Operation
8
Fuse checking and Replacement
Resistance Circuit Fuse Check
1) Disconnect the test leads and set the rotary selector
switch to the ‘Ω’ position.
2) Press the ‘Test’ button and keep it pressed whilst turning
the generator handle (hand cranked models).
3) The reading obtained should be beyond full scale.
If the reading is approximately zero on the Resistance scale,
the 500 mA fuse has ruptured and should be replaced.
Insulation Circuit Fuse Check
1) Connect the test leads together and set the rotary
selector switch to a ‘MΩ’ position.
2) Press the ‘Test’ button and keep it pressed whilst turning
the generator handle (hand cranked models).
3) The reading obtained should be zero on the insulation
scale.
If the reading is ‘∞’ the 7 Amp fuse has ruptured and should
be replaced.
Fuse replacement
The fuses are held in a screw type holders situated in the
base of the instrument. Replace with fuses of the correct
size and rating (see Specification on page 10). To change a
fuse, use a screwdriver to release the centre part of the holder
containing the fuse
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