How a touch tester works?
A touch tester is typically a box which is powered from the mains through a low voltage power pack. The local earth (green/green-yellow) is taken from the mains outlet and passed onto a wrist strap banana socket. The wrist strap grounding cord to be tested is plugged into the banana socket whilst is attached to the wrist of the wearer. When the wearer touches a plate provided on top of the meter with the wrist strap on, a measurement of resistance in the loop is made by the meter, if the resistance found is in the range of 800KΩ to 8MΩ then the test of the wrist strap passes, if out of this range then an alarm is produced.
