CN215678544U - Test equipment - Google Patents
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- CN215678544U CN215678544U CN202121447219.8U CN202121447219U CN215678544U CN 215678544 U CN215678544 U CN 215678544U CN 202121447219 U CN202121447219 U CN 202121447219U CN 215678544 U CN215678544 U CN 215678544U
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Abstract
The application discloses test equipment, this test equipment includes power access circuit, equipment access circuit, voltage comparison circuit and threshold value setting circuit, wherein, equipment access circuit includes a plurality of work branches, each the equipment that awaits measuring can all be inserted to the work branch road to obtain the standby current of the equipment that awaits measuring of inserting, can realize simultaneously the acquisition to the standby current of a plurality of equipment that awaits measuring, equipment access circuit cooperation voltage comparison circuit and threshold value setting circuit then can realize simultaneously the standby current test to single or a plurality of equipment that awaits measuring, in order to improve the efficiency of the test to the standby current of the equipment that awaits measuring. In addition, the threshold setting circuit comprises an adjustable resistor, and the threshold current determined by the threshold setting circuit can be adjusted by adjusting the adjustable resistor, so that the standby current test requirements of different types of equipment to be tested can be met, and the adaptability of the test equipment is improved.
Description
Technical Field
The application relates to the technical field of testing, in particular to a testing device.
Background
Low power consumption is an important requirement for self-powered devices for special application areas, such as aerospace applications. Based on the low power consumption requirement, according to the test requirement of a matched product, in order to prolong the service life of the product and reduce the use power consumption of the product, the self-powered product needs to be subjected to a standby current test.
At present, equipment for testing standby current can only test single-type test equipment, so that the adaptability is poor and the test efficiency is low.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the application provides a test device to achieve the purpose of improving the adaptability and the test efficiency of the test device.
In order to achieve the above purpose, the present application provides the following technical solutions:
a test apparatus for testing standby current of a device under test, the test apparatus comprising: the device comprises a power access circuit, a device access circuit, a voltage comparison circuit and a threshold setting circuit; wherein the content of the first and second substances,
the output end of the power supply access circuit is electrically connected with the input ends of the equipment access circuit and the threshold setting circuit, and the power supply access circuit is configured to be accessed into a test power supply and provide working power supply for the equipment access circuit and the threshold setting circuit.
The equipment access circuit comprises a plurality of working branches, the working branches are in one-to-one correspondence with a plurality of first sampling input ends of the voltage comparison circuit, one end of each working branch is electrically connected with the output end of the power access circuit, the other end of each working branch is electrically connected with the corresponding first sampling input end of the working branch, and the working branches are configured to be accessed into equipment to be tested and obtain standby current of the accessed equipment to be tested.
The threshold setting circuit comprises an adjustable resistor, and the threshold setting circuit is configured to determine a threshold current based on the working power supply and the resistance value of the adjustable resistor and provide the threshold current to the voltage comparison circuit;
the voltage comparison circuit comprises a second sampling input end and a plurality of first sampling input ends, the second sampling input end is electrically connected with the output end of the threshold setting circuit, each first sampling input end is electrically connected with each working branch in a one-to-one correspondence mode, and the voltage comparison circuit is configured to determine whether each connected device to be tested is normal or not based on the threshold current and each standby current.
For example, the voltage comparison circuit further includes a plurality of result output ends, and the voltage comparison circuit is further configured to output, through each of the result output ends, an indication voltage representing whether the device under test is normal.
For example, the test apparatus further includes: a result indication circuit;
the result indicating circuit comprises a plurality of indicating lamps, the positive pole of each indicating lamp is connected with each result output end, the negative pole of each indicating lamp is electrically connected with the power supply access circuit, and the indicating lamps are lightened when the received indicating voltage is in a first state.
For example, the device access circuit is further configured to display a standby current of the accessed device to be tested;
the working branch comprises: a first switch, a first ammeter and two access ports connected in series;
the two access ports are respectively used for accessing the anode and the cathode of the equipment to be tested, the first switch is used for determining the working state of the working branch, and the first ammeter is used for displaying the accessed standby current of the equipment to be tested.
For example, the threshold setting circuit is also used to display the threshold current;
the threshold setting circuit includes: a second ammeter and an adjustable resistance element connected in series;
the second ammeter is used for displaying the threshold current;
the adjustable resistance element is used for adjusting the threshold current.
