A relay electrical parameter tester, auxiliary test module and test method

Abstract

This invention discloses a relay electrical parameter tester, an auxiliary test module, and a test method. The tester is used to test the operating voltage and release voltage of a relay. Its configuration mainly includes: an auxiliary test module, comprising connection point A for connecting the normally closed contact J-D1 of the relay under test J, connection point B for connecting the normally closed contact J-D2 of the relay under test J, a first switching device J2, connection point C connecting the normally closed contact J2-D of the first switching device J2, and a first driving circuit for controlling the operation of the first switching device J2; the normally open contact J2-H of the first switching device J2 is connected to a power supply, and the switching contact J2-Z is used for connecting the normally open contact of the relay under test J; a contact status indication module for indicating the contact status of the relay under test; and a display module for displaying the operating voltage and release voltage of the relay under test. This invention enables the testing of electrical parameters of sealed DC electromagnetic relays with no normally open contact lead-out terminal.

Description

Technical Field

[0001] This invention belongs to the field of electronic instruments and relates to a relay electrical parameter tester, an auxiliary test module, and a test method. It is applied to the electrical parameter testing of a sealed DC electromagnetic relay with a non-operating contact lead-out structure and can test the operating voltage and release voltage of the relay. Background Technology

[0002] For general-purpose DC electromagnetic relays, all contacts have leads extending out of the relay body. Electrical parameters, including operating voltage and release voltage, can be tested by directly contacting the leads of each contact. For example... Figure 1 The relay structure shown, with its contact leads, allows for direct testing of its electrical parameters via these leads. Taking the testing of the operating voltage and release voltage of a relay with two sets of changing contacts as an example... Figure 2 As shown, the coil of the relay J under test is connected to V1 (an adjustable test power supply). The two normally closed contacts and the two normally open contacts of J are connected to a contact status indicator circuit. The voltage at the contact points of the two switching contacts is V2. M is a voltmeter that displays the value of V1 in real time. D1, D2, D3, and D4 are status indicator lights for the two normally closed contacts and two normally open contacts of the relay under test. The test procedure is as follows:

[0003] Adjust V1 so that its output is zero. At this time, J is not excited and is in the released state. D1 and D2 are lit, and D3 and D4 are turned off.

[0004] Adjust V1 so that its output gradually increases from zero. During this process, J remains unenergized and in a released state, with D1 and D2 lit and D3 and D4 off. When V1 increases to a certain value, J is energized, D1 and D2 turn off, and D3 and D4 light up. The V1 value at this point is the operating voltage value of J, which is read by M.

[0005] After J is activated, V1 is adjusted so that its output gradually decreases. During this process, J remains energized and in an energized state, while D1 and D2 are off, and D3 and D4 are on. When V1 decreases to a certain value, J is released, D1 and D2 are on, and D3 and D4 are off. The V1 value at this point is the release voltage value of J, which is read by M.

[0006] However, for DC electromagnetic relays without a normally open contact lead, the internal circuitry of this relay structure is as follows: Figure 3 As shown. For relays with this structure, direct contact testing of the leads at each contact point is not possible, making it currently impossible to measure the electrical parameters of relays with this structure. Summary of the Invention

[0007] The purpose of this invention is to provide a relay electrical parameter tester, which can perform electrical parameter tests on DC relays without normally open contacts, including testing their operating voltage and release voltage. Its configuration mainly includes:

[0008] The auxiliary testing module includes connection point A for connecting the normally closed contact J-D1 of the relay under test J, connection point B for connecting the normally closed contact J-D2 of the relay under test J, a first switching device J2, connection point C connected to the normally closed contact J2-D of the first switching device J2, and a first driving circuit for controlling the operation of the first switching device J2; the normally open contact J2-H of the first switching device J2 is connected to the power supply, and the switching contact J2-Z is used for connecting the normally open contact of the relay under test J;

[0009] A contact status indicator module, used to indicate the contact status of the relay under test, is connected to the auxiliary test module via connection point A, connection point B, and connection point C; and

[0010] The display module is used to display the operating voltage and release voltage of the relay under test.

