Power analyzer wiring device realized based on alternating current contactor line switching

Abstract

The utility model provides a power analyzer wiring device based on alternating current contactor line switching. The power analyzer wiring device comprises an input wiring switch; an output wiring switch; the at least four groups of alternating current contactors are respectively connected with the input wiring switch and the output wiring switch; when the input wiring switch is switched on, the first group of alternating current contactors is connected with a measuring end of a single-phase product, or the second group of alternating current contactors is connected with a measuring end of a three-phase product, or the third group of alternating current contactors is connected with a measuring end of a three-phase four-wire product; or when the output wiring switch is switched on, the fourth group of alternating current contactors are connected with the output measuring end of the product. According to the invention, the test wire harness can be preset in advance, and when a project is replaced, platform construction can be completed only by connecting a small number of wire harnesses, so that the platform preparation time is shortened, and the test efficiency is improved.

Description

Technical Field

[0001] This application belongs to the technical field of equipment testing, and relates to an analyzer wiring device, particularly a power analyzer wiring device based on AC contactor line switching. Background Technology

[0002] During the development and design of frequency converters, it is necessary to test whether parameters such as harmonic current, power factor, and efficiency meet the requirements, which requires the use of a power analyzer. For testing single-phase or three-phase frequency converters, the input wiring method needs to be adjusted accordingly. This wiring operation significantly extends the platform setup time and reduces testing efficiency.

[0003] For single-phase products, select the 1P2W power analyzer connection method; for three-phase products (without neutral wire), select the 3P3W (3V3A) connection method; and for three-phase products (with neutral wire), select the 3P4W connection method.

[0004] When using a power analyzer to measure high voltage or high current, the power capacity of the device under test will be very large. Incorrect wiring can lead to overvoltage or overcurrent in the circuit under test. This can damage the testing equipment and the device under test, and may also cause electric shock or fire. However, many power analyzers have built-in overcurrent and overvoltage protection, relying mainly on manual wiring checks, which carries the risk of equipment damage and safety hazards.

[0005] Therefore, the existing technology has the following problems: (1) Power analyzers have multiple wiring methods, and the wiring is complicated, resulting in low platform construction efficiency. (2) Power analyzers do not have overcurrent and overvoltage protection, and manual wiring errors may cause equipment damage, and in severe cases, there is a risk of electric shock and fire. Summary of the Invention

[0006] This application provides a wiring device for a power analyzer based on AC contactor line switching, which solves the problem of complex wiring for power analyzers.

[0007] In a first aspect, this application provides a wiring device for a power analyzer based on AC contactor line switching. The device includes: an input wiring switch; an output wiring switch; and at least four sets of AC contactors, respectively connected to the input wiring switch and the output wiring switch. When the input wiring switch is turned on, the first set of AC contactors is connected to the measuring terminal of a single-phase product, or the second set of AC contactors is connected to the measuring terminal of a three-phase product, or the third set of AC contactors is connected to the measuring terminal of a three-phase four-wire product; or when the output wiring switch is turned on, the fourth set of AC contactors is connected to the output measuring terminal of the product.

[0008] In one implementation of the first aspect, the input wiring switch includes a first switch, a second switch, and a third switch; the first switch corresponds to the on / off state of a 1P2W wiring method, the second switch corresponds to the on / off state of a 3P3W wiring method, and the third switch corresponds to the on / off state of a 3P4W wiring method; the output wiring switch includes a fourth switch; the fourth switch corresponds to the on / off state of a 3P3W wiring method.

[0009] In one implementation of the first aspect, the first switch, the second switch, the third switch, and the fourth switch are all push-button switches.

[0010] In one implementation of the first aspect, when the first switch is pressed, the first group of AC contactors is connected to the measuring terminal of the single-phase product in a 1P2W wiring configuration; when the second switch is pressed, the second group of AC contactors is connected to the measuring terminal of the three-phase product in a 3P3W wiring configuration; when the third switch is pressed, the third group of AC contactors is connected to the measuring terminal of the single-phase product in a 3P4W wiring configuration; and when the fourth switch is pressed, the fourth group of AC contactors is connected to the output measuring terminal of the product in a 3P3W wiring configuration.

