Fluke 150 Series - I Nominal Test Procedure

Insulation Testers
Performance Tests
23
3. Using the previously determined Meter Voltage Reading Error %, calculate the
actual open circuit output voltage for each voltage range. Verify that the
calculated value is within the limits shown in Table 6. The formula is UUT
Recorded Reading x UUT Voltage Reading Error % + Recorded UUT Display
Reading.
Table 6. Source Voltage Accuracy Test, Open Circuit
Step Function Range
Recorded UUT
Display Readings
Calculated UUT Output
Voltage Limits
1. Insulation 1000 V 1000 V to 1200 V
2. Insulation 500 V 500 V to 600 V
3.
Insulation
(1507/1508)
250 V 250 V to 300 V
4.
Insulation
(1507/1508)
100 V 100 V to 120 V
5.
Insulation
(1507/1508)
50 V 50 V to 60 V
I Nominal Test:
The following test verifies the UUT’s ability to maintain the nominal insulation test
current while loaded.
1. Connect the DMM and Calibrator to the UUT
INSULATION and COM terminals
as shown in Figure 8.
2. Set the calibrator to an insulation resistance test function.
3. Set the calibrator for the insulation resistance called out in Table 7 for Steps 1-4.
4. Set the DMM function switch to µADC.
5. Press the T key and verify that the DMM display reading is
> 1000.0 µA for steps 1-4.
6. Disconnect the calibrator and replace it with a separate 50-kΩ resistor.
7. Set the UUT to the 50 V range and press the T key. Verify that the DMM
display reading is > 1000.0 µA for step 5.
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