CN203101592U - Electromagnetic relay comprehensive parameter test instrument - Google Patents
Electromagnetic relay comprehensive parameter test instrument Download PDFInfo
- Publication number
- CN203101592U CN203101592U CN 201320131056 CN201320131056U CN203101592U CN 203101592 U CN203101592 U CN 203101592U CN 201320131056 CN201320131056 CN 201320131056 CN 201320131056 U CN201320131056 U CN 201320131056U CN 203101592 U CN203101592 U CN 203101592U
- Authority
- CN
- China
- Prior art keywords
- module
- port
- voltage
- links
- electromagnetic relay
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The utility model relates to an electromagnetic relay comprehensive parameter test instrument, relates to a device for testing electric properties of a circuit interrupter and provides an electromagnetic relay comprehensive parameter test instrument which performs continuous measurement as time goes by. The electromagnetic relay comprehensive parameter test instrument comprises a constant current source module, a microcomputer control module, a resetting module, an amplification module, an A/D (analog-to-digital) conversion module, a printing module, a display module, an alarm module, a power source module, a key module and a parameter measurement module, wherein the constant current source module is connected with the parameter measurement module; the parameter measurement module is further connected with the amplification module; the amplification module is further connected with the A/D conversion module; the A/D conversion module is connected with the microcomputer control module; the microcomputer control module is also connected with the printing module, the display module, the alarm module, the key module and the resetting module; and the power source module is connected with each module of the test instrument. The utility model overcomes the defects of big error and low accuracy in the existing process of detecting characteristic parameters of a relay through artificial discrete instrumentation.
Description
Technical field
The technical solution of the utility model relates to the proving installation of the electrical property of circuit interrupter, specifically the electromagnetic relay comprehensive parameter tester.
Background technology
Relay is electric elements commonly used in electric system and other electric control system, and its reliability is the important assurance of electric system and other electric control system reliability service.Along with relay being extensive use of of aspects such as national defence, also more and more higher to the requirement of the quality of relay, Performance And Reliability.Therefore, just need regularly test the characterisitic parameter of relay.The measuring method of the characterisitic parameter of existing relay adopts artificial discrete instrument to detect, and the error that is caused by artificial factor is big, and precision is low.The application scenario of electromagnetic type relay is day by day extensive, method, measuring accuracy and automaticity that the electromagnetic relay comprehensive parameters is detected require also to improve constantly, therefore, detect the electromagnetic relay comprehensive parameters by artificial discrete instrument and urgent demand is arranged to the conversion of automatic detection electromagnetic relay comprehensive parameters.
The utility model content
Technical problem to be solved in the utility model is: the electromagnetic relay comprehensive parameter tester is provided, be a kind of electromagnetic relay comprehensive parameter tester that carries out continuous coverage that changes in time, overcome the big and low shortcoming of precision of error that the artificial discrete instrument of existing employing detects the characterisitic parameter of relay.
The utility model solves this technical problem the technical scheme that is adopted: the electromagnetic relay comprehensive parameter tester comprises constant current source module, system controlled by computer module, reseting module, amplification module, A/D modular converter, print module, display module, alarm module, power module, key-press module and parameter measurement module; The constant current source module links to each other with the parameter measurement module, the parameter measurement module links to each other with amplification module again, amplification module links to each other with the A/D modular converter again, the A/D modular converter links to each other with the system controlled by computer module again, the system controlled by computer module also links to each other with print module, display module, alarm module, key-press module and reseting module, and power module links to each other with each module of this tester.
Above-mentioned electromagnetic relay comprehensive parameter tester, described constant current source module is a constant-current source circuit, comprise load module and V/I modular converter, described load module is that the slide rheostat of 1K and BUT-11A type triode are formed and carried one+12V D.C. regulated power supply by resistance, and the V/I modular converter is made of with the Darlington circuit that TIP122 transistor Q1, TIP122 transistor Q2 and TIP122 transistor Q3 form accurate amplifier OP27.
Above-mentioned electromagnetic relay comprehensive parameter tester includes testing total program and interrupt routine in the described system controlled by computer module, and the flow process of these programs is as follows:
Is the flow process of testing total program: system initialization → timer initialization → interruption initialization → have button to press?
The retrieval system initialization;
It is function button?
It is reset key?
The retrieval system initialization;
Display parameter;
It is the PV key?
Interrupt routine 1 → end;
It is the RV key?
Interrupt routine 2 → end;
It is the PT key?
Interrupt routine 3 → end;
It is the RT key?
Interrupt routine 4 → end;
It is the CR key?
Interrupt routine 5 → end;
Display subroutine → display parameter → end → retrieval system initialization.
Does the flow process of interrupt routine is: interrupt routine begin → judges Flag=1?
Calling FUN1 function → interrupt routine finishes;
Do you judge Flag=2?
Calling FUN2 function → interrupt routine finishes;
Do you judge Flag=3?
Calling FUN3 function → interrupt routine finishes;
Do you judge Flag=4?
Calling FUN4 function → interrupt routine finishes;
Do you judge Flag=5?
Calling FUN5 function → interrupt routine finishes;
Interrupt routine finishes.
Above-mentioned electromagnetic relay comprehensive parameter tester, described reseting module includes reset routine, and the reset routine flow process of this reset routine is as follows:
The reset routine flow process: reset routine begins → program initialization → judge that parameter exceeds preset value?
Does the automatically reset time reach preset value?
Automatically reset → finish,
Wait for next bar instruction;
Is there reset key to press?
The retrieval system initialization;
Hand-reset → end.
Above-mentioned electromagnetic relay comprehensive parameter tester, described alarm module is to be made of sound light alarming circuit, two branch roads of this circuit are connected on the two ends of loudspeaker respectively, wherein branch road is the end that the resistance of one 300 Ω of light emitting diode series connection is connected on loudspeaker, this end also meets power supply VCC, another branch road is the base stage of the resistance series connection triode of a 10K, and the collector of this triode is connected the other end of loudspeaker, the grounded emitter of this triode.
