CN116819309A - Standardized testing device and method for on-resistance of relay sampling switch product - Google Patents
Standardized testing device and method for on-resistance of relay sampling switch product Download PDFInfo
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Abstract
The invention discloses a standardized testing device and method for on-resistance of a relay sampling switch product, which relate to the field of testing contact resistance of an electromagnetic relay and comprise the following steps: the digital multimeter is used for detecting the resistance of the tested relay sampling switch product and sending the detected resistance value to the upper computer; the special interface box is used for converting the signal of the output port type of the test case into the signal of the set port type and transmitting the signal of the set port type to the detection end of the digital multimeter; the test case is used for receiving a switch signal sent by the upper computer and connecting the resistor of the tested relay sampling switch product with a port on the special interface case according to the switch signal; the upper computer is used for sending a switching signal to the test case, receiving a corresponding detected resistance value, and calculating the resistance value of the tested relay sampling switch product. The invention can improve the compatibility of the test fixture for the standardized test of the on-resistance of the relay sampling switch product.
Description
Technical Field
The invention relates to the field of electromagnetic relay contact resistance testing, in particular to a device and a method for standardized testing of on-resistance of a relay sampling switch product.
Background
The relay sampling switch product is mainly applied to multipath selection test in engineering. A relay sampling switch product often comprises N (N can be 40, 60, etc.) electromagnetic relays as important components. The on-resistance is formed by the series connection of the contact resistances of a plurality of relays of a certain channel inside the product.
At present, the types of sampling switch products are gradually increased, and the number of the products is also increased year by year. The test adopts a semi-automatic test mode of a single product, the test means is behind, the error rate of the test tool is high, the management means is behind, and the test efficiency is low.
When the product delivery is tested, the customized products and the general products of the sampling switch are often appeared on the same production line, so that the factory testing work of the product brings about the waste of manpower and working hours, and the sampling switch mainly comprises: (1) The connector types of the two customized products are consistent, but the wiring relationship inside the connector is inconsistent, so that the test tools of the two products are inconsistent; (2) The types of the two general product connectors are inconsistent, but the functions of the products are consistent, so that the test tools of the two products are inconsistent; (3) With the technical innovation, the universal product is gradually updated, so that the traditional test tool can not meet the test requirement.
Specifically, the general product, the product wiring and the connector selection are advanced, and the current mainstream technical requirements are met; custom products have specificity for connectors and wiring due to military model requirements or user specific requirements, but still meet the current mating use requirements of certain proprietary or custom systems for the user. And general product and customization product, product test fixture often not general, brings efficiency and personnel's waste for the test. In the automatic test of the product, in order to cope with different measuring systems, the types of sampling switches are different, and manufacturers are different. And the wiring of the products and the model of the connector are different from different products of different manufacturers. Taking resistance measurement as an example, in a four-wire resistance measurement path, a multi-channel sampling switch (the number of the switches can be 24 paths, 32 paths, 48 paths and the like) is selected as a solution for product multi-channel measurement, and then the on-resistance of each sampling switch in the path becomes a problem to be dealt with. The problems of a plurality of switches, the time length caused by manual dotting and the like lead the testing work efficiency of a tester to be low and the accuracy to be low. The test channels of the relay products are normally selected from double-knife single-set relays. In the traditional test scheme, after one (high point) of the relays from 1 to N (N can be 24, 32 or 64, etc.) is tested, the input end of the test instrument needs to be manually replaced by the other (low point) of the relay, which is time-consuming and labor-consuming and also brings about manual waste.
In the conventional test, each product has one set of test cable, and the test cables of each product are different and are universal, and N products need N kinds of test cables. Because the product types are multiple, the test times are multiple, the environment is built, the working hours are wasted, the test cable plug and the contact pin are easy to damage, the repair rate is high, and the test progress is delayed. In view of the requirements of cost reduction and synergy, an automatic test fixture with strong compatibility and high reliability is needed to meet the test requirements, and is convenient to manage and produce, test and apply.
Disclosure of Invention
The invention aims to provide a standardized test device and method for the on-resistance of a relay sampling switch product, which can improve the compatibility of a test tool for standardized test of the on-resistance of the relay sampling switch product.
In order to achieve the above object, the present invention provides the following solutions:
the device comprises a digital multimeter, a special interface box, a test case and an upper computer;
the digital multimeter is connected with the upper computer; the digital multimeter is used for detecting the resistance of the tested relay sampling switch product and sending the detected resistance value to the upper computer;
The special interface box is respectively connected with the test case and the digital multimeter; the special interface box is used for converting the signal of the output port type of the test case into the signal of the set port type and transmitting the signal of the set port type to the detection end of the digital multimeter;
the test case is connected with the upper computer; the tested relay sampling switch product is placed in the test case; the test case is used for receiving a switch signal sent by the upper computer and connecting the resistor of the tested relay sampling switch product with a port on the special interface case according to the switch signal;
the upper computer is used for sending the switch signal to the test case, receiving a corresponding detected resistance value, and calculating the resistance value of the tested relay sampling switch product according to the corresponding detected resistance value.
Optionally, the digital multimeter is connected with the upper computer through a communication interface; the communication interface is a GPIB interface, an RS232 interface or a LAN interface.
Optionally, the digital multimeter detects the resistance of the tested relay sampling switch product by adopting a four-wire resistance measurement method.
Optionally, the test case includes a first interface switch and a second interface switch; the special interface box comprises a first signal interface, a second signal interface, a tested product signal interface and a resistor output port; the resistor output port comprises a negative end interface and a positive end interface;
the negative end of the resistance measuring end of the digital multimeter is connected with the negative end interface of the resistance output port; the negative terminal interface is connected with a sampling public end of the first signal interface; the sampling public end of the first signal interface is connected with the sampling public end of the first interface switch; the channel interface end of the first interface switch is correspondingly connected with the channel interface end of the first signal interface; the channel interface end of the first signal interface is connected with the sampling public end of the second signal interface; the sampling public end of the second signal interface is connected with the sampling public end of the second interface switch; the channel interface end of the second interface switch is correspondingly connected with the channel interface end of the second signal interface; the channel interface end of the second signal interface is connected with the channel interface end of the tested product signal interface; the channel interface end of the signal interface of the tested product is connected with the channel interface end of the sampling switch product of the tested relay; the sampling public end of the tested relay sampling switch product is connected with the sampling public end of the tested product signal interface; the sampling public end of the tested product signal interface is connected with the positive end interface of the resistor output port; the positive end interface of the resistance output port is connected with the positive end of the resistance measuring end of the digital multimeter;
The first interface switch and the second interface switch are used for connecting the resistance of the corresponding relay sampling switch product to be tested with the digital multimeter according to the switch signal.
