Test circuit and test equipment capable of automatically switching resistance and voltage tests

Abstract

The utility model provides a test circuit and test equipment capable of automatically switching resistance and voltage tests, and relates to the technical field of electrical tests, the test circuit comprises a precision resistor, a single-pole single-throw switch, a single-pole multi-throw switch and a control chip, according to the test circuit, a power-on indication end of a to-be-tested circuit board is connected with a control end of a single-pole single-throw switch, so that on-off of the single-pole single-throw switch is controlled by utilizing high / low level output by the power-on indication end, and a control chip is controlled to enter a voltage / resistance test mode; and the control chip outputs the voltage / resistance corresponding to the test point currently gated by the single-pole multi-throw switch according to the voltage of the input end of the control chip. According to the test circuit, a tester does not need to manually adjust the test mode according to whether the to-be-tested circuit board is powered on or not, and the test circuit can automatically switch the test mode according to the state of the to-be-tested circuit board, so that the electrical test efficiency of the to-be-tested circuit board is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical testing, in particular to a test circuit and a test device capable of automatically switching resistance and voltage tests. Background Art

[0002] Before powering on the circuit board, it is usually necessary to use a multimeter or other test equipment to conduct an electrical test on the circuit board. Generally, the tester needs to use the resistance range of the multimeter to test the resistance from various key signals on the circuit board to the ground to determine whether the resistance from the key signal to the ground is normal. Then, after the circuit board is powered on, the tester needs to adjust the test range of the multimeter and use the voltage range of the multimeter to test the voltage from various key signals on the circuit board to the ground to determine whether the voltage from the key signal to the ground is normal. In other words, the existing manual testing method requires the tester to manually adjust the multimeter range according to whether the circuit board is powered on, and the testing efficiency is low. Utility Model Content

[0003] The purpose of the utility model is to provide a test circuit and test equipment with automatic switching of resistance and voltage tests, so as to alleviate the technical problem of low efficiency of circuit board electrical testing in existing test methods.

[0004] In a first aspect, the utility model provides a test circuit for resistance voltage testing that can be automatically switched, comprising: a precision resistor, a single-pole single-throw switch, a single-pole multi-throw switch, and a control chip; a first end of the precision resistor is connected to a power supply end, a second end of the precision resistor is connected to a first end of the single-pole single-throw switch, a second end of the single-pole single-throw switch is respectively connected to a dynamic end of the single-pole multi-throw switch and an input end of the control chip, a control end of the single-pole single-throw switch is respectively connected to a power-on indication end of a circuit board to be tested and a mode control end of the control chip; multiple static ends of the single-pole multi-throw switch are respectively connected to multiple test points on the circuit board to be tested in a one-to-one correspondence, and the control end of the single-pole multi-throw switch is connected to a first output end of the control chip. The second output terminal of the control chip is connected to the output terminal of the test circuit; when the circuit board to be tested is not powered on, the power-on indication terminal of the circuit board to be tested outputs a low level, so that the single-pole single-throw switch is in a closed state, and the control chip enters a resistance test mode. The control chip determines the resistance value corresponding to the test point currently selected by the single-pole multi-throw switch according to the voltage of its input terminal, and outputs it through the second output terminal; when the circuit board to be tested is powered on, the power-on indication terminal of the circuit board to be tested outputs a high level, so that the single-pole single-throw switch is in an open state, and the control chip enters a voltage test mode. The control chip uses the voltage of its input terminal as the voltage corresponding to the test point currently selected by the single-pole multi-throw switch, and outputs it through the second output terminal.

[0005] Optionally, it also includes: a voltage reference source; the first end of the voltage reference source is connected to the power supply end, the second end of the voltage reference source is connected to the first end of the precision resistor, and the third end of the voltage reference source is connected to the ground end; the voltage reference source is used to provide a reference voltage.

[0006] Optionally, it also includes: an encoder; the input end of the encoder is connected to the second output end of the control chip, and the output end of the encoder is connected to the output end of the test circuit; the encoder is used to encode the data output from the second output end of the control chip and then output it.

[0007] Optionally, it also includes: a test mode indicator light; the test mode indicator light is connected in series between the second end of the precision resistor and the first end of the single-pole single-throw switch; when the control chip enters the resistance test mode, the test mode indicator light is on; when the control chip enters the voltage test mode, the test mode indicator light is off.

[0008] Optionally, the first output terminal of the control chip outputs different level combinations in a time-sharing manner to control the single-pole multi-throw switch to traverse and select multiple test points on the circuit board to be tested.

[0009] Optionally, the control chip includes: a single chip microcomputer.

