CN111077444A - Universal test equipment for contactor and relay - Google Patents
Universal test equipment for contactor and relay Download PDFInfo
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- CN111077444A CN111077444A CN201911413238.6A CN201911413238A CN111077444A CN 111077444 A CN111077444 A CN 111077444A CN 201911413238 A CN201911413238 A CN 201911413238A CN 111077444 A CN111077444 A CN 111077444A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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Abstract
The invention discloses a universal testing device for a contactor and a relay, which comprises: an inspection scope and a load box; the inspection tester includes: the inspection instrument comprises a shell, an inspection instrument panel and an inspection instrument circuit board arranged in the shell; be provided with on the inspection appearance panel: the device comprises a load ammeter, a load voltmeter, a coil ammeter, a coil voltmeter, a resistive load selection button group, a tested piece interface, a tested piece coil interface, a power switch button, a resistive load total switch button, an electronic load knob and an electronic load; the circuit board of the inspection tester is provided with: the device comprises a component power supply, a selection switch group, an inspection instrument end plug, a load power supply and a shunt; the load box includes: a load side plug and a resistive load side.
Description
Technical Field
The invention relates to the technical field of aviation equipment testing, in particular to universal testing equipment for a contactor and a relay.
Background
The contactor and the relay are widely applied to the connection between the circuit board and the shell in the accessories of the Russian fighter and the trainer. However, in the repair process of the existing products, the test items of various contactors and relays are different, the test equipment and instruments are different, the required working voltage is different, various loads required by the test are also different, and the conversion between different products is complicated. At present, no device for testing various contactors and relays in the same plane exists in the field of airplane repair.
Disclosure of Invention
In view of the above, the present invention provides a universal testing apparatus for contactors and relays, which has universality and can simultaneously test a plurality of contactors and relays.
The technical scheme of the invention is as follows: a contactor, relay universal test apparatus, comprising: an inspection scope and a load box; the inspection tester includes: the inspection instrument comprises a shell, an inspection instrument panel and an inspection instrument circuit board arranged in the shell; be provided with on the inspection appearance panel: the device comprises a load ammeter, a load voltmeter, a coil ammeter, a coil voltmeter, a resistive load selection button group, a tested piece interface, a tested piece coil interface, a power switch button, a resistive load total switch button, an electronic load knob and an electronic load; the circuit board of the inspection tester is provided with: the device comprises a component power supply, a selection switch group, an inspection instrument end plug, a load power supply and a shunt; the load box includes: a load end plug and a resistive load end;
the selector switch group includes: more than three selection switches; the set of resistive load selection buttons includes: the tester comprises a power switch S1, a load power switch S2 and more than one resistive load switch, wherein the power switch S1 and the load power switch S2 respectively correspond to a power switch button and a resistive load main switch button on a tester panel, and the more than one resistive load switch is provided with corresponding buttons on the tester panel; inspection appearance end plug includes: more than three inspection instrument end plug jacks; the load side plug includes: more than three load end plug jacks which correspond to the inspection instrument end plug jacks one by one; the resistive load terminal includes: a total resistive load K and more than one partial resistive load;
the general test equipment has the following overall connection relationship: the device comprises a tested piece interface, a load power supply and a current divider, wherein the tested piece interface, the load power supply and the current divider are sequentially connected in series to form a loop, the tested piece is connected to the tested piece interface, a load ammeter, a load voltmeter, a coil ammeter and a coil voltmeter are respectively connected with a component power supply, the component power supply respectively supplies power for the load ammeter, the load voltmeter, the coil ammeter and the coil voltmeter, and the load ammeter and the load voltmeter are respectively used for indicating the current and the voltage of the tested piece; the coil ammeter and the coil voltmeter are respectively connected to two ends of a coil interface of the tested piece in parallel, the coil interface of the tested piece is connected with a coil of the tested piece, and the coil ammeter and the coil voltmeter are respectively used for detecting the current and the voltage of the coil of the tested piece; the power switch S1, the resistive load master switch S2 and more than one resistive load switch are respectively and correspondingly connected with one selector switch, each selector switch is correspondingly connected with a corresponding tester end plug jack, each tester end plug jack is correspondingly connected with a load end plug jack, a load end plug jack T2 is connected with one end of a master resistive load K, a load end plug jack T1 is connected with the other end of the master resistive load K, the load end plug jack T1 is connected with a tester end plug jack Z1 through a cable, and more than one resistive load is correspondingly connected with more than one load end plug jack; when a power switch button is pressed, a power switch S1 is attracted with a corresponding selection switch, a part power supply supplies power for the universal detection equipment, when a resistive load main switch button is pressed, a resistive load main switch S2 is attracted with a corresponding selection switch to control a total resistive load K connected with the resistive load main switch to be communicated, and when more than one resistive load switch in a resistive load selection button group is pressed, the corresponding load is selectively communicated;
the electronic load knob is connected with the potentiometer C, the electronic load knob achieves the adjusting effect through the potentiometer A or the potentiometer C, and the electronic load is connected to a circuit connected with the potentiometer C and the three load end plug jacks through three circuits respectively.
