CN2414422Y

CN2414422Y - Multi-purpose leakage protector tester

Info

Publication number: CN2414422Y
Application number: CN 00205840
Authority: CN
Inventors: 黄新华
Original assignee: TIANJIN TIANMA WIRE AND CABLE INDUSTRY CORP
Current assignee: TIANJIN TIANMA WIRE AND CABLE INDUSTRY CORP
Priority date: 2000-02-24
Filing date: 2000-02-24
Publication date: 2001-01-10
Anticipated expiration: 2010-02-24

Abstract

The utility model relates to a multi-purpose leakage protector tester, which belongs to a testing tool of power system, and comprises a casing, a display, a power switch, a detection switch, a function key and a test jack. A testing circuit of the utility model comprises a multimeter portion and a leakage detecting portion, wherein, the multimeter portion is composed of a resistor input, a current input, a voltage input, an interface transform circuit, a D/A changeover circuit and a driving display circuit, and the leakage detecting portion is composed of a leakage current testing circuit, a voltage locking circuit and a control circuit. The utility model has the advantages of small size, light weight, low power consumption and convenient carrying, and has the functions of leakage detection and a multimeter in the meanwhile.

Description

The multi-purpose type tester for leakage protector

The utility model relates to a kind of testing tool of electric system.

Majority all is equipped with leakage protection system or earth leakage protective device in electric system at present or the power-supply unit; in case principal vertical line road electric leakage or the accident or cause unnecessary loss of meeting accident when getting an electric shock; therefore; the requirement earth leakage protective device must be when producing certain leakage current; in effective time, in time cut off the electricity supply; promptly need a kind of special detecting instrument to detect and whether the earth leakage protective device quality is qualified; and existing detecting instrument volume is bigger; carry and use very inconvenience; and function singleness; except that detection of electrical leakage, do not have other function.

The utility model purpose provides little easy to carry and the multi-purpose type tester for leakage protector with multiple function of a kind of volume.

The utility model comprises housing; the LCD that is provided with on the housing, power switch, detector switch; function selecting key; testing circuit in the test jack, leakage current adjusting knob and housing is formed, and it is characterized in that the formation of testing circuit comprises first via resistance input circuit; the second road electric current input circuit; Third Road voltage input circuit, the No. four earth leakage protective device input circuit actuation time, the No. five earth leakage protective device breaking current input circuit.The output in five loops is sent D/A change-over circuit through interface conversion circuit simultaneously, send into again to drive and show, the four the tunnel actuation time input circuit, clock signal process counting circuit by time base circuit produces send the number lock circuit, send A/D change-over circuit, after send into interface conversion circuit again, the output of the five road breaking current testing circuit is sent into interface conversion circuit through the superpotential lock-in circuit, voltage lock-in circuit wherein, and number lock circuit and interface conversion circuit are controlled by control circuit.

The utility model advantage: 1, complete machine mainly adopts international coms element, and volume is little, in light weight, power consumption is little, easy to carry; Have multimeter measurement functions such as detection of electrical leakage function and resistance, electric current, voltage when 2, this is tester simultaneous, multiple functional, use extensively.

The utility model embodiment accompanying drawings is as follows:

Fig. 1: multi-purpose type tester for leakage protector theory diagram;

Fig. 2: connect reference diagram by the 9207 multimeter partial circuits that constitute;

Fig. 3: the detection of electrical leakage partial circuit connects reference diagram;

Fig. 4: power supply power supply the principle reference diagram;

Fig. 5: tester is with reference to outside drawing.

As shown in Figure 1, this tester comprises first via resistance input circuit, the second road electric current input circuit, Third Road voltage input circuit, the output in three loops is sent D/A change-over circuit through interface conversion circuit simultaneously, send into again to drive to show, more than three the road constitute the multimeter parts, its physical circuit connection layout is seen Fig. 2, and main 9207 chips that adopt of this multimeter part constitute.

