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|
|Deposited By:||Mr. Parth Pradhan|
|Deposited On:||11 May 2009 10:25|
|Last Modified:||11 May 2009 10:25|
|Supervisor(s):||Mahapatra, K K|
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