Optionally, the first interface switch includes a front-end sampling relay, a first front-end channel relay, and a second front-end channel relay; the second interface switch comprises a back-end sampling relay and a back-end channel relay;
the sampling public end of the first signal interface is connected with one end of the front-end sampling relay; the other end of the front-end sampling relay is connected with one end of the first front-end channel relay and one end of the second front-end channel relay respectively; the other end of the first front-end channel relay and the other end of the second front-end channel relay are correspondingly connected with the channel interface end of the first signal interface;
the sampling public end of the second signal interface is connected with one end of the rear end sampling relay of the second interface switch; the other end of the rear-end sampling relay is connected with one end of the rear-end channel relay; the other end of the back-end channel relay is correspondingly connected with the channel interface end of the second signal interface.
Optionally, the first interface switch is a sampling switch module or a matrix switch module; the second interface switch is a sampling switch module or a matrix switch module.
Optionally, the front-end sampling relay, the first front-end channel relay, the second front-end channel relay, the back-end sampling relay and the back-end channel relay are all double-blade single-set relays.
Optionally, one output contact in the other end of the first front-end channel relay is connected with one input contact in one end of the back-end sampling relay; one output contact in the other end of the second front-end channel relay is connected with the other input contact in one end of the back-end sampling relay.
Optionally, the signal interfaces of the special interface box are all aviation round multi-core connectors or D-shaped multi-core connectors.
The standardized test method for the on-resistance of the relay sampling switch product is applied to the standardized test device for the on-resistance of the relay sampling switch product, and comprises the following steps:
acquiring an on-resistance value acquired by the digital multimeter; the on-resistance value is the series resistance value of a tested relay sampling switch product, a special interface box and a test box which are connected in series in the same circuit;
Acquiring a loop resistance value acquired by the digital multimeter; the loop resistance value and the tested relay sampling switch product are connected in series with the series resistance value of the special interface box and the test box in the same circuit;
and subtracting the loop resistance value from the on-resistance value to obtain the resistance value of the tested relay sampling switch product.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the standardized testing device and method for the on-resistance of the relay sampling switch product, the standardized testing of the sampling switch product is realized by introducing the special interface box. The test cable has the characteristics of easy management, high efficiency, high reliability of the tool cable, accurate measurement precision and strong compatibility, and after the test is finished, the test cable can be stored in a special interface box, so that the management is easy and the test cable is not easy to lose; the signal interfaces in the special interface box are all aerospace connectors, so that the special interface box is not easy to damage, convenient to plug and high in reliability; the products to be tested are different, but the test platforms are the same. The management difficulty of a large number of special test tools is effectively reduced, and the test efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of hardware connection of a standardized test device for on-resistance of a relay sampling switch product;
FIG. 2 is a schematic diagram of a digital multimeter connection provided by the present invention;
FIG. 3 is a schematic diagram illustrating connection between a first interface switch and a first signal interface according to the present invention;
fig. 4 is a schematic diagram of connection between a second interface switch and a second signal interface, and between a first tested product and a third signal interface provided by the present invention;
FIG. 5 is a schematic diagram showing the connection between the second tested product and the fourth signal interface, and between the third tested product and the fifth signal interface;
FIG. 6 is a schematic diagram of a fourth tested product and a sixth signal interface according to the present invention;
FIG. 7 is a schematic block diagram of an on-resistance measurement according to the present invention;
FIG. 8 is a test flow chart of the standardized test device for on-resistance of the relay sampling switch product provided by the invention;
FIG. 9 is a schematic diagram of loop resistance measurement provided by the present invention;
FIG. 10 is a flow chart of the read and storage of the resistance value of the tested relay sampling switch product provided by the invention;
fig. 11 is a flowchart of a standardized test method for on-resistance of a relay sampling switch product provided by the invention.
Reference numerals illustrate:
the system comprises a first cable-1, a second cable-2, a third cable-3, a fourth cable-4, a fifth cable-5, a sixth cable-6, a seventh cable-7, an eighth cable-8, a ninth cable-9, a tenth cable-10, an eleventh cable-11, a twelfth cable-12, a test case-13, a special interface case-14, a four-wire resistance output port positive end-15, a four-wire resistance output port negative end-16, a first interface switch-17, a first signal interface-18, a sampling common end-19 of the second signal interface, a third channel-n-th channel reserved signal interface-20, a first channel-21, a second channel-22, a n-th channel-23, a second interface switch-24, a second signal interface-25, a third signal interface-26, a first tested product-27, a fourth signal interface-28, a fifth signal interface-29, a second tested product-30, a third tested product-31, a fourth tested product-32, and a sixth signal interface-33.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a standardized test device and method for the on-resistance of a relay sampling switch product, which can improve the compatibility of a test tool for standardized test of the on-resistance of the relay sampling switch product.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
As shown in fig. 1-6, the on-resistance standardized testing device for the relay sampling switch product provided by the invention comprises a digital multimeter, a special interface box 14, a testing machine box 13 and an upper computer.
The digital multimeter is connected with the upper computer; the digital multimeter is used for detecting the resistance of the tested relay sampling switch product and sending the detected resistance value to the upper computer. Specifically, the digital multimeter is connected with the upper computer through a communication interface; the communication interface is a GPIB interface, an RS232 interface or a LAN interface. Further, the digital multimeter adopts a four-wire resistance measurement method to detect the resistance of the tested relay sampling switch product.
