Potentiometer Error Detector

PED - 101

All feedback control systems operate from the error signal which is generated by a comparison of the reference and the output. Error detectors perform the crucial task of comparing the reference 'and output signals. In a purely electrical system where the reference and output are voltages, the error detector is a simple comparator. In some other systems with non-electrical outputs, the output signal is converted into electrical form through a measurement or transducer block, and then error detection is performed on the electrical signals. A position control system, with both input and output variables as mechanical positions (linear or angular), may however consist of two potentiometers -reference and output, which function as an error detector. Other devices which could be used in similar applications include synchro sets (for a,c. systems), sine-cosine potentiometers, hall effect-potentiometers etc, which unfortunately are not readily available.

  • Linearity study of the error detector.
  • Determination of error detector gain.
  • Use of a.c. supply for the error detector- introduction to the phase reversal of error signal.
  • High quality servo potentiometers of 360° shaft rotation.
  • Built-in signal and power sources.
  • 3 ½ digit DVM for measurements rnt, qtinn.
  • 220 V ±10% 50H7 mains operation.
  • Requires an external CRO for a.c. Studies.
The present set-up is designed to study the important characteristics of a 2-potentiometer angular position error detector. These include  :
  • Linearity. 
  • Sensitivity. 
  • Maximum angle of rotation.



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