By the physical circuit of the 4th detection of electrical leakage part that constitutes with the 5th loop be connected see shown in Figure 3, the four tunnel electric leakage input circuit actuation time send the number lock circuit by the clock signal that time base circuit produces through counting circuit, send the A/D change-over circuit to send into interface conversion circuit again, the output of the five road breaking current testing circuit is sent into interface conversion circuit through the superpotential lock-in circuit, promptly two 741 and peripheral cell constitute the absolute value rectification circuit, rectifier bridge and light idol Q1, the voltage monitoring circuit that G1 rejection gate U8 (4001) forms, analog switch U5 forms the voltage latch cicuit, voltage latch cicuit wherein, number lock circuit and interface conversion circuit are controlled by control circuit.The effect of control circuit mainly is to produce, export digital signal, physical circuit is formed a switch matrix by a pull-up resistor and many pull down resistors, from switch matrix, produce decimal code, decimal code is translated into binary-coded decimal through 3 priority encoder U12 (4532) with decimal code, the binary-coded decimal signal flows into again to be finished control signal under quadruple D-latch UB (4042) produces circuit U 17 (4017) at narrow pulse signal the cooperation and latchs, and the signal after latching goes to control inner the switching and outside the switching respectively.The function commutation circuit is finished external analog amount input switching by decoding scheme U11 (4028) and specialized simulation switch integrated circuit U5 (4066).(control signal of coming from control circuit is done the level finishing through U14 (4071) and is gone to control inner mode and switch.

Drive demonstration and D/A analog to digital conversion and mainly form 131 (crystal oscillator) C5 (68P), see Fig. 2 by integrated circuit U19 (9207) and a small amount of peripheral cell.Among Fig. 3 among node A and Fig. 2 9207 pin 75 be connected, node B is connected with 9207 pin 18, node C is connected with 9207 pin 19, node D is connected with 9207 pin 20.

Fig. 5 is a tester profile reference diagram, and 1 is LCD among the figure, and 2 is power switch, and 3 is detector switch, and 4 is function selecting key, and 5 is test jack, and 6 is the leakage current adjusting knob.

Using method:

The first, voltage measurement is inserted the com jack with black meter pen, and red penholder is gone into the A jack, presses the ACV function button and can carry out ac voltage measurement, presses the DCV button, can carry out dc voltage measurement.

The second, current measurement is inserted the com jack with black meter pen, and red test pencil inserts the A jack, presses the ACA button, can carry out ac current measurement, presses DCA and can carry out dc current measurement.

Three, resistance measurement is inserted the com jack with black meter pen, and red test pencil inserts the Ω jack, presses the Ω button, can carry out resistance measurement, will Button connects down, can carry out diode measurement.

Four, earth leakage protective device is measured, and 1. black meter pen is inserted the com hole, and red test pencil inserts the AC hole and presses the LDI button, and with another termination AC220V red, black meter pen, it is earth leakage protective device leakage current setting that the adjusting current knob makes electric current; 2. press the LDt button, will deceive table and insert an other end ground connection, another termination earth leakage protective device output live wire of red test pencil is pressed detector switch, and the earth leakage protective device branch is had no progeny, and display demonstrates the actuation time of leaking electricity.

Claims

1, a kind of multi-purpose type tester for leakage protector comprises housing, the LCD that is provided with on the housing, power switch, detector switch, function selecting key, test jack, testing circuit in leakage current adjusting knob and the housing is formed, the formation that it is characterized in that testing circuit comprises first via resistance input circuit, the second road electric current input circuit, Third Road voltage input circuit, the No. four earth leakage protective device input circuit actuation time, the No. five earth leakage protective device breaking current input circuit; The output in five loops is sent D/A change-over circuit through interface conversion circuit simultaneously, send into again to drive and show, the four the tunnel actuation time input circuit, clock signal process counting circuit by time base circuit produces send the number lock circuit, send A/D change-over circuit, after send into interface conversion circuit again, the output of the five road breaking current testing circuit is sent into interface conversion circuit through the superpotential lock-in circuit, voltage lock-in circuit wherein, and number lock circuit and interface conversion circuit are controlled by control circuit.