[time-nuts] HP 5370B dropping mains voltage...

Bob Camp lists at rtty.us
Sat Jul 6 22:29:05 EDT 2013


Hi

It's a rare filament transformer that does not have fairly substantial voltage ratings on the secondary. They rated them so you could directly heat rectifiers off of them. That could / would put the full high voltage winding onto the filaments. 

Bob

On Jul 6, 2013, at 9:02 PM, Jim Lux <jimlux at earthlink.net> wrote:

> On 7/6/13 5:26 PM, Mark C. Stephens wrote:
>> The elephant in the room thing with me is SAFETY :)
>> I mean, can this be a fire hazard, what about the insulation breakdown on the secondary winding etc..
>> 
> 
> 
> Most transformers have a voltage rating on ALL windings that is greater than several times the line voltage (e.g. 600V), and most undergo some sort of HiPot test as well, at several kV.
> 
> If you're ripping the transformer out of some value engineered low cost piece of gear (like a $20 sprinkler timer), you might be worried about the LV winding. But anything sold as a standalone transformer.
> 
> 
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