For example, the voltage comparison circuit includes: the circuit comprises a threshold current sampling branch circuit, a plurality of voltage comparators and a plurality of standby current sampling branch circuits;
the input end of the threshold current sampling branch circuit is electrically connected with the output end of the threshold setting circuit, and the output end of the threshold current sampling branch circuit is electrically connected with the first input ends of the plurality of voltage comparators;
the input end of each standby current sampling branch circuit is electrically connected with the output end of the equipment access circuit, and the output end of each standby current sampling branch circuit is respectively and correspondingly electrically connected with the second input end of each voltage comparator.
For example, the threshold current sampling branch includes: and the input end of the first voltage amplifier is used as the second sampling input end and is electrically connected with the output end of the threshold setting circuit, and the first voltage amplifier is used for converting the threshold current into the threshold voltage and amplifying the threshold voltage and then outputting the threshold voltage.
For example, the standby current sampling branch includes: a first resistor and a differential pressure amplifier; wherein the content of the first and second substances,
one end of the first resistor is the first sampling input end, and the other end of the first resistor is grounded;
a first input end and a second input end of the differential pressure amplifier are respectively and electrically connected with two ends of the first resistor, and an output end of the differential pressure amplifier is electrically connected with a second input end of the voltage comparator;
the differential pressure amplifier is used for collecting the voltage at two ends of the first resistor as a standby voltage representing the standby current, amplifying the standby voltage and transmitting the amplified standby voltage to the second input end of the voltage comparator, so that the voltage comparator judges whether the equipment to be tested is normal according to the standby voltage and the threshold voltage and outputs the indication voltage according to the judgment result.
For example, the threshold current sampling branch, the plurality of voltage comparators and the plurality of standby current sampling branches are all disposed on the circuit board.
For example, it also includes: the upper cover and the box body form a sealed cavity, and the circuit board is located in the sealed cavity.
According to the technical scheme, the test equipment comprises a power access circuit, an equipment access circuit, a voltage comparison circuit and a threshold setting circuit, wherein the equipment access circuit comprises a plurality of working branches, each working branch can be accessed to equipment to be tested, standby current of the accessed equipment to be tested is obtained, the standby current of the equipment to be tested can be obtained simultaneously, the voltage comparison circuit can determine whether the accessed equipment to be tested is normal or not based on the threshold current and each standby current determined by the threshold setting circuit, the standby current test of single or multiple equipment to be tested is realized simultaneously, and the test efficiency of the standby current of the equipment to be tested is improved.
In addition, the threshold setting circuit comprises an adjustable resistor, and the threshold current determined by the threshold setting circuit can be adjusted by adjusting the adjustable resistor, so that the standby current test requirements of different types of equipment to be tested can be met, and the adaptability of the test equipment is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a standby current testing apparatus;
FIG. 2 is a schematic structural diagram of a test apparatus according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a wire clamp according to an embodiment of the present application;
FIG. 4 is a schematic structural diagram of a testing apparatus according to another embodiment of the present application;
FIG. 5 is a schematic diagram of a test apparatus according to another embodiment of the present application;
fig. 6 is a schematic structural diagram of a voltage comparison circuit according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of an upper cover and a box body according to an embodiment of the present application.
Detailed Description
Referring to fig. 1, fig. 1 shows a schematic diagram of a standby current testing apparatus, which includes a regulated power supply and a digital dc ammeter, the regulated power supply (for outputting dc power supply) during testing, the digital direct current ammeter (the display screen of the digital direct current ammeter can display the number of the current to be seen, and a tester can read the number in a manual monitoring mode) and a device to be tested (the device to be tested is a self-powered device) are connected in series, a connecting wire harness is tied up by using a tying method, a stabilized voltage power supply outputs direct current through a power supply output interface to supply power to the device to be tested and the digital direct current ammeter, the positive pole of the power supply interface of the device to be tested is electrically connected with the negative pole of the power supply output interface, the positive pole of the power supply output interface is electrically connected with the positive pole of the digital direct current ammeter, and the negative pole of the digital direct current ammeter is electrically connected with the negative pole of the power supply interface.
During testing, the standby current readings of the digital direct current ammeter are manually monitored to obtain the test result.
