The paper describes the implementation of successive frequency-to-voltage and voltage-to-frequency conversion used to achieve a wideband frequency multiplication allowing reactive power and reactive energy measurements in the range of 40 Hz to 70 Hz of the input signal frequency. It also describes a phase shifting method which provides independence of the shifted signal of the capacitor value used in the phase shifter. This feature ensures long term stability and wide temperature operating range of the meter while retaining high accuracy
Published in:
Instrumentation and Measurement, IEEE Transactions on
(Volume:47
,
Issue:
1
)
Date of Publication: Feb 1998