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What is the principle of the anti-static wrist strap tester

May 11, 2018

What is the principle of the anti-static wrist strap tester:


One drag and one alarm

The minimum measurement resistance of the anti-static wrist strap alarm is 800K±10% ohms. Detection method: adjust the fine-tuning of the online monitor to the right end, connect the ground wire and power supply, flash the red light, and accompanied by an alarm sound, connect the ground wire with the end of the adjustable resistance tester, and the other end with the wrist Connect with a jack, then slowly slide the regulator so that its red light turns green and the alarm sound disappears. At this time, the resistance value obtained is the minimum range of the online monitor.

One to two alarms

The maximum resistance of the anti-static wrist strap alarm is 2M. Do not insert the wrist strap, directly connected to the ground, adjust the fine adjustment to the left, do not consider when the green light is displayed, because the body's own body resistance resistance is about 1M, the wristband's impedance is 1M±5%, other static electricity Measures will not bring the impedance greater than 1M.

Under normal working conditions, the staff wears a wrist band to adjust the fine adjustment, and fine adjustment is performed when the red light turns into the critical point of the green light.

If there is a problem with this instrument, fine-tuning will become out of control when tuning fine-tuning and will not work properly.