In practical application, the digital multimeter is a testing instrument with four-wire resistance measuring function and precision meeting testing requirements, and specifically, the digital multimeter is KeySight 34410a of german corporation in the united states. The digital multimeter must be within the expiration date of the metering assay. The second communication interface is any interface which can meet the communication between the upper computer and the digital multimeter, such as GPIB interface, RS232 interface or LAN interface. The tenth cable 10 is a cable matched with the communication mode of the host computer and the second communication interface, for example, a GPIB cable, an RS232 cable, a LAN cable. The digital multimeter is responsible for the selection of the on-resistance measuring function, and the acquisition and readback of the measuring result. The on-resistance value of the relay is small, about 0Ω -0.5Ω. And because the two-wire resistance measurement error of the digital multimeter is larger, a four-wire resistance measurement mode is adopted. Four-wire resistance measurement adopts a connection mode of four cables, the resistance value of the cable can be effectively removed from a measurement result, and the accuracy of the measurement result is high.
The special interface box 14 is respectively connected with the test case 13 and the digital multimeter; the special interface box 14 is configured to convert a signal of an output port type of the test case 13 into a signal of a set port type, and transmit the signal of the set port type to a detection end of the digital multimeter.
In practice, the dedicated interface box 14 is responsible for providing a standardized platform for different products under test, and for providing signal transfer and transmission paths. The special interface box 14 is a three-dimensional space structure with any box body matched with the first signal interface 18 to the sixth signal interface 33 and four-wire resistor output ports. The purpose of the dedicated interface box 14 is to provide structural support for the above signal interfaces and cables and to provide storage space for the first cable 1 to the twelfth cable 12.
The test case 13 is connected with the upper computer; the tested relay sampling switch product is placed in the test case; the test case 13 is configured to receive a switching signal sent by the upper computer, and connect the resistor of the tested relay sampling switch product with the port on the special interface case 14 according to the switching signal.
In practice, the test case 13 is responsible for providing a working environment for the product under test and the interface switch.
The upper computer is used for sending the switch signal to the test case 13, receiving a corresponding detected resistance value, and calculating the resistance value of the tested relay sampling switch product according to the corresponding detected resistance value.
In practical application, the upper computer is not only responsible for controlling the channel switching of the tested product; the switching of the interface switch is controlled; the digital multimeter is also controlled to realize acquisition and reading of measurement results; and finally, storing and processing the test data. Specifically, the upper computer is a computer with complete input and output equipment, an operating system and normal control software installation. The computer can independently run control software, and the program runs smoothly without jamming. The control software can be LabView, labWindows/CVI, C# or the like. The eleventh cable 11 is a cable that matches the communication mode of the host computer and the first communication interface, for example, a LAN cable.
As a specific embodiment, the test case 13 includes a first interface switch 17 and a second interface switch 24; the special interface box 14 comprises a first signal interface 18, a second signal interface 25, a tested product signal interface and a resistor output port; the resistor output ports all comprise a negative end interface and a positive end interface.
The negative end of the resistance measuring end of the digital multimeter is connected with the negative end interface of the resistance output port; the negative terminal interface is connected with a sampling public end of the first signal interface; the sampling public end of the first signal interface is connected with the sampling public end of the first interface switch; the channel interface end of the first interface switch is correspondingly connected with the channel interface end of the first signal interface; the channel interface end of the first signal interface is connected with the sampling public end 19 of the second signal interface; the sampling common terminal 19 of the second signal interface is connected with the sampling common terminal of the second interface switch; the channel interface end of the second interface switch is correspondingly connected with the channel interface end of the second signal interface; the channel interface end of the second signal interface is connected with the channel interface end of the tested product signal interface; the channel interface end of the signal interface of the tested product is connected with the channel interface end of the sampling switch product of the tested relay; the sampling public end of the tested relay sampling switch product is connected with the sampling public end of the tested product signal interface; the sampling public end of the tested product signal interface is connected with the positive end interface of the resistor output port; and the positive end interface of the resistance output port is connected with the positive end of the resistance measuring end of the digital multimeter.
The first interface switch 17 and the second interface switch 24 are used for connecting the resistance of the corresponding relay sampling switch product to be tested with the digital multimeter according to the switch signal.
Specifically, the first interface switch 17 includes a front-end sampling relay, a first front-end channel relay, and a second front-end channel relay; the second interface switch 24 includes a back-end sampling relay and a back-end channel relay.
In practical application, as shown in fig. 9, the front-end sampling relay is a switch connected to the sampling common end of the first interface switch, the first front-end channel relay is a switch connected to the first channel of the first interface switch, the second front-end channel relay is a switch connected to the second channel to the nth channel of the first interface switch, the rear-end sampling relay is a switch connected to the sampling common end of the second interface switch, and the rear-end channel relay is a switch connected to the first channel to the second channel of the second interface switch.
The negative end of the resistance measuring end of the digital multimeter is connected with the negative end interface of the resistance output port; the negative terminal interface is connected with a sampling public end of the first signal interface; the sampling public end of the first signal interface is connected with one end of the front-end sampling relay; the other end of the front-end sampling relay is connected with one end of the first front-end channel relay and one end of the second front-end channel relay respectively; the other end of the first front-end channel relay and the other end of the second front-end channel relay are correspondingly connected with the channel interface end of the first signal interface; the channel interface end of the first signal interface is connected with the sampling public end 19 of the second signal interface; the sampling common end 19 of the second signal interface is connected with one end of a rear end sampling relay of the second interface switch 24; the other end of the rear-end sampling relay is connected with one end of the rear-end channel relay; the other end of the back-end channel relay is correspondingly connected with the channel interface end of the second signal interface; the channel interface end of the second signal interface is connected with the channel interface end of the tested product signal interface; the channel interface end of the signal interface of the tested product is correspondingly connected with the channel interface end of the sampling switch product of the tested relay; the sampling public end of the tested relay sampling switch product is connected with the sampling public end of the tested product signal interface; the sampling public end of the tested product signal interface is connected with the positive end interface of the resistor output port; and the positive end interface of the resistance output port is connected with the positive end of the resistance measuring end of the digital multimeter.
