阅读说明：本技术 一种基于接触电阻测量的同轴机电开关可靠性测试装置及方法 (Coaxial electromechanical switch reliability testing device and method based on contact resistance measurement ) 是由 谷帆 熊为华 于 2019-11-21 设计创作，主要内容包括：本发明属于开关测试技术领域,涉及一种同轴机电开关可靠性测试装置及方法。该装置包括：测量单元,用于测试同轴机电开关某一通路的电阻值；逻辑控制单元,通过控制信号实现同轴机电开关不同通路与所述测量单元的导通。本发明的测试方法为：逻辑控制单元通过控制信号使测量单元的开尔文四线法的四条引线接入同轴机电开关的某一通路；测量单元测试接入该通路的被测电阻阻值；通过异常阻值来甄别该通路是否能正常通断,评估其可靠性。本发明的装置及方法,基于比例法四线制接触电阻测量表征同轴机电开关主要电性能指标；四线制与通道选择结合,共用高电位施加线HS实现对前一测试通路不能正常关断的甄别,实现切换有效性的检测。(The invention belongs to the technical field of switch testing, and relates to a device and a method for testing the reliability of a coaxial electromechanical switch. The device includes: the measuring unit is used for testing the resistance value of a certain path of the coaxial electromechanical switch; and the logic control unit is used for realizing the conduction of different paths of the coaxial electromechanical switch and the measuring unit through a control signal. The test method comprises the following steps: the logic control unit enables four leads of a Kelvin four-wire method of the measuring unit to be connected into a certain channel of the coaxial electromechanical switch through a control signal; the measuring unit tests the resistance value of the tested resistor connected to the access; and judging whether the access can be normally switched on or off through the abnormal resistance value, and evaluating the reliability of the access. The device and the method of the invention represent the main electrical performance index of the coaxial electromechanical switch based on the measurement of the four-wire system contact resistance by a proportional method; the four-wire system is combined with channel selection, and the high potential application line HS is shared to realize discrimination that a previous test channel cannot be normally shut off, so that detection of switching effectiveness is realized.)

1. A coaxial electromechanical switch reliability testing device based on contact resistance measurement is characterized by comprising:

the measuring unit is used for testing the resistance value of a certain path of the coaxial electromechanical switch;

and the logic control unit is used for realizing the conduction of different paths of the coaxial electromechanical switch and the measuring unit through a control signal.

2. The device for testing the reliability of a coaxial electromechanical switch based on contact resistance measurement as claimed in claim 1, wherein the measuring unit comprises: the device comprises a voltage stabilizing chip, a standard resistor, a tested resistor and an AD conversion chip; the voltage stabilizing chip provides current for a standard resistor and a tested resistor which are connected in series, the voltage at two ends of the standard resistor is used as reference to be provided for a reference voltage pin of the AD conversion chip, and the voltage at two ends of the tested resistor is used as acquisition analog quantity to be input to a signal acquisition pin of the AD conversion chip; the high potential applying line, the low potential applying line and the collecting line at two ends of the tested resistor form four lead wires of the Kelvin four-wire method.

3. The device for testing the reliability of the coaxial electromechanical switch based on the contact resistance measurement as claimed in claim 2, wherein the logic control unit comprises a plurality of switch modules, the switch modules are used for selecting the measurement unit to be connected with different branch ports of the coaxial electromechanical switch, and the corresponding ports are connected with a common port, so as to realize the resistance measurement of different paths.

4. The device for testing the reliability of the coaxial electromechanical switch based on the contact resistance measurement as claimed in claim 3, wherein the switch module is connected between a branch port of the coaxial electromechanical switch and a high potential applying line and/or a high potential voltage collecting line; the common port is normally connected with the low potential applying line and the collecting line thereof.

5. The device for testing the reliability of the coaxial electromechanical switch based on the contact resistance measurement as claimed in claim 4, wherein the switch module is connected between a branch port of the coaxial electromechanical switch and a high-potential voltage acquisition line; the high potential applying line is normally communicated with a branch port of the coaxial electromechanical switch, and the common port is normally communicated with the low potential applying line and the collecting line thereof.

