What is the difference between a human ground tester and a wrist strap tester?
The wrist strap tester detects whether the resistance of the wrist strap itself is qualified, and the human ground tester detects whether the resistance of the human body to the ground through the wrist strap is qualified, so the human ground tester tests the resistance of the human body + the resistance of the wrist strap.
Pay attention to the following matters to avoid damaging the instrument and causing confusion in use:
1) The tester itself must be reliably grounded: the static electricity generated by the human body may be introduced into the internal circuit board of the instrument through the fingers. If the tester is not grounded or the grounding is unqualified, the internal chip may be burned.
2) Keep the test button dry and free of pollutants, otherwise there is a risk of forming a short circuit
3) The resistance of anti-static shoes may change due to different weather temperature/humidity or pollution levels, sometimes qualified and sometimes unqualified. This is not a tester problem, but the resistance of the anti-static shoes itself.
How to calibrate the human body ground tester?
After the tester is installed, it is not easy to remove it, so it is not very convenient to send the instrument to a third party for calibration. It is recommended to buy the original standard resistance box, first calibrate whether the standard resistance box is qualified, and then use the qualified standard resistance box in the actual It is enough to calibrate the human body grounding tester at the location, which is a simple and efficient way.