10/98-V5-Sel-
Instruction sheet 531 900
Demo Multimeter (531 900)
O
0
-5
-10
5 1
0
FF
531 900
V
V
OFF
mV
kV
µA
A
kΩ
mA
kΩ
0
A
1
A
mV mA
A
300V µA
kΩ
30A
kV
1000V CAT II
Description
The demo multimeter is an overload-protected electronic pointer meter for measuring DC currents and voltages, sinusoidal
AC currents and voltages and resistances. Thanks to the large
scale positioned high on the meter, and the function and mode
switches on both the front and the rear of the device, the demo
multimeter is ideal for demonstration experiments. The measured values are displayed directly on any of six switchable scales
graduated from 1 to 3 and zero point left, or on one scale with
zero point middle.
Current can be measured in the range from 1 µA to 30 A, voltage in the range from 1 mV to 10 kV and resistance in the range
from 1 kΩ to 300 kΩ. The additionally available clip-on ammeter
(531 901) can be used to measure currents of up to 300 A DC or
200 A AC, and the high tension probe (531 93) permits measurement of non-hazardous contact voltages up to 300 kV.
Safety notes
The demo multimeter complies with all safety requirements
for electrical equipment for measurement, control and laboratory use (EN 61010 Part 1) and is constructed according to
protection class II. It is designed for use in dry rooms which
are suitable for the operation of electrical installations and
equipment.
The demo multimeter is equipped with a special patented sokket inhibitor mechanism to ensure user safety and protect the
measuring instrument. It is coupled with the function switch
and enables only those sockets which are required for the selected function. It also prevents switching to impermissible
functions while leads are connected.
Operational safety of the demo multimeter is ensured when
the device is used as intended. However, safety cannot be
guaranteed when the demo multimeter is operated improperly
(e.g. subjected to overloads greater than the maximum permissible level) or handled carelessly. Whenever there are
grounds for assuming that safe operation may no longer be
possible (e.g. when the device is visibly damaged), shut off
the device immediately .
• Before putting the demo multimeter into operation, always
inspect the housing and the control and display elements for
visible damage. In the event of malfunctions or visible damage, shut off the demo multimeter and make sure that it
cannot be activated inadvertently.
• Do not attempt to measure any dangerous contact voltages
greater than 1000 V, and only measure currents greater than
2 mA DC at voltages of less than 1000 V.
A contact hazard exists when the following values occur for
voltages higher than safety extra-low voltage: 2 mA DC resp.
0.5 mA AC (RMS) for the current through an induction-free
resistor of 2 kΩ or 45 µAs when charging at voltages up to
15 kV and 350 mJ for the stored energy at voltages above
15 kV.
Safety extra-low voltage comprises voltages below 60 V DC
or 30 V RMS.
• Do not exceed the maximum voltage of 1000 V between any
socket and ground.
• Use only measuring leads which are free of defects; use
safety connecting leads (500 600 ff) when measuring voltages greater than safety extra-low voltages.
• Always disconnect the demo multimeter from the measuring
circuit before inserting the battery.
• Never carry out adjustment, maintenance or repair work on
the open meter while a voltage is connected to the device;
such tasks may only be carried out by a qualified technician
who is familiar with the dangers involved.
page 2/6
Instruction sheet 531 900
3
Technical data
System:
Accuracy:
0
-5
-10
1
2
Operating position:
Curve form of
measurement quantity:
Frequency range:
5 1
0
F
OF
531 900
V
3
V
4
5
OFF
mV
kV
µA
A
kΩ
mA
6
7
kΩ
0
A
8
A
mV mA
A
300V µA
kΩ
30A
kV
Large display (front):
Length of scale arch:
Height of numerals:
Scales:
1000V CAT II
13
9
-0-
10
11
III II IIIII IIIIIIII IIII IIIIIII II IIIII IIIIIIII IIII IIIIIII II IIIII
IIIIIIII IIII IIIIIII II IIIII IIIIIIII IIII IIIIIII II IIIII IIIIIIII IIII
IIIIIII II IIIII IIIIIIII IIII IIIIIII II IIIII IIIIIIII IIII IIIIIII II IIIII
OFF
6
kΩ
III II IIIII
IIIIIIII IIII
mV
IIIIIII II IIIII
IIIIIIII IIII
IIIIIII II IIIII A
IIIIIIII IIII
IIIIIII II IIIII
kΩ
IIIIIIII IIII
V
kV
µA
4
mA
A
12
Scale graduation:
Scale markings:
Small display (rear):
Length of scale arch:
Height of numerals:
Scales:
Scale graduation:
Scale markings:
Insulation:
Insulation:
1 Large display, with 7 scales
2 Scale wheel
Max. permissible voltage
of all sockets w.r.t. ground
Moving-coil mechanism
(core magnet)
Class 1.5
(1.5 % of max. scale value)
vertical
sinusoidal
45-200 Hz
200 mm
25 mm
0 ... 1 / 0 ... 3 / 0 ... 10 / 0 ... 30
/ 0 ... 100 / 0 ... 300 / -10 ... 10
linear
105 div. (0 ... 1/ 10/ 100)
66 div.