[0011] In one implementation of the first aspect, the input wiring switch is a three-position rotary switch, including a first position, a second position, and a third position; the first position corresponds to the on / off state of the 1P2W wiring method, the second position corresponds to the on / off state of the 3P3W wiring method, and the third position corresponds to the on / off state of the 3P4W wiring method.

[0012] In one implementation of the first aspect, the AC contactor includes a 4-position AC contactor, wherein the auxiliary contacts of the AC contactor are normally open and selected, and all circuits are in an open state before all AC contactors are engaged.

[0013] In one implementation of the first aspect, the first group of AC contactors includes one AC contactor; the second group of AC contactors includes three AC contactors; the third group of AC contactors includes three AC contactors; and the fourth group of AC contactors includes three AC contactors.

[0014] In one implementation of the first aspect, the measuring terminals of the single-phase product include those for household air conditioners, household refrigerators, and televisions; the measuring terminals of the three-phase product include those for commercial air conditioners, commercial refrigerators, and elevators; the measuring terminals of the three-phase four-wire product include those for industrial equipment and distribution cabinets; and the output measuring terminals of the product include those for voltage, current, and power measurement of motors, electric motors, and compressors.

[0015] In one implementation of the first aspect, the device further includes three sets of input measurement terminals and one set of output measurement terminals; the first set of AC contactors is connected to a single-phase product through the first set of input measurement terminals, the second set of AC contactors is connected to a three-phase product through the second set of input measurement terminals, the third set of AC contactors is connected to a three-phase four-wire product through the third set of input measurement terminals, and the fourth set of AC contactors is connected to the output measurement terminal of the product through the output measurement terminal.

[0016] In one implementation of the first aspect, the first group of input measurement terminals includes an input L quick-connect terminal, an input N quick-connect terminal, and an output L quick-connect terminal and an output N quick-connect terminal; the second group of input measurement terminals includes an input R quick-connect terminal, an input S quick-connect terminal, an input T quick-connect terminal, and an output R quick-connect terminal, an output S quick-connect terminal, and an output T quick-connect terminal; the third group of input measurement terminals includes an input R quick-connect terminal, an input S quick-connect terminal, an input T quick-connect terminal, an input N quick-connect terminal, and an output R quick-connect terminal, an output S quick-connect terminal, an output T quick-connect terminal, and an output N quick-connect terminal; the output measurement terminals include an input R quick-connect terminal, an input S quick-connect terminal, an input T quick-connect terminal, and an output R quick-connect terminal, an output S quick-connect terminal, and an output T quick-connect terminal.

[0017] As described above, the power analyzer wiring device based on AC contactor line switching described in this application has the following beneficial effects:

[0018] This application allows for pre-setting of test wiring harnesses. When changing projects, only a small number of wiring harnesses need to be connected to complete the platform setup, reducing platform preparation time and improving testing efficiency. It avoids the problems of existing power analyzer solutions, which involve multiple wiring methods, complex wiring, and low platform setup efficiency. It also avoids the issues of power analyzers lacking overcurrent and overvoltage protection, which could lead to equipment damage due to manual wiring errors, and in severe cases, risks of electric shock and fire. Attached Figure Description

[0019] Figure 1 The diagram shown is a structural connection diagram of the wiring device for the power analyzer described in an embodiment of this application.

[0020] Figure 2 The diagram shown is a circuit structure diagram of the wiring device for the power analyzer described in an embodiment of this application.

[0021] Figure 3 The diagram shown is a wiring diagram of the input terminal 1P2W working mode of the power analyzer wiring device described in this application embodiment.

[0022] Figure 4 The diagram shown is a wiring diagram of the input terminal 3P3W working mode of the power analyzer wiring device described in this application embodiment.

[0023] Figure 5 The diagram shown is a wiring diagram of the input terminal 3P4W working mode of the power analyzer wiring device described in this application embodiment.

[0024] Figure 6 The diagram shown is a wiring diagram of the output terminal 3P3W working mode of the power analyzer wiring device described in the embodiments of this application.

