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Chapter II
18 Portable digital multimeter
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 count 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 equi
pment in accordance with established
practices.
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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