[0011] In some embodiments, the tester provided by the present invention is further configured with an overcurrent protection module for cutting off the power supply required for testing to the relay under test when the coil current value of the relay under test exceeds a set value. When the current in the drive power supply circuit of the relay under test exceeds the rated current, the relay under test is effectively protected, avoiding the situation where the relay under test is burned out due to overcurrent.

[0012] In some embodiments, the overcurrent protection module includes a resistor R1, a comparator IC, a relay J1, and a controllable switch BG. The resistor R1 is used to acquire the voltage corresponding to the coil current of the relay under test and input this voltage to the non-inverting input terminal of the comparator IC. The inverting input terminal of the comparator IC receives a reference voltage. One end of the coil of the relay J1 is connected to a power supply, and the other end is grounded via the controllable switch BG. The normally closed contact J1-1 of the relay J1 is connected to the power supply circuit providing the power required for the test. The conduction of the controllable switch BG is controlled by the output of the comparator IC. When the comparator IC is turned on, the relay J1 is energized, the normally closed contact J1-1 is opened, and the power supply required for the test is cut off. Using discrete components to construct the overcurrent protection module improves the overcurrent protection response rate, provides better stability, and reduces cost.

[0013] In some embodiments, the tester provided by the present invention further includes an indicator light D1 for overcurrent indication. The indicator light D1 is connected to the power supply through the normally open contact J1-2 of the relay J1, so as to realize overcurrent protection and issue an overcurrent warning at the same time, and can effectively avoid the inability to quickly determine the cause of the fault when the tester cannot work due to overcurrent and needs to be repaired.

[0014] In some embodiments, the tester provided by the present invention further includes a transient suppression diode (TVB) connected in parallel across the coil of the relay under test. This effectively prevents damage to the excitation power supply caused by the high back electromotive force (reverse surge voltage) generated by the stored inductive energy when the relay coil under test is de-energized.

[0015] In some embodiments, the tester provided by the present invention further includes a first AC / DC conversion circuit AC / DC1, a second AC / DC conversion circuit AC / DC2, and a third AC / DC conversion circuit AC / DC3. The first AC / DC conversion circuit AC / DC1 outputs an adjustable DC regulated power supply, which is used to connect to the coil of the relay J under test. The second AC / DC conversion circuit AC / DC2 and the third AC / DC conversion circuit AC / DC3 respectively output fixed DC regulated power supplies V2 and V3, which are used as power supplies for other electrical components.

[0016] In some embodiments, the contact status indication module includes LEDs D2, D3, and D4. The anodes of LEDs D2, D3, and D4 are connected to a power supply, and their cathodes are connected to connection points A, B, and C, respectively. The structure is simple, the status indication is intuitive, and different colors further enhance the intuitive judgment of the status of the relay contacts under test.

[0017] In some embodiments, the contact status indication module further includes a second driving circuit, a third driving circuit, and a fourth driving circuit for driving the light-emitting diodes D2, D3, and D4 to light up and turn off, respectively, wherein the second driving circuit, the third driving circuit, and the fourth driving circuit are respectively connected to the connection point A, the connection point B, and the connection point C.

[0018] A second aspect of this invention aims to provide an auxiliary testing module, which includes a connection point A for connecting the normally closed contact J-D1 of the relay under test J, a connection point B for connecting the normally closed contact J-D2 of the relay under test J, a first switching device J2, a connection point C connected to the normally closed contact J2-D of the first switching device, and a first driving circuit for controlling the operation of the first switching device; the normally open contact J2-H of the first switching device is connected to the power supply, and the switching contact J2-Z is used for connecting the normally open contact of the relay under test J.

[0019] In some embodiments, the first driving circuit includes a controllable switch BG1 and a diode to prevent power supply short circuit. The control terminal of the controllable switch BG1 is connected to the connection point A via the diode, one bias terminal is connected to the positive power supply via the diode, and the other bias terminal is connected to the power supply ground.

