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December 12, 2016

We are pleased to announce that Power Equipment Sales has been named as the exclusive Sales Representative Firm for Harmonics Limited Inc. in New England.

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September 19, 2016

Harmonics Limited featured in High-Profile Magazine

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Glossary Of Terms


A switching (or other) disturbance of the normal power voltage waveform that causes the voltage momentarily to go to zero. Notches often result when non-linear loads using SCRi rectifiers are powered. Called “commutation notches,” these voltage variations are usually of very short duration, but their effect on sensitive electronic equipment can be quite serious. In severe cases a voltage notch can cross the zero amplitude point and disturb the operation of timing circuits. This symptom is often referred to as “multiple-zero-crossings”. (see: Voltage; Sinewave; SCR; Sag; Interruption; Rectifier)

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