Preparation method of multi-channel testing device

Abstract

The invention provides a preparation method of a multi-channel testing device, which comprises the following steps of: determining the on-load requirement of a product to be tested in a test, determining the type and the number of input interfaces required on an input panel of an adapter box, and matching a product output signal; selecting an adaptive output cable conductor type and an interface; the number and layout of input interfaces on the transfer box are planned, relays or mechanical switches are selected as product switching modes, arrangement and wiring of the mechanical switches in the transfer box are designed, distribution, frames and sizes of input and output panel interfaces of the transfer box are determined according to the internal wiring, the switch arrangement and the output interfaces, and a machining drawing is drawn according to the distribution, the frames and the sizes. And the production of the switching box is realized. The input capability of an expensive LCR tester is effectively expanded through the switching box, the test requirements of a large number of sensors are met, the test efficiency and accuracy are improved, the operation difficulty and the misoperation risk are reduced, complex wiring is simplified into switching operation, and the test process is greatly optimized.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic manufacturing, and more specifically, to a preparation method for a multi-channel test device. Background Art

[0002] Currently, the testing of a certain type of sensor in the existing transportation field during the test process is usually single testing. With the booming development of China's aerospace industry, the order volume in the field of spacecraft production and manufacturing has also increased significantly, which is manifested as mass production in batches in production. In this context, improving the testing efficiency and accuracy during the test process is of great significance for improving production and manufacturing efficiency and reducing enterprise costs.

[0003] In the patent document with the publication number CN215641501U, a multi-channel transfer device for high-resistance testing is disclosed. The multi-channel transfer device is used to connect a resistance measuring device and a sample to be tested. The multi-channel transfer device includes a box body. Coaxial plugs and interfaces are respectively arranged on both side walls of the box body. The coaxial plugs and the interfaces are connected through wires in the box body. The coaxial plugs are externally connected to the sample to be tested, and the interfaces are externally connected to the resistance measuring device. Currently, it is necessary to adapt to the times, and the corresponding testing method for the mass production of products in the current transportation field also needs to be changed to meet the needs of the rapid development of the aerospace industry. In the past, when testing a single sensor, it was necessary to frequently switch products during the test process and at the same time perform operations such as wiring, disconnecting, and connecting the shielding layer on multiple lead-out wires of the sensor. In the actual operation process, it is very cumbersome to operate on a large number of sensors. Therefore, it is necessary to design and invent a device that can reduce the wiring operation of the sensor. Summary of the Invention

[0004] Aiming at the defects in the prior art, the purpose of the present invention is to provide a multi-channel testing method applied to the test process.

[0005] According to a preparation method for a multi-channel test device provided by the present invention, the method includes the following steps: Step S1: Determine the load quantity a of the product to be tested during the test process; Step S2: According to the output signal type and quantity of the product to be tested, determine the input interface type and quantity corresponding to the product to be tested on the input panel of the test transfer box; Step S3: According to the output port, output signal type, and output channel number of the product to be tested, determine the type of wire used for the matching output cable and the interface types corresponding to the output end of the product to be tested and the input end of the test transfer box; Step S4: Based on the loaded quantity a of the product under test determined in Step S1, the input interfaces on the input panel of the test adapter box, the wire types of the output cables, and the interface types matching the product under test and the input end of the test adapter box, determine the quantity and layout of the corresponding input interfaces on the test adapter box; Step S5: Based on the input interface types and quantities determined in Step S4, determine the method for switching different products under test of the same type during the test of the product under test; Step S6: Based on the mechanical switch determined in Step S5 as the action input for switching the product under test and the quantity and layout of the input interfaces determined in Step S4, determine the layout of the mechanical switch of the test adapter box, and at the same time determine the internal wiring method of the test adapter box connecting the mechanical switch box and the input end interface of the sensor; Step S7: Based on the internal wiring method, mechanical switch layout, output interfaces on the output panel of the test adapter box, and the input port of the LCR tester determined in Step S6, determine the input panel, output panel of the entire test adapter box and the corresponding interface distribution thereon, and determine the frame and size of the entire test adapter box; Step S8: Draw the corresponding machining drawings according to the test adapter box frame, size, port distribution and wiring method on the input panel and output panel determined in Step S7, and produce the test adapter box.

