6. Insulation resistance
500
V
NOTE : IMPORTANT
The insulation test is protected by a live circuit warning. Detection of a voltage over 50 V will inhibit
testing. This applies whether or not the insulation test is locked on.
6.1 Making an INSULATION measurement
1. Set the left hand rotary range knob to the
500
V
insulation test voltage required:
2. Connect two test leads to the L1 (+ve ) and L2 (-ve) terminals on the instrument.
L1
L2
L3
N
E
3. To start test, press and hold either of the TEST buttons, or , on the instrument.
Release the test button after the displayed reading has settled. The circuit will now discharge safely.
NOTE : A 1000 V warning is displayed whenever the 1000 V range is selected for the first time and the TEST
button is pressed.
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MFT1800 series
24
Insulation resistance
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