[0025] Component designation explanation

[0026] 1. Power analyzer wiring device

[0027] 11 Input Wiring Switch

[0028] 12 Output Wiring Switch

[0029] 13 AC contactor Detailed Implementation

[0030] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0031] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. Therefore, the illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0032] The technical solutions in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0033] Please see Figure 1 The diagram shows the structural connection of the wiring device for the power analyzer described in an embodiment of this application. Figure 1 As shown, this embodiment provides a power analyzer wiring device 1 based on AC contactor line switching, specifically including:

[0034] Input wiring switch 11;

[0035] Output wiring switch 12;

[0036] At least four sets of AC contactors 13 are connected to the input wiring switch 11 and the output wiring switch 12, respectively.

[0037] When the input wiring switch 11 is turned on, the first set of AC contactors is connected to the measuring terminal of a single-phase product, or the second set of AC contactors is connected to the measuring terminal of a three-phase product, or the third set of AC contactors is connected to the measuring terminal of a three-phase four-wire product; or

[0038] When the output wiring switch 12 is turned on, the fourth set of AC contactors is connected to the output measurement terminal of the product.

[0039] Please see Figure 2 The diagram shows the circuit structure of the wiring device for the power analyzer described in an embodiment of this application. Figure 2 As shown, the input wiring switch includes a first switch, a second switch, and a third switch; the first switch corresponds to the on / off state of the 1P2W wiring method, the second switch corresponds to the on / off state of the 3P3W wiring method, and the third switch corresponds to the on / off state of the 3P4W wiring method.

[0040] like Figure 2 As shown, the output wiring switch includes a fourth switch; the fourth switch corresponds to the on / off state of the 3P3W wiring method.

[0041] In one embodiment, the first switch, the second switch, the third switch, and the fourth switch are all push-button switches.

[0042] Specifically, the first switch is a push-button switch; when pressed, it connects the power supply to the first group of AC contactors, enabling the first group of AC contactors to connect to the measuring terminal of the single-phase product. The second switch is a push-button switch; when pressed, it connects the power supply to the second group of AC contactors, enabling the second group of AC contactors to connect to the measuring terminal of the three-phase product. The third switch is a push-button switch; when pressed, it connects the power supply to the third group of AC contactors, enabling the third group of AC contactors to connect to the measuring terminal of the three-phase four-wire product. The fourth switch is a push-button switch; when pressed, it connects the power supply to the fourth group of AC contactors, enabling the fourth group of AC contactors to connect to the output measuring terminal of the product.

[0043] In one embodiment, the correspondence between each switch when pressed and different wiring methods is as follows:

[0044] When the first switch is pressed, the first set of AC contactors is connected to the measuring terminal of the single-phase product in a 1P2W wiring configuration to conduct electricity.

[0045] When the second switch is pressed, the second set of AC contactors is connected to the measuring terminals of the three-phase product in a 3P3W wiring configuration to conduct electricity.

[0046] When the third switch is pressed, the third set of AC contactors is connected to the measuring terminal of the single-phase product in a 3P4W wiring configuration to conduct electricity.

[0047] When the fourth switch is pressed, the fourth set of AC contactors is connected to the output measurement terminal of the product in a 3P3W wiring configuration to conduct electricity.

[0048] In one embodiment, the input wiring switch can be either a stand-alone push-button switch or a three-position rotary switch.

[0049] In practical applications, the three-position rotary switch includes a first position, a second position, and a third position.

[0050] The first position corresponds to the on / off state of the 1P2W wiring method, the second position corresponds to the on / off state of the 3P3W wiring method, and the third position corresponds to the on / off state of the 3P4W wiring method.

[0051] Therefore, the input wiring switch adopts a 3-position rotary switch, which can prevent two different input wiring modes from working at the same time, and plays a certain role in preventing mistaken identity.

[0052] In one embodiment, the AC contactor includes a 4-position AC contactor, wherein the auxiliary contacts of the AC contactor are normally open and in a selected state, and all circuits are in an open state before all AC contactors are engaged.

[0053] In one embodiment, the first group of AC contactors includes one AC contactor; the second group of AC contactors includes three AC contactors; the third group of AC contactors includes three AC contactors; and the fourth group of AC contactors includes three AC contactors.

[0054] In one embodiment, the measurement results for different categories of products are as follows:

[0055] The measuring terminals of the single-phase products include those of household air conditioners, household refrigerators, and televisions.