[0020] The third aspect of this invention aims to provide a method for testing the electrical parameters of a relay. This method is used to test the release voltage and operating voltage of a relay. The normally closed contact and the changing contact of the relay J under test are connected to the tester provided by this invention. The coil of the relay J under test is then connected to an adjustable test power supply V1. The power supply V1 is adjusted so that its output is zero, and the relay J under test is not energized and is in a released state. The contact state indicator module indicates the current state accordingly. The power supply V1 is adjusted so that its output gradually increases from zero. During this process, the relay J under test is still not energized and remains in a released state, and the contact state indicator module continues to display the current state. When the power supply V1 increases to a certain value, the relay J under test is energized, and the indication state of the contact state indicator module changes. At this time, the value of the power supply V1 is the operating voltage of the relay J under test, which is obtained by the display module.

[0021] After the relay under test J is activated, the power supply V1 is adjusted so that its output gradually decreases. During this process, the relay under test J is still energized and remains in the energized state. The contact status indicator module continues to display the current state. When V1 decreases to a certain value, the relay under test J is released, and the contact status indicator module indicates the state transition. At this time, the value of the power supply V1 is the release voltage of the relay under test J, which is obtained by the display module.

[0022] The beneficial effects of adopting the technical solution of the present invention are: the tester provided by the present invention can be used to test the electrical parameters of a sealed DC electromagnetic relay with no normally open contact lead-out terminal, and can test the operating voltage and release voltage of the relay. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention. In the drawings:

[0024] Figure 1 This is a schematic diagram of the relay contact structure with leads as described in this invention;

[0025] Figure 2 To Figure 1 The diagram shows the test principle for testing the electrical parameters of the relay contacts shown.

[0026] Figure 3 This is an internal circuit diagram of the relay without a normally open contact lead-out terminal as described in this invention;

[0027] Figure 4-5 The circuit schematic diagram of the tester provided by the present invention;

[0028] Figure 6 This is a block diagram of the overcurrent protection circuit described in this invention;

[0029] Figure 7 This is a schematic diagram illustrating the transient suppression principle of the relay coil described in this invention. Detailed Implementation

[0030] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be comprehensive and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. In the drawings, the dimensions of some elements may be exaggerated or modified for clarity. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0031] Furthermore, the described features and structures can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of the specific details described, or other methods, elements, etc., can be employed. In other instances, well-known structures, methods, or operations are not shown or described in detail to avoid obscuring various aspects of this disclosure.

[0032] For current DC electromagnetic relays without a normally open contact lead, the internal circuit connection relationship of this type of relay structure is as follows: Figure 3 As shown, its parameters cannot be directly tested by connecting the leads as with DC relays that have contact leads, thus requiring the construction of an external test circuit. Therefore, this invention provides a relay electrical parameter tester, which can test parameters such as... Figure 3 The electrical parameters of the relay with the non-open contact lead shown are tested. Using this tester, the operating voltage and release voltage of the relay with the non-open contact lead can be measured.

[0033] Combination Figure 4 , 5 The structure of the electrical parameter tester is disclosed by way of example, including an auxiliary test module, a contact status indication module for indicating the contact status of the relay under test, and a display module for displaying the operating voltage and release voltage of the relay under test J. The auxiliary test module includes connection point A for the normally closed contact J-D1 of the relay under test J to connect, connection point B for the normally closed contact J-D2 of the relay under test J to connect, a first switching device, connection point C connected to the normally closed contact J2-D of the first switching device, and a first drive circuit for controlling the operation of the first switching device; the normally open contact J2-H of the first switching device is connected to power supply V2, and the changeover contact J2-Z is used for the changeover contact of the relay under test J to connect; the contact status indication module is connected to connection points A, B, and C.

