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Old 10-06-2010, 14:52   #31
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Originally Posted by Daedalusk View Post
I had previously done this voltage test myself, but discounted the reading as false. He says it is not false, but indicated ac leakage into the dc system from within the Freedom 30.
Interesting, an ac leakage of what current magnitude?
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Old 10-06-2010, 18:44   #32
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"occurring at a 120 Hz rate." That would seem to be a magic number, i.e. twice the 60Hz frequency of mains power in the US. But from the scope tracing it looks like the pulses are spaced every 40ms (4 large units, each five x 2ms units on the display?) which would be a rate of 25Hz not 120Hz, if I've done my math right?

"Is there a mathematician in the house?" <G>

No, really....120Hz?? or my math??
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Old 10-06-2010, 19:14   #33
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Its 2 milliseconds per vertical grid line, so about 8.4 ms per pulse which is 120 Hz. Which would go along with some kind of full wave rectification of the 60 Hz AC input. As far as the magnitude of the available current behind the spike, I would say it is very large given the small impact that large capacitor has on it. I'm sure there is some calculation that would give a numerical answer, but I don't have it.

We've already spent $500 on getting the thing repaired. Its unfortunate that I didn't do this before it failed so I could insist the repair facility ensure that ripple was within specifications. At this point I'm not sure its worth taking it out and shipping it back for what would probably be an expensive evaluation by the shop, and possibly a BS line about how it was all normal. I think the ultimate solution is a more modern unit when it fails again.

Chip
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