3B Scientific AM51 User Manual

U17451 Analog Multimeter
Instruction sheet
10/04 MC/ALF
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Handheld meter used to measure current, voltage and resistance as well as gain levels or attenuation e.g. in chains of quadripoles.
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.
1 Rotary switch to select
measurement range
2 Rotary knob to set full-scale
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deflection for 0
3 Connection for voltage
measurement
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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 not 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
resistance measurement
5 Connection for ground 6 Adjustment screw for
mechanical zero-point setting
7 Nub to latch the housing
shut
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higher measurement range to a 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
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 spring-connected bearing jewels of the movement guarantee protec­tion against damage caused by me­chanical stress.
Measurement ranges: Voltage measurement:
DC
Meas. range Int. resistance
100 mV 2 k
1 V 20 k 10 V 200 k 30 V 600 k
100 V 2 M 300 V 6 M 600 V 12 M
Meas. range Int. resistance
AC
10 V 66,7 k
30 V 200 k 100 V 667 k 300 V 2 M 600 V 4 M
Current measurement:
DC
Meas. range Voltage drop
50 µA 100 mV
1 mA 500 mV
10 mA 500 mV
100 mA 500 mV
1 A 190 mV
AC
Meas. range Voltage drop
3 mA 1.5 V
30 mA 1.6 V
300 mA 1.6 V
3 A 1.8 V
Resistance measurement:
Max. Rotary Meas. range meas. switch and scale center current
x 1 1 ...35 k...5 kΩ 45 mA
x 10 10 ...350 k...50 kΩ 4.5 mA
x 100100 ...3.5 k...500 k0.45 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% Reference conditions:
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