Articles

AC-DC Current Shunts vs. Current Transformers

Although all Valhalla wattmeters are compatible with general purpose current transformers, there are distinct accuracy and bandwidth advantages to using a current shunt when making a power measurement. Current shunts generally provide greater accuracy over a broader frequency range than current transformers (CT's). Rather than measure actual in-series current flow,…
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Watts Converters

For Distorted Waveshapes of All Types The success of the Valhalla 2100 series wattmeter design is centered around a four-quadrant multiplier. The significance of the four quadrant theory is to provide a proper computation for watts under any phase relation between voltage and current to ensure that indeed EI cos…
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Power Factor, Real Power, and Apparent Power

Apparent Power is the product of the rms voltage times rms current Apparent Power = E-rms x I-rms <---- also called (VA) The single phase (θ) power factor of a load is a ratio of real or true power (EI cos θ) to the apparent power (EI or volt-amperes). In…
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Benefits of Power Analysis
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Power Measurements in Inductive Circuits
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RMS, Average, and Peak Amplitude Measurements