Electrical Installation Tester
Making Measurements
21
Measuring Insulation Resistance
.
R
ISO
apx005f.eps
Figure 8. Insulation Resistance Display/Switch and
Terminal Settings
XW Warning
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 4 to select the test voltage. Most insulation
testing is performed at 500 V, but observe local test
requirements.
4. Press and hold T until the reading settles and the
tester beeps. For most tests you will want to use the
probe with the remote control T button.
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.
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