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4. Measurement procedure
It is recommended that you wait about 15
minutes after turning on the measurement am-
plifier U before starting any measurements in
order for all components to settle into a stable
equilibrium and thus minimise offset drift.
Connect the measurement amplifier to the
mains using the plug-in power supply pro-
vided.
Connect a voltmeter or oscilloscope to the
measurement output.
Short the measurement input and calibrate
the offset to 0 V.
Connect the signal to be measured to the
measurement input.
Select a suitable gain factor for the input
voltage range (cf. Table 1).
Activate the low-pass filter if needed by set-
ting a time constant > 0 s.
Measuring
Voltage
Amplifier U
Source
R
<
R
=
out
in
50
10 k
Fig. 1: Block circuit diagram specifying input and out-
put resistance
Measurement of current
Additionally recommended:
Resistance 100 Ω, 5 %
By connecting an external resistor R
input of the measurement amplifier it is also
possible to measure amperage. A connected
voltmeter displays the voltage:
.
n
U
10
R
I
Shunt
To avoid errors in measurement, do not se-
lect an external resistor of larger than 100 Ω
if possible. If necessary, measure the re-
sistance with an ohmmeter.
Take note of maximum current.
3B Scientific GmbH ▪ Ludwig-Erhard-Str. 20 ▪ 20459 Hamburg ▪ Germany ▪ www.3bscientific.com
V
R
=
R
>
out
in
300
10 k
1012910
to the
Shunt
Technical amendments are possible
© Copyright 2022 3B Scientific GmbH
Measuring
Current
Amplifier U
Source
Fig. 2: Block circuit diagram for current measure-
ment.
5. Storage, cleaning and disposal
Keep the equipment in a clean, dry and
dust-free place.
Before cleaning the equipment, disconnect
it from its power supply.
Do not clean the unit with volatile solvents
or abrasive cleaners.
Use a soft, damp cloth to clean it.
The packaging should be disposed of at lo-
cal recycling points.
Should you need to dis-
pose of the equipment
itself, never throw it
away in normal do-
mestic waste. If being
used in private house-
holds it can be dis-
posed of at the local
public waste disposal
authority.
Comply with the applicable regulations for
the disposal of electrical equipment.
V
R
=
R
>
out
in
300
10 k
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