When operating in Frequency Domain measurement mode (a power computation every 4 cycles),
the PowerMaster
®
computes the result for a four cycle interval (for example the cycles designated
by the vertical cursors above) and outputs the associated pulses starting approximately 10 ms
later. The pulses have a constant frequency of 1.2288 MHz. The number of pulses in the burst is
equal to the measured value for the previous four cycles divided by Kh. Any fractional remainder
is carried over to the next measurement period.
Using the PowerMaster Pulse Output Accurately
To get the highest possible accuracy when using the PowerMaster
®
pulse output the pulses
should be counted for precisely an integral number of seconds. This will insure that the number
of pulses counted is accurate provided that the load is stable for at least four cycles prior to the
beginning of counting and eight cycles prior to the end of counting.
Rev 1.5 157
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