CN212060482U - Circuit detection device - Google Patents
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- CN212060482U CN212060482U CN201921901254.5U CN201921901254U CN212060482U CN 212060482 U CN212060482 U CN 212060482U CN 201921901254 U CN201921901254 U CN 201921901254U CN 212060482 U CN212060482 U CN 212060482U
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Abstract
The utility model discloses a circuit detection device, which comprises a power interface, a first switch, a second switch, a detection interface, a first voltage conversion circuit, a second voltage conversion circuit, a display meter circuit and a trigger signal generation circuit; the power supply interface is used for accessing an external power supply, and the detection interface is used for connecting the voltage and current measurement circuit board; the input end of the first voltage conversion circuit is electrically connected with the power interface through a first switch, the output end of the first voltage conversion circuit is electrically connected with the detection interface, and the display meter circuit is connected to a passage through which the output end of the first voltage conversion circuit is electrically connected with the measurement interface; the input end of the second voltage conversion circuit is electrically connected with the power interface through a second switch, and the output end of the second voltage conversion circuit is electrically connected with the detection interface through the trigger signal generation circuit. The device can perform off-line detection on the voltage and current measuring circuit board, and improves the fault processing efficiency and safety.
Description
Technical Field
The embodiment of the utility model provides a relate to the electronic circuit technique, especially relate to a circuit detection device.
Background
With the development of science and technology and the improvement of environmental protection consciousness of people, clean energy is more and more widely applied, wherein wind power generation has huge development potential because the wind is renewable, pollution-free and large-reserve energy.
A driving circuit board of a converter in a wind turbine often works in severe natural environments such as thunderstorm, tripping, strong wind, salt fog and the like and in a power grid environment, a voltage and current measuring circuit board is easy to have operation faults, and fault detection is needed to be carried out on the voltage and current measuring circuit board to ensure the performance of the voltage and current measuring circuit board.
The detection of traditional voltage and current measurement circuit board usually adopts the universal meter to carry out static detection, and direct mount detects in wind turbine generator system's frequency conversion cabinet sometimes, and detection efficiency is lower, and brings very big danger for wind turbine generator system's safe operation.
SUMMERY OF THE UTILITY MODEL
Based on this, to above-mentioned technical problem, the utility model provides a circuit detection device can improve the efficiency and the security that detect for carrying out the off-line detection to voltage current measurement circuit board.
In a first aspect, an embodiment of the present invention provides a circuit detection device, which is applied to detecting a voltage and current measurement circuit board, and includes a first circuit component and a second circuit component, where the first circuit component includes a power interface, a first switch, a second switch and a detection interface, and the second circuit component includes a first voltage conversion circuit, a second voltage conversion circuit, a display meter circuit and a trigger signal generation circuit;
the power supply interface is used for being connected with an external power supply, and the detection interface is used for being connected with the voltage and current measurement circuit board; the input end of the first voltage conversion circuit is electrically connected with the power interface through the first switch, the output end of the first voltage conversion circuit is electrically connected with the detection interface, and the display meter circuit is connected to a path through which the output end of the first voltage conversion circuit is electrically connected with the measurement interface; the input end of the second voltage conversion circuit is electrically connected with the power interface through the second switch, and the output end of the second voltage conversion circuit is electrically connected with the detection interface through the trigger signal generation circuit.
Above-mentioned circuit detection device can realize the off-line measuring to voltage current measurement circuit board performance, avoids directly having improved the security that detects with wind turbine generator system as testing platform, and for adopting the universal meter to carry out the mode that static detection was carried out to current measurement circuit board, can improve fault detection's efficiency.
In one embodiment, the display meter circuit comprises:
the voltmeter is connected in parallel at two ends of the output interface of the first voltage conversion circuit;
and the ammeter is connected in series on a passage electrically connected with the measurement interface and the positive voltage output end of the first voltage conversion circuit output interface.
In one embodiment, the trigger circuit comprises a PWM wave signal generator, a first resistor and a two-stage switch; the input ends of the PWM wave signal generator and the first resistor are electrically connected with the output end of the second voltage conversion circuit, the output ends of the PWM wave signal generator and the first resistor are respectively electrically connected with two input ends of the two-gear switch, and the output ends of the two-gear switch are electrically connected with the detection interface.
In one embodiment, the circuit detection apparatus further includes:
the analog voltage circuit and the analog current circuit are electrically connected with the power interface through the third switch, and the output interfaces of the analog voltage circuit and the analog current circuit are electrically connected with the detection interface.
