A little-known graph in ProVision, the RMS Waveform Capture graph, can actually be one of the most illuminating. In cases where interval graphs don't have enough detail, and raw waveform…
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Computing Event Duration With Interval Data
Although interval (stripchart) data can show cycle max and min readings, it's not normally used to get the duration of an event like a sag – waveform capture, event capture,…
Conservation Voltage Reduction with the Boomerang
Conservation Voltage Reduction (CVR) is a method for lowering peak energy demand by lowering the average system voltage during the peak periods. The Boomerang is designed to work with any…
Harmonics from Periodic Waveform Capture
Harmonics are usually recorded as interval (stripchart) data in PMI recorders. Each desired harmonic is recorded as a min/ave/max stripchart trace, for each desired voltage and current channel. Although this…
ProVision PQDIF Export
ProVision's native data file format is designed for efficient storage and access of all PQ data from the full line of PMI recorders. However, ProVision can also export certain data…
Transient Capture with the Vision and Revolution
Capture high-speed, high-voltage transients with the Revolution and Vision, using the optional transient capture system. Transient capture uses 1 MHz sampling for voltage, giving a 1 microsecond sample window, and…
Part 2 Computing Event Duration with Interval Data
Previously, a method was shown to compute cycle event durations with one minute interval data and one-second timestamps from Significant Change data. In this whitepaper, a method is given that…
Voltage Unbalance with Single Phase Boomerangs in Canvass
Canvass now includes the ability to perform voltage unbalance studies using single-phase Boomerangs. Logical groupings of three Boomerangs may be created, and treated as a single 3-phase device. This virtual…
Formulas for Power and Harmonic Measurements
PMI recorders use a variety of algorithms to compute RMS voltage and current, real, reactive, and apparent power, true and displacement power factor, and phase angle. The formulas for these…
Waveshape Triggering for Waveform Capture
A new method of triggering waveform capture in the Revolution and Vision is introduced, designed for capturing changes in power line waveform shape.
Histograms in Canvass
The Canvass Histogram is a graphical method for analysis of RMS voltage data over long time periods. Additional statistical measures are automatically derived from the histogram.