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3. Technical data
Ranges (with reference to 1 V output voltage):
Voltage:
Current:
Charge:
Input resistance:
Voltage:
Current/charge:
Precision:
Measurement output:
Output voltage:
Operating voltage:
Dimensions:
Weight:
4. Operation
4.1 Voltage measurements
Caution:
Voltages in excess of 300 V may only be applied to
terminal "U" (10) with a measuring range of 100 V/1 V.
•
Connect voltmeter to terminal pair (5).
•
Calibrate the zero point for the voltmeter using the
"Offset" knob (7) where necessary (only relevant for
highly sensitive ranges).
•
Connect the voltage to be measured via a BNC cable
to socket "U" (10) and ground (11).
•
Set the polarity switch (6) to the right for positive
voltages or to the left of the measured voltage is
negative.
Range
Gain
100 V
0.01
10 V
0.1
1 V
1
100 mV
10
10 mV
100
1 mV
1000
100 μV
10000
Elwe Didactic GmbH • Steinfelsstr. 6 • 08248 Klingenthal • Germany •
3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany •
0.1 mV – 100 V (7 ranges)
-11
-4
10
– 10
A (7 ranges)
-11
-7
10
– 10
As (5 ranges)
10 MΩ
0 Ω, for voltages up to 300 V
3%
0 – 10 V
Zero point calibration and
reversible polarity
±15 V or 30 V, max. 50 mA
See reverse of apparatus
235 × 230 × 180 mm
2.8 kg approx.
Value corresponding to scale
limit of display instrument
10 V
3 V
1000 V
300 V
100 V
100 V
30 V
10 V
3 V
1 V
300 mV
100 mV
100 mV
30 mV
10 mV
10 mV
3 mV
300 μV
100 μV
1 mV
Subject to technical amendments
© Copyright 2008 3B Scientific GmbH
4.2 Current measurements
•
Connect voltmeter to terminal pair (5).
•
Calibrate the zero point for the voltmeter using the
"Offset" knob (7) where necessary (only relevant for
highly sensitive ranges).
•
Connect the current to be measured via a BNC
cable to socket "I Q" (9) and ground (11).
An output of 1 V to the display from the amplifier cor-
responds to the current value selected for the range.
Measured current = range value on front panel x de-
flection of voltmeter.
4.3 Charge measurements
•
Connect voltmeter to terminal pair (5).
•
Press "Discharge" button (12) to discharge any exist-
ing charge.
•
Conductors in the circuit may lead to inaccuracies
in the measurement (due to innate capacitance,
magnetic leakage). For this reason it is practical to
plug a contact pin directly into terminal (9) to mea-
sure the charge
The voltage displayed by the voltmeter corresponds to
the value of the charge. Here too, an output of 1 V to
the display instrument corresponds to the charge given
by the range setting of the amplifier.
Since the displayed value for a change is held static,
charges can be applied repeatedly. The value displayed
then corresponds to the sum of all the individual char-
ges. Any charge applied to the measuring amplifier can
be cancelled out by another charge of opposing sign.
4.4 Use of the measuring amplifier as a DC power
supply
To output a fixed DC voltage of 15 V:
•
Connect the positive pole of the load to either ter-
minal "L+" or "L-" (2 or 4). Connect the negative po-
le to terminal "0" (3).
To output a fixed DC voltage of 30 V:
•
Connect the positive pole of the load to terminal
"L+" (2) and the negative to terminal "L-" (4).
1 V
10 V
1 V
1 mV
directly.
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