6. The device for testing the reliability of the coaxial electromechanical switch based on the contact resistance measurement as recited in claim 2, wherein the high potential applying line and the collecting line thereof are connected to the branch ports of the coaxial electromechanical switch through a coaxial cable, the low potential applying line and the collecting line thereof are connected to the common port of the coaxial electromechanical switch, and the logic control unit controls the conduction of different branch ports and the common port of the coaxial electromechanical switch to realize the resistance measurement of different paths.

7. The device for testing the reliability of the coaxial electromechanical switch based on the contact resistance measurement according to any one of claims 1 to 6, wherein the logic control unit comprises an MCU, and an IO output port of the MCU provides a control signal.

8. The device for testing the reliability of the coaxial electromechanical switch based on the contact resistance measurement as recited in claim 7, wherein the logic control unit comprises a power supply module, and the power supply module provides an operating voltage for the MCU and the tested coaxial electromechanical switch.

9. The device for testing the reliability of the coaxial electromechanical switch based on the contact resistance measurement as recited in claim 7, wherein the logic control unit further comprises a liquid crystal display module, and the liquid crystal display module is connected with the MCU and displays the measurement information.

10. The device for testing the reliability of the coaxial electromechanical switch based on the contact resistance measurement as recited in claim 7, wherein the MCU is connected to the industrial control computer via a serial port and controlled by the testing software of the upper computer.

11. The contact resistance measurement based coaxial electromechanical switch reliability testing device according to claim 7, wherein said MCU is connected to a key, said key providing a manual control function.

12. A coaxial electromechanical switch reliability testing method based on contact resistance measurement is characterized by comprising the following steps: the logic control unit enables four leads of a Kelvin four-wire method of the measuring unit to be connected into a certain channel of the coaxial electromechanical switch through a control signal; the measuring unit tests the resistance value of the tested resistor connected to the access; and judging whether the access can be normally switched on or off through the abnormal resistance value, and evaluating the reliability of the access.

Technical Field

The invention belongs to the technical field of switch testing, and relates to a device and a method for testing the reliability of a coaxial electromechanical switch.

Background

The coaxial electromechanical switch is widely applied to radio frequency microwave measuring instruments such as a vector network analyzer, a spectrum analyzer and the like, and can also be used in a system which needs to carry out channel topology on microwave radio frequency signals. The reliability of which has a decisive influence on the stable operation of the system. The prior advanced scheme is a device and a method for testing the service life of a coaxial electromechanical switch disclosed in Chinese patent '201610599647. X', the patent discloses a testing device consisting of a signal generation device, a signal detection device, a digital IO device and a data acquisition device and a corresponding testing method thereof, and the device realizes switch control, data acquisition and processing by upper computer software operated by an industrial control computer based on a signal path of the signal generation device, the signal detection device after passing through a tested piece and the voltage acquisition device.

The reliability of the whole process of a plurality of sets of switches can be automatically tested and recorded. Its advantages are automatic test of service life of switch, saving labour and real-time monitoring of switch switching effectiveness. Compared with an earlier test scheme, the method has the advantages that electrical performance is usually sampled and checked in the switching process, the on-off of a single path of the switch is manually controlled, and indexes such as insertion loss and the like are tested by using a vector network analyzer, so that the method has obvious innovativeness and advancement.

However, the above patent discloses a solution in which the linear range of the detector chip is required to be high, the unit price of the detector chip is required to be high, and the number of system requirements is also large. In addition, the digital IO equipment and the data acquisition equipment generally adopt corresponding USB or PCIE board cards, and are expensive. Therefore, the whole device has the defects of complex structure, higher cost and incapability of being separated from the independent use of the industrial control computer, and has certain resistance in the production test layout of a product line.

Disclosure of Invention

The invention provides a switch reliability testing device and method based on contact resistance measurement, aiming at the problems in the prior art, the device and method greatly reduce the cost and the device volume, have a program control mode and a manual independent working mode, and are more suitable for production testing of a product line.

