[time-nuts] Thunderbolt - any negatives ?

Pete peterawson at earthlink.net
Fri Jun 19 19:28:39 EDT 2009


That PS is a most curious problem. For reduced leakage fields from
60Hz transformers, it was common to have a wide copper strap
wrapped around the transformer in the same orientation as the windings.
This strap was the full width of the winding bobbin, but formed a shorted
turn on the outside of the transformer to reduce, or eliminate leakage flux.

Does your tranformer have this shorted turn on it & is it still shorted?
Any chance your line setting is 100V? This would certainly run the
transformer towards saturation. Can you power that unit from a
Variac & set the voltage down enough to see the external fields
slack off?

H-P had a rather conservative limit on external fields at power line
frequeny & this was always verified during environmental testing, so
I'm quite surprised you're seeing this issue. I think something is

Pete Rawson 

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