Power module and inverter integration test device

Abstract

The utility model relates to a power module and inverter integrated testing device, which comprises a section bar frame provided with a power module installation station and an inverter installation station; the test unit is installed on the profile frame and comprises a pressure drop test part and a flow test part, the pressure drop test part is configured to form a test loop with the power module installed on the power module installation station or the inverter installed on the inverter installation station, and the flow test part is configured to form a flow test loop with the power module installed on the power module installation station or the inverter installed on the inverter installation station. The flow testing part is configured to be communicated with the power module or the inverter and detect the flow of liquid flowing into the power module or the inverter. Compared with the prior art, the device has the advantages of being convenient to install and maintain, wide in application range and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of voltage drop testing, in particular to a power module and inverter integrated testing device. Background Art

[0002] The inverter is a core component of electric and hybrid vehicles, responsible for current conversion and vehicle control. The power module, a key component within the inverter, is located between the DC bus and the three-phase AC bus. It not only converts DC power into AC power but also regulates, protects, and monitors the power supply. As new energy vehicles develop toward higher power and smaller sizes, the requirements for the precise design of inverter and power module structures are becoming increasingly stringent, especially with regard to flow channel pressure drop simulation. Flow channel pressure drop simulation is crucial for evaluating and optimizing cooling system performance, as it directly impacts the thermal management efficiency of the power module, which in turn determines the reliability and lifespan of the entire power system.

[0003] The voltage drop test method for power modules and inverters primarily simulates the pressure drop caused by the density and viscosity of a specific coolant under preset flow and temperature conditions. However, traditional test equipment and test fixtures are often only capable of measuring a single module. Testing a new module requires replacing numerous components, which is often time-consuming. Furthermore, due to potential errors during equipment replacement and the lack of controlled variables, this method can lead to biased results. Utility Model Content

[0004] The purpose of the present invention is to provide a power module and inverter integrated test device in order to overcome the defects of the above-mentioned prior art. The present invention only requires a few components to complete the voltage drop test of the power module and inverter, and the test results are accurate.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] The utility model provides a power module and inverter integrated testing device and testing method, including:

[0007] Profile rack, with power module installation stations and inverter installation stations;

[0008] And a testing unit installed on the profile frame, which includes a pressure drop testing part and a flow testing part. The pressure drop testing part is configured to form a test loop with the power module installed on the power module installation station or the inverter installed on the inverter installation station, and the flow testing part is configured to: connect to the power module or inverter and detect the liquid flow flowing into the power module or inverter.

[0009] Furthermore, the voltage drop test part includes a differential pressure inverter installed on the profile frame, and the differential pressure inverter has a pressure change test interface that forms a test loop with the power module or inverter. The pressure change test interface is divided into two and is connected to the power module or inverter through a test pipeline to form a test loop.

[0010] Furthermore, the flow testing unit includes a flow meter installed on the profile frame, and the flow meter is configured to test the liquid flow when the liquid flows into the power module or inverter.

[0011] Furthermore, the flow testing part also includes a flow meter base installed on the profile frame and used to install the flow meter, and a three-way valve connected to the flow meter base, and the three-way valve is configured to connect the external water, the flow meter, and the power module or inverter respectively.

[0012] Furthermore, the power module installation station includes a base plate installed on the profile frame, and a first water-passing seat provided on the base plate;

[0013] The bottom plate is provided with two temperature sensor interfaces on both sides of its length direction;

[0014] A power module is installed on the first water seat. Both ends of the first water seat are connected to the pressure drop test part to form a test loop. The bottom of the first water seat is connected to a water inlet pipe and a water outlet pipe passing through the bottom plate. The water inlet pipe is connected to the flow test part.

[0015] Furthermore, first pagoda joints are provided at both ends of the first water-passing seat, and the first pagoda joints are connected to the pressure drop test part.

[0016] Furthermore, two clamping members are distributed at both ends of the upper surface of the first water-passing seat;

[0017] The clamping member includes a quick clamp base installed on the upper surface of the first water flow seat, a quick clamp connected to the quick clamp base, and a pressure head connected to the quick clamp;

[0018] A positioning pin for positioning is also provided between the two clamping members.