[0056] The measuring terminals of the three-phase products include those for commercial air conditioners, commercial refrigerators, and elevators;

[0057] The measuring terminals of the three-phase four-wire product include those for industrial equipment and distribution cabinets;

[0058] The product's output measurement terminals include voltage, current, and power measurement terminals for motors, electric motors, and compressors.

[0059] In one embodiment, the device further includes three sets of input measurement terminals and one set of output measurement terminals.

[0060] The first group of AC contactors is connected to the single-phase product through the first group of input measurement terminals; the second group of AC contactors is connected to the three-phase product through the second group of input measurement terminals; the third group of AC contactors is connected to the three-phase four-wire product through the third group of input measurement terminals; and the fourth group of AC contactors is connected to the output measurement terminal of the product through the output measurement terminals.

[0061] In one embodiment, the various measuring terminals specifically include the following categories:

[0062] The first set of input measurement terminals includes an input L quick-connect terminal, an input N quick-connect terminal, an output L quick-connect terminal, and an output N quick-connect terminal;

[0063] The second set of input measurement terminals includes an input R quick-connect terminal, an input S quick-connect terminal, an input T quick-connect terminal, and an output R quick-connect terminal, an output S quick-connect terminal, and an output T quick-connect terminal;

[0064] The third set of input measurement terminals includes input R quick-connect terminal, input S quick-connect terminal, input T quick-connect terminal, input N quick-connect terminal, and output R quick-connect terminal, output S quick-connect terminal, output T quick-connect terminal, and output N quick-connect terminal;

[0065] The output measurement terminals include an input R quick-connect terminal, an input S quick-connect terminal, an input T quick-connect terminal, and an output R quick-connect terminal, an output S quick-connect terminal, and an output T quick-connect terminal.

[0066] Please see Figure 3 The diagram shows the wiring diagram of the input terminal 1P2W working mode of the power analyzer wiring device described in this application embodiment. Figure 3 As shown, the bolded line represents the 1P2W operating mode circuit. The first switch is a push-button switch. When pressed, the first switch connects the power supply to the first group of AC contactors (the first group of AC contactors includes the first one from the left among the 10 middle AC contactors). The first group of AC contactors changes from an unengaged state to an engaged state, and the contacts change from a normally open state to a normally closed state. The upper end of the first group of AC contactors is connected to the leftmost channel of the power analyzer, and the lower end of the first group of AC contactors is connected to the input L and N quick-connect terminals and the output L and N quick-connect terminals of the single-phase product.

[0067] Combination Figure 3As shown, in another embodiment, the first switch is a rotary switch. The rotary switch is turned to the first position corresponding to the 1P2W wiring method. The first position connects the power supply of the first group of AC contactors (the first group of AC contactors includes the first one from the left among the 10 middle AC contactors). The first group of AC contactors changes from an unengaged state to an engaged state, and the contacts change from a normally open state to a normally closed state. The upper end of the first group of AC contactors is connected to the leftmost channel of the power analyzer, and the lower end of the first group of AC contactors is connected to the input L and N quick-connect terminals and the output L and N quick-connect terminals of the single-phase product.

[0068] In practical applications, the measuring terminals of the single-phase product include those of household air conditioners, household refrigerators, and televisions.

[0069] Please see Figure 4 The diagram shows the wiring diagram of the input terminal 3P3W working mode of the power analyzer wiring device described in the embodiments of this application. Figure 4 As shown, the bolded line represents the 3P3W (or 3V3A) operating mode circuit. The second switch is a push-button switch. When pressed, the second switch connects the power supply to the second group of AC contactors (the second group of AC contactors includes the 2nd, 3rd, and 4th from the left of the middle 10 AC contactors). The second group of AC contactors changes from an unengaged state to an engaged state, and the contacts change from a normally open state to a normally closed state. The upper end of the second group of AC contactors is connected to the 2nd and 3rd channels from the left of the power analyzer, and the lower end of the second group of AC contactors is connected to the input R, S, T quick-connect terminals and the output R, S, T quick-connect terminals of the three-phase product.