[0006] Preferably, in Step S1, the method for determining the loaded quantity a of the product under test during the test process is: The total number of sensors Y and the effective production time T in the order task, the time t required for a single test process, the number of test times x = T / t, and the loaded quantity a of the product under test in the test = Y / x = Y·t / T.

[0007] Preferably, in Step S2, the specific method for determining the input interface types and quantities corresponding to the product under test on the input panel of the test adapter box according to the output signal types and quantities of the product under test is: Determine the number of wires b for a single sensor connected to the input panel of the test adapter box. Combining with the loaded quantity a of the product under test during the test process determined in Step S1 = Y / x = Y·t / T, determine that the number of interfaces on the input panel of the test adapter box is Z = a·b = b·Y·t / T; The interface type is determined as a BNC socket for docking with a radio frequency cable according to the output capacitance signal of the sensor, and determine the quantity and distribution of the BNC sockets on the input panel.

[0008] Preferably, in step S3, according to whether the end of the sensor lead-out wire is stripped and scattered or crimped with a coaxial contact, confirm the specifications of the BNC plug of the transfer cable connecting the sensor to the test adapter box and the coaxial jack or alligator clip for connecting the sensor. At the same time, according to the load quantity a = Y / x = Y·t / T of the product to be tested during the test process, confirm the number of transfer cables required.

[0009] Preferably, in step S4, according to the load quantity a of the product to be tested determined in step S1, step S2, and step S3, the input interface on the input panel of the test adapter box, the corresponding wire types of the output cables, and the interface types for matching the product to be tested and the input end of the test adapter box, the specific method for determining the number and position arrangement of the corresponding input interfaces on the test adapter box is as follows: According to the selected BNC socket, confirm the size of the holes opened on the input panel of the test adapter box and the distance between the holes.

[0010] Preferably, in step S5, according to the input interface types and quantities on the test adapter box determined in step S4, the specific method for determining the method of switching different products to be tested of the same type during the test of the product to be tested is as follows: If the input response of the product to be tested is an instantaneous response, use a mechanical toggle switch. If it is an automatically switched sensor, use a relay. According to the response time of the product to be tested from input to output to the LCR tester, determine the on-off time of the relay.

[0011] Preferably, in step S6 and step S7, according to the factors determined in step S1 to step S5, determine the internal wiring method of the test adapter box and the distribution of the mechanical toggle switches on the upper panel.

[0012] Preferably, in step S8, according to the hole position distributions of the input panel, upper panel, and output panel determined in the previous steps, draw the corresponding machining drawings and assembly drawings to produce the test adapter box.

[0013] Preferably, the test adapter box, LCR tester, sensor, transfer cable, and output cable form a multi-channel test device; The test adapter box is connected to the LCR tester through a transfer cable, and the test adapter box serves as the terminal for the sensor capacitance output; The sensor is connected to the input end of the test adapter box as the product to be tested through an output cable.

[0014] Preferably, the uniqueness of the input end of the LCR tester is amplified to the load quantity a required during the sensor test process through the test adapter box. The output line of the capacitance signal output by the sensor and the input interface of the corresponding test adapter box both have ground terminals; The number of sensor output channels is 3 and each channel requires 2 output ports. During the test process of the test adapter box, each sensor has 6 ports. The number of ports on the input panel of the test adapter box is 6X, where X is the number of sensors during each test process. During the sensor test, switch the sensor product according to the data recorded by the LCR tester, freely choose to test the output capacitance of the sensor at a preset time point or during a preset time period, and select any one of the products to be tested for testing or monitoring; The distribution of mechanical switches on the top plate of the test adapter box is determined according to the number of ports 6X on the input panel.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention amplifies the input capacity of the expensive LCR tester through the test adapter box to adapt to the number of sensors required in the actual production process, thereby significantly improving the test efficiency and accuracy, reducing the possibility of operator misoperation, reducing the difficulty of operation, and simplifying complex wiring operations to switch toggling; 2. The present invention transforms the originally cumbersome operations of wiring, disconnection, shielding layer connection, and switching into simple switch toggle operations, greatly simplifying the test process and improving work efficiency; 3. In the batch production process of the present invention, since the number of sensors that can be loaded at a time increases, the number of tests and time required are reduced accordingly, thereby greatly saving product testing costs and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 It is a structural schematic diagram of a multi-channel test device; Figure 2 A schematic diagram of the steps of a method for preparing a multi-channel testing device.