In the test equipment, a test interface is single, batch tests cannot be realized, the pre-charging time is long, manual waiting and interpretation are needed, and the threshold setting cannot be judged for different self-powered low-power-consumption equipment.
In order to solve the problem, an embodiment of the present application provides a test device, where the test device includes a power access circuit, a device access circuit, a voltage comparison circuit, and a threshold setting circuit, where the device access circuit includes a plurality of working branches, each working branch can access a device to be tested and obtain a standby current of the accessed device to be tested, that is, the standby current of a plurality of devices to be tested can be simultaneously obtained, and the voltage comparison circuit can determine whether each accessed device to be tested is normal or not based on the threshold current and each standby current determined by the threshold setting circuit, so as to achieve a standby current test of a single device or a plurality of devices to be tested simultaneously, and improve the test efficiency of the standby current of the devices to be tested.
In addition, the threshold setting circuit comprises an adjustable resistor, and the threshold current determined by the threshold setting circuit can be adjusted by adjusting the adjustable resistor, so that the standby current test requirements of different types of equipment to be tested can be met, and the adaptability of the test equipment is improved.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
An embodiment of the present application provides a test device, configured to test a standby current of a device under test, as shown in fig. 2, the test device includes: power access circuit 10, device access circuit 20, voltage comparison circuit 30, and threshold setting circuit 40.
The output end of the power access circuit 10 is electrically connected with the input ends of the device access circuit 20 and the threshold setting circuit 40, and the power access circuit 10 is configured to access a test power supply and provide an operating power supply for the device access circuit 20 and the threshold setting circuit 40.
The device access circuit 20 includes a plurality of working branches. One end of each working branch is electrically connected with the output end of the power access circuit 10, and the other end is electrically connected with the first sampling input end of the voltage comparison circuit 30. The working branch circuit is configured to be connected with a device to be tested and obtain the standby current of the connected device to be tested.
The threshold setting circuit 40 includes an adjustable resistor, and the threshold setting circuit 40 is configured to determine a threshold current based on the operating power supply and the resistance value of the adjustable resistor and provide the threshold current to the voltage comparison circuit 30.
The voltage comparison circuit 30 includes a second sampling input terminal and a plurality of first sampling input terminals, the second sampling input terminal is electrically connected to the output terminal of the threshold setting circuit 40, each first sampling input terminal is electrically connected to each working branch in a one-to-one correspondence, and the voltage comparison circuit 30 is configured to determine whether each connected device under test is normal based on the threshold current and each standby current.
For example, referring to fig. 5 in combination, the power access circuit 10 may further include a power switch with lamp K2 in addition to the power interface 11 for accessing the external test power, the power switch with lamp K2 controls the operating state of the power access circuit 10 or the whole test equipment, and the power switch with lamp K2 may also indicate whether the switch itself is in the on state or the off state through the state of the lamp.
The port of each working branch which is connected to the equipment to be tested can be an access port Y1 provided by equipment such as a wire clamp, referring to FIG. 3, FIG. 3 shows a schematic diagram of the wire clamp with the model of WP10-11, the wire clamp with the model can provide 10 access ports Y1, every two access ports Y1 can be connected to one working branch, two access ports Y1 in one working branch can be respectively connected with the anode and the cathode of the equipment to be tested, the access of the equipment to be tested is realized, and thus the wire clamp with the model of WP10-11 can meet the access requirements of 5 working branches. In one wire clamp, two access ports which are adjacent in the longitudinal direction or the transverse direction can be connected into one working branch, or two access ports Y1 which are not adjacent can be connected into one working branch, and the application does not limit the invention.
The threshold current determined by the threshold setting circuit 40 is generally equal to the ratio of the operating supply voltage to the resistance of the adjustable resistor, which may be implemented as a sliding varistor or a resistor box, for example.
The voltage comparison circuit 30 generally needs to convert the threshold current and the standby current into the threshold voltage and the standby voltage respectively after collecting the threshold current and the standby current, and after comparing the threshold voltage with the standby voltage, determines whether each connected device to be tested is normal, and in general, when the threshold voltage is greater than the standby voltage, determines that the device to be tested corresponding to the standby voltage is normal, and when the threshold voltage is less than the standby voltage, determines that the device to be tested corresponding to the standby voltage is abnormal.
