Earth tester calibration is a vital process that ensures the accuracy and reliability of earth testers used for measuring earth resistance.
The first step in the calibration process is to check the earth tester for any physical damage or wear that may affect its accuracy. The technician will then connect the earth tester to a reference earth tester and perform a series of tests to determine its accuracy. These tests involve applying known resistances to the tester and comparing its readings to the reference tester. Any discrepancies between the readings will be recorded and used to adjust the earth tester if necessary.