[0010] Optionally, the precision resistor is a kilo-ohm level resistor.

[0011] In a second aspect, the present invention provides a test device capable of automatically switching a resistance voltage test, comprising a test circuit capable of automatically switching a resistance voltage test according to any one of the aforementioned embodiments.

[0012] Optionally, it also includes: a counter and an alarm; the input end of the counter is connected to the output end of the test circuit that can automatically switch the resistance voltage test, and the output end of the counter is connected to the control end of the alarm; the counter is used to count the data output by the output end of the test circuit, and when it is determined that the total number of data reaches a preset number, it outputs a trigger signal to the alarm; the alarm is used to sound an alarm when a trigger signal is received.

[0013] Optionally, it also includes: a display; the display is connected to the output end of the test circuit and is used to display data output by the output end of the test circuit.

[0014] The utility model provides a test circuit capable of automatically switching resistance and voltage tests. The test circuit connects the power-on indicator terminal of a circuit board to be tested to the control terminal of a single-pole, single-throw switch and the mode control terminal of a control chip. The circuit utilizes the high / low level output by the power-on indicator terminal to control the on / off of the single-pole, single-throw switch and control the control chip to enter a voltage / resistance test mode. This allows the control chip to output the voltage / resistance corresponding to the test point currently selected by the single-pole, multi-throw switch based on the voltage at its input terminal. This test circuit eliminates the need for the tester to manually adjust the test mode based on whether the circuit board is powered on or not. The test circuit can automatically switch test modes based on the status of the circuit board, thereby improving the efficiency of electrical testing of the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 A schematic diagram of a test circuit with automatic switching for resistance and voltage testing provided by an embodiment of the present utility model;

[0017] Figure 2 A schematic diagram of another test circuit with automatic switching for resistance and voltage testing provided by an embodiment of the present utility model;

[0018] Figure 3 A schematic diagram of another test circuit with automatic switching of resistance and voltage tests provided by an embodiment of the present utility model;

[0019] Figure 4 A schematic structural diagram of a test device capable of automatically switching resistance and voltage tests provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0020] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0022] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0023] Example 1

[0024] Figure 1 The utility model provides a schematic diagram of a resistance voltage test circuit with automatic switching, such as Figure 1 As shown, the resistance voltage test automatically switching test circuit (hereinafter referred to as the test circuit) includes: a precision resistor RF, a single-pole single-throw switch K1, a single-pole multi-throw switch K2 and a control chip CPU.

[0025] A first end of the precision resistor RF is connected to the power supply terminal VCC, a second end of the precision resistor RF is connected to a first end of the single-pole single-throw switch K1, a second end of the single-pole single-throw switch K1 is respectively connected to the active end of the single-pole multi-throw switch K2 and the input end of the control chip CPU, and a control end of the single-pole single-throw switch K1 is respectively connected to the power-on indication end PwrOn of the circuit board to be tested and the mode control end of the control chip CPU.

[0026] The multiple static ends of the single-pole multi-throw switch K2 are respectively connected to the multiple test points on the circuit board to be tested in a one-to-one correspondence. The control end of the single-pole multi-throw switch K2 is connected to the first output end of the control chip CPU, and the second output end of the control chip CPU is connected to the output end of the test circuit.

[0027] When the circuit board to be tested is not powered on, the power-on indication terminal PwrOn of the circuit board to be tested outputs a low level, so that the single-pole single-throw switch K1 is in a closed state and the control chip CPU enters the resistance test mode. The control chip CPU determines the resistance value corresponding to the test point currently selected by the single-pole multi-throw switch K2 according to the voltage at its input terminal, and outputs it through the second output terminal.

[0028] When the circuit board to be tested is powered on, the power-on indication terminal PwrOn of the circuit board to be tested outputs a high level, so that the single-pole single-throw switch K1 is in the disconnected state and the control chip CPU enters the voltage test mode. The control chip CPU uses the voltage at its input terminal as the voltage corresponding to the test point currently selected by the single-pole multi-throw switch K2, and outputs it through the second output terminal.

[0029] According to the above description of the test circuit structure and the circuit connection relationship between each structure, it can be seen that the power-on indicator terminal PwrOn of the circuit board to be tested controls the on and off of the single-pole single-throw switch K1 and the test mode of the control chip CPU. The control chip CPU controls the selection state of the single-pole multi-throw switch K2 through its first output terminal.