Above-mentioned electromagnetic relay comprehensive parameter tester, described power module is a power circuit, comprises that 1 no-load voltage ratio is 220/15 transformer, 4 one group of full rectifier bridge, 4 voltage stabilizers, 3 electrochemical capacitors and 4 common electric capacity compositions that diode is formed; AV220V voltage is behind a transformer T1, step-down is AC15V, being IN4001 with one group of model then, full-bridge rectification diode D5 links to each other, be divided into three branch roads afterwards, article one, branch road and capacity are that capacitor C 5 backs in parallel and the model of 2200 μ are that the voltage stabilizer U11 input end of LM7812 is connected, voltage stabilizer U11 output terminal and capacity are to be that the voltage stabilizer U12 input end of LM7805 links to each other with model again after capacitor C 6 parallel connections of 0.1 μ, output terminal one end output+5V voltage after the capacitor C 7 that voltage stabilizer U12 capacity in parallel again is 0.1 μ, other end ground connection; Second branch road and capacity are to be that the voltage stabilizer U13 input end of LM7812 links to each other with model again after capacitor C 8 parallel connections of 2200 μ, and voltage stabilizer U13 is after the shunt capacitance capacity is the C9 of 0.1 μ again, output terminal output-12V voltage, other end ground connection; Article three, branch road and capacitance are to be that the voltage stabilizer U14 input end of LM7805 links to each other with model after the C10 parallel connection of 2200 μ, and voltage stabilizer U14 shunt capacitance capacity again is the capacitor C 11 back output VCC of 0.1 μ, other end ground connection.
Above-mentioned electromagnetic relay comprehensive parameter tester, described parameter measurement module comprises two circuit: the one, and release voltage, pick-up voltage, the metering circuit of pickup time and release time, the 2nd, the measuring contact resistance circuit, release voltage wherein, pick-up voltage, the formation of the metering circuit of pickup time and release time is: the port one of potentiometer X9313 and port 2 meet the port P1.0 and the port P1.1 of single-chip microcomputer respectively, port 4 ground connection of potentiometer X9313, the port 8 of potentiometer X9313 connects power supply, the port 5 of potentiometer X9313 is received on the port 3 of OP07, the port 3 of potentiometer X9313, port 6 and port 7 are unsettled, the port 5 of OP07 connects-15V voltage, the port 7 of OP07 connects+15V voltage, the port 6 of OP07 is succeeded the end of electrical equipment J, the port 2 of OP07 and model are that the diode cathode of IN4148 links to each other, the port 8 of OP07 is unsettled, model is that the diode cathode of IN4148 links to each other with the other end of relay J and ground connection, the end of relay coil S7 is through a 1K resistance eutral grounding, the port 3 of another termination LM358N of relay coil S7, the port 4 of LM358N connects-12V voltage, the port 8 of LM358N connects+12V voltage, the port 2 of LM358N links to each other with port one, receives on the D/A converter; The formation of measuring contact resistance circuit is: the constant current source output terminal links to each other with an end of relay contact, the other end of relay contact is connected to LM358N port 3, the port 4 of LM358N connects-12V voltage, the port 8 of LM358N connects+12V voltage, the port one of LM358N links to each other with port 2 and is connected on the port 3 of OP07, the port 5 of OP07 connects-15V voltage, the port 7 of OP07 connects+15V voltage, the end of the port 2 connecting resistance R15 of OP07, the other end of resistance R 15 is with an end ground connection of resistance R 16, the port 6 of OP07 is connected to A/D converter with the other end 6 of resistance R 1, and the port 8 of OP07 is unsettled.
Above-mentioned electromagnetic relay comprehensive parameter tester, the operational amplifier in the described amplification module adopts OP07.
Above-mentioned electromagnetic relay comprehensive parameter tester, the A/D conversion chip ADC0832 of employing 8 bit resolutions in the described A/D modular converter.
Above-mentioned electromagnetic relay comprehensive parameter tester, described system controlled by computer module mainly is made up of single-chip microcomputer and SCM peripheral circuit, and this single-chip microcomputer is selected AT89C51 for use.
Above-mentioned electromagnetic relay comprehensive parameter tester, described display module is selected LCDs LCD1602.
Above-mentioned electromagnetic relay comprehensive parameter tester, what described print module mainly adopted is LASER PP40 printer.
Above-mentioned electromagnetic relay comprehensive parameter tester, described key-press module are provided with automatic measurement button, reset key and manual measurement button.
Above-mentioned electromagnetic relay comprehensive parameter tester, the constituted mode of described amplification module, A/D modular converter, print module and display module is well-known in the art.
Above-mentioned electromagnetic relay comprehensive parameter tester, used components and parts and parts all are that those skilled in the art are known, can be by commercially available or own making easily, the mode of connection of the connected mode between all components and parts, the mounting means of parts and power circuit also is that those skilled in the art are known.
The beneficial effects of the utility model are: the utility model electromagnetic relay comprehensive parameter tester has outstanding numeric type characteristics and obvious improvement, overcome the big and low shortcoming of precision of error that the artificial discrete instrument of existing employing detects the characterisitic parameter of relay, be mainly reflected in following aspect:
What (1) desirable constant current source produced is a desirable steady current, but side circuit can not produce such steady current, therefore will reduce the error of constant current source, and avoid bringing bigger error to follow-up measurement, the constant current source module must adopt the very high device of precision to constitute for this reason.The utility model is the principle of a very large power supply of the internal resistance of source according to constant current source, has adopted transistor to replace infinitely-great resistance.Know according to experiment, influence constant current source stablize output current will be by two amount decisions: power supply and pull-up resistor.Power supply is generally all fixed, and so, the deciding factor that influences output current is exactly a pull-up resistor.Again according to experimental data as can be known: when pull-up resistor was very little, output current was very fixed constant basically.The contact resistance resistance that the utility model will be measured only has tens milliohms, and therefore available triode is realized constant current.Be made up of a triode and a slide rheostat and a fixed value resistance, the part of slide rheostat, fixed value resistance are connected with triode.Provide one+12V D.C. regulated power supply by power module, provide normal working voltage to input circuit.
(2) the system controlled by computer module is core of the present utility model, and by the operation to control module, the utility model electromagnetic relay parameter tester is achieved the automatic and manual measurement of parameter PV, RV, PT, RT, CR.The system controlled by computer module mainly is made up of single-chip microcomputer and SCM peripheral circuit.Single-chip microcomputer is selected AT89C51 for use.AT89C51 provides following standard feature: 4K bytes Flash flash memory, 128 byte inner RAM, 32 I/O mouth lines, two 16 bit timings/counters, one 5 vectorial two-stage interrupt structure, a full duplex serial communication port, sheet internal oscillator and clock circuit.Simultaneously, AT89C51 can reduce to the static logic operation of 0Hz, and supports two kinds of optional power saving operation patterns of software.Idle mode stops the work of CPU, but allows RAM, Timer, and serial communication port and interrupt system work on.Power-down mode is preserved the content among the RAM, but oscillator quits work and forbids that other all parts work are up to next hardware reset.
