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Chapter II
Portable digital multimeter 21
When performing current measurements, never change of range, do not connect or
disconnect leads without first isolating the current. If you do, there is a risk of
generating surge currents which can blow the fuses or damage the instrument.
In TV repair work, or when carrying out measurements on power switching circuits,
remember that high amplitude voltage pulses at the test points can damage the
multimeter. Use of a TV filter will attenuate any such pulses.
Never perform resistance, condenser and diode measurements on live circuits.
1.1.3. Symbols
WARNING : Risk of danger.
Refer to the operating manual to
find out the nature of the potential
hazards and the action necessary
to avoid such hazards.
Selective sorting of waste for recycling
electric and electronic materials.
In accordance with the WEEE
2002/96/EC directive : must not be
treated as household waste.
Earth Dual insulation
DANGER :
Risk of electrical shock
Consult the manual.
1.1.4.
Opening the instrument
Before opening the instrument, always disconnect from all sources of electric current
and make sure not to be loaded with static electricity, which may destroy internal
components.
Fuses must be replaced with fuses of the same rating and type.
Any adjustment, maintenance or repair work carried out on the multimeter should be
carried out only by appropriately qualified personnel, after having taken into account
the instructions in this present manual. A "qualified person" is one who is familiar
with the installation, construction and operation of the equipment and the hazards
involved. He is trained and authorized to energize, de-energize circuits and
equipment in accordance with established practices.
If any faults or abnormalities are observed, take the instrument out of service and
ensure that it cannot be used until it has been checked out.
It is recommended to remove the battery from the instrument if not used.
1.2. Protection devices
ASYC II series instruments are fitted with various protection devices :
Varistor protection for limiting transients of over 1500 Vpk at the VΩ terminal, particularly
8 kV pulse streams as defined in French standard EN 61010-1 relative to safety.
A PTC (Positive Temperature Coefficient) resistor protects against overvoltages up to
600 V during resistance, capacitance and diode measurements. This protection is reset
automatically once overload is over.
Two fuses provide protection during measurements of intensity type.
Maximum protection : 600 V
IP protection rating of 67
6


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