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Fig. 1: Electric field meter used as induction electrometer
6.0 Experiments
6.1 Measurement of potential – Electric field
meter used as static voltmeter
Additionally required:
1 High-voltage power supply
10 kV @115 V
or
10 kV @230 V
1 Digital multimeter e.g.
1 Resistor, 10 MΩ
Set up the experiment with the voltage
measurement plate (16) as shown in Fig. 2.
Connect the display instrument to the volt-
age output (2) and (4).
Place the measurement plate (16) over the
detection vanes (7) and gently(!) screw it into
place by hand.
Set the selector switch (11) to "(U/V)".
Carry out zero calibration as in section 3.
Connect the positive terminal of the high-
voltage power supply with the voltage meas-
urement plate via a protective 10 MΩ resis-
tor. The negative terminal should be con-
nected to the ground socket of the screening
cylinder.
Set the range selector switch (6) to 1000.
Note: Voltage measurement puts no load on
the voltage source, so no voltage drops
across the large protective resistor.
Turn on the high-voltage power supply.
3B Scientific GmbH ▪ Rudorffweg 8 ▪ 21031 Hamburg ▪ Germany ▪
In this example the high-voltage supply is set to
1500 V.
U = U
MB =
U
U
A
1.5 V
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6.2 Electric field measurement with 250 cm²
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The electric field strength E of a capacitor made
up of a fixed plate (15) and measurement plate
(13) is to be measured to see how it depends on
plate separation and the applied voltage.
Additionally required:
1 High-voltage power supply DC 500 V @115 V
or
1 High-voltage power supply DC 500 V @230 V
1 Resistor, 10 M
Set up the experiment as shown in Fig. 3.
Subject to technical amendments
* MB = 1.5V * 1000 = 1500V
A
Measuring range
=
Voltage at measuring plate (16)
= Measured voltage
is measured at the output sockets.
capacitor measurement plate
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Position the fixed capacitor plate (15) next to
the field detector vanes (7) while the equip-
ment is switched off and gently tighten the
screw under the fixed plate (15) by hand.
Connect the measurement plate (13) to the
ground socket (10).
Set the spacing adjustment knob (14) to ze-
ro.
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1022192
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