(3) the reseting module function of the utility model electromagnetic relay parameter tester is to stop ongoing program, removes fault, makes system initialization routine, restarts operation.
(4) amplification module is mainly used to the voltage at amplifying relay two ends.According to Ohm law, R=U/I, owing to electric current is produced by constant current source, so electric current is a steady state value.When the contact resistance at relay two ends changed, corresponding variation also took place in the voltage at its two ends, as long as the voltage at relay two ends is measured, just can calculate the dynamic contact resistance of relay according to Ohm law.Because the contact resistance of relay is generally tens milliohms, the electric current that constant current source produces also has only several amperes, so the voltage at relay two ends also has only tens millivolts, faint like this voltage does not reach A/D and changes needed voltage request, therefore need be with this voltage amplification.The amplification module of the utility model electromagnetic relay parameter tester adopts and amplifies the high operational amplifier OP07 of precision.The OP07 chip is a kind of low noise, the bipolarity operational amplifier integrated circuit of non-chopper-zero-stabilized.Because OP07 has low-down input offset voltage (OP07A is 25uV to the maximum), so OP07 does not need extra zeroing measure in a lot of application scenarios.OP07 have simultaneously input bias current low (wherein OP07A for ± 2nA) and the characteristics of open-loop gain height (wherein OP07A is 300V/mV).The characteristic of this low imbalance and high open-loop gain makes OP07 be specially adapted to the feeble signal aspect of the measuring equipment and the amplification sensor of high-gain.The important technological parameters of OP07 has: ultralow skew is 150uV, low input bias current is 1.8nA, the low maladjustment voltage drift is for 0.5uV/ ℃, the supply voltage scope is ± 3V～± 22V, supply voltage is ± 22V, input voltage is ± 22V that its open loop enlargement factor can reach 1000000, has satisfied requirement of the present utility model far away.
(5) effect of A/D modular converter is to convert the voltage analog signal that a last module is measured to voltage digital signal, gives the system controlled by computer module with digital signal transfers, handles in order to the system controlled by computer module.That the A/D modular converter of the utility model electromagnetic relay parameter tester is selected is ADC0832.ADC0832 is 8 bit resolution A/D conversion chips, and its best result is distinguished and can be reached 256 grades, can adapt to general analog quantity conversion requirement.Its internal electric source input is multiplexing with reference voltage, makes the aanalogvoltage of ADC0832 chip import between 0～5V.ADC0832 chip switching time only is 32uS, and according to there being Double Data output to can be used as data check, to reduce data error, slewing rate is fast and stability is strong.Independently the Enable Pin CS of ADC0832 chip receives single-chip microcomputer one port, and input low level makes many devices articulate convenient that control becomes with processor, by the DI data input pin, can realize the selection of channel function easily.The principal feature of ADC0832 is: 8 bit resolutions, double channel A/D conversion, input and output level are compatible mutually with TTL/CMOS, during the power supply of 5V power supply input voltage between 0～5V, frequency of operation is 250KHz, switching time to be that 32uS and general power consumption only are 15mW.
What (6) print module of the utility model electromagnetic relay parameter tester mainly adopted is LASER PP40 printer, and LASER PP40 is a kind of four looks type printers of describing to decline, and it has Text Mode and two kinds of working methods of graphic model.Can be used to describe character and figure, have stronger drawing function.LASER PP40 combines with microprocessor, just can use as miniature draught machine in intelligence instrument and real-time control system.The principal feature of LASER PP40 is as follows: " Centronics " parallel interface of (1) standard.(2) Feng Fu print command, form is simple.(3) support whole ASCII character characters, and control character commonly used.(4) has stronger graphing ability.
(7) display module of the utility model electromagnetic relay parameter tester is selected LCDs 1602LCD.1602LCD is meant that content displayed is 16 * 2, promptly can show two row, 16 character liquid crystal modules of every row, but character display and numeral, be characterized in little power consumption, volume is little, displaying contents is abundant, ultra-thin light and handy ,+3.3V voltage, contrast is adjustable, include reset circuit, show displacement and various control commands are provided, as the multiple function of cls, character blinking and cursor flicker.The 1602LCD LCDs has 80 byte display data memory DDRAM, in have the character generator CGROM of the font of 192 5 * 7 dot matrix, 8 can be by user-defined 5 * 7 character generator CGRAM.
What (8) alarm module of the utility model electromagnetic relay parameter tester adopted is sound and light alarm.When circuit breaks down, relay damaged, test synthesis parameter exceed the preset value scope or situation beyond other occurs, loudspeaker will send sound, and warning circuit will send warning, and the alarm lamp light emitting diode will be luminous simultaneously.
(9) by the step-down transformer step-down, rectification is specific DC voltage to the power module of the utility model electromagnetic relay parameter tester again, for each module provides needed normal working voltage with the AC220V civil power.
(10) effect of the key-press module of the utility model electromagnetic relay parameter tester is that the user can realize different functions by button.Key-press module can be realized the automatic measurement of parameter, also can realize the manual measurement of parameter.Select the automatic button of measuring, system will measure one by one to each parameter, measure one group of just then measurement of circulation, select reset key to stop.After selecting the manual measurement button, the parameter that can need to measure is optionally measured.When alarm moves, can reset by reset key.
(11) effect of the parameter measurement module of the utility model electromagnetic relay parameter tester comprises the measurement of the measurement of relay contact resistance and relay pick-up voltage, release voltage, pickup time, release time five parameters.
(12) because forming module, each of the utility model electromagnetic relay parameter tester have above-mentioned advantage, Control Program for Microcomputers [Digital Research] mainly is to handle from A/D to transmit the digital voltage signal of coming in addition, and by the resistance revision program voltage signal is revised, after the correction voltage signal is converted to resistance value output.If modified value exceeds the preset value scope, select control warning module and report to the police.Revision program is by repeatedly experiment, make final output valve substantially near actual value, the following five kinds of errors that when measuring, cause have been eliminated: the measuring error that lead causes the influence of contact resistance because of circuit parameter, the measuring error that temperature causes the influence of contact resistance, the constant current source error, the error that the sum of errors A/D conversion of voltage amplifier brings.So just guaranteed the measuring accuracy of the utility model electromagnetic relay parameter tester.