[0034] This testing instrument is used for, for example Figure 3 When testing a relay with a non-opening contact lead as shown, if... Figure 4 , 5 As shown. The normally closed contacts J-D1 and J-D2 of the relay under test J are connected to connection points A and B of the auxiliary test module, respectively. Normally closed contact J-D1 is also connected to the first drive circuit. The changeover contact J-Z1 of the relay under test J is connected to power supply V2, and the changeover contact J-Z2 is connected to the changeover contact J2-Z of the first switching device. The coil of the relay under test J is connected to the adjustable power supply V1. Following the above connection method, the coil of the relay under test J is connected to the output terminal of the adjustable power supply V1, and the two normally closed contacts and one changeover contact are connected to the connection points of the auxiliary test module. After the relay under test J is connected, the electrical parameter test begins. The test process is as follows:

[0035] Adjusting power supply V1 to zero deactivates the relay J under test, leaving it in a released state. The contact status indicator module then indicates this state. As power supply V1 gradually increases from zero, the relay J remains unactivated and in a released state, and the contact status indicator module continues to indicate the current state. When power supply V1 reaches a certain value, the relay J is activated, and the contact status indicator module changes its state. The value of power supply V1 at this point is the operating voltage of the relay J, which is obtained by the display module.

[0036] After the relay under test J is activated, the power supply V1 is adjusted so that its output gradually decreases. During this process, the relay under test J is still energized and remains in the energized state. The contact status indicator module continues to indicate the current state. When the power supply V1 decreases to a certain value, the relay under test J is released, and the contact status indicator module indicates the state transition. At this time, the value of the power supply V1 is the release voltage of the relay under test J, which is obtained by the display module.

[0037] The principle of this tester is as follows: When the relay J under test is not energized and is in the released state, its normally closed contact is closed while its normally open contact is open. The normally closed contacts J-D1 and J-Z1, V2, which are connected to A, are connected, and the corresponding status indication module is activated. Simultaneously, J-D1, connected to V2, drives the first drive circuit through D1, energizing the first switching device. Its changing contact J2-Z is connected to its normally open contacts J2-H and V2, and also to J-Z2, J-D2, and B. The corresponding status indication module is activated. At the same time, the normally closed contact J2-D of the first switching device is open, and connection point C is left floating; the corresponding contact status indication is not activated. In other words, when the relay J under test is in the released state, its two normally closed contact status indications are activated, while its auxiliary normally open contact status indication is not activated.

[0038] When the relay J under test is energized and in the energized state, its normally closed contact opens and its normally open contact closes. The normally closed contacts J-D1 and J-Z1, V2 connected to A open and remain suspended, and the corresponding state indication module stops indicating. Simultaneously, the first drive circuit closes, releasing the first switching device. Its switching contact J2-Z disconnects from J2-H, V2, and the other normally closed contact J-D2 connected to B also disconnects from V2, and the corresponding state indication module stops indicating. Also simultaneously, the auxiliary contact input terminal C is connected through two normally open contacts J-D, J2-Z, J-Z2, J (internal connections without leads), J-Z1, V2, and the two normally open contacts J-Z1, V2 of the first switching device, and the corresponding state indication module starts indicating. In other words, when the relay J under test is in the energized state, its two normally closed contact state indications stop, while its auxiliary normally open contact state indication starts.

[0039] To intuitively determine the status of the J contact of the relay under test, the contact status indicator module of this disclosure is configured to include LEDs D2, D3, and D4. The anodes of LEDs D2, D3, and D4 are connected to the power supply, and the cathodes are connected to connection points A, B, and C, respectively. D2, D3, and D4 serve as auxiliary status indicator lights for the two normally closed contacts and the two connected normally open contacts of the relay under test, respectively.

[0040] In this disclosure, the contact status indication module further includes a second, third, and fourth driving circuit for driving LEDs D2, D3, and D4 to light up and turn off. The second, third, and fourth driving circuits are respectively connected to connection points A, B, and C. The second, third, and fourth driving circuits are configured to include a controllable switch BG2 for driving D2, a controllable switch BG3 for driving D3, and a controllable switch BG4 for driving D4. To ensure the driving reliability of controllable switches BG2-BG4, each controllable switch is equipped with a voltage divider circuit mainly composed of resistors. This voltage divider circuit is connected in series between connection points A, B, and C and circuit ground, dividing the power supply connected to connection points A, B, and C to provide a suitable bias to the control terminals of controllable switches BG2-BG4, enabling them to conduct and grounding the cathodes of D2-D4. Figure 5 As shown, R1 / R2 / BG2, R3 / R4 / BG3, and R5 / R6 / BG4 are their respective driving circuits. They are lit when the corresponding contacts are connected and turned off otherwise, thus serving as contact status indicators.