For example, in one embodiment of the present application, the voltage comparison circuit 30 includes a plurality of result output terminals, and the voltage comparison circuit 30 is further configured to output an indication voltage representing whether the device under test is normal through each result output terminal.
In this embodiment, the indication voltage output by the voltage comparison circuit 30 may include two states to respectively represent a normal state and an abnormal state of the device under test, for example, the indication voltage may include two states, i.e., a high level and a low level, and when the indication voltage is the high level, the indication voltage represents that the device under test is normal, and when the indication voltage is the low level, the indication voltage represents that the device under test is abnormal.
The state of the indicating voltage can be obtained by devices such as a voltmeter and an indicating lamp LD. For example, when the indication voltage is at a high level, the indication lamp LD may be turned on by the high level indication voltage to indicate that the device under test is normal. When the indicating voltage is at a low level, the indicating lamp LD cannot be turned on by the indicating voltage at the low level, and the abnormality of the equipment to be tested is represented.
For example, in one embodiment of the present application, as shown in fig. 4, the test apparatus further includes: the result indicates the circuit 50.
The result indicating circuit 50 includes a plurality of indicator lamps LD, the positive pole of each indicator lamp LD is connected to each result output terminal, the negative pole of each indicator lamp LD is electrically connected to the power supply connection circuit 10, and the indicator lamps LD are turned on when the received indicating voltage is in the first state.
In this embodiment, the indication voltage state is displayed by the result indication circuit 50, and the negative electrode of the indicator light LD is electrically connected to the negative electrode of the test power supply connected to the power supply connection circuit 10 to form a loop. When the indication voltage is in the first state (for example, high level), it indicates that the acquired standby current is smaller than the threshold current, and at this time, the indicator lamp LD is turned on to indicate that the device under test corresponding to the indicator lamp LD is normal, and correspondingly, when the indication voltage is in the second state (for example, low level), it indicates that the acquired standby current is greater than the threshold current, and the indicator lamp LD is turned off to indicate that the device under test corresponding to the indicator lamp LD is abnormal.
For example, in another embodiment of the present application, the device accessing circuit 20 is further configured to display the standby current of the accessed device under test, so as to more intuitively display the standby current value of each device under test, and more comprehensively connect the standby state of each device under test.
Referring to fig. 5, the working branch includes: a first switch K1, a first ammeter a1 and two access ports Y1 connected in series.
The two access ports Y1 are respectively used for accessing the anode and the cathode of the equipment to be tested, the first switch K1 is used for determining the working state of the working branch, and the first ammeter A1 is used for displaying the standby current of the accessed equipment to be tested.
As before, the access port Y1 for each working leg can be provided by a wire clamp, two wire clamps of type WP10-11 are shown in fig. 5, which can meet the access device requirements for 10 working legs.
For example, in other embodiments of the present application, the access port Y1 may be provided by other types of wire clamps or other types of components, and the number of working branches is not limited to 10, and may be 5, 15, 20, etc., which is not limited in this application.
The first switch K1 is used to control the on/off state of the whole working branch, and when a certain working branch needs to work, the first switch K1 in the branch is turned on.
For the threshold setting circuit 40, for example, in one embodiment of the present application, the threshold setting circuit 40 is also used to display the threshold current;
still referring to fig. 5, the threshold setting circuit 40 includes: a second ammeter a2 and an adjustable resistance element RT connected in series;
a second ammeter a2 for displaying a threshold current;
and an adjustable resistance element RT used for adjusting the threshold current.
In this embodiment, the threshold setting circuit 40 further displays the threshold current, so that the tester can more clearly know the magnitude of the threshold current, and the combination of the second ammeter a2 and the adjustable resistive element RT can conveniently adjust the magnitude of the threshold current by adjusting the magnitude of the resistance.
As for the voltage comparison circuit 30, referring to fig. 6, the voltage comparison circuit 30 includes: a threshold current sampling branch 31, a plurality of voltage comparators 33, and a plurality of standby current sampling branches 32;
the input end of the threshold current sampling branch 31 is electrically connected with the output end of the threshold setting circuit 40, and the output end of the threshold current sampling branch 31 is electrically connected with the first input ends of the plurality of voltage comparators 33;
the input end of each standby current sampling branch 32 is electrically connected to the output end of the device access circuit 20, and the output ends of the standby current sampling branches 32 are electrically connected to the second input ends of the voltage comparators 33 in a one-to-one correspondence.
