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4.5.3
Trace Memory
4–14
parameter. EnerVista PQMII Setup Software then takes this data and performs a FFT (Fast
Fourier Transform) to extract the harmonic information. The harmonic analysis feature is
implemented into EnerVista PQMII Setup Software as shown below.
Select the Actual > Power Analysis > Harmonic Analysis >
Harmonic Spectrum menu item.
The EnerVista PQMII Setup Software can display the Harmonic
Analysis Spectrum window including the harmonic spectrum up to and
including the 62nd harmonic.
Enter the trigger parameter for the Select Trigger setting.
Click the Select button for the Trigger setting.
The Waveform capture window will appear.
To display the harmonic spectrum, click the Harmonics button (
on the top of the screen.
The window includes details of the currently selected harmonic and other
harmonic analysis-related data (for example, THD, K Factor, etc.).
Select Read Last Trigger From Device to load previous acquired
spectra from the PQMII.
The trace memory feature allows the PQMII to be setup to trigger on various conditions.
The trace memory can record maximum of 36 cycles of data (16 samples per cycle) for all
voltage and current inputs simultaneously. A Total Trace Triggers Counter has been
implemented in the PQMII Memory Map at Register 0x0B83. This register will keep a
FIGURE 4–3: Harmonic Spectrum Display
PQMII POWER QUALITY METER – INSTRUCTION MANUAL
CHAPTER 4: SOFTWARE
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