(13) because the utility model electromagnetic relay parameter tester is to be the processing controls core with the single-chip microcomputer, in the measuring accuracy and speed that improve tested electromagnetic relay parameter, the result of comprehensive parameter measuring is adopted liquid crystal display and the output of data printing type, clear reading, convenient and practical.Simultaneously, in the single-chip microcomputer storage unit, deposit the standard comprehensive parameters of relay in advance in, when maloperation or measured relay comprehensive parameters occurring and exceed preset value, will report to the police by alarm module.
(14) the utility model electromagnetic relay comprehensive parameter tester is simple in structure, convenient test, and cost is lower, and used components and parts also all are easy to obtain.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the structured flowchart of the utility model electromagnetic relay comprehensive parameter tester.
Fig. 2 is the constant-current source circuit figure of the utility model electromagnetic relay comprehensive parameter tester.
Fig. 3 is the warning circuit figure of the utility model electromagnetic relay comprehensive parameter tester.
Fig. 4 is the power circuit diagram of the utility model electromagnetic relay comprehensive parameter tester.
Fig. 5 is release voltage, pick-up voltage, pickup time and the release time metering circuit figure of the utility model electromagnetic relay comprehensive parameter tester.
Fig. 6 is the measuring contact resistance circuit diagram of the utility model electromagnetic relay comprehensive parameter tester.
Fig. 7 is that the key-press module of the utility model electromagnetic relay comprehensive parameter tester constitutes synoptic diagram.
Fig. 8 is the reseting module synoptic diagram of the utility model electromagnetic relay comprehensive parameter tester.
Fig. 9 is the testing total program flow diagram of the utility model electromagnetic relay comprehensive parameter tester.
Figure 10 is the utility model electromagnetic relay comprehensive parameter tester interrupt routine process flow diagram.
Figure 11 is the utility model electromagnetic relay comprehensive parameter tester reset routine process flow diagram.
Embodiment
Embodiment illustrated in fig. 1 showing, the utility model electromagnetic relay comprehensive parameter tester comprises constant current source module, system controlled by computer module, reseting module, amplification module, A/D modular converter, print module, display module, alarm module, power module, key-press module and parameter measurement module; The constant current source module links to each other with the parameter measurement module, the parameter measurement module links to each other with amplification module again, amplification module links to each other with the A/D modular converter again, the A/D modular converter links to each other with the system controlled by computer module again, the system controlled by computer module also links to each other with print module, display module, alarm module, key-press module and reseting module, and power module links to each other with each module of this tester.
Embodiment illustrated in fig. 2 showing, the formation of the constant-current source circuit of the utility model electromagnetic relay comprehensive parameter tester is: resistance value is one termination+12V voltage of the slide rheostat R1 of 1K, emitter and the ground connection of another termination triode BUT-11A, the end that the middle sliding point connecting resistance value of this slide rheostat R1 is the resistance R 2 of 27K, the other end of resistance R 2 links to each other with the base stage of triode BUT-11A, the collector of triode BUT-11A and resistance value are that an end of the resistance R 3 of 10K links to each other, the other end of resistance R 3 is connected to the port 2 of accurate amplifier OP27 and an end of the resistance R 8 that resistance value is 1K simultaneously, the other end of resistance R 8 links to each other with resistance R L, RL other end ground connection, resistance value is an end ground connection of the resistance R 4 of 10K, the other end of resistance R 4 connects the port 3 of accurate amplifier OP27 and an end of the resistance R 7 that resistance value is 1K simultaneously, the port one of accurate amplifier OP27 and resistance value are that an end of the resistance R 5 of 1K links to each other, the port 8 of accurate amplifier OP27 connects+12V voltage, port 4 ground connection of accurate amplifier OP27, the other end of resistance R 5 and model are that the base stage of the triode Q1 of TIP122 links to each other, the emitter of triode Q1 and model are that the base stage of the triode Q2 of TIP122 links to each other, the emitter of triode Q2 and model are that the base stage of the triode Q3 of TIP122 links to each other, the collector of triode Q3 links to each other with the collector of the collector of triode Q2 and triode Q1 and is that the resistance R 6 of 5.1K connects+12V voltage through resistance value, the emitter of triode Q3 links to each other with resistance R 7, and obtains electric current I at the emitter of triode Q3 and the other end connecting place of resistance R 7.Triode Q1 among Fig. 2, triode Q2 and triode Q3 form so-called Darlington transistor.
Constant-current source circuit shown in Figure 2 is the constant current source module, Fig. 2 shows, the constant current source module comprises load module and V/I modular converter, described load module is that the slide rheostat of 1K and BUT-11A type triode are formed and carried one+12V D.C. regulated power supply by resistance, and the V/I modular converter is made of with the Darlington circuit that TIP122 transistor Q1, TIP122 transistor Q2 and TIP122 transistor Q3 form accurate amplifier OP27.
Embodiment illustrated in fig. 3 showing, the formation of the warning circuit of the utility model electromagnetic relay comprehensive parameter tester is: two branch roads of this circuit are connected on the two ends of loudspeaker respectively, wherein a branch road that connects one-chip machine port P2.0 is: model is the end that the resistance R 30 of one 300 Ω of light emitting diode D3 series connection of IN4003 is connected on loudspeaker LS1, this end also meets power supply VCC simultaneously, another branch road that connects one-chip machine port P2.1: model of resistance R 7 series connection that resistance value is 10K is the base stage of 9013 triode Q2, the collector of this triode is connected the other end of loudspeaker LS1, the grounded emitter of this triode.
Embodiment illustrated in fig. 4 showing, the formation of the power circuit of the utility model electromagnetic relay comprehensive parameter tester is: AV220V voltage is behind a transformer T1, step-down is AC15V, being IN4001 with one group of model then, full-bridge rectification diode D5 links to each other, be divided into three branch roads afterwards, article one, branch road and capacity are that capacitor C 5 backs in parallel and the model of 2200 μ are that the voltage stabilizer U11 input end of LM7812 is connected, voltage stabilizer U11 output terminal and capacity are to be that the voltage stabilizer U12 input end of LM7805 links to each other with model again after capacitor C 6 parallel connections of 0.1 μ, output terminal one end output+5V voltage after the capacitor C 7 that voltage stabilizer U12 capacity in parallel again is 0.1 μ, other end ground connection; Second branch road and capacity are to be that the voltage stabilizer U13 input end of LM7812 links to each other with model again after capacitor C 8 parallel connections of 2200 μ, and voltage stabilizer U13 is after the shunt capacitance capacity is the C9 of 0.1 μ again, output terminal output-12V voltage, other end ground connection; Article three, branch road and capacitance are to be that the voltage stabilizer U14 input end of LM7805 links to each other with model after the C10 parallel connection of 2200 μ, and voltage stabilizer U14 shunt capacitance capacity again is the capacitor C 11 back output VCC of 0.1 μ, other end ground connection.