(0 ... 3/ 30/ 300)
42 div.
(-10 ... 10)
80 mm
2 mm
0 ... 10 / 0 ... 3 / -10 ... 10
linear
21 div.
(0 ... 10)
33 div.
(0 ... 3)
22 div.
(-10 ... 10)
Double or reinforced insulation
throughout
1kV
3 Function indicator
4 Function (meas. quantity) switch
Voltage measurements:
5 Mode indicator
Internal resistance:
6 Mode switch (on/off)
7 Zero-point adjuster
8 Safety sockets,
with patented automatic socket inhibitor
9 View window for scale
10 Small display
11 Overview of instructions
12 Battery compartment
13 Carrying handle
100 kΩ
10 MΩ
1 GΩ
30 GΩ
measuring function mV
measuring function V
measuring function kV,
without probe
measuring function kV,
with probe
Current measurements:
Voltage drop:
120 mV
200 mV
Measurement
function µA, mA
MeasurementfunctionA
Power supply:
2
1
2
3 batteries
1.5 V, type IEC R 20
or
1.2 V, type IEC HR 20
Scope of supply
Demo multimeter,
incl. 3 batteries 1.5 V, type IEC R 20
Holder, for mounting in the demonstration experiment
frame (301 300)
Battery life:
1.5 V, type IEC R 20:
approx. 500 hours
1.2 V, type IEC HR 20:
approx. 100 hours
Automatic cutout:
after 50-60 min.
General data:
Dimensions of housing:
Weight:
approx. 39 cm × 34 cm × 23 cm
approx. 5.1 kg
Instruction sheet 531 900
4
5
page 3/6
Explanation of symbols
Danger point (see
Instruction Sheet)
Common ground
connection
Alternating
current/voltage
Battery test
Moving-coil
mechanism (core
magnet)
Ground symbol
Direct
current/voltage
Symbol of EC
conformity
Electronics in
measurement
circuit
Fully protected
with double or
reinforced
insulation
Accuracy class 1.5
Clip-on ammeter
1.5
Operation
5.2 Inserting and changing batteries:
5.1 Switching on and off:
OFF
OFF
OFF
kΩ
0
OFF
kΩ
0
kΩ
III II IIIII IIIIIIII IIII IIIIIII II IIIII IIIIIIII IIII IIIIIII II IIIII IIIIIIII IIII IIIIIII II IIIII
IIIIIIII IIII IIIIIII II IIIII IIIIIIII IIII IIIIIII II IIIII IIIIIIII IIII IIIIIII II IIIII IIIIIIII IIII
IIIIIII II IIIII IIIIIIII IIII IIIIIII II IIIII IIIIIIII IIII IIIIIII II IIIII IIIIIIII IIII IIIIIII II
IIIII IIIIIIII IIII IIIIIII II IIIII IIIIIIII IIII IIIIIII II IIIII IIIIIIII IIII IIIIIII II IIIII IIIIIIII
OFF
0
kΩ
kV
kV
kV
Switching the meter on:
− Turn the mode switch from the OFF position to either the S or
- position.
Switching the meter off:
− Turn the mode switch to the OFF position.
When the device is switched off, the display pointer points to
off (full left mechanical deflection of scale).
III II IIIII IIIIIIII
IIII IIIIIII II IIIII
IIIIIIII IIII IIIIIII
II IIIII IIIIIIII IIII
IIIIIII II IIIII
IIIIIIII IIII IIIIIII
II IIIII IIIIIIII IIII
IIIIIII II IIIII
IIIIIIII IIII IIIIIII
II IIIII IIIIIIII IIII
IIIIIII II IIIII
V
mV
kV
µA
A
kΩ
mA
A
− Disconnect the demo multimeter from the measurement circuit.
− Carefully pry off the cover of the battery compartment, e.g.
using a screwdriver.
− Remove the old batteries, and clean the contacts if necessary.
− Insert the new batteries with the correct polarity.
− Reclose the cover.
5.3 Battery test:
Automatic cutout:
The demo multimeter automatically switches off after approx.
50 - 60 minutes; the indicator needle points to the position off. If
this pointer position is not due to a negative voltage:
− Switch the mode switch to OFF and then turn it back to the respective mode again.