[0019] Furthermore, the inverter installation station includes two second water-passing seats installed on the profile frame, and the second water-passing seats have a second pagoda joint connected to the voltage drop test part and two connection ports;

[0020] The second water-passing seat is configured such that when the second pagoda connector is connected to the voltage drop test part, the voltage drop test part, the second water-passing seat, the external inverter, another second water-passing seat, and the voltage drop test part are sequentially connected through the connection port to form the test loop;

[0021] The connection port is communicated with the flow testing portion or the inverter or is used for water discharge.

[0022] Furthermore, the profile frame has an extension frame and a main frame, the power module installation station and the inverter installation station are installed on the main frame, and the test unit is installed on the extension frame.

[0023] The present invention also provides a testing method, which is performed using the above-mentioned testing device, and is characterized in that the method comprises the following steps:

[0024] A coolant is introduced, and the coolant flows through the flow meter base, the water inlet pipe, the first water seat, the power module, the water outlet pipe, or flows through the flow meter base, the second water seat, the inverter, and another second water seat;

[0025] The flow meter tests the flow passing through the flow meter base, and the differential pressure inverter tests the pressure drop change of the test loop.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The utility model is easy to install and maintain, and when a fault occurs, the faulty parts can be replaced in time, which reduces maintenance time and reduces maintenance costs.

[0028] 2. This utility model has a wide range of applications. As a test device for power modules and inverters, its versatility is reflected in its ability to adapt to a variety of product specifications and models. It can be easily adapted and tested by simply replacing the tooling, without having to replace flow meters, pressure gauges, etc. This design greatly improves the flexibility and practicality of the device, meeting diverse testing needs.

[0029] 3. This utility model improves efficiency and accuracy. It enables rapid and accurate comparison of the pressure drop performance of different products, thereby optimizing product design and ensuring that the final product precisely meets the specific design requirements. Through efficient testing processes and precise data collection, the accuracy of simulation results can be significantly improved, resulting in high-quality products. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the structure of the test device for testing the power module in the embodiment of the utility model.

[0031] Figure 2 This is a front view of the clamping member of the testing device in the embodiment of the present utility model.

[0032] Figure 3 This is a top view of the bottom plate of the testing device in an embodiment of the present invention.

[0033] Figure 4 Schematic diagram of the structure of the test device for testing the inverter in the embodiment of the utility model.

[0034] Numbers in the figure:

[0035] 100-profile rack;

[0036] 110 - Power module installation station, 111 - Base plate, 112 - First water supply seat, 113 - Water inlet pipe, 114 - Water outlet pipe, 115 - First pagoda joint, 116 - Temperature sensor interface, 117 - Clamp, 1171 - Quick clamp base, 1172 - Quick clamp, 1173 - Pressure head, 118 - Positioning pin;

[0037] 120-Inverter installation station, 121-Second water supply seat, 122-Second pagoda connector, 123-Connection port

[0038] 130-Extension rack;

[0039] 140-main frame;

[0040] 200-test unit;

[0041] 210-voltage drop test unit, 211-differential pressure inverter, 212-voltage transformer test interface

[0042] 220-Flow test unit, 221-Flow meter, 222-Flow meter base, 223-Three-way valve. DETAILED DESCRIPTION

[0043] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0044] Any features such as component models, material names, connection structures, control methods, etc. that are not clearly stated in this technical solution shall be deemed as common technical features disclosed in the prior art.

[0045] In the description of the present invention, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0046] In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined. Furthermore, the terms "mounted," "connected," and "connected" should be interpreted broadly, encompassing, for example, fixed, removable, or integral connections; bolted or welded; directly or indirectly through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model on a case-by-case basis.

[0047] Traditional voltage drop test equipment can often only test a single power module or a single inverter. If it is necessary to test the power module and inverter at the same time, more components need to be replaced. This method is usually time-consuming and may cause errors during the equipment replacement process. There are no control variables, which will lead to deviations in the results.