Among them, for example, the threshold current sampling branch 31 includes: and an input terminal of the first voltage amplifier 311 is electrically connected to the output terminal of the threshold setting circuit 40 as a second sampling input terminal, and the first voltage amplifier 311 is configured to convert the threshold current into a threshold voltage, amplify the threshold voltage, and output the amplified threshold voltage.
The standby current sampling branch 32 includes: a first resistor R1 and a differential pressure amplifier 321; wherein the content of the first and second substances,
one end of the first resistor R1 is a first sampling input end, and the other end of the first resistor R1 is grounded;
a first input end and a second input end of the differential pressure amplifier 321 are electrically connected with two ends of the first resistor R1 respectively, and an output end of the differential pressure amplifier 321 is electrically connected with a second input end of the voltage comparator 33;
the differential pressure amplifier 321 is configured to collect voltage at two ends of the first resistor R1 as standby voltage representing standby current, amplify the standby voltage, and transmit the amplified standby voltage to the second input end of the voltage comparator 33, so that the voltage comparator 33 determines whether the device under test is normal according to the standby voltage and the threshold voltage, and outputs an indication voltage according to a determination result.
In fig. 5, ten differential pressure amplifiers 321, ten voltage comparators 33, and ten first resistors R1 are taken as an example for explanation, and the voltage comparison circuit 30 shown in fig. 5 can simultaneously perform the standby current test on ten devices under test, for example, in other embodiments of the present application, when the number of devices under test that simultaneously need to be tested changes, the number of differential pressure amplifiers 321, voltage comparators 33, and first resistors R1 in the voltage comparison circuit 30 may change accordingly, which is not limited in the present application.
For example, referring to fig. 7, a threshold current sampling branch 31, a plurality of voltage comparators 33, and a plurality of standby current sampling branches 32 are provided on the circuit 60.
The threshold current sampling branch 31, the voltage comparator 33 and the standby current sampling branch 32 are arranged on the circuit board 60, so that the number of connecting wire harnesses among devices is reduced, and the arrangement regularity of the voltage comparison circuit 30 is improved.
For example, still referring to fig. 7, the test apparatus further includes: the upper cover 70 and the box body 80 form a sealed cavity, and the circuit board 60 is packaged in the sealed cavity.
The circuit board is disposed at the bottom of the box 80, and the circuit board 60 is fixed by a plurality of screw holes disposed in the box 80 and studs 92 and screws 91 penetrating the screw holes.
To sum up, this application embodiment provides a test equipment, and this test equipment includes power access circuit, equipment access circuit, voltage comparison circuit and threshold value setting circuit, and wherein, equipment access circuit includes a plurality of work branches, each the equipment that awaits measuring can all be inserted to work branch to obtain the standby current of the equipment that awaits measuring of access, can realize simultaneously the acquisition to the standby current of a plurality of equipment that awaits measuring, voltage comparison circuit then can be based on threshold current and each that threshold value setting circuit confirms whether each equipment that awaits measuring of access is normal, realizes the standby current test to single or a plurality of equipment that awaits measuring simultaneously, with the test efficiency who improves the standby current to the equipment that awaits measuring.
In addition, the threshold setting circuit comprises an adjustable resistor, and the threshold current determined by the threshold setting circuit can be adjusted by adjusting the adjustable resistor, so that the standby current test requirements of different types of equipment to be tested can be met, and the adaptability of the test equipment is improved.