If the demo multimeter is not to be used for a longer period:
− Remove the batteries from the battery compartment.
III II IIIII IIIIIIII IIII IIIIIII II IIIII IIIIIIII IIII IIIIIII II IIIII IIIIIIII IIII IIIIIII II IIIII
IIIIIIII IIII IIIIIII II IIIII IIIIIIII IIII IIIIIII II IIIII IIIIIIII IIII IIIIIII II IIIII IIIIIIII IIII
IIIIIII II IIIII IIIIIIII IIII IIIIIII II IIIII IIIIIIII IIII IIIIIII II IIIII IIIIIIII IIII IIIIIII II
IIIII IIIIIIII IIII IIIIIII II IIIII IIIIIIII IIII IIIIIII II IIIII IIIIIIII IIII IIIIIII II IIIII IIIIIIII
OFF
kΩ
III II IIIII IIIIIIII
IIII IIIIIII II IIIII
IIIIIIII IIII IIIIIII
II IIIII IIIIIIII IIII
IIIIIII II IIIII
IIIIIIII IIII IIIIIII
II IIIII IIIIIIII IIII
IIIIIII II IIIII
IIIIIIII IIII IIIIIII
II IIIII IIIIIIII IIII
IIIIIII II IIIII
V
mV
kV
kΩ
mA
µA
A
A
− Disconnect the demo multimeter from the measurement circuit.
− Set the mode switch to the “battery test” position.
− Read off the battery state from the display on the rear.
page 4/6
Instruction sheet 531 900
5.4 Setting the zero point:
5.5 Mounting the meter in the demonstration
experiment frame
0
-5
-10
5 1
0
F
OF
-0-
0
-5
-10
531 900
5 1
0
OFF
V kV
µA
mV
V
V
OFF
kΩ
531 900
mA
A
OFF
kΩ A
V
mV
kV
V
mV
kV
µA
A
µA
kΩ
A
kΩ
mA
A
A
mV mA
A
300V µA
kΩ
30A
A
mV mA
A
300V µA
kΩ
30A
kV
1000V CAT II
kV
1000V CAT II
− Disconnect the demo multimeter from the measurement circuit and switch it on.
− Set the zero point of the desired scale using e.g. a screwdriver.
6
kΩ
0
A
0
kΩ
mA
OFF
− Attach the demo multimeter to the holder and clamp it in
place using the handle.
− Suspend the demo multimeter with holder from the profile
rail of the demonstration experiment frame (301 300).
Measuring voltages
6.2 Measuring voltages up to 10 kV:
6.1 Measuring voltages up to 300 V:
0
-5
-10
5 1
0
mV
-0-
V
1
kV
531 900
V
531 900
kV
OFF
V
kΩ
mA
100
µA
A
mV mA
A
300V µA
kΩ
30A
kΩ
0
A
kV
300
1000V CAT II
– (+) /
– (+) /
+ (–) /
+ (–) /
Attention:
− Do not expose the measuring ranges to overloads greater
than the maximum permissible level.
Overload capacity:
10
OFF
A
kΩ
mA
A
1
mV
kV
kΩ
0
-03
10
mV
A
5 1
0
OFF
30
mV
kV
µA
-5
-10
3
OFF
0
250 V (measurement function mV)
600 V (measurement function V, -)
400 V (measurement function V, S)
− Select the measurement function mV or V using the function
switch and then connect the meter to the measurement circuit.
− Switch on the demo multimeter by selecting the type of current S or - .
− Using the scale wheel, select one of the scales 0 ... 1, 0 ... 3,
0 ... 10, 0 ... 30, 0 ... 100, 0 ... 300 or -10 ... 10.
A
mV mA
A
300V µA
kΩ
30A
kV
1000V CAT II
Attention:
− Do not measure dangerous contact voltages greater than 1 kV!
− Do not expose the measuring range to overloads greater
than the maximum permissible level.
Overload capacity:
15 kV
− Select the measurement function kV using the function
switch and then connect the meter to the measurement circuit.
− Switch on the demo multimeter by selecting the type of current S or - .
− Using the scale wheel, select one of the scales 0 ... 1, 0 ... 3,
0 ... 10 or -10 ... 10.
Instruction sheet 531 900
7
page 5/6
Measuring currents
7.2 Measuring currents up to 30 A:
7.1 Measuring currents up to 300 mA:
0
-5
-10
5 1
0
µA
-0-
mA
1
A
V
531 900
V
kΩ
mA
100
kΩ
0
µA
A
30A
OFF
A
kΩ
mA
A
A
mV mA
300V µA
kΩ
10
mV
kV
A
1
30
A
OFF
mV
-03
OFF
30
µA
kV
5 1
0
10
531 900
µA
-5
-10
3
OFF
0
kΩ
0
A
300
kV
1000V CAT II
– (+) /
– (+) /
+ (–) /
+ (–) /
A
mV mA
A
300V µA
kΩ
30A
kV
1000V CAT II
Attention:
− Measure currents greater than 2 mA DC only at voltages of
less than 1000 V.
