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If you have both the Main Output and the Power Analyzer input displayed, the Main window should
display both waveforms, as illustrated in the following screen shot.
Making a Voltage Phase Difference Measurement
The voltage phase difference measures the phase difference between the output of the ac source and the
output of a UPS after ac power is restored following an ac line dropout. This measurement requires that
the output of the UPS be connected to the Power Analyzer input. Also, you must have already measured
and displayed both the ac source output and the UPS output waveforms in the Main window.
To access the Voltage Phase Difference measurement, go to the Tests menu and select the Voltage
Phase Difference command.