Embodiment illustrated in fig. 5 showing, the release voltage of the utility model electromagnetic relay comprehensive parameter tester, pick-up voltage, pickup time and release time metering circuit formation be: the port one of potentiometer X9313 and port 2 meet the port P1.0 and the port P1.1 of single-chip microcomputer respectively, port 4 ground connection of potentiometer X9313, the port 8 of potentiometer X9313 connects power supply, the port 5 of potentiometer X9313 is received on the port 3 of OP07, the port 3 of potentiometer X9313, port 6 and port 7 are unsettled, the port 5 of OP07 connects-15V voltage, the port 7 of OP07 connects+15V voltage, the port 6 of OP07 is succeeded the end of electrical equipment J, the port 2 of OP07 and model are that the diode cathode of IN4148 links to each other, the port 8 of OP07 is unsettled, model is that the diode cathode of IN4148 links to each other with the other end of relay J and ground connection, the end of relay coil S7 is through a 1K resistance eutral grounding, the port 3 of another termination LM358N of relay coil S7, the port 4 of LM358N connects-12V voltage, the port 8 of LM358N connects+12V voltage, the port 2 of LM358N links to each other with port one, receives on the D/A converter.
Embodiment illustrated in fig. 6 showing, the formation of the measuring contact resistance circuit of the utility model electromagnetic relay comprehensive parameter tester is: the constant current source output terminal links to each other with an end of relay contact, the other end of relay contact is connected to LM358N port 3, the port 4 of LM358N connects-12V voltage, the port 8 of LM358N connects+12V voltage, the port one of LM358N links to each other with port 2 and is connected on the port 3 of OP07, the port 5 of OP07 connects-15V voltage, the port 7 of OP07 connects+15V voltage, the end of the port 2 connecting resistance R15 of OP07, the other end of resistance R 15 is with an end ground connection of resistance R 16, the port 6 of OP07 is connected to A/D converter with the other end 6 of resistance R 1, and the port 8 of OP07 is unsettled.
Embodiment illustrated in fig. 7 showing, the key-press module of the utility model electromagnetic relay comprehensive parameter tester is provided with automatic measurement button, reset key and manual measurement button.Automatic keying is S1, and manually button is respectively S2, S3, S4 and S5.Its connected mode is: automatic keying is that the port P1.6 that the end of S1 is connected to single-chip microcomputer connects the end that resistance value is the resistance R 1 of 10K simultaneously, manually the end of button S2, S3, S4 and S5 is connected respectively to port P1.5, P1.4, P1.3 and the P1.2 of single-chip microcomputer, is that an end of resistance R 2, resistance R 3, resistance R 4 and the resistance R 5 of 10K resistance is connected with resistance value respectively simultaneously; The equal ground connection of the other end of all buttons; The other end of all resistance links to each other with power supply VCC.
Embodiment illustrated in fig. 8 showing, the formation of the reseting module of the utility model electromagnetic relay comprehensive parameter tester is: reset key S6 one termination model is the positive pole of the diode D6 of IN4148, the positive pole of this diode D6 is that an end of the capacitor C 3 of 0.01 μ links to each other with one-chip machine port RST with capacitance, diode D6 negative pole meets power supply VCC simultaneously and resistance value is an end of the resistance R 1 of 10K, the other end of this resistance R 1 is the capacitor C 12 back ground connection of 22 μ by capacitance, and the other end of reset key S6 links to each other with the other end of above-mentioned capacitor C 3.
Embodiment illustrated in fig. 9 showing, the testing total program circuit of the utility model electromagnetic relay comprehensive parameter tester is:
System initialization → timer initialization → interruption initialization → have button to press?
The retrieval system initialization;
System initialization → timer initialization → interruption initialization → have button to press?
The retrieval system initialization;
It is function button?
It is reset key?
The retrieval system initialization;
Display parameter;
It is the PV key?
Interrupt routine 1 → end;
It is the RV key?
Interrupt routine 2 → end;
It is the PT key?
Interrupt routine 3 → end;
It is the RT key?
Interrupt routine 4 → end;
It is the CR key?
Interrupt routine 5 → end;
Display subroutine → display parameter → end → retrieval system initialization.
Embodiment illustrated in fig. 10 showing, the flow process of the interrupt routine of the utility model electromagnetic relay comprehensive parameter tester is: does interrupt routine begin → judges Flag=1?
Calling FUN1 function → interrupt routine finishes;
Do you judge Flag=2?
Calling FUN2 function → interrupt routine finishes;
Do you judge Flag=3?
Calling FUN3 function → interrupt routine finishes;
Do you judge Flag=4?
Calling FUN4 function → interrupt routine finishes;
Do you judge Flag=5?
Calling FUN5 function → interrupt routine finishes;
Interrupt routine finishes.
Embodiment illustrated in fig. 11 showing, the reset routine flow process of the utility model electromagnetic relay comprehensive parameter tester: reset routine begins → program initialization → judge that parameter exceeds preset value?
Does the automatically reset time reach preset value?
Automatically reset → finish,
Wait for next bar instruction;
Is there reset key to press?
The retrieval system initialization;
Hand-reset → end.
Constitute the electromagnetic relay comprehensive parameter tester of present embodiment according to above-mentioned Fig. 1～embodiment shown in Figure 11.Wherein, the operational amplifier in the amplification module adopts OP07; Adopt the A/D conversion chip ADC0832 of 8 bit resolutions in the A/D modular converter; The system controlled by computer module mainly is made up of single-chip microcomputer and SCM peripheral circuit, and this single-chip microcomputer is selected AT89C51 for use; Display module is selected LCDs LCD1602; Adopt LASER PP40 printer in the print module; Key-press module is provided with automatic measurement button, reset key and manual measurement button.