− Do not expose the measuring range to overloads greater than
the maximum permissible level.
Attention:
− Measure currents greater than 2 mA DC only at voltages of
less than 1000 V.
− Do not expose the measuring range to overloads greater
than the maximum permissible level.
Overload capacity:
Overload capacity:
20 A
− Select the measurement function mA or A using the function
switch and then connect the meter to the measurement circuit.
− Switch on the demo multimeter by selecting the type of current S or - .
− Using the scale wheel, select one of the scales 0 ... 1, 0 ... 3,
0 ... 10, 0 ... 30, 0 ... 100, 0 ... 300 or -10 ... 10.
8
30 A
− Select the measurement function A using the function
switch and then connect the meter to the measurement circuit.
− Switch on the demo multimeter by selecting the type of current S or -.
− Using the scale wheel, select one of the scales 0 ... 1, 0 ... 3,
0 ... 10 or -10 ... 10
Measuring resistance values
kΩ
2
1
0
3
1
3
10
OFF
531 900
30
100
kΩ
V
OFF
mV
kV
µA
A
kΩ
mA
300
kΩ
0
A
A
mV mA
A
300V µA
kΩ
30A
–
kV
1000V CAT II
+
− Using the function switch, select the measurement function
kΩ and then connect the measurement leads.
− Switch on the demo multimeter by selecting the operating
mode kΩ.
− Using the scale wheel, select one of the scales
0 ... 1.0 ... 3.0 ... 10.0, 0 ... 100 or 0 ... 300.
− Test the resistance to be measured using the measuring
leads.
page 6/6
9
Instruction sheet 531 900
Measuring DC voltages up to 300 kV
10
Measuring currents up to 300 A (200 A)
20A
kV
20
10
0
30
A
100
30
0
300
OFF
2
1
kV
V
3
mV
mA
kΩ
A
A
V
A
30A
OFF
kV
mV
mA
kΩ
µA
kΩ
A
0
A
A
mV mA
300V µA
kΩ
10
531 900
OFF
kV
1
3
OFF
531 900
µA
-0-
kΩ
0
200A
A
30
A
kV
1000V CAT II
A
mV mA
A
300V µA
kΩ
30A
100
kV
1000V CAT II
300
– (+)
– (+) /
+ (–)
+ (–) /
Additionally required:
1 High tension probe
OFF
20
200
Additionally required:
531 93
1 Clip-on ammeter
531 901
Attention:
Attention:
− Do not measure dangerous contact voltages greater than
1 kV!
− Do not expose the measuring range to overloads greater than
the maximum permissible level.
− Measure currents greater than 2 mA DC only at voltages of
less than 1000 V.
− Do not expose the measuring ranges to overloads greater
than the maximum permissible level.
Overload capacity:
300 kV
Overload capacity:
Accuracy:
Class 5
− Select the measurement function kV using the function switch
and then connect the high tension probe.
− Switch on the demo multimeter by selecting the type of current -.
− Use the scale wheel to select the scale 0 ... 30, 0 ... 100 or
0 ... 300
− Test the voltage-carrying wire using the high tension probe
(see the Instruction Sheet for the high tension probe).
30 (20) A in setting “20” of clip-on
ammeter
300 (200) A in setting “200” of clip-on
ammeter
− Use the function switch to select the measurement function
Z and then connect the clip-on ammeter (connect the black
plug to the ground socket).
− Switch on the demo multimeter by selecting the type of current S or - .
For currents up to 10 A:
− Set the clip-on ammeter to 20 A and select one of the scales
0 ... 1, 0 ... 3, 0 ... 10 or -10 ... 10 using the scale wheel.
For currents up to 300 A ( -) resp. 200 A (S):
− Set the clip-on ammeter to 200 A and select one of the scales 0 ... 30, 0 ... 100 or 0 ... 300 using the scale wheel.
− Attach the clip-on ammeter to the current-carrying wire and
switch on the supply voltage (see Instruction Sheet of clip-on
ammeter).
LEYBOLD DIDACTIC GMBH ⋅ Leyboldstrasse 1 ⋅ D-50354Hürth ⋅ Phone (02233) 604-0 ⋅ Telefax (02233) 604-222 ⋅ e-mail: info@leybold-didactic.de
© by Leybold Didactic GmbH
Printed in the Federal Republic of Germany
Technical alterations reserved