Design Sign of Delta Sigma Wattmeter

Pradhan, Parth (2009) Design Sign of Delta Sigma Wattmeter. BTech thesis.



Instantaneous power in a load is measured by multiplying the voltage across it by the current flowing through it. The multiplication is achieved in a delta sigma wattmeter by using two samplers rather than a multiplier. Sampling and multiplication are closely related. For example, double side-band suppressed carrier modulation can be produced by either multiplying an analogue signal with a sinusoidal carrier, or by sampling the analogue signal with a binary pulse train and filtering these samples. Alternatively these samples can be produced without a sampler if a multiplier is used. This is achieved by multiplying pulse train, whose binary values are arranged to be zero or unity, with the analogue signal.
The delta-sigma wattmeter is given this name because the voltage developed across the load in which the power is to be measured is encoded by a delta sigma modulator, d.s.m into a binary waveform. The d.s.m. decoder is just a low-pass filter

Item Type:Thesis (BTech)
Uncontrolled Keywords:wattmeter, delta-sigma modulation, delta-sigma wattmeter, delta modulation
Subjects:Engineering and Technology > Instrumentation
Divisions: Engineering and Technology > Department of Electronics and Communication Engineering
ID Code:208
Deposited By:Mr. Parth Pradhan
Deposited On:11 May 2009 10:25
Last Modified:11 May 2009 10:25
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Supervisor(s):Mahapatra, K K

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