3B Scientific AM50 User Manual
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3B SCIENTIFIC®
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PHYSICSPHYSICS
PHYSICS
PHYSICSPHYSICS
U17450 Analog Multimeter with Zero-point Center/Left
Instruction Sheet
10/04 MC/ALF
1 Rotary switch to select the
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4
2
1
measurement range
2 Rotary knob to set the
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electrical zero-point in the
center of the scale
3 Safety connection sockets
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4 Slide switch to select the
operating mode
5 Adjustment screw to set the
zero-point mechanically
6 Nub to latch the housing
shut
Handheld meter for current and
voltage measurement.
1. Safety instructions
• Before using the analog multime-
ter, 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.
• 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 analog multimeter may be
used for measurements in circuits
with corona discharge (high voltage).
• In measurements involving RF cir-
cuits special care must be taken
due to the existence of dangerous
hybrid voltages.
• The appropriate permissible mea-
surement range may not be exceeded. Always change from a
higher measurement range to a
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lower measurement range.
• Before using the device, check the
housing and the measurement
cables for any damage.
• Do not conduct measurements in
a damp environment. Workplace,
hands, shoes and floor must be
dry.
• Before opening the housing all
measurement leads are disconnected from the device.
2. Description, technical data
Active analog multimeter with a
slide switch for selection of the operating mode and a rotary switch to
select the measurement range as
well as a scale with the mirrored
background for parallax-free readings with a zero-point adjustable to
the center or the left of the scale.
By adjusting the electrical zero-point
to the center of the scale bipolar DC
voltage and current measurements
can be conducted without worrying
about polarity. The device is extremely robust in terms of load capacity and is equipped with excellent overload protection due to its
two anti-parallel 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. After approx. 45
mins the battery is automatically
switched off. The power can be reestablished by turning off and on
using the slide switch for the operating mode. The robust plastic housing and the spring-connected bearing jewels of the movement guarantee protection against damage
caused by mechanical stress.
Measurement ranges:
Voltage measurement:
DC
Meas. range Internal resistance
100 mV 10 MΩ
300 mV 10 MΩ
1 V 10 MΩ
3 V 10 MΩ
10 V 10 MΩ
100 V 10 MΩ
300 V 10 MΩ
AC
Meas. range Internal resistance
3 V 1 MΩ
10 V 1 MΩ
30 V 1 MΩ
100 V 1 MΩ
300 V 1 MΩ
Current measurement AC/DC:
Meas. range Voltage drop
0.1 mA 55 mV
1 mA 55 mV
10 mA 55 mV
100 mA 55 mV
1 A 53 mV
3 A 51 mV
Accuracy: DC class 2; AC class 3
Effective variables and nominal operating ranges:
Temperature 0 – 40° C: ± 2% / K
Frequency for all measurement
ranges: ±2.5% at 30 Hz up to
1.5 kHz ± 5% at 1.5 kHz
up to 3 kHz
Reference conditions:
Ambient temperature: +23° C ± 2 K
Frequency: 50 to 60 Hz
Waveform: Sinusoidal
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