Working principle and debugging method of wristband online monitor
The wristband online monitor mainly monitors the working status of the wristband carried by the staff, and continuously monitors the wristband. It is mainly affected by the body's own body resistance and the static protection measures of the working environment (anti-static floor, anti-static work shoes, work clothes, table pads, chairs, etc.). Fine-tuning is adjusted to make it work normally.
The smallest measurement resistance of the wristband online monitor is 800K ± 10% ohm. The detection method is: adjust the fine-tuning of the online monitor to the * right end, connect the ground wire and power supply, the red light flashes, and accompanied by the alarm sound, use one end of the adjustable resistance tester to connect the ground wire, and the other end to the wrist With a jack connection, then slowly slide the adjuster so that its red light becomes green and the alarm sound disappears. The resistance value obtained at this time is the minimum range of the online monitor.
Wristband online monitor * The maximum measurement resistance is 2M. Without inserting the wrist strap, directly connect the ground wire and adjust the fine adjustment to the left. When the green light is displayed on the air, you can ignore it, because the body resistance impedance of the human body is about 1M, the impedance of the wrist strap is 1M ± 5%, other static The impedance brought by the measures will not be greater than 1M.
Under normal working conditions, the staff wears a wrist strap to adjust the trimming. When the trimming point changes from a red light to a green light, the adjustment is complete.
If there is a problem with this instrument, the fine adjustment will be out of control when adjusting the fine adjustment and will not work properly.