Carry out the comprehensive parameters of HH52P electromagnetic relay with above-mentioned electromagnetic relay comprehensive parameter tester, comprise the measurement of the measurement of relay contact resistance and relay pick-up voltage, release voltage, pickup time, release time five parameters.
The measuring process of contact resistance is: constant current source is connected with relay.By Ohm law R=U/I as can be known, electric current is constant, as long as voltage measurement is come out, divided by current source current, just can obtain contact resistance.The contact both end voltage through an amplifier, is amplified to the scope that single-chip microcomputer can be handled.Wherein need analog voltage signal is converted to digital voltage signal.
Relay pick-up voltage, release voltage, pickup time and release time measuring process be: produce a pulse, pass to potentiometer.When pulse was high level, voltage was just from little continuous increase, and when having arrived certain voltage value, relay status will become closure by disconnection, and relay is adhesive automatically just, and the voltage of this moment is exactly pick-up voltage.The needed time is exactly pickup time from the off-state to the closure state.Just constantly send signal to single-chip microcomputer when beginning from applying voltage, the magnitude of voltage when single-chip microcomputer can receive closure is also noted, and timer also can write down pickup time.When pulse was low level, voltage was just from greatly constantly reducing, and when having arrived certain voltage value, relay status will become disconnection by closure, and relay just discharges automatically, and the voltage of this moment is exactly release voltage.The needed time is exactly release time from the closure state to the off-state.Just constantly send signal to single-chip microcomputer when beginning from applying voltage, single-chip microcomputer can receive the magnitude of voltage when disconnecting and note, and timer also can write down release time.
For reducing error, test divides to be carried out for 10 times, and probe temperature is 20 ℃, and testing humidity is 80%, and other known conditions are ideal conditions.It is as follows to test resulting each parameter: 10 pick-up voltages (V) are respectively: 20.62,20.57,20.53,20.64,20.49,20.59,20.55,20.71,20.60,20.58; 10 release voltages (V) are respectively: 2.43,2.44,2.42,2.46,2.56,2.60,2.52,2.59,2.48,2.49; Be respectively 10 pickup time (ms): 34.70,34.82,34.90,34.75,34.80,34.78,34.83,34.80,34.84,34.79; Be respectively 10 release time (ms): 28.58,28.62,28.12,28.45,28.70,28.50,28.85,28.23,28.52,28.43; 10 contact resistances (m Ω) are respectively: 54.80,53.00,49.40,55.00,46.60,50.30,52.60,57.70,50.40,47.50.
Average respectively, the pick-up voltage that obtains tested HH52P electromagnetic relay is 20.588V, and release voltage is 2.499V, and be 34.801ms pickup time, and be 28.500ms release time, and contact resistance is 52.030m Ω.
Claims (10)
1. the electromagnetic relay comprehensive parameter tester is characterized in that: comprise constant current source module, system controlled by computer module, reseting module, amplification module, A/D modular converter, print module, display module, alarm module, power module, key-press module and parameter measurement module; The constant current source module links to each other with the parameter measurement module, the parameter measurement module links to each other with amplification module again, amplification module links to each other with the A/D modular converter again, the A/D modular converter links to each other with the system controlled by computer module again, the system controlled by computer module also links to each other with print module, display module, alarm module, key-press module and reseting module, and power module links to each other with each module of this tester.
2. according to the said electromagnetic relay comprehensive parameter tester of claim 1, it is characterized in that: described constant current source module is a constant-current source circuit, comprise load module and V/I modular converter, described load module is that the slide rheostat of 1K and BUT-11A type triode are formed and carried one+12V D.C. regulated power supply by resistance, and the V/I modular converter is made of with the Darlington circuit that TIP122 transistor Q1, TIP122 transistor Q2 and TIP122 transistor Q3 form accurate amplifier OP27.
3. according to the said electromagnetic relay comprehensive parameter tester of claim 1, it is characterized in that: described alarm module is to be made of sound light alarming circuit, two branch roads of this circuit are connected on the two ends of loudspeaker respectively, wherein branch road is the end that the resistance of one 300 Ω of light emitting diode series connection is connected on loudspeaker, this end also meets power supply VCC, another branch road is the base stage of the resistance series connection triode of a 10K, the collector of this triode is connected the other end of loudspeaker, the grounded emitter of this triode.
4. according to the said electromagnetic relay comprehensive parameter tester of claim 1, it is characterized in that: described power module is a power circuit, comprises that 1 no-load voltage ratio is 220/15 transformer, 4 one group of full rectifier bridge, 4 voltage stabilizers, 3 electrochemical capacitors and 4 common electric capacity compositions that diode is formed; AV220V voltage is behind a transformer T1, step-down is AC15V, being IN4001 with one group of model then, full-bridge rectification diode D5 links to each other, be divided into three branch roads afterwards, article one, branch road and capacity are that capacitor C 5 backs in parallel and the model of 2200 μ are that the voltage stabilizer U11 input end of LM7812 is connected, voltage stabilizer U11 output terminal and capacity are to be that the voltage stabilizer U12 input end of LM7805 links to each other with model again after capacitor C 6 parallel connections of 0.1 μ, output terminal one end output+5V voltage after the capacitor C 7 that voltage stabilizer U12 capacity in parallel again is 0.1 μ, other end ground connection; Second branch road and capacity are to be that the voltage stabilizer U13 input end of LM7812 links to each other with model again after capacitor C 8 parallel connections of 2200 μ, and voltage stabilizer U13 is after the shunt capacitance capacity is the C9 of 0.1 μ again, output terminal output-12V voltage, other end ground connection; Article three, branch road and capacitance are to be that the voltage stabilizer U14 input end of LM7805 links to each other with model after the C10 parallel connection of 2200 μ, and voltage stabilizer U14 shunt capacitance capacity again is the capacitor C 11 back output VCC of 0.1 μ, other end ground connection.
