User manual

14 GMC-I Messtechnik GmbH
8 Maintenance
8.1 Housing
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.
8.2 Replacing the Fuse
Instructions on checking the zero point and
fuse are given in chapter 5.1.
Attention!
!
Disconnect the instrument from the
measuring circuit before removing
the fuse for replacement!
Eliminate the cause of the overload after the
fuse has blown before putting the instrument
back into service!
The fuse holder is situated between the
mains power cable and the probe connector
socket. The characteristic value of the fuse is
indicated on the front plate or in chapter 7.
Attention!
!
Please make absolutely sure that
only the specified fuse is inserted!
If fuses with other blowing character-
istics, other current ratings or other
breaking capacities are used, the op-
erator is placed in danger, and pro-
tective diodes, resistors and other
components may be damaged.
The use of mended fuses or short-circuiting
the fuse holder is prohibited.
The defective fuse can be disposed of with
the trash.
8.3 Recalibration
The respective measuring task and the
stress to which your measuring 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 frequently used in field
applications, combined with transport stress
and great temperature fluctuations, we rec-
ommend 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 calibra-
tion laboratory (DIN EN ISO/IEC 17025) the
deviations of your instrument in relation to
traceable standards are measured and doc-
umented. The deviations determined in the
process are used for correction of the read-
ings during subsequent application.
We are pleased to perform DAkkS or factory
calibrations for you in our calibration labora-
tory. Please visit our website at
www.gossenmetrawatt.com (→ Company
→ DAkkS Calibration Center or → FAQs →
Calibration questions and answers).
By having your measuring instrument cali-
brated regularly, you fulfill the requirements
of a quality management system per
DIN EN ISO 9001.
Standards DIN VDE 0701-0702 and
IEC 63353 (VDE 0751) stipulate that only mea-
suring instruments which are regularly tested
and calibrated may be used for testing.
* Verification of specifications or adjustment ser-
vices are not part of the calibration. For products
from our factory, however, any necessary ad-
justment is frequently performed and the obser-
vance of the relevant specification is confirmed.