[0041] Specifically, D2 and D3 illuminate when the relay under test J is in the released state and turn off when it is in the activated state; D4 illuminates when the relay under test J is in the activated state and turns off when it is in the released state. In detail: During the test, when the power supply V1 output is zero, the relay under test J is not energized and is in the released state; D2 and D3 illuminate, and D4 turns off. Adjusting the power supply V1, its output gradually increases from zero. During this process, the relay under test J remains unenergized and in the released state; D2 and D3 illuminate, and D4 turns off. When the power supply V1 increases to a certain value, the relay under test J is energized, the contact status indicator lights change, D2 and D3 turn off, and D4 illuminates. After the relay under test J activates, adjusting the power supply V1, its output gradually decreases. During this process, the relay under test J remains energized and in the energized state; D2 and D3 turn off, and D4 illuminates. When the power supply V1 decreases to a certain value, the relay J under test is released, the contact status indicator lights change, D2 and D3 light up, and D4 goes out.

[0042] During the operating voltage and release voltage tests, an overcurrent situation may occur in the coil circuit of the relay under test (J). To protect the coil of the relay under test (J) or the drive power supply from damage, the tester disclosed herein is also equipped with an overcurrent protection module. This module is used to cut off the power supply (adjustable power supply V1) required for testing to the relay under test when the current value in the coil circuit of the relay under test exceeds a set value.

[0043] like Figure 4 As shown, the overcurrent protection module configured in this disclosure includes a resistor R1, a comparator IC, a relay J1, and a controllable switch BG. The resistor R1 is used to acquire the voltage corresponding to the current in the coil circuit of the relay under test and input the voltage to the non-inverting input terminal of the comparator IC. The inverting input terminal of the comparator IC is input with a reference voltage. One end of the coil of the relay J1 is connected to the power supply, and the other end is grounded through the controllable switch BG. The normally closed contact J1-1 of the relay J1 is connected to the power supply circuit that provides the power required for the test. When the controllable switch BG is turned on, the power supply required for the test is cut off.

[0044] Figure 6 As shown, the working principle of this overcurrent protection module is as follows: When the current in the drive circuit of the relay coil under test exceeds the set value, the voltage at the positive terminal of the IC comparator input (i.e., the voltage drop across R1) is greater than the voltage at the negative terminal, the comparator outputs a high level, triggering BG to conduct and remain active. The overcurrent protection relay J1 is energized and operates, maintaining its active state. The normally closed contact J1-1 of J1 opens, cutting off the input terminal of the coil power supply. The negative terminal voltage of the comparator IC is provided by power supply V3 through a resistor divider. To meet different overcurrent conditions, power supply V3 is divided by a resistor with a fixed resistance and a potentiometer to form the negative terminal voltage of the comparator IC. By adjusting the potentiometer, the negative terminal voltage of the comparator IC can be adjusted to set different thresholds to meet different overcurrent conditions.

[0045] To enable overcurrent alarm, the overcurrent protection module is also equipped with an indicator light D1 for overcurrent indication. Indicator light D1 is connected to the power supply via the normally open contact J1-2 of relay J1. When an overcurrent occurs in the coil circuit of the relay under test J, the power supply to the coil of the relay under test J is cut off, and at the same time, the normally open contact J1-2 of J1 is closed, connecting to power supply V2, causing the overcurrent indicator light D1 to light up and trigger an alarm.

