The CBEMA (Computer Business Equipment Manufacturers Association) curve and the ITIC (Information Technology Industry Council) curve both refer to a similar method to visibly represent voltage events. A graph of…
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27 results in Analyzing Waveforms — Clear
Analyzing Waveforms
Spotting Loose Neutrals with Waveform Capture
A "loose neutral" in a residential location can cause equipment damage and even a house fire. An open neutral may start as a high resistance connection that shows subtle signs…
Catching VFD Failures
Variable Frequency Drives (VFDs) present unique challenges as both a source of PQ problems as well as being sensitive to incoming voltage quality. A frequent complaint with a troublesome VFD…
Understanding Crest Factor
Crest factor is an often neglected power compatibility measurement, but can be very important in certain applications. This white paper presents the definition of crest factor and the method for…
Voltage Notching Effects on Harmonic Distortion
Notching is a voltage waveform distortion resulting from short-duration high current pulses. These distortions typically present themselves graphically as a “notch” in the time domain representation of the waveform. The…
Sampling Rate in PQ Recorders
A common specification in power quality recorders such as PMI's Revolution, Guardian, or Eagle products is the sampling rate of the device. Users know this is an important number and…
Capturing Oscillatory Transients
Oscillatory transients are caused by switching operations, nearby lightning strikes, or other impulsive noise exciting electrical resonances present on the network. The most common in the distribution system is defined…
Oscillatory Transient Ring Frequency
This white paper provides details on how to estimate ring frequency caused by resonances formed between power corrections capacitors and inductive loads using ProVision. Waveform data captured using PMI's Eagle…
Advanced Waveform Capture with ProVision
Waveform Capture data is often the most detailed information available in a PQ recording. Getting good data is not always easy, so it's important to glean all information possible from…
Ring Frequency, PF and CF from Waveform Capture
With the Point Table in the Waveform Capture function of ProVision, it is possible to estimate the ring frequency, phase shift, power factor, and crest factor of a waveform.
Understanding the Harmonic Analysis Report
Harmonics are distortions in the 60Hz voltage or current caused by non-linear loads on the system. Harmonics are of interest to utilities as they can cause damage to equipment, such…
Optimizing Waveform Capture Triggering
Waveform capture is the highest resolution data available for PQ analysis and is often crucial in solving tricky issues. Successfully triggering on the waveform doesn't have to be tricky, though.…
