Nov 12, 2018 | Articles, Fundamentals of Power Management
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...
Nov 12, 2018 | Articles, Fundamentals of Power Management
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...
Nov 12, 2018 | Articles, Fundamentals of Power Management
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...
Nov 12, 2018 | Articles, Fundamentals of Power Management
The AC power drawn from the source (e.g. line – 120VAC @ 60Hz 220VAC @ 50Hz) is the integral over one cycle of the instantaneous watts values. As shown in figure C, during a portion of each cycle power is used by the inductive device (e.g. electric motor), while...
![RMS, Average, and Peak Amplitude Measurements]()
Nov 12, 2018 | Articles, Fundamentals of Power Management
When describing the amplitudes of electronic devices, terms such as “volts RMS” or “amperes RMS” are used. The RMS (root mean square) of a sine wave produces the same “heating effect” as an equivalent DC voltage level. (i.e. 5...