In one embodiment, the analog voltage circuit comprises a first potentiometer and an adjusting knob; the analog current circuit comprises a second potentiometer, a transformer and an adjusting knob.
In one embodiment, the first potentiometer and the second potentiometer are WTH (118)2M2-2W potentiometers; the transformer is a power frequency transformer with the transformation ratio of 100: 1.
In one embodiment, the circuit detection apparatus further includes:
the main switch is connected in series on a path electrically connected with the first switch and the power interface;
and the indicating lamp is connected to a path electrically connected with the main switch and the first switch.
In one embodiment, the main switch is an air switch and the first switch is a boat switch.
In one embodiment, the circuit detection apparatus further includes:
the first fuse is connected in series with a path of the live wire of the external power supply interface and the first switch in electric connection;
the second fuse is connected in series with a path electrically connected with the measurement interface and the positive voltage output end of the first voltage conversion circuit;
and the third fuse is connected in series with a passage electrically connected with the external measurement interface and the negative voltage output end of the first voltage conversion circuit.
In one embodiment, the circuit detection device further comprises a box body and a box cover, the first circuit component is arranged on the surface of the box body, and the second circuit component is arranged inside the box body; the case lid with the box rotates to be connected, first circuit assembly set up in on the same face of box, the case lid is used for covering the box is provided with first circuit assembly's surface.
Drawings
FIG. 1 is a block diagram of a circuit detection device according to one embodiment;
FIG. 2 is a schematic circuit diagram of an exemplary embodiment of a circuit detecting device;
FIG. 3 is a schematic diagram of the circuit connection of the circuit board for measuring voltage and current detected by the circuit detecting device according to an embodiment;
FIG. 4 is a schematic diagram illustrating a top view of a circuit testing device according to another embodiment;
FIG. 5 is a diagram illustrating an external structure of the circuit detecting apparatus according to an embodiment.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a block diagram of a circuit detection apparatus in an embodiment, as shown in fig. 1, in an embodiment, a circuit detection apparatus 100 is applied to detect a voltage and current measurement circuit board, the circuit detection apparatus 100 includes a first circuit component and a second circuit component, the first circuit component includes a power interface 110, a first switch 122, a second switch 124 and a detection interface 180, the second circuit component includes a first voltage conversion circuit 130, a second voltage conversion circuit 140, a display meter circuit 150 and a trigger signal generation circuit 160; the power interface 110 is used for accessing an external power supply, and the detection interface 180 is used for connecting the voltage and current measurement circuit board; the input end of the first voltage conversion circuit 130 is electrically connected to the power interface 110 through the first switch 122, the output end of the first voltage conversion circuit 130 is electrically connected to the detection interface 180, and the display meter circuit 150 is connected to a path through which the output end of the first voltage conversion circuit 130 is electrically connected to the measurement interface; the input end of the second voltage conversion circuit 140 is electrically connected to the power interface 110 through the second switch 124, and the output end of the second voltage conversion circuit 140 is electrically connected to the detection interface 180 through the trigger signal generation circuit 160.
Specifically, in the circuit detection device 100, the external power source is connected to the first voltage conversion circuit 130 and the second voltage conversion circuit 140 through the first switch 122 and the second switch 124, respectively, and a user or an operator can control the operation states of the first voltage conversion circuit 130 and the second voltage conversion circuit 140 by controlling the on/off of the first switch 122 and the second switch 124. The first voltage conversion circuit 130 converts the voltage of the input external power source into a first direct current voltage. The second voltage conversion circuit 140 converts the voltage of the input external power source into a second direct current voltage. The first dc voltage and the second dc voltage are respectively connected to the detection interface 180 through the display meter circuit 150 and the trigger signal generating circuit 160, and the detected voltage and current measuring circuit board is also connected to the detection interface 180. The first direct current voltage may be used to supply power to the voltage and current measurement circuit board to be tested, the display meter circuit 150 may display data such as supply voltage and current of the voltage and current measurement circuit board to be detected, so as to ensure that the power supply of the circuit board supplies power under normal conditions, and the second direct current voltage may generate a trigger signal for testing the voltage and current measurement circuit board through the trigger signal generation circuit 160.