[0030] Specifically, when the power-on indicator terminal PwrOn of the circuit board to be tested outputs a low level, the single-pole single-throw switch K1 is controlled to close, and the control chip CPU enters the resistance test mode. At this time, the voltage provided by the power supply terminal VCC is divided by the precision resistor RF and the equivalent resistance to ground of the test point currently selected by the single-pole multi-throw switch K2, that is, Vx / Rx=Va / (Rx+R0), where Vx represents the voltage divided by the equivalent resistance to ground of the test point currently selected by the single-pole multi-throw switch K2, that is, the voltage at the input terminal of the control chip CPU, Rx represents the resistance corresponding to the test point currently selected by the single-pole multi-throw switch K2 (that is, the resistance of the equivalent resistance to ground of the test point), Va represents the power supply terminal VCC voltage, and R0 represents the resistance of the precision resistor RF. Therefore, as long as the voltage at the input terminal of the control chip CPU (that is, the moving terminal of the single-pole multi-throw switch K2) is determined, the control chip CPU can determine the resistance corresponding to the test point currently selected by the single-pole multi-throw switch K2 according to Ohm's law.

[0031] When the power-on indicator terminal PwrOn of the circuit board to be tested outputs a high level, the single-pole single-throw switch K1 is controlled to be disconnected, and the control chip CPU enters the voltage test mode. At this time, the circuit where the precision resistor RF is located is in an open circuit state, and the circuit board to be tested is in a powered-on state. There is a ground voltage at the test point currently selected by the single-pole multi-throw switch K2, and it is transmitted to the input terminal of the control chip CPU through the single-pole multi-throw switch K2. Therefore, the control chip CPU directly outputs the voltage at its input terminal as the voltage corresponding to the test point currently selected by the single-pole multi-throw switch K2.

[0032] Figure 1In the provided schematic diagram, the number of first output terminals of the control chip CPU is 2: S0 and S1, and the number of test points on the circuit board to be tested is 4: TP1 to TP4. Accordingly, the single-pole multi-throw switch K2 has four static terminals, which are connected one-to-one to the four test points. The control logic of the control chip CPU can be such that when the two first output terminals {S0, S1} respectively output {0, 0}, the single-pole multi-throw switch K2 is controlled to select test point TP1; when {S0, S1} respectively output {0, 1}, the single-pole multi-throw switch K2 is controlled to select test point TP2; when {S0, S1} respectively output {1, 0}, the single-pole multi-throw switch K2 is controlled to select test point TP3; and when {S0, S1} respectively output {1, 1}, the single-pole multi-throw switch K2 is controlled to select test point TP4. This embodiment does not specifically limit the number of first output terminals of the control chip CPU, as long as it can achieve time-sharing selection of multiple test points on the circuit to be tested.

[0033] The utility model provides a test circuit capable of automatically switching resistance and voltage tests. The test circuit connects the power-on indicator terminal PwrOn of a circuit board under test to the control terminal of a single-pole, single-throw switch K1 and the mode control terminal of a control chip CPU. The circuit utilizes the high / low level output by the power-on indicator terminal to control the on / off of the single-pole, single-throw switch K1 and control the control chip CPU to enter a voltage / resistance test mode. This circuit then causes the control chip CPU to output the voltage / resistance corresponding to the test point currently selected by the single-pole, multi-throw switch K2 based on the voltage at its input terminal. This test circuit eliminates the need for the tester to manually adjust the test mode based on whether the circuit board under test is powered on or not. The circuit can automatically switch test modes based on the state of the circuit board under test, thereby improving the efficiency of electrical testing of the circuit board under test.

[0034] In an optional embodiment, the control chip CPU includes a single chip microcomputer. Based on this, the control chip CPU can control the test point selected by the single-pole multi-throw switch K2 through the GPIO.

[0035] In an optional implementation, to ensure circuit test safety and test accuracy, the precision resistor RF is a kilo-ohm level resistor.

[0036] In an optional embodiment, as Figure 2 As shown, the test circuit capable of automatically switching the resistance voltage test further includes: a voltage reference source U1.

[0037] A first terminal of the voltage reference source U1 is connected to the power supply terminal VCC, a second terminal of the voltage reference source U1 is connected to the first terminal of the precision resistor RF, and a third terminal of the voltage reference source U1 is connected to the ground terminal GND; the voltage reference source U1 is used to provide a reference voltage.

[0038] Specifically, in order to further improve the test accuracy of the test circuit, a voltage reference source U1 can be connected in series between the power supply terminal VCC and the precision resistor RF. Compared with the power supply voltage provided by the power supply terminal VCC, the voltage reference source U1 can provide a reference voltage with higher accuracy, thereby improving the accuracy of the resistance corresponding to the test point output by the control chip CPU. When using the voltage reference source U1, the formula used by the control chip CPU to determine the resistance value corresponding to the test point currently selected by the single-pole multi-throw switch K2 is adjusted accordingly: Vx / Rx=Vref / (Rx+R0), where Vref represents the voltage output by the second end of the voltage reference source U1 (that is, the voltage output end of the voltage reference source U1).

