ALAT UKUR ELEKTRODINAMIS SEBAGAI AMPEREMETER

ALAT UKUR ELEKTRODINAMIS SEBAGAI VOLTMETER

1. The inductance of a moving iron ammeter with a full scale deflection to 90 at 1,5 A, is given by the expression :L= 200 + 40 - 42 - 3 microhenry where is the deflection in radian from zero position. Estimate the angular deflection of the pointer for a current of 1,0 A.

2. Calculate the constants of a shunt to extend the range of 0 – 5 A moving iron ammeter to 0 – 50 A. The instrument constant are R=0,09 Ohm and L=90 microhenry. If the shunt is made non-inductive and the combination is correct on d.c., find the full scale error at 50 Hz.