As a specific embodiment, the first interface switch 17 is a sampling switch module or a matrix switch module; the second interface switch 24 is a sampling switch module or a matrix switch module.
As a specific embodiment, the front-end sampling relay, the first front-end channel relay, the second front-end channel relay, the back-end sampling relay, and the back-end channel relay are all double-pole single-set relays. Further, one output contact in the other end of the first front-end channel relay is connected with one input contact in one end of the back-end sampling relay; one output contact in the other end of the second front-end channel relay is connected with the other input contact in one end of the back-end sampling relay.
As a specific embodiment, the interfaces of the special interface box 14 are all aviation round multi-core connectors or D-shaped multi-core connectors.
Specifically, the dedicated interface box 14 includes a first signal interface 18, a second signal interface 25, a third signal interface 26, a fourth signal interface 28, a fifth signal interface 29, a sixth signal interface 33, and four-wire resistive output ports and cables. The tested product signal interfaces comprise a third signal interface 26, a fourth signal interface 28, a fifth signal interface 29 and a sixth signal interface 33; the functions of the components are as follows:
The four-wire resistor output port is composed of four wiring terminals, namely, a connector of a single node with each wiring terminal having a conductive function, is connected with the digital multimeter and the four-wire resistor input port through a ninth cable 9, and provides a test interface for four-wire resistor measurement. The first to sixth signal interfaces 18 to 33 are one highly reliable type of connector, specifically, an aviation round multi-core connector or a D-type multi-core connector; taking the number of the tested products as 4 as an example, namely, the tested products are respectively connected with the first interface switch 17, the second interface switch 24 and the first tested products 27 to the fourth tested products 32 through the third cable 3 to the eighth cable 8 to provide signal transmission channels for the tested products; the high-reliability connector is adopted, so that the stability of signal transmission can be kept, and the damage risk caused by repeated plugging can be avoided; the connector of the same type is adopted, the standardization of the connectors of different types of tested products can be completed, the third cable 3 to the eighth cable 8 can be manufactured in a one-to-one mode of the core point numbers of the connectors at the two ends, the manufacture is simple, the error rate is low, and the management is convenient. In addition, the reserved signal interfaces 20 of the third channel through the nth channel of the first signal interface 18 are reserved interfaces when the number of the tested products is 4.
The first cable 1, the second cable 2 and the twelfth cable 12 are internal connection wires of the special interface box 14, and can be completed through the PCB wiring, or can be completed through other modes (such as a mode of combining the PCB wiring and the flying lead cable). The function of this is to complete the signal connection and conversion between the four-wire resistor output port, the first signal interface 18 and the sixth signal interface 33.
The schematic diagram of the interface relationship of the individual components of the dedicated interface box 14 is shown in fig. 7. The specific connection relationship is briefly described as follows:
the first cable 1 is responsible for completing both the connection of the first signal interface 18 and the second signal interface 25 and the connection of the second signal interface 25 and the third signal interface 26 to the sixth signal interface 33; specifically, the first knife of the first channel 21 of the first signal interface is connected with the first knife of the sampling common end of the second interface switch, so that the establishment of a first knife test path of the tested module channel is completed; the first knife of the second channel 22 of the first signal interface is connected with the second knife of the sampling common end of the second interface switch, so that the establishment of a second knife test path of the tested module channel is completed. The first to nth channels 23 of the second signal interface and the first to nth channels 23 of the third signal interface are connected one to one in the order of the first knife and the second knife (the value of n is 24 or 32 or 48, etc.). The first channel to the n-th channel of the second signal interface and the first channel to the n-th channel of the fourth signal interface are connected one to one according to the sequence of the first knife and the second knife. The first channel to the nth channel of the second signal interface are connected one-to-one with the first channel to the nth channel of the fifth signal interface in the order of the first knife and the second knife. The first channel to the n-th channel of the second signal interface are connected one-to-one with the first channel to the n-th channel of the sixth signal interface in the order of the first knife and the second knife.
The second cable 2 is used for connecting the sampling common ends of the third signal interface 26 to the sixth signal interface and the sampling common end of the first signal interface with four-wire resistor output ports respectively; after a first knife and a second knife of a sampling public end of a first signal interface are in short circuit, two wires with equal length are led out and connected to a negative end 16 of a four-wire resistor output port; after the first knife and the second knife of the sampling public end of the third signal interface are in short circuit, two wires with equal length are led out and connected to the positive end 15 of the four-wire resistor output port; after the first knife and the second knife of the sampling public end of the fourth signal interface are in short circuit, two wires with equal length are led out and connected to the positive end 15 of the four-wire resistor output port; after the first knife and the second knife of the sampling public end of the fifth signal interface are in short circuit, two wires with equal length are led out and connected to the positive end 15 of the four-wire resistor output port; after the first knife and the second knife of the sampling common end of the sixth signal interface are in short circuit, two wires with equal length are led out and connected to the positive end 15 of the four-wire resistor output port.
The twelfth cable 12 is responsible for completing the second signal interface with the first signal interface 18; the first knife of the sampling public end of the second signal interface is connected with the first knife of the first channel of the first signal interface; the second knife of the sampling common end of the second signal interface is connected with the first knife of the second channel of the first signal interface.
The test case 13 is any test case 13 that provides a use environment for the first interface switch 17, the second interface switch 24, the first product under test 27 to the fourth product under test 32. The first communication interface is any interface which is suitable for the upper computer to communicate with all components in the test case 13; the first interface switch 17 is a multi-channel sampling switch, and the number of channels is more than or equal to 2; the on-resistance of each channel is less than 0.1 omega; the first interface switch 17 is used for realizing automatic switching of the on-resistance measurement of two knives of each channel of the tested product; the second interface switch 24 is a multi-channel sampling switch, and the number of channels is greater than or equal to that of the channels of the product to be tested; the on-resistance of each channel is less than 0.1 omega; the second interface switch 24 is used for realizing automatic switching of all channels of the tested product; the first to fourth products 27 to 32 are sampling switch products of different connectors, different manufacturers, and different versions.