[0070] Combination Figure 4 As shown, in another embodiment, the second switch is a rotary switch. The rotary switch is turned to the second position corresponding to the 3P3W wiring method. The second position connects the power supply of the second group of AC contactors (the second group of AC contactors includes the 2nd, 3rd, and 4th from the left of the middle 10 AC contactors). The second group of AC contactors changes from an unengaged state to an engaged state, and the contacts change from a normally open state to a normally closed state. The upper end of the second group of AC contactors is connected to the 2nd and 3rd channels from the left of the power analyzer, and the lower end of the second group of AC contactors is connected to the input R, S, T quick-connect terminals and the output R, S, T quick-connect terminals of the three-phase product.

[0071] In practical applications, the measuring terminals of the three-phase products include those for commercial air conditioners, commercial refrigerators, and elevators.

[0072] Please see Figure 5 The diagram shows the wiring diagram of the input terminal 3P4W working mode of the power analyzer wiring device described in this application embodiment. Figure 5As shown, the bolded line represents the 3P4W operating mode circuit. The third switch is a push-button switch. When pressed, the third switch connects the power supply to the third group of AC contactors (the third group of AC contactors includes the 5th, 6th, and 7th from the left of the middle 10 AC contactors). The third group of AC contactors changes from an unengaged state to an engaged state, and the contacts change from a normally open state to a normally closed state. The upper end of the third group of AC contactors is connected to the 1st, 2nd, and 3rd channels from the left of the power analyzer, and the lower end of the third group of AC contactors is connected to the input R, S, T, N quick-connect terminals and the output R, S, T, N quick-connect terminals of the three-phase four-wire product.

[0073] Combination Figure 5 As shown, in another embodiment, the third switch is a rotary switch. The rotary switch is turned to the first position corresponding to the 3P4W wiring method. The third position connects the power supply of the third group of AC contactors (the third group of AC contactors includes the 5th, 6th, and 7th from the left of the middle 10 AC contactors). The third group of AC contactors changes from an unengaged state to an engaged state, and the contacts change from a normally open state to a normally closed state. The upper end of the third group of AC contactors is connected to the 1st, 2nd, and 3rd channels from the left of the power analyzer. The lower end of the third group of AC contactors is connected to the input R, S, T, N quick-connect terminals and the output R, S, T, N quick-connect terminals of the three-phase four-wire product.

[0074] In practical applications, the measuring terminals of the three-phase four-wire product include those of industrial equipment and power distribution cabinets.

[0075] Please see Figure 6 The diagram shows the wiring diagram of the output terminal of the power analyzer wiring device described in this application embodiment, in 3P3W operating mode. Figure 6 As shown, the bolded line represents the 3P3W (or 3V3A) operating mode circuit. The fourth switch is a push-button switch. When pressed, the fourth switch connects the power supply to the fourth group of AC contactors (the fourth group of AC contactors includes the 8th, 9th, and 10th contactors from the left out of the middle 10 AC contactors). The fourth group of AC contactors changes from an unengaged state to an engaged state, and the contacts change from a normally open state to a normally closed state. The upper end of the fourth group of AC contactors is connected to the 4th, 5th, and 6th channels from the left out of the power analyzer, and the lower end of the fourth group of AC contactors is connected to the input R, S, T quick-connect terminals and the output R, S, T quick-connect terminals on the product output side.

[0076] In practical applications, the output measurement terminals of the product include voltage, current, and power measurement terminals for motors, electric motors, and compressors.

[0077] In the several embodiments provided in this application, it should be understood that the disclosed apparatus can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of modules / units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or units may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection of the apparatus or module or unit may be electrical, mechanical, or other forms.

[0078] The modules / units described as separate components may or may not be physically separate. The components shown as modules / units may or may not be physical modules; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules / units can be selected to achieve the objectives of the embodiments of this application, depending on actual needs. For example, the functional modules / units in the various embodiments of this application may be integrated into one processing module, or each module / unit may exist physically separately, or two or more modules / units may be integrated into one module / unit.

[0079] The descriptions of the processes or structures corresponding to the above figures each have their own emphasis. For parts of a process or structure that are not described in detail, please refer to the relevant descriptions of other processes or structures.