[0039] In an optional embodiment, the test circuit capable of automatically switching resistance and voltage tests further includes: an encoder.

[0040] The input end of the encoder is connected to the second output end of the control chip CPU, and the output end of the encoder is connected to the output end of the test circuit.

[0041] The encoder is used for encoding the data outputted from the second output terminal of the control chip CPU and then outputting the data.

[0042] Given that the resistance value of the equivalent resistance to ground of the test point has a certain accuracy range, the corresponding voltage to ground also has a certain variation range after the circuit board is powered on. If the test result is output directly, it is necessary to further determine whether the test result is within the normal data interval of the corresponding test point. Therefore, this embodiment further uses an encoder to encode the above data after the second output terminal of the control chip CPU outputs the data. The user can set the encoding rules in advance so that the data belonging to a data interval have the same encoding result, thereby simplifying the method of determining the test result. In other words, by agreeing on the return value of the circuit test and returning the electrical test result of this circuit board, the problem of manual inefficient measurement and judgment can be solved, thereby improving the test efficiency of the circuit board. If the control chip CPU selects a single-chip microcomputer, the function of the encoder can also be implemented by the single-chip microcomputer.

[0043] In an optional embodiment, as Figure 3 As shown, the test circuit capable of automatically switching the resistance and voltage test further includes: a test mode indicator light Light.

[0044] The test mode indicator Light is connected in series between the second terminal of the precision resistor RF and the first terminal of the single-pole, single-throw switch K1. When the control chip CPU enters the resistance test mode, the test mode indicator Light turns on; when the control chip CPU enters the voltage test mode, the test mode indicator Light turns off.

[0045] In order to improve the convenience of testing the circuit, a test mode indicator light Light can be added to the circuit where the precision resistor RF is located. Specifically, when the control chip CPU enters the resistance test mode, it means that the circuit board to be tested is in an unpowered state, the power-on indication terminal PwrOn of the circuit board to be tested outputs a low level, and the single-pole single-throw switch K1 is in a closed state. At this time, the circuit where the precision resistor RF is located is in a conductive state, and the test mode indicator light Light is on; when the control chip CPU enters the voltage test mode, it means that the circuit board to be tested is in a powered state, the power-on indication terminal PwrOn of the circuit board to be tested outputs a high level, and the single-pole single-throw switch K1 is in a disconnected state. At this time, the circuit where the precision resistor RF is located is in an open circuit state, and the test mode indicator light Light is on and off.

[0046] In an optional embodiment, the first output terminal of the control chip CPU outputs different level combinations in a time-sharing manner to control the single-pole multi-throw switch K2 to traverse and select multiple test points on the circuit board to be tested.

[0047] by Figure 1 For example, if the first output terminal of the control chip CPU outputs the following level combination in time-sharing: {0, 0}, {0, 1}, {1, 0}, {1, 1}, the single-pole multi-throw switch K2 can be controlled to traverse and select the following four test points on the circuit board to be tested: TP1, TP2, TP3, TP4.

[0048] In summary, the test circuit provided in this embodiment can be used to automatically test various resistances and voltages on large-scale digital circuit boards, eliminating the need for manual point-by-point electrical testing and improving product testability and maintenance efficiency. For circuit boards that cannot be manually tested, an automated inspection solution is provided, enabling automatic switching between resistance and voltage test modes. This allows for automated resistance and voltage testing at multiple test points on the circuit board under test, encoding and reporting the test results, thereby improving product testability and maintainability.

[0049] Example 2

[0050] An embodiment of the present utility model provides a test device capable of automatically switching a resistance voltage test. The test device includes the test circuit capable of automatically switching a resistance voltage test provided by the first embodiment.

[0051] In an optional embodiment, as Figure 4 As shown, the resistance voltage test and the automatically switchable test equipment further include: a counter 100 and an alarm 200 .

[0052] The input end of the counter 100 is connected to the output end of the test circuit capable of automatic switching of resistance and voltage tests, and the output end of the counter 100 is connected to the control end of the alarm 200 .

[0053] The counter 100 is used to count the data outputted from the output terminal of the test circuit, and output a trigger signal to the alarm 200 when it is determined that the total number of data reaches a preset number.

[0054] The alarm 200 is used to sound an alarm when a trigger signal is received.