The third cable 3 to the ninth cable 9 function to complete the signal transmission between the test box 13 and the dedicated interface box 14. The third cable 3 is made of a single AFR250-0.15mm 2 The length of the multi-strand cable bundle manufactured by silver-plated cables with high temperature resistance of more than 250 ℃ is 600 mm. Connectors at two ends of the cable bundle are respectively matched with the first signal interface 18 and the first interface switch 17 in a connection mode that the two connectors are connected one by one according to point numbers; the fourth cable 4 is composed of Single AFR250-0.15mm 2 The length of the multi-strand cable bundle manufactured by silver-plated cables with high temperature resistance of more than 250 ℃ is 600 mm. Connectors at two ends of the cable bundle are respectively matched with the second signal interface and the second interface switch, and the two connectors are connected one by one according to the point number; the fifth cable 5 is made of a single AFR250-0.15mm 2 The length of the multi-strand cable bundle manufactured by silver-plated cables with high temperature resistance of more than 250 ℃ is 600 mm. The connectors at the two ends of the cable bundle are respectively matched with the first tested product 27 and the third signal interface 26 in a way that the two connectors are connected one by one according to the point number; the sixth cable 6 is made of a single AFR250-0.15mm 2 The length of the multi-strand cable bundle manufactured by silver-plated cables with high temperature resistance of more than 250 ℃ is 600 mm. The connectors at the two ends of the cable bundle are respectively matched with the second tested product 30 and the fourth signal interface 28 in a way that the two connectors are connected one by one according to the point number; the seventh cable 7 is made of a single AFR250-0.15mm 2 The length of the multi-strand cable bundle manufactured by silver-plated cables with high temperature resistance of more than 250 ℃ is 600 mm. The connectors at the two ends of the cable bundle are respectively matched with the third tested product 31 and the fifth signal interface 29, and the connection mode is that the two connectors are connected one by one according to the point number; the eighth cable 8 is made of a single AFR250-0.15mm 2 The length of the multi-strand cable bundle manufactured by silver-plated cables with high temperature resistance of more than 250 ℃ is 600 mm. Connectors at two ends of the cable bundle are respectively matched with the fourth tested product 32 and the sixth signal interface 33, and the connection mode is that the two connectors are connected one by one according to point numbers; the ninth cable 9 is a connection cable of the four-wire resistor output port and the four-wire resistor input port, the cable is four wires with equal length, and two ends of the cable are banana head terminals or other connection terminals. When four-wire resistance is measured, the four wires are equal in length, so that the influence of the internal resistance of the wires on measured data can be effectively avoided.
In fig. 1, the host computer is connected to the first communication interface through an eleventh cable 11. The functions completed by the upper computer are as follows:
the upper computer completes handshake and communication with the test case 13 and completes test flow control of the first to fourth tested products 27 to 32 and the first and second interface switches 17 and 24. Taking the on-resistance test flow of the first channel of the tested product as an example, the test flow is as follows:
the first step, the upper computer controls the first channel of the first tested product to be closed. At this time, the first channel of the first product under test is conducted with the sampling common terminal of the first product under test.
And step two, the upper computer controls the first channel of the second interface switch to be closed. At this time, the first channel of the second interface switch is conducted with the sampling common end of the second interface switch; meanwhile, the sampling common end of the second interface switch is also conducted with the sampling common end of the first tested product.
Third, the upper computer controls the first channel of the first interface switch to be closed. At this time, the first channel of the first interface switch is conducted with the sampling common end of the first interface switch; at the same time, the first knife of the sampling common end of the first interface switch and the first knife of the sampling common end of the first tested product are also conducted.
And fourthly, the upper computer controls the digital multimeter to switch to a four-wire resistance measurement gear, the upper computer controls the digital multimeter to conduct four-wire resistance measurement, and then the upper computer controls the digital multimeter to read four-wire resistance test data. And finishing the on-resistance test control process of the first knife of the first channel of the first tested product.
And fifthly, the upper computer controls the second channel of the first interface switch to be closed. At this time, the second channel of the first interface switch is conducted with the sampling common end of the first interface switch; at the same time, the second knife of the sampling common end of the first interface switch and the second knife of the sampling common end of the first tested product are also conducted.
Repeating the fourth control process to finish the on-resistance test control process of the second knife of the first channel of the first tested product; the control process of other channels of the first tested product is consistent with that of the first channel; the control process of the second measured product 30 to the fourth measured product 32 is identical to that of the first measured product.
And sixthly, connecting the upper computer with a second communication interface through a tenth cable, and completing handshake and communication with the digital multimeter.
The specific actual operation test process is shown in fig. 8, and mainly comprises the following steps:
(1) Initializing, including: initializing a tested product, initializing an interface switch, initializing a digital multimeter and initializing a data table.
(2) The first interface switch channel is assigned a value, initial value Y is 1.
(3) The measured product channel is assigned a value, and the initial value X is 1.
(4) The product channel X to be tested is closed and the second interface switch channel X is closed.
(5) And after the first interface switch channel Y is closed, delaying.
(6) The resistance value is read back, and the four-wire resistance measurement VVx of the digital multimeter is read back.
(7) The measured value Vx is calculated, vx=vvx-Rx, rx being the loop resistance of the x channel.
(8) And (5) temporary storage of data.
(9) Judging whether the channel resistance test is finished; when the channel resistance test is not finished, x=x+1 returns to step (3).
(10) When the channel resistance test is finished, judging whether the measurement of the first interface switch channel Y is finished or not; when the measurement of the first interface switch channel Y is ended, y=y+1, and the procedure returns to step (2).
(11) And when the measurement of the first interface switch channel Y is finished, storing data, and closing the worksheet.
(12) The tested product is closed, the interface switch is closed, the digital multimeter is closed, and the data table is closed.
As shown in fig. 10, taking KeySight34410a digital multimeter of germany corporation as an example, the control process of the digital multimeter by the upper computer includes:
(1) Instrument parameter selection, including resource configuration and port configuration.