[0080] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. A wiring device for a power analyzer based on AC contactor line switching, characterized in that, The device includes: Input wiring switch; Output wiring switch; At least four sets of AC contactors are respectively connected to the input wiring switch and the output wiring switch; When the input wiring switch is turned on, the first set of AC contactors is connected to the measuring terminal of a single-phase product, or the second set of AC contactors is connected to the measuring terminal of a three-phase product, or the third set of AC contactors is connected to the measuring terminal of a three-phase four-wire product; or When the output wiring switch is turned on, the fourth set of AC contactors is connected to the output measurement terminal of the product.

2. The apparatus according to claim 1, characterized in that: The input wiring switch includes a first switch, a second switch, and a third switch; the first switch corresponds to the on / off state of the 1P2W wiring method, the second switch corresponds to the on / off state of the 3P3W wiring method, and the third switch corresponds to the on / off state of the 3P4W wiring method. The output wiring switch includes a fourth switch; the fourth switch corresponds to the on / off state of the 3P3W wiring method.

3. The apparatus according to claim 2, characterized in that: The first switch, the second switch, the third switch, and the fourth switch are all push-button switches.

4. The apparatus according to claim 3, characterized in that: When the first switch is pressed, the first set of AC contactors is connected to the measuring terminal of the single-phase product in a 1P2W wiring configuration to conduct electricity. When the second switch is pressed, the second set of AC contactors is connected to the measuring terminals of the three-phase product in a 3P3W wiring configuration to conduct electricity. When the third switch is pressed, the third set of AC contactors is connected to the measuring terminal of the single-phase product in a 3P4W wiring configuration to conduct electricity. When the fourth switch is pressed, the fourth set of AC contactors is connected to the output measurement terminal of the product in a 3P3W wiring configuration to conduct electricity.

5. The apparatus according to claim 1, characterized in that: The input wiring switch is a 3-position rotary switch, including a first position, a second position, and a third position; The first position corresponds to the on / off state of the 1P2W wiring method, the second position corresponds to the on / off state of the 3P3W wiring method, and the third position corresponds to the on / off state of the 3P4W wiring method.

6. The apparatus according to claim 1, characterized in that: The AC contactor includes a 4-position AC contactor. The auxiliary contacts of the AC contactor are normally open. Before all AC contactors are engaged, all circuits are in the open state.

7. The apparatus according to claim 6, characterized in that: The first group of AC contactors includes one AC contactor; the second group of AC contactors includes three AC contactors; the third group of AC contactors includes three AC contactors; and the fourth group of AC contactors includes three AC contactors.

8. The apparatus according to claim 1, characterized in that: The measuring terminals of the single-phase products include those of household air conditioners, household refrigerators, and televisions. The measuring terminals of the three-phase products include those for commercial air conditioners, commercial refrigerators, and elevators; The measuring terminals of the three-phase four-wire product include those for industrial equipment and distribution cabinets; The product's output measurement terminals include voltage, current, and power measurement terminals for motors, electric motors, and compressors.

9. The apparatus according to claim 1, characterized in that, The device also includes three sets of input measurement terminals and one set of output measurement terminals; The first group of AC contactors is connected to the single-phase product through the first group of input measurement terminals; the second group of AC contactors is connected to the three-phase product through the second group of input measurement terminals; the third group of AC contactors is connected to the three-phase four-wire product through the third group of input measurement terminals; and the fourth group of AC contactors is connected to the output measurement terminal of the product through the output measurement terminals.

10. The apparatus according to claim 9, characterized in that: The first set of input measurement terminals includes an input L quick-connect terminal, an input N quick-connect terminal, an output L quick-connect terminal, and an output N quick-connect terminal; The second set of input measurement terminals includes an input R quick-connect terminal, an input S quick-connect terminal, an input T quick-connect terminal, and an output R quick-connect terminal, an output S quick-connect terminal, and an output T quick-connect terminal; The third set of input measurement terminals includes input R quick-connect terminal, input S quick-connect terminal, input T quick-connect terminal, input N quick-connect terminal, and output R quick-connect terminal, output S quick-connect terminal, output T quick-connect terminal, and output N quick-connect terminal; The output measurement terminals include an input R quick-connect terminal, an input S quick-connect terminal, an input T quick-connect terminal, and an output R quick-connect terminal, an output S quick-connect terminal, and an output T quick-connect terminal.

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