You just paid $50k for a 6669A? wow...get your money back, I'll sell you two for half that price X-P
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8 years ago
Filter cap choice for ultra low ripple
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8 years ago
When dealing with 50/60Hz transformers, tf resistance limits reservoir charge current. Then huge caps just give reduced ripple.
NT
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8 years ago
This is true for small transformers, but with any larger transformers (e.g. those requiring soft starter to protect house fuses) will see the feeding network impedance.
In addition to a large current distortion, there will also be some voltage distortion due to flattening of the voltage waveform.
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8 years ago
It's easier than typing AlwaysWrong, AW.
In 1991 it may have been.
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Sold for less than $1K. Pocket change. I spend 5 times that on Ebay every month. Must be a reason why they're going so cheap, maybe they're a POS?
Anyway, I've never worked on one.
I usually work on HP/Agilent generators, although I repaired a Marconi fairly recently. I've never seen one with a linear power supply.
Take a look in the service manual that covers the 66XX series. Module A13 is referenced as a switching power supply.
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8 years ago
When AW says "you lose" it means that he is wrong yet again.
-- John Larkin Highland Technology, Inc lunatic fringe electronics jlarkin att highlandtechnology dott com http://www.highlandtechnology.com
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8 years ago
Yeah, I guess that's why he's abandoned the thread.