[0048] Based on this, Figures 1 to 4 As shown, an embodiment of the present application provides a power module and inverter integrated testing device, including a profile frame 100 and a testing unit 200 installed on the profile frame 100, wherein the profile frame 100 is arranged with a power module installation station 110 and an inverter installation station 120, the power module is installed on the power module installation station 110, and the inverter is installed on the inverter installation station 120, the testing unit 200 includes a voltage drop testing part 210 and a flow testing part 220, the voltage drop testing part 210 is configured to form a test loop with the power module installed on the power module installation station 110 or the inverter installed on the inverter installation station 120, respectively, and the flow testing part 220 is configured to: connect to the power module or inverter and detect the liquid flow flowing into the power module or inverter.

[0049] When testing the power module, it is only necessary to connect the flow test part 220 to the inverter and simultaneously connect the voltage drop test part 210 to the inverter to form a test loop.

[0050] When testing the inverter, it is only necessary to connect the flow rate testing part 220 to the inverter and simultaneously connect the voltage drop testing part 210 to the inverter to form a test loop.

[0051] In some embodiments, see Figure 1 As shown, the pressure drop test part 210 includes a differential pressure inverter 211 installed on the profile frame 100, and the differential pressure inverter 211 has a pressure change test interface 212 that forms a test loop with the power module or inverter. The pressure change test interface 212 is divided into two and is respectively connected to the power module or inverter through a test pipeline to form a test loop. Specifically, the pressure change test interface 212 is respectively connected to the two ends of the power module or the two ends of the inverter. When the coolant passes through the inverter, the pressure is fed back through the pressure change test interface 212 at both ends through the differential pressure inverter 211 to obtain the pressure change.

[0052] In some embodiments, see Figure 1 or Figure 4 As shown, the flow testing unit 220 includes a flow meter 221 installed on the profile frame 100 , and the flow meter 221 is configured to test the liquid flow when the liquid flows into the power module or inverter.

[0053] For more specific implementation, please refer to Figure 1 or Figure 4 As shown, the flow testing unit 220 also includes a flow meter base 222 installed on the profile frame 100, and a three-way valve 223 connected to the flow meter base 222, and the three-way valve 223 is configured to connect the external water, the flow meter 221, and the power module or inverter respectively.

[0054] In the above technical solution, three-way valve 223 has three ports: one connected to the external water inlet pipe, another to flowmeter 221, and yet another to the power module or inverter. This port is connected to the power module when testing the power module, and to the inverter when testing the inverter. Flowmeter 221 is also used to monitor the flow rate of the coolant flowing into the device to determine whether it meets the required flow parameters.

[0055] When testing the power module, in some embodiments, please refer to Figure 1 、 Figure 2 and Figure 3 As shown, the power module installation station 110 includes a bottom plate 111 installed on the profile frame 100 and a first water-passing seat 112 provided on the bottom plate 111;

[0056] The bottom plate 111 is provided with two temperature sensor interfaces 116 on both sides of its length direction;

[0057] A power module is installed on the first water seat 112. Both ends of the first water seat 112 are connected to the pressure drop test part 210 to form a test loop. The bottom of the first water seat 112 is connected to a water inlet pipe 113 and a water outlet pipe 114 passing through the bottom plate 111. The water inlet pipe 113 is connected to the flow test part 220.

[0058] For more specific implementation, please refer to Figure 1 、 Figure 2 and Figure 3 As shown, first pagoda joints 115 are further provided at both ends of the first water-passing seat 112 , and the first pagoda joints 115 are connected to the pressure drop test part 210 .

[0059] In the above technical solution, when the first water seat 112 and the base plate 111 are assembled, it is necessary to reserve a water hole at the bottom of the first water seat 112 and a hole in the base plate 111. The two holes are aligned to ensure that water enters the first water seat 112. During operation, the power module is installed on the first water seat 112, and the water inlet pipe 113 is connected to the flow testing part 220. Specifically, the water inlet pipe 113 is connected to the three-way valve 223. The coolant flows into the water inlet pipe 113 from the three-way valve 223, and then flows into the first water seat 112 from the water inlet pipe 113, and then flows out from the first water seat 112 to the water outlet pipe 114.