[0055] In order to improve the convenience of the test equipment with automatic switching of resistance and voltage tests, the preset number corresponding to the counter 100 can be pre-configured. Taking the circuit board to be tested with 4 test points as an example, to complete the resistance and voltage tests of the 4 test points, 4 resistance results and 4 voltage results should be output. Therefore, the preset number can be selected to be 4 or 8. If it is configured to be 4, an alarm will be issued after the resistance or voltage test is completed; if it is configured to be 8, an alarm will be issued after the resistance and voltage tests are completed.

[0056] In an optional embodiment, the test device capable of automatically switching resistance and voltage tests further includes: a display.

[0057] The display is connected to the output end of the test circuit and is used for displaying data outputted by the output end of the test circuit.

[0058] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0059] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0060] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0061] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A resistance voltage test circuit with automatic switching, characterized in that: include: Precision resistors, single-pole single-throw switches, single-pole multi-throw switches and control chips; The first end of the precision resistor is connected to the power supply end, the second end of the precision resistor is connected to the first end of the single-pole single-throw switch, the second end of the single-pole single-throw switch is respectively connected to the dynamic end of the single-pole multi-throw switch and the input end of the control chip, and the control end of the single-pole single-throw switch is respectively connected to the power-on indication end of the circuit board to be tested and the mode control end of the control chip; The multiple static ends of the single-pole multi-throw switch are respectively connected to the multiple test points on the circuit board to be tested in a one-to-one correspondence, the control end of the single-pole multi-throw switch is connected to the first output end of the control chip, and the second output end of the control chip is connected to the output end of the test circuit; When the circuit board to be tested is not powered on, the power-on indication terminal of the circuit board to be tested outputs a low level, so that the single-pole single-throw switch is in a closed state, and the control chip enters a resistance test mode. The control chip determines the resistance value corresponding to the test point currently selected by the single-pole multi-throw switch according to the voltage of its input terminal, and outputs it through the second output terminal; When the circuit board to be tested is powered on, the power-on indication terminal of the circuit board to be tested outputs a high level, so that the single-pole single-throw switch is in an off state and the control chip enters a voltage test mode. The control chip uses the voltage at its input terminal as the voltage corresponding to the test point currently selected by the single-pole multi-throw switch, and outputs it through the second output terminal.

2. The resistance voltage test automatically switchable test circuit according to claim 1, characterized in that: Also includes: Voltage reference source; The first end of the voltage reference source is connected to the power supply end, the second end of the voltage reference source is connected to the first end of the precision resistor, and the third end of the voltage reference source is connected to the ground end; The voltage reference source is used to provide a reference voltage.

3. The resistance voltage test automatically switchable test circuit according to claim 1, characterized in that: Also includes: encoder; The input end of the encoder is connected to the second output end of the control chip, and the output end of the encoder is connected to the output end of the test circuit; The encoder is used to encode the data output from the second output terminal of the control chip and then output it.

4. The resistance voltage test circuit capable of automatic switching according to claim 1, characterized in that: Also includes: Test mode indicator light; The test mode indicator light is connected in series between the second end of the precision resistor and the first end of the single-pole single-throw switch; When the control chip enters the resistance test mode, the test mode indicator light turns on; When the control chip enters the voltage test mode, the test mode indicator light goes out.

5. The resistance voltage test circuit capable of automatic switching according to claim 1, characterized in that: The first output terminal of the control chip outputs different level combinations in a time-sharing manner to control the single-pole multi-throw switch to traverse and select multiple test points on the circuit board to be tested.

6. The resistance voltage test automatically switchable test circuit according to claim 1, characterized in that: The control chip includes: a single chip microcomputer.

7. The resistance voltage test circuit capable of automatic switching according to claim 1, characterized in that: The precision resistor is a resistor in the kilo-ohm range.

8. A resistance voltage test device with automatic switching, characterized in that: A test circuit comprising the resistance voltage test according to any one of claims 1 to 7 capable of automatic switching.

9. The resistance voltage test automatically switchable test equipment according to claim 8, characterized in that: Also includes: counters and alarms; The input end of the counter is connected to the output end of the test circuit capable of automatically switching the resistance voltage test, and the output end of the counter is connected to the control end of the alarm; The counter is used to count the data outputted from the output end of the test circuit, and output a trigger signal to the alarm when it is determined that the total number of data reaches a preset number; The alarm is used to sound an alarm when receiving the trigger signal.

10. The resistance voltage test automatically switchable test equipment according to claim 8, characterized in that: Also includes: monitor; The display is connected to the output end of the test circuit and is used to display data output by the output end of the test circuit.

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