(2) And (5) configuring an instrument.
(3) Instrument function options including four-wire resistive mode, immediate triggering, and automatic ranging.
(4) And (5) functional configuration.
(5) Judging whether the instrument executing process is correct or not, and when the instrument executing process is incorrect, popping up a dialog box to prompt an error.
(6) Problem processing, returning to the step (1).
(7) When the instrument performs correctly, the measurement data is read.
(8) And (5) temporary storage of data.
In practical application, the specific operation process is as follows:
first, the upper computer installs LabView software, and the function library of 34410A digital table is installed in the software.
And secondly, the upper computer completes handshake connection with the digital multimeter through an initialization function initialization.vi in the function library.
And thirdly, the upper computer completes four-wire resistance gear configuration of the digital multimeter through a measurement configuration function configuration measurement vi function in a function library.
And fourthly, the upper computer finishes reading four-wire resistance measured values through a data reading function read.vi in the function library.
And fifthly, the upper computer completes the operation of writing the test data into the test table through the VISA writing function in the VISA function library.
The first signal interface 18 to the sixth signal interface 33 in the dedicated interface box 14 specifically includes: the first signal interface 18 to the sixth signal interface 33 are unified with a compact, rectangular connector. The pin spacing is 2.54mm×2.54mm, and the quality grade is industrial grade. The connector has the advantages of long service life, high reliability, difficult oxidation of internal contacts and the like. The interface is fixed on the PCB.
The functions performed by the first to sixth signal interfaces 18 to 33 are as follows:
the signal transmission functions of the first interface switch, the second interface switch, the first tested product and the fourth tested product 32 in the test case 13 are completed; the third cable 3 to the eighth cable 8 are only required to be connected one by one according to the point numbers of the corresponding connectors, so that the operation is simple and convenient, and the cable reliability is high. The routing inside the special interface box 14 is completed through the first cable 1, the second cable 2 and the twelfth cable 12, and the connection relationship of the internal routing is shown in fig. 9. The internal cables are realized in the form of traces on a PCB on which the first to sixth signal interfaces 18 to 33 are fixed.
The four-wire resistive output port implementation is described in detail below: the four-wire resistor output port is a banana head socket which is uniformly used with the interface of the digital multimeter 34410A. The socket is fixed on a PCB, and has high reliability and stable signal transmission. And the four-wire resistor output port is used for completing the transfer and transmission function of the on-resistance signal of the tested product to the digital multimeter.
The first cable 1, the second cable 2, the twelfth cable 12 are wirings on the PCB board. Specifically, the PCB is a board made of FR4 material. After the manufacture and debugging are completed, the special interface box 14 is installed by screws through the positioning holes. The first interface switch is a sampling switch module or matrix switch module of at least 2-1 or more. The first interface switch has the function of completing the selection test of each knife of the double-knife relay; the second interface switch is a sampling switch module or matrix switch module of at least 32 select 1 or more. The second interface switch has the function of completing the selection test of each 1-path of the multi-channel relay of the tested product.
As one embodiment, as shown in fig. 7, the embodiment of the measured product measurement includes:
step 1: the specific embodiment of the first knife measurement of the product channel under test is as follows: the upper computer firstly controls the first channel of the first tested product to be closed through the eleventh cable 11, then controls the first channel of the second interface switch to be closed, then controls the first channel of the first interface switch to be closed, and completes four-wire resistance measurement of the first knife of the first channel; the upper computer controls the digital multimeter to read back four-wire resistance values through the tenth cable 10.
Step 2: the specific embodiment of the second knife measurement of the product channel under test is as follows: the upper computer firstly controls the first channel of the first tested product to be closed through the eleventh cable 11, then controls the first channel of the second interface switch to be closed, then controls the second channel of the first interface switch to be closed, and completes four-wire resistance measurement of the second knife of the first channel; the upper computer controls the digital multimeter to read back four-wire resistance values through the tenth cable 10.
Step 3: the other channels of the first product to be tested are implemented in the same manner as in step 1 and step 2.
Step 4: the second test product 30 through the fourth test product 32 are identical to the first test product in specific embodiments.
The embodiment of calculating the loop resistance of the test platform shown in fig. 9 includes:
the on-resistance mentioned in the invention takes the port of the first channel of the tested product as input, takes the port of the sampling common end of the tested product as output, and inputs the resistance value in the output loop. In addition, the loop resistance irrelevant to the on-resistance of the tested product is the loop resistance of the test platform. For example, the loop resistor with the sampling common terminal of the first interface switch as input and the channel port of the second interface switch as output is the loop resistor of the test platform.
The loop resistance of the test platform is the measurement error in the invention, and must be removed from the on-resistance test result. Therefore, before testing, the resistance value of each measurement loop must be calculated and written into the test program. In the use process of the relays of the first interface switch and the second interface switch, the measured loop resistance changes along with the time offset, so that the measured loop resistance needs to be updated every 1 year in order to ensure the accuracy of the on-resistance test result.
The following takes the resistance measurement of the test loop of the first channel of the first tested product as an example, specifically:
the manual testing method is adopted, the four-wire resistance measuring means takes the interface end of the first tested product of the fifth cable 5 as a first measuring point, namely a loop resistance measuring positive end, two knives of the relay are in short circuit, and the joint of the sampling public end of the first interface switch of the four-wire resistance output port is taken as a second measuring point, namely a sampling public end short circuit. Closing a first channel of a second interface switch, closing the first channel of the first interface switch, completing the measurement of the test loop resistance of a first knife of the first channel, and recording test data; closing a first channel of a second interface switch, closing a two channel of the first interface switch, completing measurement of a test loop resistance of a second knife of the first channel, and recording test data; the resistances of the test loops of the first knife and the second knife of the other channels of the first tested product are the same as the resistances of the test loops of the first knife and the second channel of the first channel; the measuring method of the resistance of the test loops of the second tested product 30, the third tested product 31 and the fourth tested product 32 is the same as that of the first tested product; and writing the resistance values of the test loops of the tested product into the test program respectively.
