3B SCIENTIFIC PHYSICS 1021406 Manual De Instrucciones página 10

Fig. 3: Determination of field strength for a plate capacitor

Use the offset knob (5) to calibrate the volt-
age between sockets (2) and (4) to zero.

Set up a separation of 1 mm.
Note: Each clockwise turn of the spacing ad-
justment knob (14) increases the separation
of the plates by 1 mm. Make a note of the ze-
ro position.

Connect the positive terminal of the high-
voltage power supply with the capacitor
measurement plate via a protective 10 MΩ
resistor (1022192) and the negative terminal
to the ground socket for the detector vanes
(4).

Turn on the 500 V DC power supply.

Set the DC power supply to 100 V.
5
4,5
4
3,5
3
2,5
2
1,5
1
0,5
0
Graph 1: Plot of output voltage Ua against effective plate separation D/mm
3B Scientific GmbH ▪ Rudorffweg 8 ▪ 21031 Hamburg ▪ Germany ▪
Offset separation
(capacitor voltage U = 100 V, measuring range = 10 kV/m)
Subject to technical amendments

Measure voltages between sockets (2) and
(4) for plate separations changing in steps of
1 mm (cf. graphs 1 and 2).
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