User Manual

GMC-I Messtechnik GmbH 9
6 Maintenance
6.1 Device Power Supply
Caution: Dangerous Voltage!
Dangerous voltage in battery compartment!
Disconnect the test probes from the device under test and
switch the instrument off before removing the battery com-
partment lid.
The instrument may not be placed into service if the battery
compartment lid has not been inserted and secured with
the screws.
Either alkaline batteries or rechargeable NiCD/NiMH batteries may
be used to supply the instrument with electrical power (4 each,
size: AAA, type: LR03).
The battery charge level is continuously displayed (see section 3.2
on page 4).
If too little voltage is indicated, replace the batteries.
Note
We recommend removing the batteries during lengthy
periods of non-use (e.g. vacation). This prevents exces-
sive battery depletion or leakage, which may result in
damage to the instrument under unfavorable conditions.
6.1.1 Inserting and Replacing the Batteries
Loosen the two screws at the back of the instrument and remove
the battery compartment lid. Insert the batteries assuring correct
polarity!
Figure 6.1: Correct Battery Polarity
Always replace all 4 batteries at once, and use high quality batter-
ies. Replace the battery compartment lid and retighten the
screws.
6.1.2 Recharging the Batteries
Attention!
!
Use only the charger (Z507A) which is offered as an op-
tional accessory for this instrument to charge the batter-
ies inserted in the instrument.
Make sure that the following conditions have been fulfilled be-
fore connecting the charger to the charging socket:
– rechargeable batteries have been inserted with correct
polarity, no normal batteries
– The test instrument has been disconnected from the
measuring circuit at all poles
– The instrument must remain off during charging.
Recharging of the batteries begins as soon as the charger is con-
nected to the mains and to the charging socket (see figure 6.1).
Charging takes 5 hours and 30 minutes (integrated safety timer) if
the batteries have been fully depleted.
Safety Precautions
• Do not attempt to recharge alkaline batteries: they may leak,
explode etc. The test instrument may be severely damaged or
destroyed as a result.
• After initially charging new batteries and after rechargeable
batteries have not been used for a lengthy period of time (sev-
eral months), operating hours after charging may be signifi-
cantly less than usual. If this is the case, repeat the charging
procedure several times.
Autonomous, intelligent charging stations execute charging/
discharging cycles of this sort automatically (see instructions
included with the charging station). This procedure increases
the capacity of the batteries, thus making longer periods of
operation possible between charging cycles.
• If no improvement is achieved in this way, one or more of the
rechargeable batteries may no longer fulfill the original specifi-
cations. If this is the case, the defective rechargeable battery
should be identified, e.g. with the help of the voltage measure-
ment, and replaced.
• Battery capacity is gradually reduced as a result of long and
frequent use. When you notice that this is the case, all of the
rechargeable batteries should be replaced.
6.1.3 Replacing the Fuse
Attention!
!
The fuse may only be replaced with the fuse type speci-
fied in section “Technical Data” . If any other fuse is in-
serted, this may result in damage to the instrument and/
or danger for the user!
6.2 Cleaning
Use a soft cloth and soapy water for cleaning. Do not place the
test instrument back into service until its surface is completely dry.
Attention!
!
Do not use cleaning agents which contain benzine or al-
cohol! Prevent liquids from penetrating into the test in-
strument’s interior.
6.3 Recalibration
The measuring tasks performed with your instrument, and the
stressing it’s subjected to, influence aging of its components and
may result in deviation from the specified levels of accuracy.
In the case of strict measuring accuracy requirements, as well as
in the event of use at construction sites with frequent stress due
to transport and considerable temperature fluctuation, we recom-
mend a relatively short calibration interval of once per year. If your
instrument is used primarily in the laboratory and indoors without
considerable climatic or mechanical stressing, a calibration inter-
val of once every 2 to 3 years is sufficient as a rule.
During recalibration* at an accredited calibration laboratory
(DIN EN ISO/IEC 17025), deviations from traceable standards
demonstrated by your measuring instrument are documented.
Ascertained deviations are used to correct displayed values dur-
ing later use of the instrument.
We would be happy to perform DAkkS or factory calibration for
you at our calibration laboratory. Further information is available at
our website:
www.gossenmetrawatt.com ( Company  DAkkS Calibration
Center or  FAQs  General – Calibration Questions and
Answers ).
*
Examination of the specification, as well as adjustment, are not included in calibra-
tion. However, in the case of our own products, any required adjustment is per-
formed and adherence to the specification is confirmed.