Features described in the embodiments in the present specification may be replaced with or combined with each other, each embodiment is described with a focus on differences from other embodiments, and the same and similar portions among the embodiments may be referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A test apparatus for testing a standby current of a device under test, the test apparatus comprising: the device comprises a power access circuit, a device access circuit, a voltage comparison circuit and a threshold setting circuit; wherein the content of the first and second substances,
the output end of the power supply access circuit is electrically connected with the input ends of the equipment access circuit and the threshold setting circuit, and the power supply access circuit is configured to be accessed with a test power supply and provide working power supply for the equipment access circuit and the threshold setting circuit;
the equipment access circuit comprises a plurality of working branches, the working branches correspond to a plurality of first sampling input ends of the voltage comparison circuit one by one, one end of each working branch is electrically connected with the output end of the power access circuit, the other end of each working branch is electrically connected with the first sampling input end corresponding to the working branch, and the working branches are configured to be accessed into equipment to be tested and obtain standby current of the accessed equipment to be tested;
the threshold setting circuit comprises an adjustable resistor, and the threshold setting circuit is configured to determine a threshold current based on the working power supply and the resistance value of the adjustable resistor and provide the threshold current to the voltage comparison circuit;
the voltage comparison circuit comprises a second sampling input end and a plurality of first sampling input ends, and the second sampling input end is electrically connected with the output end of the threshold setting circuit.
2. The test equipment of claim 1, wherein the voltage comparison circuit further comprises a plurality of result outputs, and wherein the voltage comparison circuit is further configured to output an indication voltage indicative of whether the device under test is normal via each of the result outputs.
3. The test apparatus of claim 2, further comprising: a result indication circuit;
the result indicating circuit comprises a plurality of indicating lamps, the positive pole of each indicating lamp is connected with each result output end, the negative pole of each indicating lamp is electrically connected with the power supply access circuit, and the indicating lamps are lightened when the received indicating voltage is in a first state.
4. The test equipment of claim 1, wherein the equipment access circuit is further configured to display a standby current of the accessed equipment under test;
the working branch comprises: a first switch, a first ammeter and two access ports connected in series;
the two access ports are respectively used for accessing the anode and the cathode of the equipment to be tested, the first switch is used for determining the working state of the working branch, and the first ammeter is used for displaying the accessed standby current of the equipment to be tested.
5. The test apparatus of claim 1, wherein the threshold setting circuit is further configured to display the threshold current;
the threshold setting circuit includes: a second ammeter and an adjustable resistance element connected in series;
the second ammeter is used for displaying the threshold current;
the adjustable resistance element is used for adjusting the threshold current.
6. The test apparatus of claim 2, wherein the voltage comparison circuit further comprises: the circuit comprises a threshold current sampling branch circuit, a plurality of voltage comparators and a plurality of standby current sampling branch circuits;
the input end of the threshold current sampling branch circuit is electrically connected with the output end of the threshold setting circuit, and the output end of the threshold current sampling branch circuit is electrically connected with the first input ends of the plurality of voltage comparators;
the input end of each standby current sampling branch circuit is electrically connected with the output end of the equipment access circuit, and the output end of each standby current sampling branch circuit is respectively and correspondingly electrically connected with the second input end of each voltage comparator.
7. The test apparatus of claim 6, wherein the threshold current sampling branch comprises: and the input end of the first voltage amplifier is used as the second sampling input end and is electrically connected with the output end of the threshold setting circuit, and the first voltage amplifier is used for converting the threshold current into the threshold voltage and amplifying the threshold voltage and then outputting the threshold voltage.
8. The test apparatus of claim 7, wherein the standby current sampling branch comprises: a first resistor and a differential pressure amplifier; wherein the content of the first and second substances,
one end of the first resistor is the first sampling input end, and the other end of the first resistor is grounded;
a first input end and a second input end of the differential pressure amplifier are respectively and electrically connected with two ends of the first resistor, and an output end of the differential pressure amplifier is electrically connected with a second input end of the voltage comparator;
the differential pressure amplifier is used for collecting the voltage at two ends of the first resistor as a standby voltage representing the standby current, amplifying the standby voltage and transmitting the amplified standby voltage to the second input end of the voltage comparator, so that the voltage comparator judges whether the equipment to be tested is normal according to the standby voltage and the threshold voltage and outputs the indication voltage according to the judgment result.
9. The test equipment of claim 6, wherein the threshold current sampling branch, the plurality of voltage comparators, and the plurality of standby current sampling branches are disposed on a circuit board.
10. The test apparatus of claim 9, further comprising: the upper cover and the box body form a sealed cavity, and the circuit board is located in the sealed cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121447219.8U CN215678544U (en) | 2021-06-28 | 2021-06-28 | Test equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121447219.8U CN215678544U (en) | 2021-06-28 | 2021-06-28 | Test equipment |
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| CN215678544U true CN215678544U (en) | 2022-01-28 |
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