1652C/1653B/1654B
Users Manual
20
Measuring Insulation Resistance
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Figure 9. Insulation Resistance Display/Switch and Terminal Settings
Warning
To avoid electric shock, measurements should only be performed
on de-energized circuits.
To measure insulation resistance:
1. Turn the rotary switch to the R
ISO
position.
2. Use the L and PE (red and green) terminals for this test.
3. Use the to select the test voltage. Most insulation testing is performed
at 500 V, but observe local test requirements.
4. Press and hold until the reading settles and the tester beeps.
Note
Testing is inhibited if voltage is detected in the line.
• The primary (upper) display shows the insulation resistance.
• The secondary (lower) display shows the actual test voltage.
Note
For normal insulation with high resistance, the actual test voltage (U
N
)
should always be equal to or higher than the programmed voltage. If
insulation resistance is bad, the test voltage is automatically reduced
to limit the test current to safe ranges.
Extended Documentation Mode
In the Extended Documentation mode, the Tester stores the measurement
result with the measurement location: P/P, P/N, P/E or N/E. You can select the
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