[R-390] Possible source for isolation transformers?

[Bob Camp]

Hi

If you are going to go looking, the medical grade isolation  
transformers are by far the best. They are designed and rated for  
very low leakage currents under a variety of conditions. If you are  
really trying to isolate an R-390 that's the way to go.

Bob
KB8TQ


On Jul 4, 2007, at 5:19 PM, sdaitch at mor.ibb.gov wrote:

> I have two step down transformers, designed for 220 to 110, same  
> power rating, and about a 4 to one weight difference:
>
> Stancor GISD 1000, 1000 watts, about 32 pounds
>
> Stancor GSD-1000, also 1000 watts, about 8 pounds.
>
> One thing to remember with autotransformers, far more important
> in overseas use, stepping 220 down to 110, is if the primary
> side is not wired properly, the "low" side, rather the common side  
> of the autotransformer is actually at 220 VAC above ground.  If  
> everything is insulated properly, it might not be a real problem,  
> but it can be.
>
> 73
> Sheldon
>
>
>
>>
>> So, on that basis, true isolation transformers weigh a LOT more
>> than
>> the cheap autotransformer types.
>>
>> Ken W7EKB
>>
>
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