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34 GMC-I Messtechnik GmbH
Maintenance – Calibration
7 Maintenance and Calibration
7.1 Housing Maintenance
No special maintenance is required for the housing. Keep outside
surfaces clean. Use a slightly dampened cloth for cleaning. Avoid
the use of cleansers, abrasives or solvents.
7.2 Replacing the Fuses
All fuses are accessible from the outside.
If a fuse should blow, eliminate the cause of overload before
placing the instrument back into service!
Attention!
!
Disconnect the instrument from the measuring circuit before
removing the fuse!
Attention!
!
Use specified fuses only!
If fuses with other blowing characteristics, other current
ratings or other breaking capacities are used, the operator
is placed in danger, and protective diodes, resistors and
other components may be damaged.
The use of repaired fuses or short-circuiting the fuse holder
is prohibited.
7.3 Recalibration
The respective measuring task and the stress to which your mea-
suring instrument is subjected affect the ageing of the compo-
nents and may result in deviations from the guaranteed accuracy.
If high measuring accuracy is required and the instrument is fre-
quently used in field applications, combined with transport stress
and great temperature fluctuations, we recommend a relatively
short calibration interval of 1 year. If your measuring instrument is
mainly used in the laboratory and indoors without being exposed
to any major climatic or mechanical stress, a calibration interval of
2-3 years is usually sufficient.
During recalibration* in an accredited calibration laboratory
(DIN EN ISO/IEC 17025) the deviations of your instrument in rela-
tion to traceable standards are measured and documented. The
deviations determined in the process are used for correction of
the readings during subsequent application.
We are pleased to perform DAkkS or factory calibrations for you in
our calibration laboratory. Please visit our website at
www.gossenmetrawatt.com ( Services DAkkS Calibration
Center or FAQs Calibration questions and answers).
By having your measuring instrument calibrated regularly, you ful-
fill the requirements of a quality management system per
DIN EN ISO 9001.
Standards DIN VDE 0701-0702 and IEC 63353 (VDE 0751) stipu-
late that only measuring instruments which are regularly tested
and calibrated may be used for testing.
* Verification of specifications or adjustment services are not part of the
calibration. For products from our factory, however, any necessary ad-
justment is frequently performed and the observance of the relevant
specification is confirmed.
34


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