The working principle of the multi-function wrist strap online tester

MultifunctionWrist strap online testerIt is a device for detecting the resistance value of the anti-static wrist strap. It is composed of single-chip microcomputer control circuit, three kinds of electrostatic electrification devices of high-voltage power supply, non-contact electrostatic potential sensor, signal amplification circuit, data acquisition circuit, keyboard input and LED display output. Here is a brief introduction to the working principle of the multifunctional wrist strap online tester.

The control circuit of the measuring device of the multi-function wrist strap online tester is based on the single-chip microcomputer as the core component. The single-chip microcomputer controls the high-voltage source, the charging capacity and the corona power distribution device as a standard for the input of the initial value through the keyboard. After the tested sample is charged to a certain potential, pressing the test key will control the mechanical equipment to turn off the high-voltage source and ground the sample, and at the same time start the A/D converter. Then use the non-contact electrostatic sensor of the multifunctional wrist strap on-line tester to directly contact the tested sample, and the electrostatic potential obtained by the three charging methods will amplify and filter the electrostatic attenuation signal on the tested material, and then convert it into The digital signal that the single-chip microcomputer can recognize is sent to the single-chip terminal. The single-chip computer cooperates with the corresponding program to compare the received signal with the parameters input by the keyboard, so that the control logic unit can judge and control the closing of the timing. The LED displays the measured static decay time, thereby realizing the function of a multifunctional wrist strap online tester.

The multifunctional wrist strap online tester mainly uses non-contact electrostatic measurement technology and single-chip microcomputer technology, and realizes accurate measurement of the decay time of static electricity from a set starting potential to another potential through the design of a single-chip language program. The multi-function wrist strap online tester can simulate the three main electrostatic charging methods of charging method, corona spray method and friction method. It can complete the electrostatic test of the anti-static wrist strap in complex environments to ensure the normal use of the wrist strap. .