U8, the 3 foot meridian capacitor C25 ground connection of chip U8,8 pin of chip U8 link to each other with 7 pin of chip U8 through resistance R 15,7 pin of chip U8 also are connected jointly with the other end of inductance L 3, an end of resistance R 14, and the other end of resistance R 14 is received cell voltage 7.2V; 2 pin of chip U8 are connected with the base stage of triode T6, and the base stage of triode T6 is passed through base resistance R13 ground connection, the grounded emitter of triode T6, and the collector of triode T6 is connected to 1 pin of chip U8; The other end ground connection of capacitor C 27;
1 pin of chip U9 connects resistance R 19, the end of R20, be connected to simultaneously on 7 pin of the collector of triode T7 and chip U9, the other end of resistance R 19 is connected cell voltage 7.2V, the other end of resistance R 20 is connected 8 pin of chip U9,3 pin of chip U9 are connected with ground through capacitor C 28, the 4 pin ground connection of chip U9,2 pin of chip U9 are connected to the base stage of triode T7, the base stage of triode T7 is by resistance R 18 ground connection, the emitter of triode T7 connects the negative terminal of inductance L 4 and diode D4, the positive ending grounding of diode D4, the other end of inductance L 4 is received on resistance R 21 and the end points that capacitor C 30 is connected and is connected+the 5V power output end, the other end ground connection of capacitor C 30, and the other end of resistance R 21 is connected to 5 pin of chip U9,5 pin of chip U9 are through resistance R 22 ground connection, and 6 pin of chip U9 are by capacitor C 29 ground connection;
Described battery charger comprises current regulator diode D5, D6, D7, potentiometer W3, triode T8, T9, the LED 3 of charging process indication; The positive pole of the positive pole of current regulator diode D5 and LED 3 and capacitor C 31, one end of resistance R 12 links together, and with by power supply unit+12V is connected, the negative terminal of current regulator diode D5 is connected to an end of potentiometer W3 fixed resistance value end, the positive pole of another termination current regulator diode D6 of potentiometer W3 fixed resistance value end, the minus earth of current regulator diode D6, the middle slider end of potentiometer W3 is connected to the base stage of triode T8, the collector of triode T8 connects the negative pole of LED 3, link to each other with the other end of capacitor C 31 and the base stage of triode T9 simultaneously, the emitter of triode T8 links to each other with the positive pole of current regulator diode D7, the negative pole of current regulator diode D7 is connected the positive pole of battery E, the negative pole of battery E links to each other with the negative pole of current regulator diode D6 and ground connection, be connected with the collector of triode T9 simultaneously, the emitter of triode T9 connects on the other end of resistance R 12;
The input mouth of pipe (8) of described a plurality of decompression protection solenoid valves is corresponding respectively to be connected with a plurality of shunt valves (7), a plurality of shunt valves (7) insert the corresponding connection of plug (3) by a plurality of connecting pipes (6) with a plurality of pressure respectively, the output mouth of pipe (9) of decompression protection solenoid valve directly is communicated with atmosphere, a plurality of decompression protection solenoid valve separate connection, not connected, the control coil of decompression protection solenoid valve is corresponding respectively to be connected with the emitter of a plurality of triodes, the base stage of a plurality of triodes also connects, and is connected through 8 pin of resistance R 2 with single-chip microcomputer singlechip chip U1;
A plurality of pressure insert on the plug 3 a plurality of microswitches are housed respectively, the lead-in wire one end common ground of microswitch, and the other end is connected with the corresponding end pin of touch switch input interface P1.
2, combined type digital pressure calibration instrument according to claim 1; it is characterized in that: above-mentioned a plurality of decompression protection solenoid valves are arranged to three, and being installed in range respectively is that three pressure of 7kpa, 70kpa, 100kap insert on the shunt valve (7) that plugs (3) are connected.
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| CNB2007101578926A CN100498261C (en) | 2007-11-02 | 2007-11-02 | Combined type digital pressure calibration instrument |
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| CNB2007101578926A CN100498261C (en) | 2007-11-02 | 2007-11-02 | Combined type digital pressure calibration instrument |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101832838B (en) * | 2010-05-13 | 2012-07-04 | 西北工业大学 | Device for converting pressure calibration data into data tables |
| CN102455237A (en) * | 2010-11-01 | 2012-05-16 | 南车洛阳机车有限公司 | Digital display pressure gauge test bench |
| RU2456564C1 (en) * | 2011-03-14 | 2012-07-20 | Открытое акционерное общество "Манотомь" | Indicating pressure gauge with induction sensors |
| CN102856886B (en) * | 2012-08-31 | 2015-09-02 | 华南理工大学 | A kind of batteries of electric automobile protective circuit |
| CN102928010A (en) * | 2012-09-29 | 2013-02-13 | 内蒙航天动力机械测试所 | Sensor calibration controller |
| CN102937502A (en) * | 2012-11-07 | 2013-02-20 | 昆山北极光电子科技有限公司 | Pressure measuring method of rotator |
| CN103234695B (en) * | 2013-04-24 | 2015-09-02 | 武汉航空仪表有限责任公司 | A kind of detection check circuit of pressure unit and method thereof |
| CN109506832A (en) * | 2018-10-19 | 2019-03-22 | 陕西航空电气有限责任公司 | Working in double modes dynamometer calibrating installation |
| CN109696276A (en) * | 2019-02-28 | 2019-04-30 | 唐山百川智能机器股份有限公司 | A kind of detection device of resistor-type locomotive pressure instrument |
| CN110807893B (en) * | 2019-11-12 | 2023-06-06 | 无锡蓝天电子股份有限公司 | Household fire alarm controller with program fault function |
| CN113917310B (en) * | 2021-08-26 | 2024-02-09 | 深圳市菲尼基科技有限公司 | Integrative protection shield test system |
| CN117782424A (en) * | 2023-12-27 | 2024-03-29 | 小米汽车科技有限公司 | Method, system, vehicle and medium for calibrating force sensor on caliper |
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