5. according to the said electromagnetic relay comprehensive parameter tester of claim 1, it is characterized in that: described parameter measurement module comprises two circuit: the one, and release voltage, pick-up voltage, the metering circuit of pickup time and release time, the 2nd, the measuring contact resistance circuit, release voltage wherein, pick-up voltage, the formation of the metering circuit of pickup time and release time is: the port one of potentiometer X9313 and port 2 meet the port P1.0 and the port P1.1 of single-chip microcomputer respectively, port 4 ground connection of potentiometer X9313, the port 8 of potentiometer X9313 connects power supply, the port 5 of potentiometer X9313 is received on the port 3 of OP07, the port 3 of potentiometer X9313, port 6 and port 7 are unsettled, the port 5 of OP07 connects-15V voltage, the port 7 of OP07 connects+15V voltage, the port 6 of OP07 is succeeded the end of electrical equipment J, the port 2 of OP07 and model are that the diode cathode of IN4148 links to each other, the port 8 of OP07 is unsettled, model is that the diode cathode of IN4148 links to each other with the other end of relay J and ground connection, the end of relay coil S7 is through a 1K resistance eutral grounding, the port 3 of another termination LM358N of relay coil S7, the port 4 of LM358N connects-12V voltage, the port 8 of LM358N connects+12V voltage, the port 2 of LM358N links to each other with port one, receives on the D/A converter; The formation of measuring contact resistance circuit is: the constant current source output terminal links to each other with an end of relay contact, the other end of relay contact is connected to LM358N port 3, the port 4 of LM358N connects-12V voltage, the port 8 of LM358N connects+12V voltage, the port one of LM358N links to each other with port 2 and is connected on the port 3 of OP07, the port 5 of OP07 connects-15V voltage, the port 7 of OP07 connects+15V voltage, the end of the port 2 connecting resistance R15 of OP07, the other end of resistance R 15 is with an end ground connection of resistance R 16, the port 6 of OP07 is connected to A/D converter with the other end 6 of resistance R 1, and the port 8 of OP07 is unsettled.
6. according to the said electromagnetic relay comprehensive parameter tester of claim 1, it is characterized in that: the operational amplifier in the described amplification module adopts OP07.
7. according to the said electromagnetic relay comprehensive parameter tester of claim 1, it is characterized in that: the A/D conversion chip ADC0832 that adopts 8 bit resolutions in the described A/D modular converter.
8. according to the said electromagnetic relay comprehensive parameter tester of claim 1, it is characterized in that: described system controlled by computer module mainly is made up of single-chip microcomputer and SCM peripheral circuit, and this single-chip microcomputer is selected AT89C51 for use.
9. according to the said electromagnetic relay comprehensive parameter tester of claim 1, it is characterized in that: described display module is selected LCDs LCD1602.
10. according to the said electromagnetic relay comprehensive parameter tester of claim 1, it is characterized in that: described key-press module is provided with automatic measurement button, reset key and manual measurement button.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320131056 CN203101592U (en) | 2013-03-21 | 2013-03-21 | Electromagnetic relay comprehensive parameter test instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320131056 CN203101592U (en) | 2013-03-21 | 2013-03-21 | Electromagnetic relay comprehensive parameter test instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203101592U true CN203101592U (en) | 2013-07-31 |
Family
ID=48852982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320131056 Expired - Fee Related CN203101592U (en) | 2013-03-21 | 2013-03-21 | Electromagnetic relay comprehensive parameter test instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203101592U (en) |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487752A (en) * | 2013-09-26 | 2014-01-01 | 贵州天义汽车电器有限公司 | Electromagnetic relay microcomputer debugging instrument |
| CN104142473A (en) * | 2013-12-20 | 2014-11-12 | 浙江吉利控股集团有限公司 | Performance testing device and testing method for automotive relay |
| CN104155603A (en) * | 2014-08-29 | 2014-11-19 | 一汽-大众汽车有限公司 | Contact detection device and method of high-voltage relay for electric vehicle |
| CN104360265A (en) * | 2014-11-06 | 2015-02-18 | 贵州天义电器有限责任公司 | Multi-switching relay tester |
| CN104914378A (en) * | 2015-06-18 | 2015-09-16 | 苏州工业职业技术学院 | Electromagnetic relay characteristic parameter measuring instrument based on single chip microcomputer |
| CN105487004A (en) * | 2015-11-28 | 2016-04-13 | 中国北车集团大连机车车辆有限公司 | DC contactor or relay closing time test circuit |
| CN105572582A (en) * | 2016-02-29 | 2016-05-11 | 广州地铁集团有限公司 | Method and device based on single-chip microcomputer for testing performance of sealed relay |
| CN105652197A (en) * | 2016-03-13 | 2016-06-08 | 浙江展邦电子科技有限公司 | Portable electromagnetic relay tester with wireless communication function |
| CN105676043A (en) * | 2016-03-31 | 2016-06-15 | 杭州威锐孚源科技有限公司 | Intelligent electric parameter tester and control method thereof |
| CN105866666A (en) * | 2016-03-25 | 2016-08-17 | 哈尔滨工业大学 | Relay-type stand-alone accelerated storage testing device and method |
| CN105866671A (en) * | 2016-06-02 | 2016-08-17 | 佛山市程显科技有限公司 | Magnetic switch general-purpose tester and testing method thereof |
| CN107741562A (en) * | 2017-10-30 | 2018-02-27 | 辽东学院 | A kind of tester of automotive intelligent starter relay |
| CN107966656A (en) * | 2017-11-30 | 2018-04-27 | 蒋小辉 | A kind of matrix form electromagnetic relay intelligent comprehensive parameter detection device |
| CN109342939A (en) * | 2018-11-29 | 2019-02-15 | 贵州航天计量测试技术研究所 | The actuation release time calibrating installation and method of relay synthetic parameter test system |
| CN109347381A (en) * | 2018-11-19 | 2019-02-15 | 陕西航空电气有限责任公司 | A kind of multimode failure reset processing unit for aviation low pressure dc generator controller |
| CN110426313A (en) * | 2019-09-04 | 2019-11-08 | 上海乐研电气有限公司 | A kind of gas density relay and monitoring system with line diagnosis function |