[0017] The figure shows: Test adapter box 1; LCR tester 2; sensor 3; adapter cable 4; output cable 5. DETAILED DESCRIPTION

[0018] The present invention will be described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, several changes and improvements can be made without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0019] Embodiment 1 Refer to Figure 1 and Figure 2 , according to a multi-channel test method applied to the test process provided by the present invention, the method includes the following steps: Step S1: Determine the number of products with load a during the test process; the method for determining the number of products with load a during the test process is as follows: the total number of sensors Y and the effective production time T in the order task, the time t required for a single test process, the number of test times x = T / t, and the number of products with load a during the test process = Y / x = Y·t / T.

[0020] Step S2: Determine the types and quantities of the input interfaces corresponding to the products required on the input panel of the adapter box according to the output signal type and quantity of the product to be tested; the specific method for determining the types and quantities of the input interfaces corresponding to the products required on the input panel of the adapter box according to the output signal type and quantity of the product to be tested is as follows: determine the number of wires b that a single sensor needs to be connected to the input panel of the test adapter box, and combine the number of products with load a = Y / x = Y·t / T determined in Step S1 to determine that the number of interfaces on the input panel of the test adapter box is Z = a·b = b·Y·t / T; the interface type is determined to be a BNC socket for docking with a radio frequency cable according to the sensor output capacitance signal, and determine the quantity and distribution of the BNC sockets on the input panel.

[0021] Step S3: Determine the wire types of the specially matched output cables required and the interface types corresponding to the product output end and the adapter box input end according to the product output port, output signal type, and number of output channels; confirm the BNC plug specifications of the adapter cable connecting the sensor to the test adapter box and the coaxial jack or alligator clip for connecting the sensor according to whether the end of the sensor lead-out wire is a stripped stranded wire or a crimped coaxial contact; at the same time, according to the number of products with load a = Y / x = Y·t / T during the test process; confirm the number of adapter cables required.

[0022] Step S4: Determine the number and layout of the corresponding input interfaces required on the test adapter box based on the product load quantity a determined in Steps S1, S2, and S3, the input interfaces on the input panel of the adapter box, the wire types corresponding to the output cables, and the interface types that match the products and the input ends of the adapter box. The specific method for determining the number and layout of the corresponding input interfaces required on the test adapter box based on the product load quantity a determined in Steps S1, S2, and S3, the input interfaces on the input panel of the adapter box, the wire types corresponding to the output cables, and the interface types that match the products and the input ends of the adapter box is as follows: Confirm according to the selected BNC socket the size of the holes to be drilled on the input panel of the test adapter box and the distance between the holes.

[0023] Step S5: Determine the method for switching different products of the same type during the product test based on the input interface types and quantities on the test adapter box determined in Step S4. The method for determining the method for switching different products of the same type during the product test based on the input interface types and quantities on the test adapter box determined in Step S4, where the specific method for selecting a relay or a mechanical switch is as follows: If the product input response is an instantaneous response and does not require a long time to charge to equilibrium, use a mechanical toggle switch, and only manual testing can be performed at the same time; If automatic switching of sensors is required, consider using a relay. When using a relay, it is necessary to consider the response time of the product from input to output to the LCR tester to determine the on-off time of the relay.