Preferably, the resistive load selection button group further includes more than one spare resistive load switch, each spare resistive load switch is correspondingly connected to one selection switch, and each selection switch passes through the inspection instrument end plug jack, the load end plug jack and the electronic load.
Preferably, an indicator lamp is respectively connected in series in a circuit where the power switch S1, the load power switch S2 and the more than one resistive load switches are located, the indicator lamp is turned on to indicate that the circuit where the indicator lamp is located is in a conducting state, and the indicator lamp is turned off to indicate that the circuit where the indicator lamp is located is in a disconnecting state.
Preferably, the device under test interface includes: the interface A and the interface B are connected in parallel and used for connecting two tested pieces with different powers.
Preferably, the inspection scope panel further comprises: the coil voltage adjusting knob is connected in series in a closed loop where a coil interface of the tested piece and a coil voltmeter are located and used for adjusting the coil voltage; the coil voltage adjusting knob is connected with a component power supply through a selection switch J1, and the component power supply supplies power to the coil voltage adjusting knob.
Preferably, the inspection scope panel further comprises: calibration voltmeter terminal and load voltmeter switch, calibration voltmeter terminal and load voltmeter switch are connected with the load voltmeter electricity respectively, work as general test equipment detects the time measuring to the piece of being surveyed, and load voltmeter switch disconnection works as general test equipment does not detect time measuring to the piece of being surveyed, and load voltmeter switch is closed, and the load voltmeter is used for detecting the response voltage drop, when the response voltage drop appears, inserts outside calibration voltmeter through the calibration voltmeter terminal for the calibration load voltmeter.
Preferably, the inspection apparatus further comprises: and the blower M1 and the blower M2 are pressed down to connect the component power supply, and the blower M1 and the blower M2 are started while the component power supply starts to supply power for radiating heat for the inspection tester.
Preferably, the load box further comprises: and the fans M3 and M4 are pressed to turn on the main circuit of the load box while the resistive load main switch button is pressed to start the fans M3 and M4 for radiating heat for the load box.
Has the advantages that:
(1) the universal testing equipment for the contactor and the relay can test various contactors and relays in the same machine, and realizes the multi-purpose functions of load conversion, power supply switching and testing various electric signals.
Drawings
FIG. 1 is a schematic circuit diagram of the inspection apparatus of the present invention.
FIG. 2 is a view of the test panel of the inspection apparatus of the present invention.
Fig. 3 is a schematic circuit diagram of the load box of the present invention.
Wherein, 1-load ammeter, 2-load voltmeter, 3-coil ammeter, 4-coil voltmeter, 5-coil voltage adjusting knob, 6-part power supply, 7-selection switch group, J1-J16-selection switch, 8-resistance load selection button group, 9-inspection instrument end plug, Z1-Z19-inspection instrument end plug jack, 10-tested piece interface, 101-tested piece interface A, 102-tested piece interface B, 11-tested piece coil interface, 12-load voltmeter switch, 13-power switch button, 14-resistance load total switch button, 15-load end plug, T1-T19-load end plug jack, 16-electronic load knob, 17-load power supply, 18-shunt, 19-potentiometer A, 20-potentiometer B, 21-potentiometer C, S1-power switch, S2-resistive load total switch, S3-S14-resistive load switch, S15-S16-standby resistive load switch, 22-electronic load, 23-calibration voltmeter binding post, M1-M4-fan, K-total resistive load, and K1-K12-partial resistive load.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
Example 1:
the embodiment provides a contactor and relay universal test device which can be used for testing various contactors and relays in the same machine.