[0060] The fixing of the power module is further explained. The power module is installed on the first water-passing seat 112. The first water-passing seat 112 is the power module water-passing group. In some embodiments, two clamping members 117 are distributed at both ends of the upper surface of the first water-passing seat 112.

[0061] The clamping member 117 includes a quick clamp base 1171 mounted on the upper surface of the first water flow seat 112, a quick clamp 1172 connected to the quick clamp base 1171, and a pressure head 1173 connected to the quick clamp 1172;

[0062] A positioning pin 118 is provided between the two clamping members 117 for positioning.

[0063] Specifically, the positioning pin 118 positions the power module and the first water flow seat 112 for assembly, and the clamping member is used to clamp the power module, specifically, the power module is clamped by the pressure head 1173 .

[0064] When testing the inverter, in some implementations, please refer to Figure 4 As shown, the inverter installation station 120 includes two second water-passing seats 121 installed on the profile frame 100 , and the second water-passing seats 121 have a second pagoda joint 122 connected to the voltage drop test part 210 and two connection ports 123;

[0065] The second water-passing seat 121 is configured such that when the second pagoda connector 122 is connected to the voltage drop test unit 210 , the voltage drop test unit 210, the second water-passing seat 121, the external inverter, another second water-passing seat 121, and the voltage drop test unit 210 are sequentially connected through the connection port 123 to form the test loop;

[0066] The connection port 123 is connected to the flow testing unit 220 or the inverter or is used for water discharge.

[0067] In some embodiments, see also Figure 1 As shown, the specific positions of the power module installation station 110 and the inverter installation station 120 are specifically detailed. The profile frame 100 has an extension frame 130 and a main frame 140. The power module installation station 110 and the inverter installation station 120 are installed on the main frame 140, and the test unit 200 is installed on the extension frame 130.

[0068] The present application also provides a testing method, which is performed using the above-mentioned testing device, and the method includes the following steps:

[0069] The coolant is introduced, and the coolant flows through the flow meter base 222, the water inlet pipe 113, the first water seat 112, the power module, the water outlet pipe 114, or flows through the flow meter base 222, the second water seat 121, the inverter, and another second water seat 121;

[0070] The flow meter 221 tests the flow passing through the flow meter base 222 , and the differential pressure inverter 211 tests the pressure drop change of the test loop.

[0071] The above implementation is described in more detail below with reference to specific examples.

[0072] Example

[0073] This embodiment provides a power module and inverter integrated test device. For the specific structure, please refer to Figures 1 to 4As shown, the test unit 200 includes a profile frame 100, on which a power module installation station 110 and an inverter installation station 120 are arranged. The profile frame 100 has an extension frame 130 and a main frame 140. The power module installation station 110 and the inverter installation station 120 are mounted on the main frame 140, and the test unit 200 is mounted on the extension frame 130. The test unit 200 includes a pressure drop test section 210 and a flow rate test section 220. The pressure drop test section 210 is configured to form a test circuit with the power module installed on the power module installation station 110 or the inverter installed on the inverter installation station 120, respectively. The flow rate test section 220 is configured to connect to the power module or inverter and detect the liquid flow rate flowing into the power module or inverter.

[0074] Specifically, the pressure drop test unit 210 includes a differential pressure inverter 211 and a pressure change test interface 212. The differential pressure inverter 211 is installed on the profile frame 100. The pressure change test interface 212 is arranged on the differential pressure inverter 211. The pressure change test interface 212 forms a test loop with the power module or inverter. The pressure change test interface 212 is divided into two and is connected to the power module or inverter through a test pipeline to form a test loop. The flow test unit 220 includes a flow meter 221, a flow meter base 222, and a three-way valve 223. The flow meter 221 is installed on the profile frame 100. The flow meter 221 is configured to test the liquid flow when the liquid flows into the power module or inverter. The flow meter base 222 is installed on the profile frame 100. The three-way valve 223 is connected to the flow meter base 222. The three-way valve 223 is configured to connect the external water, the flow meter 221, and the power module or inverter respectively.