[0024] Step S6: Based on the mechanical switch determined in Step S5 as the action input for switching products and the number and layout of the input interfaces determined in Step S4, the layout of the mechanical switch of the test adapter box can be determined, and at the same time, the internal wiring method of the adapter box connecting the mechanical switch box and the sensor input end interface can be determined. Step S7: Based on the internal wiring method determined in Step S6, the layout of the mechanical switch, and the output interfaces on the output panel of the test adapter box determined by the input ports of the LCR tester, determine the input panel, output panel of the entire test adapter box and the distribution of the corresponding specific interfaces thereon, and determine the frame and size of the entire test adapter box. Determine the internal wiring method of the test adapter box and the distribution of the mechanical toggle switches on the upper panel according to the elements determined in Steps S1 - S5.

[0025] Step S8: Draw the corresponding machining drawings based on the test adapter box frame, dimensions, distribution of specific ports on the input and output panels, and wiring method determined in step S7, and then produce the test adapter box. Preferably, in step S1, the method for determining the number of products with load a during the test process is as follows: the total number of sensors Y and the effective production time T in the order task, the time t required for a single test process, the number of test times x = T / t, and the number of products with load a during the test process = Y / x = Y·t / T. Draw the corresponding machining drawings and assembly drawings based on the hole position distributions of the previously confirmed input panel, upper panel, and output panel, and finally produce the test adapter box and put it into use.

[0026] The test adapter box, LCR tester, sensor, transfer cable, and output cable form a multi-path test device applied to the test process; the test adapter box is connected to the LCR tester through the transfer cable, and the test adapter box serves as the terminal for the sensor capacitance output; the sensor serves as the product to be tested and is connected to the input end of the test adapter box through the output cable.

[0027] Amplify the uniqueness of the input end of the LCR tester to the number of products with load a required during the sensor test process through the test adapter box; the capacitance signal output by the sensor needs to use a specific high-frequency output line, and the corresponding input interface of the test adapter box needs to have a grounding end; the number of output paths of the sensor is 3, and each path requires 2 output ports, so it can be determined that each sensor requires 6 ports during the test process required by the test adapter box. The number of ports on the input panel of the test adapter box is 6X, where X is the number of sensors with load a at the same time during each test process. At the same time, determine its internal wiring method; during the sensor test process, switch the sensor products according to the data recording situation of the LCR tester, and freely choose to test the capacitance value output by the sensor at a certain time point or detect the capacitance value of the sensor during a certain specific time period, and select a certain product in the batch of test products to be tested or monitored; determine the distribution of mechanical switches on the top plate of the test adapter box according to the number of ports 6X on the input panel; during the process of the LCR tester testing the capacitance value of the sensor, it is necessary to determine the calibration method and test frequency of the LCR tester; the internal wiring method should determine the selected wire type and the grounding location of its wire shielding layer according to the number of ports on the input panel of the test adapter box and the type of signal transmitted.

[0028] Embodiment 2 Those skilled in the art can understand this embodiment as a more specific description of Embodiment 1.

[0029] This embodiment provides a multi-path test device applied to the test process, including: a test adapter box 1, an LCR tester 2, a sensor 3, a transfer cable 4, and an output cable 5.

[0030] Test adapter box 1: It is connected to the LCR tester 2 through the adapter cable 4 and serves as the terminal for the capacitance output of the sensor 3.

[0031] Sensor 3: As the product under test, it is connected to the input end of the test adapter box through the output cable 5.

