Benning IT 100, Operating Manual, Page: 30 / 42

5.6 Insulating resistance measurement
Operation
5225 / 04/2022 en BENNING IT 100 30
NOTICE
Undetected inadmissible external voltage
The fuse of the device might blow because of an undetected inadmissible external voltage due
to the “LOCK” function being enabled.
• Make sure that the measuring point is free of voltage.
Figure 11: Insulating resistance measurement
Procedure
1. Set the desired testing voltage on the rotary switch of the device.
2. Connect the safety measuring lines to the device [ } page 25].
3. Bring the safety measuring lines into contact with the measuring points.
4. Press and hold the “TEST” key until the measured value and the actual testing voltage are
shown on the digital display.
– As long as you keep the “TEST” key pressed, the measurement is active and the
displayed measured value as well as the actual testing voltage may change.
– During an active measurement, “TEST” is shown on the digital display.
– The measured value will be displayed until a new test is started or another rotary switch
position is set.
– In case of four acoustic signals being emitted, the measurement was not successful and
the measurement has to be started again.
– Alternatively, you can also use the “LOCK” function [
}
page 21] .
5. Read the measured value on the digital display.
6. Please note the following before removing the safety measuring lines from the measuring
points: To discharge internal energy storages of the measuring circuit via the device,
release the “TEST” key before removing the safety measuring lines and wait until the testing
voltage has returned to 0 V.