Further, the external power source may be a commercial power or an external battery, and the power interface 210 may be a delta-shaped socket, and may be electrically connected to the live line L, the zero line N, and the ground line of the commercial power, respectively. The first voltage conversion circuit 130 and the second voltage conversion circuit 140 may be switching power supplies, and the switching power supplies used by the first voltage conversion circuit 130 and the second voltage conversion circuit 140 may include a rectification circuit and a dc voltage reduction circuit, and the dc voltage reduction circuit may specifically include a flyback circuit or a forward circuit, and the like. The display meter circuit 150 may include a plurality of voltage meters and current meters, and the like, so as to display data of the multi-channel measuring circuit of the voltage and current measuring circuit board. The detection interface 180 may include a plurality of connection terminals, each circuit is connected to a corresponding connection terminal, and the monitoring interface 180 may further be connected to a test instrument such as an oscilloscope.
Above-mentioned circuit detection device can realize the off-line measuring to voltage current measurement circuit board performance, avoids directly having improved the security that detects with wind turbine generator system as testing platform, and for adopting the universal meter to carry out the mode that static detection was carried out to current measurement circuit board, can improve fault detection's efficiency.
Fig. 2 is a schematic diagram of a circuit structure of a circuit detection device in an embodiment, as shown in fig. 2, based on the above technical solution, the circuit detection device 200 includes a power interface 210, a first switch 222, a second switch 224, a detection interface 280, a first voltage conversion circuit 230, a second voltage conversion circuit 240, a display table circuit 250, and a trigger signal generation circuit 260, which may be respectively the same as the corresponding structures in the above embodiments, in this embodiment, the circuit detection device 200 further includes an analog voltage circuit 272 and an analog current circuit 274, an input end of the analog voltage circuit 272 and an input end of the analog current circuit 274 are electrically connected to the power interface 210 through the third switch 226, and output interfaces of the analog voltage circuit 272 and the analog current circuit 274 are electrically connected to the detection interface 280.
Specifically, the external power source 210 may be electrically connected to an input terminal of the analog voltage signal circuit 272 through the fourth switch 226, an output terminal of the analog voltage signal circuit 272 is electrically connected to a corresponding terminal of the detection interface 280, the external power source is also electrically connected to an input terminal of the analog current signal circuit 274 through the fourth switch 226, and an output terminal of the analog current signal circuit 274 is electrically connected to a corresponding terminal of the detection interface 280. The analog voltage signal circuit 272 and the analog current signal circuit 274 may respectively simulate a test voltage signal and a test current signal of a certain value, and the test voltage signal and the test current signal may respectively access the voltage measuring circuit and the current measuring circuit of the voltage current measuring circuit board through the detection interface 280. Whether the tested measuring circuit works normally can be determined by adjusting the magnitude of the test voltage signal output by the analog voltage signal circuit 272 or the test current signal output by the analog current signal circuit 274 and observing whether the value displayed by the corresponding voltmeter or ammeter changes correspondingly.
Further, in one embodiment, the analog voltage circuit 272 includes a first potentiometer and an adjustment knob; the analog current circuit 274 includes a second potentiometer, a transformer and an adjustment knob. The user can adjust the resistance values of the first potentiometer of the analog voltage circuit 272 and the second potentiometer of the analog current circuit 274 by adjusting the adjusting knob, so as to adjust the magnitude of the test voltage signal output by the analog voltage signal circuit 272 or the test current signal output by the analog current signal circuit 274. In a preferred embodiment, the first potentiometer and the second potentiometer can be WTH (118)2M2-2W potentiometers, the test voltage of the analog voltage circuit 272 is adjusted within a range of 101-230V of 50Hz sine wave voltage, and the transformer of the analog current circuit 274 can be a power frequency transformer with a transformation ratio of 100: 1.
In one embodiment, the circuit detection apparatus 200 further includes a main switch 220 and an indicator lamp 212, wherein the main switch 220 is connected in series with a path of the first switch 222 electrically connected to the power interface 210; the indicator lamp 212 is connected to a path where the main switch 220 is electrically connected to the first switch 222. The main switch 220 is disposed before the first switch 222, the second switch 224 and the third switch 226, and is used to control the operation state of the entire circuit testing device 200. The indicator lamp 212 is connected between the main switch 220 and other switches, and the indicator lamp 212 is electrically connected with the external power supply through the main switch 220 for indicating the power supply state of the external power supply. When the external power source is connected and the main switch 220 is closed, the indicator lamp 212 emits light to indicate that the external power source is normally powered, and other switches can be continuously closed to perform corresponding detection.
Further, in a preferred embodiment, the main switch 220 is an air switch and the first switch 222 is a boat-type switch. The main switch 220 is an air switch to protect the circuit detecting device 200, and when an overload condition occurs, the air switch can be automatically turned off to prevent the circuit detecting device 200 from being damaged. And the first switch 222, the second switch 224 and the third switch 226 may be ship-type switches for easy use in operation.