As shown in fig. 1-3, the universal test apparatus includes: an inspection scope and a load box;
the inspection tester includes: the inspection instrument comprises a shell, an inspection instrument panel and an inspection instrument circuit board arranged in the shell;
be provided with on the inspection appearance panel: the device comprises a load ammeter 1, a load voltmeter 2, a coil ammeter 3, a coil voltmeter 4, a resistive load selection button group 8, a tested piece interface 10, a tested piece coil interface 11, a power switch button 13, a resistive load total switch button 14 and an electronic load knob 16;
the circuit board of the inspection tester is provided with: the component power supply 6, the selection switch group 7, the inspection instrument end plug 9, the load power supply 17 and the shunt 18;
the load box includes: a load terminal plug 15 and a resistive load terminal;
the selector switch group 7 includes: selector switches J1-J16 connected in parallel;
the resistive load selection button group 8 includes: the inspection tester comprises a power switch S1, a load power switch S2, resistive load switches S3-S14 and indicator lamps connected in series in a circuit where each switch is located, wherein the indicator lamps are used for indicating that the circuit where each switch is located is in a conducting state or a disconnecting state, the power switch S1 corresponds to a power switch button 13 on an inspection tester panel, a resistive load main switch S2 corresponds to a resistive load main switch button 14 on the inspection tester panel, and the resistive load switches S3-S14 are provided with corresponding buttons on the inspection tester panel; the inspection scope terminal plug 9 includes: the inspection instrument end plug jacks Z1-Z19 are connected in parallel; the device under test interface 10 includes: the device comprises a tested piece interface A101 and a tested piece interface B102 which are connected in parallel and used for connecting two tested pieces (contactors or relays) with different powers;
the load side plug 15 includes: load end plug jacks T1-T19 connected in parallel with each other; the resistive load terminal includes: and the total resistive load K and the partial resistive loads K1-K12 are connected in parallel.
The general test equipment has the following overall connection relationship: the tested piece interface 10, the load power supply 17 and the shunt 18 are connected in series to form a loop, and the tested piece is connected to the tested piece interface 10; the load ammeter 1, the load voltmeter 2, the coil ammeter 3 and the coil voltmeter 4 are respectively connected with the component power supply 6, the component power supply 6 respectively supplies power for the load ammeter 1, the load voltmeter 2, the coil ammeter 3 and the coil voltmeter 4, the load ammeter 1 and the load voltmeter 2 are respectively used for detecting the shunt current and the shunt voltage of the shunt 18, and the relation is converted according to a preset coefficient in the load ammeter 1 and the load voltmeter 2, so that the current and the voltage of a detected piece are indicated; the coil interface 11 of the tested piece is connected with a coil of the tested piece, and the coil ammeter 3 and the coil voltmeter 4 are respectively used for detecting the current and the voltage of the coil of the tested piece;
one ends of selection switches J1-J16 are respectively in one-to-one correspondence with a power switch S1, a resistive load master switch S2, resistive load switches S3-S14 and standby resistive load switches S15-S16, and the selection switches J2-J16 are in one-to-one correspondence with plug jacks Z2-Z16 at the end of the inspection tester; the tester end plug jacks Z2-Z16 are connected with the load end plug jacks T2-T16 in a one-to-one corresponding mode, the load end plug jack T2 is connected with one end of a total resistive load K, the load end plug jack T1 is connected with the other end of the total resistive load K, the load end plug jack T1 is connected with the tester end plug jack Z1 through a cable, the load end plug jacks T3-T14 are connected with the branch resistive loads K1-K12 in a one-to-one corresponding mode, and the load end plug jacks T15-T16 serve as spare jacks; when the power switch button 13 is pressed, the power switch S1 and the selection switch J1 are attracted, the component power supply 6 supplies power for the universal detection equipment (the load ammeter 1, the load voltmeter 2, the coil ammeter 3 and the coil voltmeter 4 are all electrified), when the resistive load main switch button 14 is pressed, the resistive load main switch S2 and the selection switch J2 are attracted, the connection of a main resistive load K connected with the resistive load main switch is controlled, and when more than one of the resistive load switches S3 to S14 is pressed, the corresponding loads are selectively connected;
