3-24 A rectifier ammeter has the following components: PMMC instrument with FSD = 200 µA and Rm = 900 N; current transformer with N, = 600 and N, = 5; diodes with VF - 0.3 V; meter series resistance R, = 270 kN; transformer shunt secondary resis- tance RL = 98.7 kN. Calculate the level of transformer primary current for instru- ment FSD.

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3-24 A rectifier ammeter has the following components: PMMC instrument with FSD =
200 µA and Rm = 900 N; current transformer with N, = 600 and N, = 5; diodes with
VF = 0.3 V; meter series resistance R,=270 kN; transformer shunt secondary resis-
tance Rį = 98.7 kN. Calculate the level of transformer primary current for instru-
ment FSD.
3-25 Calculate the sensitivity of the ac voltmeter in Example 3-11 when diode D2 is (a)
included in the circuit and (b) omitted from the circuit.
3-26) A PMMC instrument with 250 µA FSD has a specified accuracy of ±2%. Calculate
the measurement accuracy at currents of 200 uA and 100 HA.
Transcribed Image Text:3-24 A rectifier ammeter has the following components: PMMC instrument with FSD = 200 µA and Rm = 900 N; current transformer with N, = 600 and N, = 5; diodes with VF = 0.3 V; meter series resistance R,=270 kN; transformer shunt secondary resis- tance Rį = 98.7 kN. Calculate the level of transformer primary current for instru- ment FSD. 3-25 Calculate the sensitivity of the ac voltmeter in Example 3-11 when diode D2 is (a) included in the circuit and (b) omitted from the circuit. 3-26) A PMMC instrument with 250 µA FSD has a specified accuracy of ±2%. Calculate the measurement accuracy at currents of 200 uA and 100 HA.
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