Insulation Multimeters
Performance Test
25
Insulation Resistance Accuracy Test
To test the Insulation Resistance accuracy, sequentially complete the test steps
in Table 4, using the following procedure.
1. Connect the INSULATION output terminals on the UUT to the calibrator.
2. Set the calibrator to the Insulation Resistance Test Mode.
3. Turn the rotary switch to INSULATION.
4. Set the voltage range on the UUT; see Table 4.
5. Apply the Calibrator Output to the UUT; see Table 4.
6. Press on the UUT.
7. Verify that the display reading is within the limits given in Table 4.
Table 4. Insulation Resistance Accuracy Test
Step
UUT
Voltage
Range
Calibrator
Resistance
Range
Calibrator
Output
UUT Display Reading
Limit Low Limit High
1 500 V 60.0 MΩ 0.500
MΩ
0.0 1.0
2 500 V 500 MΩ 450 MΩ 438 462
3 500 V 500 MΩ 600 MΩ >550 >550
4 1000 V 2.0 GΩ 1.7 GΩ 1.2 2.2
5 1000 V 600 MΩ 600 MΩ 586 614
1587 FC/1587 Only
6 1000 V 60.0 MΩ 1 MΩ 0.5 1.5
7 50 V 6.00 MΩ 100 kΩ 0.05 0.15
8 50 V 50.0 MΩ 45 MΩ 43.1 46.9
9 100 V 6.00 MΩ 100 kΩ 0.05 0.15
10 100 V 100 MΩ 95 MΩ 87 103
11 250 V 60.0 MΩ 250 kΩ 0.0 0.8
12 250 V 250 MΩ 225 MΩ 217 233
Insulation Function, External Sense
The following test verifies that the UUT will sense a voltage >30 V when present
on the circuit under test.
1. Connect the UUT INSULATION output terminals to the calibrator voltage
output terminals.
2. Turn the rotary switch to the INSULATION function.
3. Apply 35 V, 50 Hz to the UUT.
4. Verify that the UUT displays >30 V in the primary display.
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