the inspection instrument plug jacks Z17-Z19 are connected with potentiometers a19 (all potentiometers in the embodiments are connected through three jacks because all potentiometers have three terminals), the inspection instrument plug jacks Z17-Z19 are connected with the load end plug jacks T17-T19 in a one-to-one correspondence manner, the load end plug jacks T17-T19 are connected with the electronic load knob 16, the electronic load 22 is further connected with a potentiometer C21, the electronic load knob 16 realizes the adjustment function through the potentiometer a19 or the potentiometer C21, the electronic load 22 is respectively connected to a line between the potentiometer C21 and the load end plug jacks T17-T19 through three lines, the potentiometer a19 and the potentiometer C21 are both used for adjusting the size of the electronic load 22, and the potentiometer a and the potentiometer C6342 are not used simultaneously, wherein the adjustable range of the electronic load 22 is 0-10A. The working principle of the universal test equipment is as follows:
firstly, an inspection tester is connected with a load box through a cable (the inspection tester end plug jacks Z1-Z19 in an inspection tester end plug 9 are in one-to-one butt joint with the load end plug jacks T1-T19 in a load end plug 15 through the cable), a power switch button 13 is opened, a power switch S1 corresponding to the power switch is closed, a linkage selection switch J1 is closed, the universal test equipment is powered on for preparation, at the moment, the indication numbers of a load ammeter 1, a load voltmeter 2, a coil ammeter 3 and a coil voltmeter 4 are all '0000', a tested piece is connected into a tested piece interface 10, a tested piece coil is connected into a tested piece coil interface 11, an electronic load knob 16 is adjusted to obtain a load current between 0 and 10A, a resistive load total switch button 14 is pressed down, a total resistive load K is connected (the total resistive load K is used as a total switch of the resistive loads K1-K12 and is used for controlling the resistive loads K1-K12, at the moment, more than one of the partial resistive loads K1-K12 can be started only under the condition that the total resistive load K is switched on, according to the difference of the tested pieces, more than one of resistive load switches S3-S14 can be selected through a resistive load selection button group 8 (when any one of resistive load switches S3-S14 is pressed, corresponding selection switches J3-J14 in a relay group corresponding to the resistive load switch are attracted), the partial resistive loads K1-K12 corresponding to a load box are switched on, the resistive load is connected into the tested pieces for loading test, a coil voltage adjusting knob 5 is adjusted, coil voltage is correspondingly adjusted, when the coil voltage is adjusted to a set value (different set values of different tested pieces), the selection switch J2 is attracted, the indication number of a load current meter 1 is the attraction current of the selection switch J2, the indication number of a load voltmeter 2 is the attraction voltage drop of the selection switch J2, the indication number of the coil voltmeter 3 is the attraction voltage of the selection switch J2, the indication number of the coil ammeter 4 is the pull-in current of the selection switch J2;
when the load capacity of a large relay or a contactor needs to be tested, different resistive loads can be selected by combining the resistive load selection button group 8, and at the moment, the load current is provided by the external load power supply 17;
when the characteristics of pull-in current, pull-in voltage, coil pull-in current and the like of different tested parts are measured, the same machine test of different products can be completed by selecting different coil currents, different resistive loads and different load currents through the method.
Example 2:
on the basis of embodiment 1, the inspection instrument panel further comprises: the coil voltage adjusting knob 5 is connected in series in a closed loop where the coil interface 11 of the tested piece and the coil voltmeter 4 are located, and the coil voltage is adjusted through a potentiometer B20 arranged in the coil voltage adjusting knob 5; the coil voltage adjusting knob 5 is connected to the component power supply 6 through the selection switch J1, and the component power supply 6 supplies power to the coil voltage adjusting knob 5.
