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Low Earth Orbit
Pro AV, Staging, & Rigging
Measuring and dealing with low frequency RF / magnetic induction?
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<blockquote data-quote="Kurt Nemer" data-source="post: 23572" data-attributes="member: 425"><p>Re: Measuring and dealing with low frequency RF / magnetic induction?</p><p></p><p>I'm guessing that the winch mototr is on a variable speed drive. The drive output is a series of steps approximating a sinewave, which is probably coupling into the video. Put your scope on the motor feed and see what I mean. Does the motor AC feed run alongside the video feed? It could capacitively couple noise from the drive output into the video.</p><p> </p><p>There are filters available that are designed to clean up the output of variable speed drives. MTE Corporation may be able to suggest something, but the fiber solution is probably going to be cheaper.</p></blockquote><p></p>
[QUOTE="Kurt Nemer, post: 23572, member: 425"] Re: Measuring and dealing with low frequency RF / magnetic induction? I'm guessing that the winch mototr is on a variable speed drive. The drive output is a series of steps approximating a sinewave, which is probably coupling into the video. Put your scope on the motor feed and see what I mean. Does the motor AC feed run alongside the video feed? It could capacitively couple noise from the drive output into the video. There are filters available that are designed to clean up the output of variable speed drives. MTE Corporation may be able to suggest something, but the fiber solution is probably going to be cheaper. [/QUOTE]
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