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04-Oct-2019 02:10
First, one must appreciate that the power generation and electrical distribution systems developed for motion picture production were never designed to deal with an abundance of non-linear loads like the electronic HMI and Fluorescent lighting ballasts prevalent today.
In the past, attention was given to portable generator features such as automatic voltage regulation and speed regulation.
Harmonic noise of this magnitude can also damage HD digital cinema production equipment, create ground loops, and possibly create radio frequency (RF) interference.
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Especially, given that the increasing use of personal computers and microprocessor-controlled recording equipment in HD production has created an unprecedented demand for clean, reliable power on set at a time when the trend in lighting is toward light sources that generate dirty power.
The power waveform below left is typical of what results from the operation of a couple of 1200W HMIs with non-power factor corrected ballasts on a conventional portable generator.
