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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Rx = un Bn 1u n h.oT t *' lcYt tl-

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Rx.: R:a + Rba

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r"

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