[0075] In addition, the power module installation station 110 includes a base plate 111 and a first water seat 112. The base plate 111 is installed on the profile frame 100. The first water seat 112 is arranged on the base plate 111. The base plate 111 is provided with two temperature sensor interfaces 116 on both sides of its length. The power module is installed on the first water seat 112. The two ends of the first water seat 112 are connected to the pressure drop test part 210 to form a test loop. The bottom of the first water seat 112 is connected to a water inlet pipe 113 and a water outlet pipe 114 that pass through the base plate 111. The water inlet pipe 113 is connected to the flow The first water flow seat 112 is connected to the pressure test part 220, and a first pagoda joint 115 is provided at both ends of the first water flow seat 112. The first pagoda joint 115 is connected to the pressure drop test part 210. Two clamping parts 117 are distributed at both ends of the upper surface of the first water flow seat 112; the clamping part 117 includes a quick clamp base 1171 installed on the upper surface of the first water flow seat 112, a quick clamp 1172 connected to the quick clamp base 1171, and a pressure head 1173 connected to the quick clamp 1172; a positioning pin 118 for positioning is also provided between the two clamping parts 117.

[0076] Specifically, the inverter installation station 120 includes two second water seats 121, which are installed on the profile frame 100. The second water seat 121 has a second pagoda joint 122 connected to the pressure drop test part 210, and two connecting ports 123. The second water seat 121 is configured as follows: when the second pagoda joint 122 is connected to the pressure drop test part 210, the pressure drop test part 210, the second water seat 121, the external inverter, another second water seat 121, and the pressure drop test part 210 are connected in sequence through the connecting port 123 to form a test loop. The connecting port 123 is connected to the flow test part 220 or the inverter or is used for water outlet.

[0077] The working principle of this embodiment is as follows:

[0078] During operation, coolant with a predetermined flow rate and temperature is introduced through the machine water tank. The coolant first flows into the three-way valve 223, and the flow meter 221 detects the flowing coolant to confirm whether it meets the required flow parameters.

[0079] When measuring power module voltage drop, see Figures 1 to 3 , the coolant first flows into the three-way valve 223, then flows into the water inlet pipe 113 at the bottom of the first water seat 121 through the three-way valve 223, then flows through the power module clamped by the clamping assembly, and finally is discharged from the water outlet pipe 114 at the bottom of the first water seat 121, and re-enters the circulation system of the machine water tank equipment. In this process, the pressure difference generated when the coolant passes through the power module is transmitted to the differential pressure transmitter 211 through the first pagoda connector 122 located at both ends of the first water seat 121. The numerical value displayed on the differential pressure transmitter 211 reflects the specific data of the pressure difference. At the same time, the temperature sensor is connected to the temperature sensor interface 116, and the displayed numerical value represents the temperature of the coolant when it enters and leaves the power module.

[0080] When measuring the inverter voltage drop, refer to Figure 2 The coolant first flows into the three-way valve 223, then flows through the three-way valve 223 into the connection port 123 of one of the second water-passing seats 121, and then flows from the other connection port 123 of the second water-passing seat 121 into the water inlet of the inverter to be tested. After flowing through the inverter water channel, it flows from the inverter water channel outlet into the connection port 123 of another second water-passing seat 121, and finally flows out of the second water-passing seat 121 and re-enters the circulation system of the machine water tank equipment. During the test, when the coolant flows through the second water-passing seat 121, the second pagoda connector 122 located at the second water-passing seat 121 transmits pressure to the differential pressure transmitter 211, reflecting the pressure drop of the inverter to be tested during the measurement process.

[0081] Example 2

[0082] This embodiment provides a testing method, which is performed using the testing device in Example 1. The method includes the following steps:

[0083] The coolant is introduced, and the coolant flows through the flow meter base 222, the water inlet pipe 113, the first water seat 112, the power module, the water outlet pipe 114, or flows through the flow meter base 222, the second water seat 121, the inverter, and another second water seat 121;

[0084] The flow meter 221 tests the flow through the flow meter base 222 , and the differential pressure inverter 211 tests the pressure drop change of the test loop.