The technical scheme adopted by the invention for solving the technical problems is as follows: a coaxial electromechanical switch reliability testing device based on contact resistance measurement, comprising:

the measuring unit is used for testing the resistance value of a certain path of the coaxial electromechanical switch;

and the logic control unit is used for realizing the conduction of different paths of the coaxial electromechanical switch and the test unit through control logic.

The measuring unit comprises: the measuring unit comprises: the device comprises a voltage stabilizing chip, a standard resistor, a tested resistor and an AD conversion chip; the voltage stabilizing chip provides current for a standard resistor and a tested resistor which are connected in series, the voltage at two ends of the standard resistor is used as reference to be provided for a reference voltage pin of the AD conversion chip, and the voltage at two ends of the tested resistor is used as acquisition analog quantity to be input to a signal acquisition pin of the AD conversion chip; the high potential applying line, the low potential applying line and the collecting line at two ends of the tested resistor form four lead wires of the Kelvin four-wire method.

As a preferred embodiment of the present invention, the logic control unit includes a plurality of switch modules, and the switch modules are used to select the test unit to be connected with different branch ports of the coaxial electromechanical switch, so as to implement resistance measurement of different paths.

The switch module is connected between the port of the coaxial electromechanical switch branch circuit and the high-potential applying line and/or the high-potential voltage collecting line; the common port is normally connected with the low potential applying line and the collecting line thereof.

As a further improvement of the invention, the switch module is connected between the branch port of the coaxial electromechanical switch and the acquisition line of the high potential voltage; the high potential applying line is normally communicated with a branch port of the coaxial electromechanical switch, and the common port is normally communicated with the low potential applying line and the collecting line thereof.

The high potential applying line and the collecting line thereof are connected with the port of the coaxial electromechanical switch through a coaxial cable, the low potential applying line and the collecting line thereof are connected with the common port of the coaxial electromechanical switch, and the logic control unit controls the conduction of different branch ports and the common port of the coaxial electromechanical switch to realize the resistance measurement of different paths.

The logic control unit comprises an MCU and a power supply module; an IO output port of the MCU provides a control signal; and the power supply module provides working voltage for the MCU and the tested coaxial electromechanical switch.

As a further improvement of the invention, the logic control unit further comprises a liquid crystal display module, and the liquid crystal display module is connected with the MCU and used for displaying the measurement information.

As a further improvement of the invention, the MCU is connected with the industrial control computer through a serial port and is controlled by upper computer testing software.

As a further improvement of the invention, the logic control unit further comprises a key, and the key is connected with the MCU and provides a manual control function.

The invention also provides a method for testing the reliability of the coaxial electromechanical switch based on contact resistance measurement, which comprises the following steps: the logic control unit enables four leads of a Kelvin four-wire method of the measuring unit to be connected into a certain channel of the coaxial electromechanical switch through a control signal; the measuring unit tests the resistance value of the tested resistor of the path; and judging whether the passage can be normally switched on or off through the abnormal resistance value, thereby evaluating the reliability of the passage.

Compared with the prior art, the device and the method for testing the reliability of the coaxial electromechanical switch based on contact resistance measurement have the following beneficial effects:

(1) the main electrical performance index of the coaxial electromechanical switch is represented based on the measurement of the four-wire system contact resistance by a proportional method.

(2) The device has the advantages of extremely low reliability testing device cost, simple structure, small volume, program control mode and manual independent working mode.

(3) The switch module with the optocoupler relay as the core forms a test access selection unit, so that the service life is long and the reliability is high.

(4) The four-wire system is combined with channel selection, and the high potential application line HS is shared to realize discrimination that a previous test channel cannot be normally shut off, so that detection of switching effectiveness is realized.

Drawings

FIG. 1 is a circuit diagram of a measurement unit according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the structure of a logic control unit according to embodiment 1;

FIG. 3 is a block diagram of a switch module;

FIG. 4 is a schematic diagram of the structure of a logic control unit according to embodiment 2;

fig. 5 is a schematic diagram of the structure of the logic control unit according to embodiment 3.

Detailed Description

In order to facilitate an understanding of the invention, the invention is described in more detail below with reference to the accompanying drawings and specific examples. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.