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4.1 INTRODUCTION
This chapter contains information for keeping the equipment in good working order and
checking the overall performance. In case
please write or telephone your nearest representative, whose name and address can be found on
the label affixed to the inside front cover
Screw fasteners
Screw threads used are all metric, sizes M2, M3 and M4.
4.2 TESTING
To check that the instrument is working correctly the following simple tests may be
carried out.
Calibration
Join the RED and BLACK sockets in the front compartment to the CAL CHECK sockets,
using the electrode lead. Set zero and check that the dial reading is 40±0.25. If this is in error
because of a loose BALANCE knob, set zero by rotating the spindle and then secure the knob at
the position where the dial reading is 40. USE BOX SPANNER TO LOOSENrr1GHTEN NUT
(9 mm) UNDER KNOB CAP.
Continuity of leads, etc.
Connect the electrode and set zero. Put the electrode in position in the clamp, without the
ring. Short circuit the electrode rings
metal foil. The dial reading should
Leakage
Having checked continuity as above,
on the base by means
of the empty electrode ring.
Take the dial reading which
A high reading on the
can be located by
removing these parts individually
46882-171 D
Apr. 92
Chapter 4
MAINTENANCE
of trouble or for advice on servicing this instrument,
of the instrument.
with a piece of wire or close the clamp down on a piece of
be 60.
unscrew the clamp and secure the electrode down
should, ideally, be off scale below -6.
dial shows leakage which may be in the electrode or the leads. It
17
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