[0046] Furthermore, at the moment the relay coil under test is de-energized, its stored inductive energy generates a very high back electromotive force (reverse surge voltage), typically about eight times the supply voltage. If not suppressed, this voltage could damage the relay coil's excitation power supply. Therefore, the test instrument disclosed herein is also equipped with a transient voltage suppressor diode (TVS). When its terminals are subjected to a reverse transient high-energy surge, it can rapidly change the high impedance between its terminals to a low impedance, absorbing up to several kilowatts of power and clamping the voltage between its terminals to a small, predetermined value, thus preventing damage to the coil's excitation power supply.

[0047] Please refer to Figure 7 By connecting the TVS in parallel across the coil of the relay J under test, its transient suppression function can eliminate the reverse surge voltage generated by the instantaneous de-excitation of the coil, which can damage the excitation power supply V1 and improve the reliability of the tester.

[0048] The first driving circuit disclosed herein is used to drive a first switching device to operate. It includes a controllable switch BG1 and a diode to prevent short circuits in the power supply. The control terminal of the controllable switch BG1 is connected to point A via the diode, one bias terminal is connected to the power supply via the diode, and the other bias terminal is connected to circuit ground. This first switching device is configured as a relay J2, exhibiting strong controllability and fast response.

[0049] Furthermore, the tester disclosed herein also includes a first AC / DC conversion circuit AC / DC1, a second AC / DC conversion circuit AC / DC2, and a third AC / DC conversion circuit AC / DC3. The first AC / DC conversion circuit AC / DC1 has an adjustable output power supply, which is an adjustable DC regulated power supply (adjustable power supply V1), to power the coil of the relay under test. It has the characteristics of adjusting from 0V and displaying the voltage value in real time with a display module. The second AC / DC conversion circuit AC / DC2 and the third AC / DC conversion circuit AC / DC3 have fixed output DC regulated power supplies V2 and V3, respectively, to power other electrical components. Specifically, AC / DC2 output voltage V2 is the contact load voltage; AC / DC output voltage V3 is the power supply for the protection circuit.

[0050] The controllable switch in this disclosure can be any type, such as a silicon controlled rectifier (SCR), a transistor, a field-effect transistor (FET), an IGBT, etc.

[0051] In this disclosure, the display module can be configured as any device capable of displaying voltage, such as a voltmeter M, an oscilloscope, etc.

[0052] The auxiliary testing module in the technical solution disclosed herein can accurately reflect the operating state of the normally open contact of the electromagnetic relay without a lead-out terminal, thereby realizing the electrical parameter testing of the electromagnetic relay without a lead-out terminal.

[0053] The configured overcurrent protection module provides a certain overcurrent protection function for the excitation power supply of the relay coil under test. When the current value of the relay coil under test exceeds the set value, the excitation power supply will be cut off and an alarm will be triggered to protect the coil excitation power supply from overcurrent damage.

[0054] This disclosure has been described with reference to the foregoing embodiments; however, these embodiments are merely examples for implementing this disclosure. It must be noted that the disclosed embodiments do not limit the scope of this disclosure. On the contrary, any changes and modifications made without departing from the spirit and scope of this disclosure are within the scope of patent protection of this disclosure.

Claims

1. A relay electrical parameter tester characterized by, This tester is used to test the operating voltage and release voltage of a sealed DC electromagnetic relay with no normally open contact lead-out terminal. Its configuration mainly includes: The auxiliary testing module includes connection point A for the normally closed contact J-D1 of the relay under test J, connection point B for the normally closed contact J-D2 of the relay under test J, a first switching device J2, connection point C connected to the normally closed contact J2-D of the first switching device, and a first driving circuit for controlling the operation of the first switching device; the normally open contact J2-H of the first switching device is connected to power supply V2, the changeover contact J2-Z of the first switching device is used to connect to the changeover contact J-Z2 of the relay under test J; the changeover contact J-Z1 of the relay under test J is connected to power supply V2, and the coil of the relay under test J is connected to an adjustable power supply V1; A contact status indicator module, used to indicate the contact status of the relay under test, is connected to the auxiliary test module via connection point A, connection point B, and connection point C; and The display module is used to display the operating voltage and release voltage of the relay under test.

2. The relay electric parameter tester according to claim 1, characterized in that, It is also equipped with an overcurrent protection module that cuts off the power supply required for testing to the relay under test when the coil current value of the relay under test exceeds the set value.

