3.2 D'ARSONVAL METER MOVEMENT WITH HALF-WAVE RECTIFIER

Solution:

Method 1

The sensitivity of the meter movement, 1k / Ifs = 1k / 1m = 1kΩ/V

Rs = Sdc x Rangedc – Rm

= 1k x (0.45Erms)/1 - Rm

= 4.2kΩ

Method 2

The ac sensitivity for half wave rectifier, Sac = 0.45Sdc = 0.45(1k) = 450Ω/V

Rs = Sac X Rangeac – Rm

= 450 X 10 –300

= 4.2kΩ

Method 3

Rs = ( 0.45Erms / Ifs ) - Rm

= (( 0.45 x 10 ) / 1m) - 300

= 4.2kΩ

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