I have a Seaward PAT SERIES CHEKC BOX to check our pat testers between calibration.
We have a battery operated pat tester Seaward Primtest and 3 Metrel mi 3304 betatest plus testers.
The nominal values on my checkbox are
earth bond T2 0.523
Insulation test (class 1) 1.97
Earth leakage 0.61
These are my results
Seaward prime test Metrel (1) Metrel(2) Metrel (3)
Earth bond 0.5 1 0.5 0 0.52 0.54
Insulation 1.98 1.98 1.98 1.98
Earth leakage 0.36 0.49 0.71 0.71
As you can see the earth leakage is al over the place . Can anyone explain why these figures are not within the checkbox spec?