In one embodiment, the circuit detection apparatus 200 further comprises: the first fuse F1 is connected in series with a path through which the live wire L of the external power interface is electrically connected with the first switch; the second fuse F2 is connected in series on a path where the positive voltage output end of the first voltage conversion circuit is electrically connected with the measurement interface; and the third fuse is connected in series with a passage electrically connected with the negative voltage output end of the first voltage conversion circuit and the external measurement interface.
Specifically, the first fuse F1, the second fuse F2, and the third fuse F3 have an overcurrent protection function, and can be opened when an overcurrent occurs in a connected circuit, so that the circuit is prevented from being damaged. The first fuse F1, the second fuse F2, and the third fuse F3 may be disposed on a surface of the circuit testing device 200 to facilitate replacement of fuses that are burned by overcurrent. The first fuse F1, the second fuse F2 and the third fuse F3 may also be self-restoring fuses which can be automatically restored after the protection circuit is opened, so as to avoid the operation of replacing the fuses by a user.
In one implementation, the display meter circuitry 250 includes: a voltmeter connected in parallel to two ends of the output interface of the first voltage conversion circuit 230; the ammeter is connected in series to a path where the positive voltage output terminal of the output interface of the first voltage conversion circuit 230 is electrically connected to the measurement interface 280. The voltmeter and the ammeter can respectively detect the data of the voltage and the current of the voltage and current measuring circuit board, and the number of the voltmeter and the ammeter can be multiple, so as to respectively display the multi-channel measuring results of the voltage and current measuring circuit board.
In one embodiment, the trigger circuit 260 includes a PWM wave signal generator 262, a first resistor R1, and a two-stage switch; the input ends of the PWM wave signal generator 262 and the first resistor R1 are electrically connected to the output end of the second voltage converting circuit 240, the output ends of the PWM wave signal generator 262 and the first resistor R1 are electrically connected to the two input ends of the two-stage switch, respectively, and the output end of the two-stage switch is electrically connected to the detection interface. The two-gear switch comprises two gears, when the two-gear switch is switched to a first resistor R1 gear for triggering, the two-gear switch is triggered at a high level, and the output value of the measuring circuit is a voltage value during switching; when the two-gear switch is switched to the PWM wave signal generator 262 for triggering, the voltage is sampled by simulating the actual sampling frequency, and at the moment, the sampled waveform on the corresponding test point can be observed through the oscilloscope. The two-gear switch can be a button switch, so that the user can operate and use the two-gear switch conveniently.
It can be understood that the embodiment of the present invention provides a circuit detection device, which has a functional module and a beneficial effect for executing corresponding functions. Each unit and module included in the circuit detection apparatus in the above embodiment are only divided according to functional logic, but are not limited to the above division as long as the corresponding functions can be realized; in addition, the specific names of the functional modules are only for the convenience of distinguishing from each other, and are not used to limit the protection scope of the present invention.
Further, fig. 3 is a schematic diagram of a circuit connection of the voltage and current measuring circuit board for detecting by the circuit detecting device in an embodiment, as shown in fig. 3, the external power source 400 may be a commercial power or a power supply battery, etc., the external power source 400 is electrically connected to a terminal of the power interface 210 of the circuit detecting device 200, the voltage and current measuring circuit board 500 to be tested is connected to a corresponding detecting terminal of the detecting interface 280 of the circuit detecting device, and the detecting interface 280 is further provided with a terminal for connecting the oscilloscope 600 to display a detected sampling waveform.
Fig. 4 is a schematic diagram illustrating a top view of a circuit testing apparatus according to an embodiment, as shown in fig. 4, in an embodiment, the top surface of the circuit detection device 200 is provided with a power interface 210, a main switch 220, a first switch 222, a second switch 224, a third switch 226, a detection interface 280, a connection interface of the oscilloscope 600, and the like, the structures of the first voltmeter 252, the second voltmeter 254, the third voltmeter 256, and the fourth voltmeter 258 are respectively the same as the corresponding structures in the foregoing embodiments, the first voltmeter 252, the second voltmeter 254, the third voltmeter 256, and the fourth voltmeter 258 are further disposed on the top view surface of the circuit detecting device 200 in this embodiment, the first voltmeter 252, the second voltmeter 254, the third voltmeter 256, and the fourth voltmeter 258 are respectively electrically connected to the output end of the second voltage converting circuit, and the first voltmeter 252, the second voltmeter 254, the third voltmeter 256, and the fourth voltmeter 258 are respectively used for displaying the output voltage values of the four measuring circuits of the voltage-current measuring circuit board 500.
