CHAPTER 4: SOFTWARE
PQMII POWER QUALITY METER – INSTRUCTION MANUAL 4–13
4.5 Power Analysis
4.5.1 Waveform Capture
Two cycles (64 samples/cycle) of voltage and current waveforms can be captured and
displayed on a PC using the EnerVista PQMII Setup Software or third party software.
Distorted peaks or notches from SCR switching provides clues for taking corrective action.
Waveform capture is also a useful tool when investigating possible wiring problems due to
its ability to display the phase relationship of the various inputs. The waveform capture
feature is implemented into EnerVista PQMII Setup Software as shown below.
Select the Actual > Power Analysis > Waveform Capture menu item. The EnerVista PQMII
Setup Software will open the Waveform Capture dialog box.
Select the buttons on the left to display the desired waveforms. The waveform values for
the current cursor line position are displayed to the right of the selected buttons.
Numerical values are displayed directly below the button.
4.5.2 Harmonic Analysis
Non-linear loads such as variable speed drives, computers, and electronic ballasts can
cause harmonics which may lead to problems such as nuisance breaker tripping,
telephone interference, transformer, capacitor or motor overheating. For fault diagnosis
such as detecting undersized neutral wiring, need for a harmonic rated transformer or
effectiveness of harmonic filters; details of the harmonic spectrum are useful and available
with the PQMII and the EnerVista PQMII Setup Software.
The EnerVista PQMII Setup Software can perform a harmonic analysis on any of the four
current inputs or any of the three voltage inputs by placing the PQMII in a high speed
sampling mode (256 samples/cycle) where it will sample one cycle of the user defined
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