In order to avoid electrical shock, the valid safe-
ty and VDE regulations regarding excessive
contact voltages must receive the utmost at-
tention when working with voltages exceeding
120V (60V) DC or 50V (25V)rms AC. The val-
ues in brackets are valid for limited ranges (for
example medicine and agriculture).
Measurements in dangerous proximity of elec-
trical installations are only to be executed when
instructed by a responsible electrical specialist,
and never alone.
If the operator’s safety is no longer guaranteed,
the instrument is to be put out of service and
protected against use. The safety can no longer
be guaranteed if the instrument (or leads):
• shows obvious damage
• does not carry out the desired measurements
• has been stored for too long under un-
favourable conditions
• has been subjected to mechanical stress dur-
ing transport.
Prior to usage, inspect the instrument and test
leads for external damage. Prior to any opera-
tion, ensure that connecting leads used and in-
struments are in perfect condition.
The test leads, the measurement accessories
and the mains plug may only be touched at the
handle section provided. Direct contact of me-
asurement ports or test probes must be avoi-
ded.
Avoid any heating up of the instrument by di-
rect sunlight to ensure perfect functioning and
long instrument life.
3.1 Appropriate Usage
The instrument may only be used under those
conditions and for those purposes for which it
was built.
When modifying or changing the instrument, the
operational safety is no longer guaranteed.
The opening of the instrument for fuse re-
placement, for example, may only be carried
out by professionals. Prior to opening, the in-
strument has to be switched off and discon-
nected from any voltages.
Any maintenance and calibration tasks may
only be carried out by our repair service staff.
The instrument may not be operated if the bat-
tery case is open.
If the instrument is subjected to an extremely
high electro-magnetic field, its functioning ab-
ility may be impaired.
6
Safety Measures
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