3. The relay electric parameter tester according to claim 2, characterized in that, The overcurrent protection module includes a resistor R1, a comparator IC, a relay J1, and a controllable switch BG. The resistor R1 is used to acquire the voltage corresponding to the current in the coil circuit of the relay under test and input this voltage to the non-inverting input terminal of the comparator IC. The inverting input terminal of the comparator IC is input with a reference voltage. One end of the coil of the relay J1 is connected to the power supply, and the other end is grounded through the controllable switch BG. The normally closed contact J1-1 of the relay J1 is connected to the power supply circuit that provides the power required for the test. When the controllable switch BG is turned on, the relay J1 is energized, and the normally closed contact J1-1 of J1 is opened, cutting off the power supply required for the test.

4. The relay electrical parameter tester according to claim 3, characterized in that, It also includes an indicator light D1 for overcurrent indication, wherein the indicator light D1 is connected to the power supply via the normally open contact J1-2 of the relay J1.

5. The relay electrical parameter tester according to claim 1, characterized in that, It also includes a transient suppression diode (TVB) for use in parallel across the coil of the relay under test.

6. The relay electrical parameter tester according to claim 1, characterized in that, It also includes a first AC / DC converter circuit AC / DC1, a second AC / DC converter circuit AC / DC2, and a third AC / DC converter circuit AC / DC3. The first AC / DC converter circuit AC / DC1 outputs an adjustable DC regulated power supply, which is used to connect to the coil of the relay J under test. The second AC / DC converter circuit AC / DC2 and the third AC / DC converter circuit AC / DC3 respectively output fixed DC regulated power supplies V2 and V3, which are used as power supplies for other electrical components.

7. The relay electrical parameter tester according to claim 1, characterized in that, The contact status indicator module includes LEDs D2, D3, and D4. The anodes of LEDs D2, D3, and D4 are connected to a power supply, and the cathodes are connected to connection points A, B, and C, respectively.

8. The relay electrical parameter tester according to claim 7, characterized in that, The contact status indication module further includes a second driving circuit, a third driving circuit, and a fourth driving circuit for driving the LEDs D2, D3, and D4 to light up and turn off, respectively. The second driving circuit, the third driving circuit, and the fourth driving circuit are respectively connected to the connection point A, the connection point B, and the connection point C.

9. An auxiliary testing module, characterized in that, This module is the auxiliary testing module in the relay electrical parameter tester according to any one of claims 1-8.

10. The auxiliary testing module according to claim 9, characterized in that, The first driving circuit includes a controllable switch BG1 and a diode to prevent power supply short circuit. The control terminal of the controllable switch BG1 is connected to the connection point A via the diode, one bias terminal is connected to the positive power supply via the diode, and the other bias terminal is connected to the power supply ground.

11. A method for testing the electrical parameters of a relay, characterized in that, This test method is used to test the release voltage and operating voltage of a relay. The normally closed contact and the changeover contact of the relay under test J are connected to the tester described in any one of claims 1-8. The coil of the relay under test J is then connected to an adjustable test power supply V1. The power supply V1 is adjusted so that its output is zero, and the relay under test J is not energized and is in the released state. The contact state indicator module indicates the state at this time. The power supply V1 is adjusted so that its output gradually increases from zero. During this process, the relay under test J is still not energized and is still in the released state. The contact state indicator module continues to show the current state. When the power supply V1 increases to a certain value, the relay under test J is energized, and the indication state of the contact state indicator module changes. At this time, the value of the power supply V1 is the operating voltage of the relay under test J, which is obtained by the display module. After the relay under test J is activated, the power supply V1 is adjusted so that its output gradually decreases. During this process, the relay under test J is still energized and remains in the energized state. The contact status indicator module continues to display the current state. When V1 decreases to a certain value, the relay under test J is released, and the contact status indicator module indicates the state transition. At this time, the value of the power supply V1 is the release voltage of the relay under test J, which is obtained by the display module.

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