LD Didactic 531 902 Instructions For Use Manual

03/16-W07-Sel
1 Description
The demo multimeter is an overload-protected electronic
pointer measuring instrument for DC currents and voltages,
sinusoidal alternating currents and voltages, and resistances
With its superior large scale panel and the function and
operating mode switches on the front and rear, it is particularly
well suited for demonstration experiments. The measured
values are displayed directly on six switchable scales in 1–3
gradation with the zero point left or on a scale with the zero
point in the centre.
Safety Instructions
The demo multimeter complies with the safety conditions for
electrical measurement, control, and laboratory devices
outlined by DIN EN 61010 part 1 and is designed in
compliance with protection Class II. It is meant to be
operated in dry rooms suitable for the use of electrical
equipment and facilities.
To ensure the safety of the user and to protect the device,
the demo multimeter is equipped with an automatic socket
lock. It is coupled to the function switch and only unlocks the
sockets required for the selected function. It also blocks
switching to non-permitted functions when the test leads are
plugged in.
Safe operation of the demo multimeter is ensured if it is used
as intended. Safety is not ensured, however, if the demo
multimeter is handled incorrectly (e.g. overloaded beyond the
permissible maximum) or carelessly. If it can be assumed
that the device can no longer be operated safely, the device
should immediately be taken out of commission (e.g. if there
is visible damage to the device)
 Before operating the demo multimeter, inspect the case,
controls, and indicators for damage. In the event of mal-
functions or visible damage, take the demo multimeter out
of operation and secure it against unintentional operation.
Instructions for Use 531 902
Demo Multimeter, active (531 902)
The current measuring range is from 1 A to 30 A, the voltage
measuring range from 1 mV to 10 kV, and the resistance
measuring range from 1 k to 300 k. Using the current clamp
(531 901), the current measurement ranges can be extended
up to 300 A for direct current and 200 A for alternating current.
Using the high-voltage probe (531 93) the voltage measuring
ranges can be extended to 300 kV for DC voltages that are not
hazardous.
 Do not measure hazardous voltages above 500 V that
cause electric shocks and measure currents above 2 mA
DC only at voltages up to 500 V.
There is contact hazard if, at voltages higher than safety
extra-low voltages, the following thresholds are exceeded:
2 mA direct current or 0.5 mA alternating current (RMS
value) for the current through a non-inductive resistance of
2 k or 45 As for the charge at voltages up to 15 kV, and
350 mJ for stored energy at voltages above 15 kV.
Safety extra-low voltages are voltages below 60 V DC or
30 V RMS.
 Do not exceed the maximum voltage of 500 V between
any of the sockets and ground.
 Only use measuring leads in perfect condition and use
safety connecting leads (500 600 and following) to meas-
ure voltages higher than safety extra-low voltages.
 Do not carry out any adjustment, maintenance, or repair
work on the open device while it is connected to power, or
have such work carried out by a specialist who is familiar
with the dangers involved.