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Such voltage might cause a life-dangerous electrical shock when elec-
trical conductors are touched.
First switch off voltage source, connect the measuring unit with the
terminals of the voltage source to be measured, set the measuring
unit to the necessary voltage range and afterwards switch on voltage
source.
After measurement has been finished, switch off the voltage source
and remove the measuring cables from the terminals of the voltage
source.
• Make sure before each voltage measurement the unit is not set to the
amperage range.
• Before changing the measuring range remove the probe tips from the
object to be measured.
• Control before each measurement the measuring unit and your test
leads to make sure they are not damaged.
• Do not use this measuring unit in environments or rooms with adver-
se environmental conditions where flammable gases, steams or dusts
exist or may exist. For your own safety avoid under all circumstances
that the measuring unit or the test leads become damp or wet.
Avoid the usage near
a) strong magnetic fields (loudspeakers, magnets)
b) electromagnetic fields (transformers, motors, coils, relays, contac-
tors, electromagnets etc. )
c) electrostatic fields (charge/discharge).
d) transmission antennas or hf-generators
• For measurement use only those test leads which are supplied with
the measuring unit. Only these are admissible.
• To avoid an electrical shock, don’t touch directly or indirectly the test
probes and the test points during measurement.
• To avoid serious electrical shock and/or instrument damage do not
apply more than 500 VDC/VACrms between any terminal of the mea-
suring unit and the earth ground.
4
to IEC 664. The unit and the measuring cables are not protected
against arcing (IEC 1010-2-031, section 13.101).
• Keep children away from measuring units!
• Pay attention to the rules for prevention of accidents in industrial
enterprises prescibed by the Industrial Trade Associations for Electrical
Installations and Production Facilities.
• When using the unit in schools and hobby-workshops the usage and
the measurement has to be controlled by the responsible teachers or
skilled personell.
• If covers are opened or parts are removed, except it is possible with-
out tools, voltage-carrying components may be accessable. Terminals
can also carry voltage. If it is necessary to open the unit before adjust-
ment, maintenance, repairing or exchange of parts or modules, the
measuring unit has to be separated from all voltage sources and mea-
suring circuits. Repairs or maintenance to the measuring unit must
only be carried out by qualified service personell or qualified electrici-
ans who know the dangers and the respective rules (VDE 0100, VDE-
0701, VDE-0683).
• Capacitors in the unit can still carry voltage, even if the unit has been
separated from all voltage sources.
• Please make sure to use new fuses of the proper rating. Do not use
repaired fuses and do not bridge the fuse holders.
To replace the fuse separate the measuring unit from the measuring
circuit, remove any input signal and switch it off. Remove all connec-
ted cables and probe tips. Use a suitable crosspoint screw driver
carefully open the case. Remove the defective fuse(s) and replace it
with a new one of the same type and nominal current 0.8 A quick blow,
250 V; usual name: F 0.8 A/250 V or F 800 mA/250V. For the amperage
range 20 A ultra rapid, 250 V; usual name: FF 20 A/250 V (BUSS ABC20).
After the fuse has been exchanged close the cabinet. Do not operate
the unit before it has been closed and screwed safely.
• Use special caution when working with voltage above 25 V (AC) and
above 35 V (DC).