[0032] The uniqueness of the input end of the LCR tester 2 is amplified to the required load quantity a during the test process of the sensor 3 through the test adapter box 1, so as to improve the utilization rate of expensive equipment without affecting the accuracy of the test results, reduce costs while improving the test efficiency, and bring great convenience to the operators at the same time; the capacitance signal output by the sensor 3 needs to use a specific high-frequency output line and the corresponding input interface of the test adapter box 1 must have a grounding end to stably transmit the capacitance signal; the number of output paths of the sensor 3 is 3, and each path requires 2 output ports to determine that each sensor 3 requires 6 ports during the test process required by the test adapter box 1. Therefore, the number of ports on the input panel of the test adapter box 1 can be determined as 6X (X is the quantity a of sensors 3 to be loaded simultaneously during each test process), and at the same time, its internal wiring method can be determined; during the test process of the sensor 3, switch the sensor 3 products according to the data recording situation of the LCR tester 2, and freely choose to test the output capacitance value of the sensor 3 at a certain time point or detect the capacitance value of the sensor 3 during a certain specific time period. At the same time, freely choose a certain product in the batch of test products to be tested or monitored. Determine the distribution of mechanical switches on the top plate of the test adapter box according to the number of ports 6X on the input panel; during the process of the LCR tester 2 testing the capacitance value of the sensor 3, it is necessary to determine the calibration method and test frequency of the LCR tester 2; the internal wiring method should determine the selected wire type and the grounding location of its wire shielding layer according to the number of ports on the input panel of the test adapter box 1 and the type of signal transmitted.

[0033] The present invention provides a multi-path test method applied to the test process. The method applies the multi-path test test device applied in the above to the test process, and the method includes the following steps: Step S1: Determine the number of products with load during the test. Step S2: Determine the types and quantities of the input interfaces corresponding to the products required on the input panel of the adapter box according to the types and quantities of the output signals of the products to be tested. Step S3: Determine the types of wires used for the specially matched output cables required and the interface types corresponding to the product output terminals and the adapter box input terminals according to the product output ports, output signal types, and the number of output channels. Step S4: Determine the quantity and layout of the corresponding input interfaces required on the test adapter box 1 according to the number of products with load a, the input interfaces on the input panel of the adapter box, the types of wires corresponding to the output cables, and the interface types matching the product and the adapter box input terminals determined in Steps S1, S2, and S3. Step S5: Determine the method for switching different products of the same type during the product test according to the types and quantities of the input interfaces on the test adapter box 1 determined in Step S4, where a relay or a mechanical switch can be selected. For the sensor 3, a mechanical switch can be selected. Step S6: Determine the layout of the mechanical switches on the test adapter box according to the mechanical switch used as the action input for switching products determined in Step S5 and the quantity and layout of the input interfaces determined in Step S4. Meanwhile, the internal wiring method of the adapter box connecting the mechanical switch box and the input terminal interface of the sensor 3 can be determined accordingly. Step S7: Determine the input panel, output panel, and the specific interface distribution thereon of the entire test adapter box 1 according to the internal wiring method, mechanical switch layout, and the output interfaces on the output panel of the test adapter box 1 determined in Step S6, which is determined by the input ports of the LCR tester, so as to determine the frame and size of the entire test adapter box 1. Step S8: Draw the corresponding machining drawings according to the frame, size, specific port distribution on the input and output panels, and wiring method of the test adapter box 1 determined in Step S7, and then produce the test adapter box 1.

[0034] In the said Step S1, the method for determining the number of products with load a during the test is the total number Y of the sensors 3 and the effective production time T in a certain order task, the time t required for a single test process, the number of test times x = T / t, and the number of products with load a during the test = Y / x = Y·t / T.

[0035] In the said Step S2, the specific method for determining the types and quantities of the input interfaces corresponding to the products required on the input panel of the adapter box according to the types and quantities of the output signals of the products to be tested is as follows: Determine the number of wires b that a single sensor 3 needs to be connected to the input panel of the test adapter box 1. Combining with the number of products with load a = Y / x = Y·t / T determined in Step S1, the number of interfaces on the input panel of the test adapter box 1 can be determined as Z = a·b = b·Y·t / T. The interface type can be determined as a BNC socket for docking with a radio frequency cable according to the output capacitance signal of the sensor 3. Thus, the quantity and distribution of the BNC sockets on the input panel can be determined.

