7
PRELIMINARY CHECKS
Preliminary Performance Checks
The instrument will operate in any position, but best results are
achieved when the instrument is face up, on a firm level surface.
This is particularly true for hand cranked units to obtain a crank
speed of >180 rev/min.
1) If battery cells are fitted, switch to Battery Check range and
press the ‘Test‘ push button. Confirm that the pointer settles
within the battery symbol portion of the scale.
2) With the test leads disconnected, set the rotary selector switch
to the appropriate insulation range, press and hold down the
‘Test‘ button, (or turn the generator handle). The meter pointer
should move up the scale briefly and then return to the ‘ ‘
(infinity) position on the scale. This establishes that there is no
leakage through the instrument itself.
3) Check that the test leads and crocodile clips are in good order,
clean and with no broken or cracked insulation. Connect two of
the test leads to the ‘+’ and ‘-’ terminals and ensure that their
clips are not touching anything.
4) Press the ‘Test‘ button again (or turn the generator handle) and
observe the meter pointer. The pointer should rest over the ‘ ‘
position on the scale. If it does not, the test leads may be faulty
and should be inspected more closely for damage. Replace
them if necessary.
5) Connect the test lead clips together, press the ‘Test‘ button (or
turn the generator handle) and observe the meter pointer. The
meter should read ‘0 ‘. If it indicates infinity or a high resistance
value the leads may be open circuit and should be inspected
further. Replace them if necessary. (Shorting the leads together
and obtaining a ‘0 ‘ reading also indicates that the instrument is
working).
Battery Replacement
The cells are housed in a battery compartment in the base of the
instrument. To change the cells, use a screwdriver to remove the
battery cover securing screws and lift off the battery compartment
cover. Observing the correct polarity as marked on the battery
housing, install 8 replacement IEC LR6 (AA) cells. Replace and
secure the battery compartment cover on completion.
Warning
The battery contacts are not isolated from the
test leads. Remove the test leads from the
instrument before opening the battery compartment.
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