3B SCIENTIFIC
®
PHYSICS
1
Analogue Multimeter AM51 1003074
Instruction sheet
04/15 SD
1 Rotary switch to select
measurement range
2 Rotary knob to set full-scale
deflection for 0 Ω
3 Connection for voltage
measurement
4 Connection for current and
resistance measurement
5 Connection for ground
6 Adjustment screw for
mechanical zero-point
setting
7 Nub to latch the housing
shut
1. Safety instructions
• Before using the analogue multimeter, make
sure you read the operating instructions
carefully and that you comply with them
completely.
• The safety of the multimeter and the person
operating it can only be guaranteed if it is
used in accordance with the instructions. Do
not operate or handle this unit incorrectly or
inappropriately.
• The device may only be used by persons,
who are aware of the hazards of contact (for
voltages over 30 V rms) and can undertake
the appropriate safety precautions. This also
includes the appearance of unforeseen voltages e.g. in defective units or charged capacitors.
This multimeter is not a toy and must not fall into
the hands of children.
• Do not place it, keep it or use it anywhere
within reach of children.
• When the multimeter is used by teenagers,
trainees etc., a suitable person should supervise to ensure the equipment is used safely.
• If measurements are made where there are
any risks of coming into contact with electricity, a second person is to be informed.
• Be particularly careful when measuring voltages in excess of 33 V AC (RMS) or 70 V
DC.
• For voltages which are in excess of 33 V AC
or 70 V DC, only use safety measurement
leads conforming at least to CAT II.
• In the case of voltage and current measurements the nominal voltage between the
phase and neutral conductor may not exceed
300 V according to CAT II (in circuits that are
directly connected to the mains) and CAT III
(in building wiring installations) 300 V.
• The analogue multimeter may not be used
for measurements in circuits with corona
discharge (high voltage).
• In measurements involving RF circuits special care must be taken due to the existence
of dangerous hybrid voltages.
• The appropriate permissible measurement
range may not be exceeded. Always change
from a higher measurement range to a lower
measurement range.
• Before using the device, check the housing
and the measurement cables for any damage.
• The multimeter may only be used in a dry,
dust-free environment with no risk of explosions occurring. Workplace, hands, shoes
and floor must be dry.
2
• Before opening the housing all measurement leads are disconnected from the device.
• Do not dispose of the battery in the regular
household garbage. Follow the local regulations.
1.1 Symbol legend
Hazard, read instruction sheet
V Voltage
A Current
Moving coil galvanometer
AC/DC quantities accuracy class 2,5
Use in horizontal position
DC quantities
AC quantities
CAT Measuring category as per IEC EN
61010-1
Double insulated casing
CE EU conformity mark
Earth symbol
┴ Ground symbol
Battery symbol
2. Description
Handheld meter used to measure current, voltage and resistance as well as gain levels or
attenuation e.g. in chains of quadripoles.
Passive analog multimeter with a rotary switch
for selecting the measurement ranges and a
scale with mirrored background for parallaxfree
readings. The device is extremely robust in
terms of load capacity and is equipped with excellent overload protection due to its two antiparallel diodes as well as moving coil movement, which is not sensitive to external electromagnetic fields. The safety connection sockets
offer protection against accidental touch contact.
The robust plastic housing and the springconnected bearing jewels of the movement
guarantee protection against damage caused by
mechanical stress.
3. Technical data
Measurement ranges:
Voltage measurement:
DC
Measurement range Internal resistance
100 mV 2 kΩ
1 V 20 kΩ
10 V 200 kΩ
30 V 600 kΩ
100 V 2 MΩ
300 V 6 MΩ
600 V 12 MΩ
AC
Measurement range Internal resistance
10 V 66.7 kΩ
30 V 200 kΩ
100 V 667 kΩ
300 V 2 MΩ
600 V 4 MΩ
Current measurement:
DC
Measurement range Voltage drop
50 µA 100 mV
1 mA 500 mV
10 mA 500 mV
100 mA 500 mV
1 A 590 mV
AC
Measurement range Voltage drop
3 mA 1.5 V
30 mA 1.6 V
300 mA 1.6 V
3 A 1.8 V
Widerstandsmessung:
Rotary
switch
Measurement range
and scale centre
Max. meas.
current
Ω x 1 1 Ω...35 kΩ...5 kΩ 45 mA
Ω x 10
10 Ω...350 kΩ...50
kΩ
4.5 mA
Ω x 100
100 Ω...3.5 kΩ...500
kΩ
0.45 mA
Accuracy:: Class 2.5
Influencing variables and nominal operating
ranges:
Temperature 0 – 40° C: ± 1% / 10 K for DC
± 2.5% / 10 K for 100 mV/50 µA DC
± 1.5% / 10 K for AC
Frequency (30 Hz...1 kHz): ± 2.5%
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