And the upper computer enters a program starting inlet by running the user interaction interface. Initializing a tested product to obtain a control handle of the tested product; initializing an interface switch to obtain a first interface switch and a second interface switch control handle; initializing a digital multi-purpose table to obtain a digital multi-purpose table control handle; initializing a data table and obtaining a data table control handle. The first interface switch channel Y is assigned an initial value of 1. The two knives are measured together, so the value of Y is 1 and 2 respectively in the whole test flow. Wherein, the detected product channel X is given an initial value of 1. In the whole test flow, the value of X is determined by the total number n of channels of the tested product.
The channel X of the tested product and the channel X of the second interface switch are closed, and the channel Y of the first interface switch is closed; and delaying for a certain time, and starting measurement after the measurement loop is stabilized. The digital multimeter reads the four-wire resistance value of the loop. The read-back of the resistance value is a subprogram, and aims to complete the transmission of test data from the digital multimeter to the upper computer program. Calculating a measured resistance, wherein the measured resistance is equal to the difference value between the measured value and the loop resistance value; after the calculation is finished, the data is temporarily stored. Judging whether the channel X of the tested product is finished or not, if not, returning to continue measurement, wherein X=X+1; and (5) until all the channel X values are tested, entering the next testing flow. Judging whether the test of the channel Y of the first interface switch is finished, if not, returning to continue the measurement, wherein Y=Y+1; and (5) until all the channel Y values are tested, entering the next testing flow. And the whole data table is stored with the file name of the user defined. Closing the tested product handle, closing the interface switch handle, closing the digital multipurpose table handle and closing the data table handle. Program execution ends.
In the specific embodiment of the resistor value read back VI, as shown in fig. 10, specifically includes:
1. entering a program entry to complete parameter selection. The instrument resource selects a USB port, and the port is configured into a baud rate 9600, a data bit 8, a stop bit 1 and a check-free bit.
2. And calling an initialization function (initialization.vi) of the digital table to complete instrument parameter configuration.
3. And after the parameter configuration is completed, entering instrument function selection. The digital meter mode selects a four-wire resistance mode, the triggering mode is immediate triggering, and the measuring range selects an automatic measuring range.
4. And calling a digital meter measurement configuration function (configuration measurement.vi) to complete instrument function configuration.
5. And judging whether the instrument configuration flow has errors or not. And judging whether the return value of the error code of the instrument is positive or negative. If the return value is smaller than zero, the instrument execution process is wrong, the program pops up a wrong prompt dialog box, and after the problem is solved, the test is carried out again. If the return value is greater than zero, then the program is executed correctly. A read measurement data flow is entered.
The relay sampling switch product on-resistance standardized testing device provided by the invention has the following advantages:
1. the invention can realize the on-resistance test of sampling switches of different connectors of the same manufacturer; for example, the different connectors include the following categories: d-connectors, euro-connectors, micro-rectangular connectors, etc.
2. The invention can realize the on-resistance test of sampling switches with the same connector and different wiring relations; for example, sampling switch products of the same connector, different wiring relationships, include the following categories: a first customized product, a second customized product, a third customized product, and the like.
3. The invention can realize the automatic switching of the on-resistance measurement of the two blades of the double-blade single-set relay; for example, when a single relay of a certain channel is closed, two blades of the relay are closed at the same time, and a test of one point can only make an on-resistance measurement of a certain blade; it is necessary to automatically switch to the measurement of one knife after the on-resistance test of the other knife is completed until the test is completed.
4. Compared with the prior improvement, the invention introduces a special interface box, realizes the standardization of the test of sampling switch products, has the characteristics of easy management, high efficiency, high reliability of tooling cables, accurate measurement precision and strong compatibility, and saves the working hours of products. The method specifically comprises the following steps:
(1) And after the test is finished, the test cable can be stored in a special interface box, so that the management is easy and the test cable is not easy to lose.
(2) The signal interfaces in the special interface box are all aerospace connectors, so that the special interface box is not easy to damage, convenient to plug and high in reliability.
(3) The products to be tested are different, but the test platforms are the same. The management difficulty of a large number of special test tools is effectively reduced, and the test efficiency is improved.
(4) The cable and the connector in the special interface box are processed by adopting the PCB, so that the special interface box is simple to manufacture, saves space and is convenient to operate.
(5) The cables of the test case and the special interface case adopt a double-connector one-to-one wiring mode, and the cable is simple and convenient to manufacture, reliable in connection and low in error rate.
(6) In the calculation process of the on-resistance, the error of the measuring loop is eliminated, and the error of the measuring loop is measured once a year, so that the accuracy of the test result is ensured to the greatest extent.
Example two
In order to realize the corresponding device of the first embodiment to achieve the corresponding functions and technical effects, a standardized test method for the on-resistance of the sampling switch product of the relay is provided below, as shown in fig. 11, and the test method includes:
step S1: acquiring an on-resistance value acquired by the digital multimeter; the on-resistance value is the series resistance value of the tested relay sampling switch product, the special interface box and the test box which are connected in series in the same circuit.
Step S2: acquiring a loop resistance value acquired by the digital multimeter; and the loop resistance value and the tested relay sampling switch product are connected in series with the series resistance value of the special interface box and the test box in the same circuit.
Step S3: and subtracting the loop resistance value from the on-resistance value to obtain the resistance value of the tested relay sampling switch product.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (10)
1. The device is characterized by comprising a digital multimeter, a special interface box, a test case and an upper computer;
the digital multimeter is connected with the upper computer; the digital multimeter is used for detecting the resistance of the tested relay sampling switch product and sending the detected resistance value to the upper computer;
The special interface box is respectively connected with the test case and the digital multimeter; the special interface box is used for converting the signal of the output port type of the test case into the signal of the set port type and transmitting the signal of the set port type to the detection end of the digital multimeter;
the test case is connected with the upper computer; the tested relay sampling switch product is placed in the test case; the test case is used for receiving a switch signal sent by the upper computer and connecting the resistor of the tested relay sampling switch product with a port on the special interface case according to the switch signal;
the upper computer is used for sending the switch signal to the test case, receiving a corresponding detected resistance value, and calculating the resistance value of the tested relay sampling switch product according to the corresponding detected resistance value.
