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13 Maintenance
Routine maintenance is limited to re-calibration, resetting and cleaning. The only repair
maintenance that can be carried out by the user is current range fuse replacement.
13.1
Calibration
13.1.1
Zero Calibration
If the meter has been stored at a temperature outside the specified operating range, and is switched
on before it has fully acclimatised to the working environment, meter accuracy may be affected as
the meter’s temperature changes. To ensure optimum accuracy the zero calibration can be
repeated when the meter has acclimatised, see
section 7.7
.
13.1.2
Routine Calibration
Calibration is guaranteed as in the specification. The Manufacturers provide a re-calibration
service, as do most of their agents overseas. Where owners wish to carry out re-calibration
themselves, this should only be done by skilled personnel with access to precision equipment
working in conjunction with the Service Guide.
13.2
Hard Reset
If the multimeter gets into a condition in which normal operation is not possible, it can be
returned to normal operation by reloading the Factory Default settings – see
section 12.8
.
However, if it “locks up” (i.e. will not respond to key presses), it can be put through a Hard
Reset. A Hard Reset is performed by holding down both the
[Cancel]
and
[Stop]
keys together
for five seconds. This will reset the multimeter but will not return the factory default settings.
Note that if the multimeter is running off its internal batteries then a Hard Reset will cause the
multi-meter to power down; to turn the multimeter back on simply press the
Operate
key.
13.3
Fuse Replacement
13.3.1
Current Range Fuses
The
mA
/
1A
socket is protected by a 1.6A (F) 1kV HRC fuse and the
10A
socket by a 10A (F) 1kV
HRC fuse, accessed via the fuse door in the base of the case. To replace a fuse, proceed as
follows:
1.
Disconnect the instrument from all voltage sources.
2.
Remove the screw retaining the cover.
3.
Replace the fuse with one of identical specification and size.
4.
Refit the fuse door securely.