[0036] In step S3, based on whether the end of the lead wire of sensor 3 is stripped and spread or a coaxial contact is crimped, the BNC plug specifications of the transfer cable 4 connecting sensor 3 to the test adapter box 1 and the coaxial jack or alligator clip connecting sensor 3 can be confirmed. At the same time, the number of transfer cables 4 required can be confirmed according to the product load quantity a = Y / x = Y·t / T during the test process.

[0037] In step S4, the specific method for determining the number and position arrangement of the corresponding input interfaces required on the test adapter box 1 according to the product load quantity a determined in steps S1, S2, and S3, the input interfaces on the input panel of the adapter box, the corresponding wire types of the output cables, and the interface types matching the product and the input end of the adapter box is as follows: It is confirmed according to the selected BNC socket the hole size to be opened on the input panel of the test adapter box 1 and the distance between holes.

[0038] In step S5, according to the input interface types and quantities on the test adapter box 1 determined in step S4, the method of switching different products of the same type during the product test is determined. The specific method for selecting a relay or a mechanical switch is as follows: If the product input response is an instantaneous response and does not require a long time to charge to equilibrium, a mechanical toggle switch can be used, and only manual testing can be performed at the same time; if automatic switching of sensors is required, a relay can be considered. When using a relay, the response time of the product from input to output to the LCR tester 2 needs to be considered, so as to determine the on-off time of the relay. The sensor example given in the present invention is a capacitance signal that requires a charging time, so a mechanical toggle switch is adopted.

[0039] In steps S6 and S7, the internal wiring method of the test adapter box 1 and the distribution of the mechanical toggle switches on the upper panel can be determined according to the elements determined in steps S1 - S5.

[0040] In step S8, the corresponding machining drawing and assembly drawing can be drawn according to the hole position distributions of the previously confirmed input panel, upper panel, and output panel, and finally the test adapter box 1 is produced and put into use.

[0041] The present invention effectively expands the input capacity of expensive LCR testers through the adapter box, meets the test requirements of a large number of sensors, improves the test efficiency and accuracy, reduces the operation difficulty and the risk of misoperation, simplifies the complex wiring into switch operations, and greatly optimizes the test process.

[0042] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. Without conflict, the embodiments of the present application and the features in the embodiments can be combined arbitrarily with each other.

Claims

1. A method for preparing a multi-channel testing device, characterized in that: The steps include: Step S1: Determine the load quantity a of the product to be tested during the test; Step S2: Determine the type and quantity of input interfaces on the input panel of the test adapter box corresponding to the product to be tested according to the type and quantity of output signals of the product to be tested; Step S3: Determine the type of wire used in the matching output cable and the interface type corresponding to the output end of the product to be tested and the input end of the test adapter box according to the output port, output signal type and number of output channels of the product to be tested; Step S4: Determine the number and position arrangement of the corresponding input interfaces on the test adapter box according to the load quantity a of the product to be tested determined in step S1, step S2, and step S3, the input interface on the input panel of the test adapter box, the wire type corresponding to the output cable, and the interface type matching the product to be tested and the input end of the test adapter box; Step S5: determining a method for switching between different products of the same type during the test of the product to be tested according to the type and number of input interfaces on the test adapter box determined in step S4; Step S6: according to the mechanical switch determined in step S5 as the action input for switching the product to be tested and the number and position arrangement of the input interface determined in step S4, the arrangement of the mechanical switch of the test adapter box is determined, and the internal wiring method of the test adapter box connected to the mechanical switch box sensor input terminal interface is determined; Step S7: According to the internal wiring mode, mechanical switch arrangement, output interface on the output panel of the test adapter box, and input port of the LCR tester determined in step S6, the input panel, output panel and corresponding interface distribution of the entire test adapter box are determined, and the frame and size of the entire test adapter box are determined; Step S8: Draw the corresponding machining drawings according to the test adapter box frame, size, input panel, port distribution on the output panel, and wiring method determined in step S7, and produce the test adapter box.

