Peekel Instruments User manual PICAS V2.6.1
Page 13 of 59
2.1.9 Potentiometer connection
A potentiometer can be connected as a half bridge, 3 wire connection:
5
9
6
1
Connect cable screen to
connector case.
Figure 9: Potentiometer connection as a half bridge, 3-Wire
The linearity of the measurement is influenced by the impedance of the potentiometer.
When the potentiometer value is between 120 and 350 Ohm, the linearity of the
measurement is within 0.1 %.
When measuring a Potentiometer based sensor, the mid position of the potentiometer will
be the zero point. Moving the potentiometer to the minimum or maximum position, the
output value will be in the range of –full range to +full range.(-100% to +100%).
Based on the actual input resistance of the CA2CF of about 50K, the following non-linearity
will be present when measuring a potentiometer with a higher value:
potentiometer value linearity
500 ohm 0.15 %
1000 ohm 0.3 %
5000 ohm 1.45 %
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