[0085] The above description of the embodiments is intended to facilitate understanding and use of the utility model by those skilled in the art. Those skilled in the art will readily be able to make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the utility model is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of this utility model without departing from the scope of this utility model should be within the scope of protection of this utility model.

Claims

1. A power module and inverter integrated test device, characterized in that: include: A profile frame (100) is provided with a power module installation station (110) and an inverter installation station (120); and a test unit (200) mounted on the profile frame (100), comprising a pressure drop test section (210) and a flow test section (220), wherein the pressure drop test section (210) is configured to form a test loop with a power module mounted on the power module mounting station (110) or an inverter mounted on the inverter mounting station (120), and the flow test section (220) is configured to connect to the power module or the inverter and detect the flow of liquid flowing into the power module or the inverter.

2. A power module and inverter integrated test device according to claim 1, characterized in that: The voltage drop test section (210) comprises a differential pressure inverter (211) mounted on the profile frame (100), wherein the differential pressure inverter (211) has a pressure change test interface (212) that forms a test loop with the power module or the inverter.

3. A power module and inverter integrated testing device according to claim 2, characterized in that: The pressure change test interface (212) is divided into two and is respectively connected to the power module or the inverter through a test pipeline to form a test loop.

4. A power module and inverter integrated testing device according to claim 1, characterized in that: The flow testing section (220) comprises a flow meter (221) mounted on the profile frame (100), and the flow meter (221) is configured to test the liquid flow when the liquid flows into the power module or the inverter.

5. A power module and inverter integrated testing device according to claim 4, characterized in that: The flow testing section (220) further comprises a flow meter base (222) mounted on the profile frame (100) and used for mounting the flow meter (221), and a three-way valve (223) connected to the flow meter base (222), wherein the three-way valve (223) is configured to respectively connect external water inlet, the flow meter (221), and the power module or inverter.

6. A power module and inverter integrated testing device according to claim 1, characterized in that: The power module installation station (110) comprises a base plate (111) installed on the profile frame (100), and a first water flow seat (112) provided on the base plate (111); The bottom plate (111) is provided with two temperature sensor interfaces (116) on both sides in the length direction thereof; A power module is installed on the first water-passing seat (112); both ends of the first water-passing seat (112) are connected to the pressure drop test portion (210) to form a test loop; the bottom of the first water-passing seat (112) is connected to a water inlet pipe (113) and a water outlet pipe (114) passing through the bottom plate (111); the water inlet pipe (113) is connected to the flow test portion (220).

7. A power module and inverter integrated test device according to claim 6, characterized in that: First pagoda joints (115) are also provided at both ends of the first water-passing seat (112), and the first pagoda joints (115) are connected to the pressure drop test portion (210).

8. The power module and inverter integrated test device according to claim 6, characterized in that: Two clamping members (117) are distributed at both ends of the upper surface of the first water-passing seat (112); The clamping member (117) comprises a quick clamp base (1171) mounted on the upper surface of the first water flow seat (112), a quick clamp (1172) connected to the quick clamp base (1171), and a pressure head (1173) connected to the quick clamp (1172); A positioning pin (118) for positioning is also provided between the two clamping members (117).

9. The power module and inverter integrated test device according to claim 1, characterized in that: The inverter installation station (120) comprises two second water-passing seats (121) mounted on the profile frame (100), wherein the second water-passing seats (121) are provided with a second pagoda joint (122) connected to the voltage drop test portion (210), and two connection ports (123); The second water-passing seat (121) is configured such that when the second pagoda connector (122) is connected to the voltage drop test part (210), the voltage drop test part (210), the second water-passing seat (121), the external inverter, another second water-passing seat (121), and the voltage drop test part (210) are sequentially connected through the connection port (123) to form the test loop; The connection port (123) is in communication with the flow testing portion (220) or the inverter or is used for water discharge.

10. The power module and inverter integrated test device according to claim 1, characterized in that: The profile frame (100) comprises an extension frame (130) and a main frame (140); the power module installation station (110) and the inverter installation station (120) are installed on the main frame (140); and the test unit (200) is installed on the extension frame (130).

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