Example 3:
on the basis of embodiment 1 or 2, the inspection scope panel further comprises: calibration voltmeter terminal 23 and load voltmeter switch 12, calibration voltmeter terminal 23 and load voltmeter switch 12 are connected with load voltmeter 2 electricity respectively, when this general test equipment detects the piece that is surveyed, load voltmeter switch 12 disconnection, when this general test equipment does not detect the piece that is surveyed, load voltmeter switch 12 is closed, load voltmeter 2 is used for detecting the response voltage drop, when the response voltage drop appears, insert outside calibration voltmeter through calibration voltmeter terminal 23, be used for calibrating load voltmeter 2.
Example 4:
on the basis of embodiment 1 or 2 or 3, the inspection apparatus further comprises: fan M1 and fan M2, fan M1 and fan M2 are connected in parallel and then are connected in parallel with the inspection instrument panel and the load box, power switch button 13 is pressed to communicate with component power supply 6, and component power supply 6 starts to supply power, namely, fan M1 and fan M2 are started simultaneously for radiating heat for the inspection instrument.
Example 5:
on the basis of any one of embodiments 1 to 4, the load box further includes: the fan M3 and the fan M4, the fan M3 and the fan M4 are connected in parallel and then connected between two circuits connected with the load end plug jacks T15-T16 and the electronic load 22, and when the resistive load master switch button 14 is pressed to conduct a load box master circuit, the fan M3 and the fan M4 are started at the same time to radiate heat of the load box.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a contactor, general test equipment of relay which characterized in that includes: an inspection scope and a load box; the inspection tester includes: the inspection instrument comprises a shell, an inspection instrument panel and an inspection instrument circuit board arranged in the shell; be provided with on the inspection appearance panel: the device comprises a load ammeter, a load voltmeter, a coil ammeter, a coil voltmeter, a resistive load selection button group, a tested piece interface, a tested piece coil interface, a power switch button, a resistive load total switch button, an electronic load knob and an electronic load; the circuit board of the inspection tester is provided with: the device comprises a component power supply, a selection switch group, an inspection instrument end plug, a load power supply and a shunt; the load box includes: a load end plug and a resistive load end;
the selector switch group includes: more than three selection switches; the set of resistive load selection buttons includes: the tester comprises a power switch S1, a load power switch S2 and more than one resistive load switch, wherein the power switch S1 and the load power switch S2 respectively correspond to a power switch button and a resistive load main switch button on a tester panel, and the more than one resistive load switch is provided with corresponding buttons on the tester panel; inspection appearance end plug includes: more than three inspection instrument end plug jacks; the load side plug includes: more than three load end plug jacks which correspond to the inspection instrument end plug jacks one by one; the resistive load terminal includes: a total resistive load K and more than one partial resistive load;
the general test equipment has the following overall connection relationship: the device comprises a tested piece interface, a load power supply and a current divider, wherein the tested piece interface, the load power supply and the current divider are sequentially connected in series to form a loop, the tested piece is connected to the tested piece interface, a load ammeter, a load voltmeter, a coil ammeter and a coil voltmeter are respectively connected with a component power supply, the component power supply respectively supplies power for the load ammeter, the load voltmeter, the coil ammeter and the coil voltmeter, and the load ammeter and the load voltmeter are respectively used for indicating the current and the voltage of the tested piece; the coil ammeter and the coil voltmeter are respectively connected to two ends of a coil interface of the tested piece in parallel, the coil interface of the tested piece is connected with a coil of the tested piece, and the coil ammeter and the coil voltmeter are respectively used for detecting the current and the voltage of the coil of the tested piece; the power switch S1, the resistive load master switch S2 and more than one resistive load switch are respectively and correspondingly connected with one selector switch, each selector switch is correspondingly connected with a corresponding tester end plug jack, each tester end plug jack is correspondingly connected with a load end plug jack, a load end plug jack T2 is connected with one end of a master resistive load K, a load end plug jack T1 is connected with the other end of the master resistive load K, the load end plug jack T1 is connected with a tester end plug jack Z1 through a cable, and more than one resistive load is correspondingly connected with more than one load end plug jack; when a power switch button is pressed, a power switch S1 is attracted with a corresponding selection switch, a part power supply supplies power for the universal detection equipment, when a resistive load main switch button is pressed, a resistive load main switch S2 is attracted with a corresponding selection switch to control a total resistive load K connected with the resistive load main switch to be communicated, and when more than one resistive load switch in a resistive load selection button group is pressed, the corresponding load is selectively communicated;
the electronic load knob is connected with the potentiometer C, the electronic load knob achieves the adjusting effect through the potentiometer A or the potentiometer C, and the electronic load is connected to a circuit connected with the potentiometer C and the three load end plug jacks through three circuits respectively.
