Harmonic Distortion Analysis
Harmonic distortion analysis measures how much of a voltage or current waveform is not at the fundamental frequency, but at multiples of it. Harmonics come from non-linear loads such as drives, rectifiers and switched-mode supplies, and they cause extra heating, metering error and nuisance tripping when they are high.
Power quality analyzers in the manufacturer's range measure harmonics over different ranges depending on the model: the GF4385 lists 2nd to 50th harmonics, the GF335 lists 2nd to 64th, and the GF334 lists 2nd to 64th. The harmonic range a model measures should be checked against the standard the measurement must follow, because a harmonic above the measured range is simply not seen.
A harmonic analysis record should state the measurement point, the load conditions, the total harmonic distortion, the largest individual harmonics, and the standard followed. A single snapshot can mislead: harmonics change with load, so record over a representative period and note what the load was doing during the recording.
Before ordering, confirm the harmonic range needed, the channel count, the recording time, and the delivery terms. Ask for the current datasheet to be confirmed in writing before ordering.
Figures on this page come from the manufacturer's own category pages, manufacturer-hosted datasheets, or a shop listing stated as such. Where the reference material does not settle a figure, this site states that it is unresolved and publishes no figure, rather than choosing one.
What to confirm before ordering
Before payment, confirm the model, the specification from the current datasheet, the quantity, the price, the lead time, and the delivery terms, in writing. Ask in your inquiry to confirm the payment terms, the trade terms, and the reply time you should expect, rather than assuming any of them. No price, minimum order or lead time figure is stated on this site.
Send an inquiry: include the model, the test or measurement requirement, and the quantity you need. Before payment, confirm the model, the specification from the current datasheet, the quantity, and the delivery terms.