Insulation Testers
Performance Tests
19
Test the Ohm Function
Earth Bond Resistance Accuracy Tests
To test earth bond resistance accuracy, complete the test steps in Ta b l e 9 , with this
procedure:
1. Connect the DUT
COM and Ω terminals to the Fluke 5320A low resistance output terminals
in a 2-wire configuration.
2. Set the Fluke 5320A to the low resistance source function (L).
3. Turn the DUT rotary function switch to the Ω function.
4. Apply the calibrator output listed in Ta bl e 9 , Steps 1-3. Prior to step 1, set the 5320A Ohms
output to Short and press the ZERO button on the DUT. Change the 5320A Ohms to 2-Wire
mode.
5. Press T and make sure that the DUT reads within the display reading limits shown in
Ta b l e 9 .
6. Connect the Fluke 5320A high resistance output terminals to the DUT COM and Ω
terminals.
7. Set the Fluke 5320A to the high resistance source function (H).
8. Press T and make sure that the reading is within the display reading limits for Ta b l e 9 ,
Step 4.
Table 9. Earth Bond Resistance Tests
Step Tester Range Applied Display Units
Display Reading
Low Limit High Limit
1 20.00 Ω 2.0 ΩΩ 1.94 2.06
2 2000 Ω 810.0 ΩΩ 795 825
3 2000 Ω 990.0 ΩΩ 972 1008
4 20.00 kΩ 18.0 kΩ kΩ 17.70 18.30
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