2. The method for preparing a multi-channel testing device according to claim 1, characterized in that: In step S1, the method for determining the load quantity a of the product to be tested during the test process is: The total number of sensors in the order task is Y and the effective production time is T, the time required for a single test process is t, the number of tests is x=T / t, and the number of products to be tested is a=Y / x=Y·t / T.

3. The method for preparing a multi-channel testing device according to claim 1, characterized in that: In step S2, the specific method for determining the type and number of input interfaces on the input panel of the test adapter box corresponding to the product to be tested according to the type and number of output signals of the product to be tested is: Determine the number of wires b connected to the input panel of the test adapter box of a single sensor, and determine the number of interfaces on the input panel of the test adapter box as Z=a·b=b·Y·t / T based on the number of loads a=Y / x=Y·t / T of the product to be tested in the test process determined in step S1; The interface type is determined as a BNC socket connected to the radio frequency cable according to the output capacitance signal of the sensor, and the number and distribution of the BNC sockets on the input panel are determined.

4. The method for preparing a multi-channel testing device according to claim 1, characterized in that: In step S3, according to whether the end of the sensor lead wire is a stripped loose wire or a crimped coaxial contact, the specifications of the BNC plug of the adapter cable connecting the sensor to the test adapter box and the coaxial jack or alligator clip connected to the sensor are confirmed; At the same time, according to the load quantity of the product to be tested in the test process a=Y / x=Y·t / T, confirm the number of adapter cables required.

5. The method for preparing a multi-channel testing device according to claim 1, characterized in that: In step S4, according to the load quantity a of the product to be tested determined in steps S1, S2, and S3, the input interface on the input panel of the test adapter box, the wire type corresponding to the output cable, and the interface type matching the product to be tested and the input end of the test adapter box, the specific method for determining the number and position arrangement of the corresponding input interfaces on the test adapter box is as follows: According to the selected BNC socket, confirm the size of the hole opened on the input panel of the test adapter box and the distance between the holes.

6. The method for preparing a multi-channel testing device according to claim 1, characterized in that: In step S5, according to the type and number of input interfaces on the test adapter box determined in step S4, the specific method for determining the mode of switching between different products of the same type during the test of the product to be tested is: If the input response of the product to be tested is instantaneous, use a mechanical toggle switch; If it is an automatically switched sensor, a relay is used, and the on-off time of the relay is determined according to the response time of the product to be tested from input to output to the LCR tester.

7. The method for preparing a multi-channel testing device according to claim 1, characterized in that: In the step S6 and step S7, the internal wiring mode of the test adapter box and the distribution of the mechanical toggle switches on the upper panel are determined according to the factors determined in the step S1 to step S5.

8. The method for preparing a multi-channel testing device according to claim 1, characterized in that: In step S8, according to the hole position distribution of the input panel, the upper panel and the output panel determined in the previous step, the corresponding machining drawings and assembly drawings are drawn to produce the test adapter box.

9. The method for preparing a multi-channel testing device according to claim 1, characterized in that: The test adapter box, LCR tester, sensor, adapter cable and output cable constitute a multi-channel test device; The test adapter box is connected to the LCR tester via an adapter cable, and the test adapter box serves as a terminal for the sensor capacitance output; The sensor is used as a product to be tested and is connected to the input end of the test adapter box through an output cable.

10. The method for preparing a multi-channel testing device according to claim 9, characterized in that: The uniqueness of the LCR tester input terminal is amplified to the load quantity a required in the sensor test process through the test adapter box; The output line of the capacitance signal output by the sensor and the input interface of the corresponding test adapter box both have ground terminals; The number of sensor output channels is 3 and each channel requires 2 output ports. During the test process of the test adapter box, each sensor has 6 ports. The number of ports on the input panel of the test adapter box is 6X, where X is the number of sensors during each test process. During the sensor test, switch the sensor product according to the data recorded by the LCR tester, freely choose to test the output capacitance of the sensor at a preset time point or during a preset time period, and select any one of the products to be tested for testing or monitoring; The distribution of mechanical switches on the top plate of the test adapter box is determined according to the number of ports 6X on the input panel.

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