2. The contactor-relay universal test device as claimed in claim 1, wherein the resistive load selection button set further comprises more than one backup resistive load switch, each backup resistive load switch is connected to a corresponding selection switch, and each selection switch passes through the tester-side plug jack, the load-side plug jack and the electronic load.
3. The universal testing equipment for contactors and relays as claimed in claim 1, wherein said power switch S1, load power switch S2 and more than one resistive load switches are connected in series with an indicator light in a circuit, the indicator light is on for indicating that the circuit is in a conducting state, and the indicator light is off for indicating that the circuit is in a disconnecting state.
4. The contactor, relay universal test apparatus as claimed in claim 1, wherein said device under test interface comprises: the interface A and the interface B are connected in parallel and used for connecting two tested pieces with different powers.
5. The contactor, relay universal test apparatus of claim 1, wherein the inspection scope panel further comprises: the coil voltage adjusting knob is connected in series in a closed loop where a coil interface of the tested piece and a coil voltmeter are located and used for adjusting the coil voltage; the coil voltage adjusting knob is connected with a component power supply through a selection switch J1, and the component power supply supplies power to the coil voltage adjusting knob.
6. The contactor, relay universal test apparatus of claim 1, wherein the inspection scope panel further comprises: calibration voltmeter terminal and load voltmeter switch, calibration voltmeter terminal and load voltmeter switch are connected with the load voltmeter electricity respectively, work as general test equipment detects the time measuring to the piece of being surveyed, and load voltmeter switch disconnection works as general test equipment does not detect time measuring to the piece of being surveyed, and load voltmeter switch is closed, and the load voltmeter is used for detecting the response voltage drop, when the response voltage drop appears, inserts outside calibration voltmeter through the calibration voltmeter terminal for the calibration load voltmeter.
7. The contactor, relay universal test apparatus as claimed in claim 1, wherein said inspection tester further comprises: and the blower M1 and the blower M2 are pressed down to connect the component power supply, and the blower M1 and the blower M2 are started while the component power supply starts to supply power for radiating heat for the inspection tester.
8. The contactor, relay universal test apparatus as claimed in claim 2, wherein said load box further comprises: and the fans M3 and M4 are pressed to turn on the main circuit of the load box while the resistive load main switch button is pressed to start the fans M3 and M4 for radiating heat for the load box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911413238.6A CN111077444A (en) | 2019-12-31 | 2019-12-31 | Universal test equipment for contactor and relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911413238.6A CN111077444A (en) | 2019-12-31 | 2019-12-31 | Universal test equipment for contactor and relay |
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|---|---|
| CN111077444A true CN111077444A (en) | 2020-04-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911413238.6A Pending CN111077444A (en) | 2019-12-31 | 2019-12-31 | Universal test equipment for contactor and relay |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111830307A (en) * | 2020-06-05 | 2020-10-27 | 东风柳州汽车有限公司 | Power supply detection interface device of direct current load equipment |
| CN113658827A (en) * | 2021-08-06 | 2021-11-16 | 贵州天义电器有限责任公司 | Multifunctional relay parameter adjusting device |
-
2019
- 2019-12-31 CN CN201911413238.6A patent/CN111077444A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111830307A (en) * | 2020-06-05 | 2020-10-27 | 东风柳州汽车有限公司 | Power supply detection interface device of direct current load equipment |
| CN113658827A (en) * | 2021-08-06 | 2021-11-16 | 贵州天义电器有限责任公司 | Multifunctional relay parameter adjusting device |
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