2. The standardized testing device for on-resistance of a relay sampling switch product according to claim 1, wherein the digital multimeter is connected with the upper computer through a communication interface; the communication interface is a GPIB interface, an RS232 interface or a LAN interface.
3. The standardized testing device for on-resistance of a relay sampling switch product according to claim 1, wherein the digital multimeter detects the resistance of the relay sampling switch product to be tested by using a four-wire resistance measurement method.
4. The standardized testing device for on-resistance of a relay sampling switch product of claim 1, wherein the testing case comprises a first interface switch and a second interface switch; the special interface box comprises a first signal interface, a second signal interface, a tested product signal interface and a resistor output port; the resistor output port comprises a negative end interface and a positive end interface;
the negative end of the resistance measuring end of the digital multimeter is connected with the negative end interface of the resistance output port; the negative terminal interface is connected with a sampling public end of the first signal interface; the sampling public end of the first signal interface is connected with the sampling public end of the first interface switch; the channel interface end of the first interface switch is correspondingly connected with the channel interface end of the first signal interface; the channel interface end of the first signal interface is connected with the sampling public end of the second signal interface; the sampling public end of the second signal interface is connected with the sampling public end of the second interface switch; the channel interface end of the second interface switch is correspondingly connected with the channel interface end of the second signal interface; the channel interface end of the second signal interface is connected with the channel interface end of the tested product signal interface; the channel interface end of the signal interface of the tested product is connected with the channel interface end of the sampling switch product of the tested relay; the sampling public end of the tested relay sampling switch product is connected with the sampling public end of the tested product signal interface; the sampling public end of the tested product signal interface is connected with the positive end interface of the resistor output port; the positive end interface of the resistance output port is connected with the positive end of the resistance measuring end of the digital multimeter;
The first interface switch and the second interface switch are used for connecting the resistance of the corresponding relay sampling switch product to be tested with the digital multimeter according to the switch signal.
5. The standardized testing device for on-resistance of a relay sampling switch product of claim 4, wherein the first interface switch comprises a front-end sampling relay, a first front-end channel relay, and a second front-end channel relay; the second interface switch comprises a back-end sampling relay and a back-end channel relay;
the sampling public end of the first signal interface is connected with one end of the front-end sampling relay; the other end of the front-end sampling relay is connected with one end of the first front-end channel relay and one end of the second front-end channel relay respectively; the other end of the first front-end channel relay and the other end of the second front-end channel relay are correspondingly connected with the channel interface end of the first signal interface;
the sampling public end of the second signal interface is connected with one end of the rear end sampling relay of the second interface switch; the other end of the rear-end sampling relay is connected with one end of the rear-end channel relay; the other end of the back-end channel relay is correspondingly connected with the channel interface end of the second signal interface.
6. The standardized testing device for on-resistance of a relay sampling switch product according to claim 4, wherein the first interface switch is a sampling switch module or a matrix switch module; the second interface switch is a sampling switch module or a matrix switch module.
7. The standardized testing device for on-resistance of a relay sampling switch product of claim 5, wherein the front-end sampling relay, the first front-end channel relay, the second front-end channel relay, the back-end sampling relay, and the back-end channel relay are all double-pole single-position relays.
8. The standardized test device for on-resistance of a relay sampling switch product of claim 7 wherein one output contact in the other end of the first front-end channel relay is connected to one input contact in one end of the back-end sampling relay; one output contact in the other end of the second front-end channel relay is connected with the other input contact in one end of the back-end sampling relay.
9. The standardized testing device for on-resistance of a relay sampling switch product according to claim 1, wherein the interfaces of the special interface box are aviation round multi-core connectors or D-shaped multi-core connectors.
10. A standardized test method for on-resistance of a sampling switch product of a relay, which is applied to the standardized test device for on-resistance of a sampling switch product of a relay according to any one of claims 1 to 9, the test method comprising:
acquiring an on-resistance value acquired by a digital multimeter; the on-resistance value is the series resistance value of a tested relay sampling switch product, a special interface box and a test box which are connected in series in the same circuit;
acquiring a loop resistance value acquired by the digital multimeter; the loop resistance value and the tested relay sampling switch product are connected in series with the series resistance value of the special interface box and the test box in the same circuit;
and subtracting the loop resistance value from the on-resistance value to obtain the resistance value of the tested relay sampling switch product.
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| JPH06123751A (en) * | 1992-10-09 | 1994-05-06 | Advantest Corp | Connection test method for four-wire resistance measurement and four-wire resistance measuring unit capable of employing the method |
| CN102981056A (en) * | 2012-12-25 | 2013-03-20 | 北京航天测控技术有限公司 | Self-verification automatic test system, device and method for on-resistance |
| CN112798841A (en) * | 2020-12-29 | 2021-05-14 | 北京无线电计量测试研究所 | Full-automatic measuring device and method for digital multimeter |
| CN112816782A (en) * | 2020-12-29 | 2021-05-18 | 中国船舶重工集团有限公司第七一0研究所 | Device for measuring multichannel on-resistance and insulation resistance by four-wire system |
| CN214201694U (en) * | 2020-10-12 | 2021-09-14 | 珠海市运泰利自动化设备有限公司 | 64-channel relay voltage resistance measuring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH06123751A (en) * | 1992-10-09 | 1994-05-06 | Advantest Corp | Connection test method for four-wire resistance measurement and four-wire resistance measuring unit capable of employing the method |
| CN102981056A (en) * | 2012-12-25 | 2013-03-20 | 北京航天测控技术有限公司 | Self-verification automatic test system, device and method for on-resistance |
| CN214201694U (en) * | 2020-10-12 | 2021-09-14 | 珠海市运泰利自动化设备有限公司 | 64-channel relay voltage resistance measuring device |
| CN112798841A (en) * | 2020-12-29 | 2021-05-14 | 北京无线电计量测试研究所 | Full-automatic measuring device and method for digital multimeter |
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