The circuit detection device 200 is further provided with a two-position button switch 264 on the top surface, and the two-position button switch 264 is used for switching a first resistance position or a PWM signal generator position in the trigger circuit to trigger. The overlooking surface of the circuit detection device 200 is also provided with a voltage adjusting knob 273, a current adjusting knob 275, an analog voltmeter 277 and an analog ammeter 278, wherein the voltage adjusting knob 273 is used for adjusting the resistance value of the first potentiometer, so that the output test voltage of the analog voltage signal circuit is changed, and the specific value of the test voltage can be detected and displayed by the analog voltmeter 277; the current adjustment knob 275 is used to adjust the resistance of the second potentiometer, thereby changing the magnitude of the test current output by the analog current signal circuit, which can be detected and displayed by the analog current meter 278.
Further, when the voltage and current measuring circuit board 500 is detected, all switches are turned to the off position, the external power supply 400 is connected to the power supply interface 210 through a conducting wire, the circuit current detecting board 500 is set to be in a voltage measuring state, the input end of the voltage and current measuring circuit board 500 is connected to the detecting interface 280 through a conducting wire, and the test voltage signal is connected to the first path of voltage and current measuring circuit of the voltage and current measuring circuit board 500 through the detecting interface 280. Then, the main switch 220 is closed, the first switch 222, the second switch 224 and the third switch 226 are closed after the indicator lamp is confirmed to be turned on, the button two-gear switch 264 of the trigger circuit is controlled, the outgoing circuit is connected to a gear of the PWM wave signal generator and a gear of the first resistor respectively to be triggered, and the value displayed by the first voltmeter 252 corresponding to the first voltage detection circuit is checked; the magnitude of the test voltage signal is adjusted through the voltage adjusting knob 273, whether the value displayed by the first voltmeter 252 changes correspondingly or not is checked, and whether the change condition of the corresponding waveform meets the requirement or not is checked through the oscilloscope 600; and after the first voltage measuring circuit is normal, respectively testing other three paths of voltage measuring circuits according to the detection steps of the first voltage measuring circuit.
After the four voltage measuring circuits of the circuit current detecting board 500 are detected, the voltage current detecting board 500 is set to be in a current measuring state, and the test current signal is accessed to the first current measuring circuit of the voltage current measuring circuit board 500 through the detection interface 280. Then, the main switch 220 is closed, after the indicator light is confirmed to be lit, the first switch 222, the second switch 224 and the third switch 226 are closed, the button two-gear switch 264 of the trigger circuit is controlled, the outgoing circuit is connected to the gear of the PWM wave signal generator and the gear of the first resistor to be triggered, and the value of the first voltmeter 252 corresponding to the first current detection circuit is checked. The magnitude of the test current signal is adjusted through the current adjusting knob 275, whether the value displayed by the first voltmeter 252 changes correspondingly or not is checked, and whether the change condition of the corresponding waveform meets the requirement or not is checked by using the oscilloscope 600; and after the first current measuring circuit is normal, respectively testing the other three current measuring circuits according to the detection steps of the first current measuring circuit. After the voltage and current measuring circuits are normal, the main switch 220 can be turned to the off position, and the voltage and current measuring circuit board 500 can be detached from the circuit detecting device 200 to complete the test.
Fig. 5 is a schematic diagram illustrating an external structure of the circuit detecting apparatus in an embodiment, as shown in fig. 5, in an embodiment, the circuit detecting apparatus 200 further includes a case 192 and a case cover 194, the first circuit component is disposed on a surface of the case 192, and the second circuit component is disposed inside the case 192; the cover 194 is rotatably connected to the case 192, the first circuit component is disposed on the same surface of the case 192, and the cover 194 covers a surface of the case 192 on which the first circuit component is disposed.
