1672/1673 FC/1674 FC
Users Manual
30
Insulation Resistance Measurement
XW Warning
To prevent electric shock, measurements should only be done on de-energized
circuits.
This measurement determines the insulation resistance (R
iso
) between the selected line pair.
No external voltage may be present on this line-pair to perform the test.
This measurement mode has various settings to adjust. The options are changing the line pair,
enabling pretest, and test voltage adjustment.
To measure insulation resistance:
1. Select the R
ISO
mode. See Figure 9.
2. Select the input.
3. Turn on or turn off the Safety Pretest.
4. Select the test voltage.
The selected test voltage also sets the measurement range and resolution.
5. To start the test, tap
H.
If voltage is detected on the line pair the test will not start and this message shows on the
display:
W Voltage detected. Cannot start test.
During the test the voltage level is visible in the terminal diagram as a reminder that high
voltage is on the lead terminals. The Tester inhibits the test if the detected terminal voltage is
>30 V ac/dc before the test starts. The beeper plays a negative sound if this voltage is present.
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