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Gall Tinsley coordinate potentiometer
1.DC standardisation done with Standard cell and Ballistic galvanometer. DC supply at Supply
phase1 and Weston cell at A-A'. Next, Connect AC supply to Supply phase1. Adjust R to get
same current in RMS. This is AC standardisation. Replace BG with VG,
2.Unknown voltage is connected at A-A' and both inphase and quadrature potentiometers are
adjusted to get null. In phase component of voltage V a is read in in phase potentiometer and
quadrature Vb is read in quadrature potentiometer.
3. Voltage V= Square root of (Va2 + Vb
2)
Phase angle = tan-1 (Va/Vb )
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