Specifically, in the circuit detection device 200, a first circuit component such as an interface for connecting an external device and a component required for user operation is disposed on the surface of the box 192, and an internal circuit for detection is disposed inside the box 192, when detection is performed, the box cover 194 is opened from the surface on which the first circuit component is disposed, and when detection is not performed, the box cover 194 can cover the surface on which the first circuit component is disposed, so that the first component and the second component of the circuit detection device 200 are protected as much as possible without affecting detection operation, so that the circuit detection device 200 can adapt to a severe use environment, and meanwhile, a handle or a roller and the like can be disposed on the box 192, so that a user can move or carry the circuit detection device.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above embodiments only represent the preferred embodiments of the present invention and the technical principles applied, and the description thereof is specific and detailed, but not construed as limiting the scope of the invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A circuit detection device is applied to detecting a voltage and current measurement circuit board and is characterized by comprising a first circuit component and a second circuit component, wherein the first circuit component comprises a power interface, a first switch, a second switch and a detection interface, and the second circuit component comprises a first voltage conversion circuit, a second voltage conversion circuit, a display meter circuit and a trigger signal generation circuit;
the power supply interface is used for being connected with an external power supply, and the detection interface is used for being connected with the voltage and current measurement circuit board; the input end of the first voltage conversion circuit is electrically connected with the power interface through the first switch, the output end of the first voltage conversion circuit is electrically connected with the detection interface, and the display meter circuit is connected to a path through which the output end of the first voltage conversion circuit is electrically connected with the detection interface; the input end of the second voltage conversion circuit is electrically connected with the power interface through the second switch, and the output end of the second voltage conversion circuit is electrically connected with the detection interface through the trigger signal generation circuit.
2. The circuit detection device of claim 1, wherein the display meter circuit comprises:
the voltmeter is connected in parallel at two ends of the output interface of the first voltage conversion circuit;
and the ammeter is connected in series on a passage electrically connected with the detection interface and the positive voltage output end of the output interface of the first voltage conversion circuit.
3. The circuit detection device according to claim 2, wherein the trigger signal generation circuit comprises a PWM wave signal generator, a first resistor, and a two-stage switch; the input ends of the PWM wave signal generator and the first resistor are electrically connected with the output end of the second voltage conversion circuit, the output ends of the PWM wave signal generator and the first resistor are respectively electrically connected with two input ends of the two-gear switch, and the output ends of the two-gear switch are electrically connected with the detection interface.
4. The circuit detection device of claim 1, further comprising:
the analog voltage circuit and the analog current circuit are electrically connected with the power interface through a third switch, and output interfaces of the analog voltage circuit and the analog current circuit are electrically connected with the detection interface.
5. The circuit detection device of claim 4, wherein the analog voltage circuit comprises a first potentiometer and an adjustment knob; the analog current circuit comprises a second potentiometer, a transformer and an adjusting knob.
6. The circuit testing device of claim 5, wherein said first potentiometer and said second potentiometer are each a WTH (118)2M2-2W potentiometer; the transformer is a power frequency transformer with the transformation ratio of 100: 1.
7. The circuit detection device of claim 1, further comprising:
the main switch is connected in series on a path electrically connected with the first switch and the power interface;
and the indicating lamp is connected to a path electrically connected with the main switch and the first switch.
8. The circuit testing device of claim 7, wherein said master switch is an air switch and said first switch is a boat switch.
9. The circuit detection device of claim 1, further comprising:
the first fuse is connected in series with a path of the live wire of the power interface and the first switch in electric connection;
the second fuse is connected in series with a path electrically connected with the positive voltage output end of the first voltage conversion circuit and the detection interface;
and the third fuse is connected in series with a passage electrically connected with the detection interface and the negative voltage output end of the first voltage conversion circuit.
10. The circuit detection device according to any one of claims 1 to 9, further comprising a case and a cover, wherein the first circuit component is disposed on a surface of the case, and the second circuit component is disposed inside the case; the case lid with the box rotates to be connected, first circuit assembly set up in on the same face of box, the case lid is used for covering the box is provided with first circuit assembly's surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921901254.5U CN212060482U (en) | 2019-11-06 | 2019-11-06 | Circuit detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921901254.5U CN212060482U (en) | 2019-11-06 | 2019-11-06 | Circuit detection device |
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| Publication Number | Publication Date |
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| CN212060482U true CN212060482U (en) | 2020-12-01 |
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| CN201921901254.5U Active CN212060482U (en) | 2019-11-06 | 2019-11-06 | Circuit detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113671294A (en) * | 2021-08-27 | 2021-11-19 | 中航华东光电有限公司 | Testing device for adjusting residual image of liquid crystal module |
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2019
- 2019-11-06 CN CN201921901254.5U patent/CN212060482U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113671294A (en) * | 2021-08-27 | 2021-11-19 | 中航华东光电有限公司 | Testing device for adjusting residual image of liquid crystal module |
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