| CN110488182A (en) * | 2019-08-16 | 2019-11-22 | 哈尔滨工业大学（深圳） | A kind of method, system, device and the storage medium of relay on-line checking and monitoring |
| CN116930644A (en) * | 2023-07-03 | 2023-10-24 | 广州市森正电子科技有限公司 | High-integration-level electrical parameter comprehensive measurement device and method thereof |
-
2013
- 2013-03-21 CN CN 201320131056 patent/CN203101592U/en not_active Expired - Fee Related
Cited By (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487752B (en) * | 2013-09-26 | 2016-02-24 | 贵州天义汽车电器有限公司 | A kind of electromagnetic relay microcomputer debugging instrument |
| CN103487752A (en) * | 2013-09-26 | 2014-01-01 | 贵州天义汽车电器有限公司 | Electromagnetic relay microcomputer debugging instrument |
| CN104142473A (en) * | 2013-12-20 | 2014-11-12 | 浙江吉利控股集团有限公司 | Performance testing device and testing method for automotive relay |
| CN104155603A (en) * | 2014-08-29 | 2014-11-19 | 一汽-大众汽车有限公司 | Contact detection device and method of high-voltage relay for electric vehicle |
| CN104360265B (en) * | 2014-11-06 | 2017-02-22 | 贵州天义电器有限责任公司 | Multi-switching relay tester |
| CN104360265A (en) * | 2014-11-06 | 2015-02-18 | 贵州天义电器有限责任公司 | Multi-switching relay tester |
| CN104914378A (en) * | 2015-06-18 | 2015-09-16 | 苏州工业职业技术学院 | Electromagnetic relay characteristic parameter measuring instrument based on single chip microcomputer |
| CN104914378B (en) * | 2015-06-18 | 2018-03-13 | 苏州工业职业技术学院 | SCM Based electromagnetic relay characterisitic parameter measuring instrument |
| CN105487004A (en) * | 2015-11-28 | 2016-04-13 | 中国北车集团大连机车车辆有限公司 | DC contactor or relay closing time test circuit |
| CN105487004B (en) * | 2015-11-28 | 2018-04-13 | 中国北车集团大连机车车辆有限公司 | D.C. contactor or relay-operating time test circuit |
| CN105572582A (en) * | 2016-02-29 | 2016-05-11 | 广州地铁集团有限公司 | Method and device based on single-chip microcomputer for testing performance of sealed relay |
| CN105572582B (en) * | 2016-02-29 | 2019-06-28 | 广州地铁集团有限公司 | A kind of SCM Based leakproofness relay performance test device |
| CN105652197A (en) * | 2016-03-13 | 2016-06-08 | 浙江展邦电子科技有限公司 | Portable electromagnetic relay tester with wireless communication function |
| CN105652197B (en) * | 2016-03-13 | 2018-08-24 | 浙江展邦电子科技有限公司 | A kind of Portable electromagnetic relay tester with wireless communication function |
| CN105866666A (en) * | 2016-03-25 | 2016-08-17 | 哈尔滨工业大学 | Relay-type stand-alone accelerated storage testing device and method |
| CN105676043A (en) * | 2016-03-31 | 2016-06-15 | 杭州威锐孚源科技有限公司 | Intelligent electric parameter tester and control method thereof |
| CN105866671B (en) * | 2016-06-02 | 2019-07-19 | 佛山市程显科技有限公司 | A kind of magnetic switch comprehensive tester and its test method |
| CN105866671A (en) * | 2016-06-02 | 2016-08-17 | 佛山市程显科技有限公司 | Magnetic switch general-purpose tester and testing method thereof |
| CN107741562A (en) * | 2017-10-30 | 2018-02-27 | 辽东学院 | A kind of tester of automotive intelligent starter relay |
| CN107966656A (en) * | 2017-11-30 | 2018-04-27 | 蒋小辉 | A kind of matrix form electromagnetic relay intelligent comprehensive parameter detection device |
| CN109347381A (en) * | 2018-11-19 | 2019-02-15 | 陕西航空电气有限责任公司 | A kind of multimode failure reset processing unit for aviation low pressure dc generator controller |
| CN109347381B (en) * | 2018-11-19 | 2021-12-28 | 陕西航空电气有限责任公司 | Multi-state fault reset processing device for aviation low-voltage direct-current generator controller |
| CN109342939A (en) * | 2018-11-29 | 2019-02-15 | 贵州航天计量测试技术研究所 | The actuation release time calibrating installation and method of relay synthetic parameter test system |
| CN109342939B (en) * | 2018-11-29 | 2024-04-09 | 贵州航天计量测试技术研究所 | Device and method for calibrating suction and release time of relay comprehensive parameter testing system |
| CN110488182A (en) * | 2019-08-16 | 2019-11-22 | 哈尔滨工业大学（深圳） | A kind of method, system, device and the storage medium of relay on-line checking and monitoring |
| CN110426313A (en) * | 2019-09-04 | 2019-11-08 | 上海乐研电气有限公司 | A kind of gas density relay and monitoring system with line diagnosis function |
| CN116930644A (en) * | 2023-07-03 | 2023-10-24 | 广州市森正电子科技有限公司 | High-integration-level electrical parameter comprehensive measurement device and method thereof |
| CN116930644B (en) * | 2023-07-03 | 2024-03-19 | 广州市森正电子科技有限公司 | High-integration-level electrical parameter comprehensive measurement device and method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203101592U (en) | Electromagnetic relay comprehensive parameter test instrument | |
| CN102611120B (en) | Power factor monitoring and compensating system | |
| CN202075334U (en) | Peak voltage digital display meter | |
| CN207457458U (en) | A kind of accumulator wireless inspection device | |
| CN202057728U (en) | Wide-range high-precision quick test device for direct-current resistance | |
| CN106154044B (en) | Forward dynamic resistance testing apparatus for power diode | |
| CN204964077U (en) | Pressure drag formula pressure sensor pressure detection circuit | |
| CN205844439U (en) | A kind of short interruption detector | |
| CN204881767U (en) | Measure device and car of fuel liquid level | |
| CN201813072U (en) | Wireless sensor network measure and control device for prefabricated substations | |
| CN202837383U (en) | System for batch measurement of battery voltage | |
| CN201163288Y (en) | Power supply voltage detecting circuit | |
| CN102854378B (en) | Current testing circuit | |
| CN205120938U (en) | LED pilot lamp light decay detector | |
| CN204422130U (en) | A kind of gas pressure detection meter | |
| CN204256039U (en) | A kind of voltage check device | |
| CN110907943A (en) | Infrared distance measurement automatic analyzer and data analysis method | |
| CN104181370A (en) | Load current detection circuit and detection device | |
| CN203133161U (en) | Light bar power measurement device | |
| CN203149082U (en) | Photoelectric avalanche diode (APD) automatic parameter tester | |
| CN202057776U (en) | Passive liquid crystal display (LCD) constant-current electronic load | |
| CN204535739U (en) | A kind of data collector | |
| CN104345212A (en) | Electronic type electric energy meter | |
| CN218512239U (en) | Resiliometer circuit based on grating displacement sensing technology | |
| CN215641497U (en) | Dynamic power consumption monitor for equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130731 Termination date: 20160321 |