[Boatanchors] [T-368_BC-610] FS: KW Isolation Transformer

[Michael Bittner]

The thing you are missing is that there is capacitance between the windings 
of a transformer and between the windings and its case.  AC is impeded but 
not stopped by a capacitor.  Mike, W6MAB
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----- Original Message ----- 
From: "Rob Atkinson" <ranchorobbo at gmail.com>
To: "Francesco Ledda" <frledda at att.net>
Cc: "Boat Anchors List" <boatanchors at mailman.qth.net>
Sent: Friday, October 16, 2015 5:08 PM
Subject: Re: [Boatanchors] [T-368_BC-610] FS: KW Isolation Transformer


> When I got home from work I did an experiment.   I plugged in an
> isolation transformer to a wall outlet (my line v. is up to 128 v.
> now!) and got out my Fluke 115 and measured 128 v. from one end of the
> secondary to the other.  I put the fluke on the "hot" side of the
> secondary and the outlet box metal ground and measured about 82 v.  I
> measured my body resistance from one hand to the other as about 1.5
> megohms.  Then I held the fluke probe connected to the isolation
> transformer secondary "hot" and put my other hand on the outlet box
> and saw the v. on the meter drop from about 82 v. down to 17.  But I
> felt no current through my body at all.  So evidently I am mistaken
> but I don't know why I didn't feel any current when the v. dropped so
> much.   Well, I guess 65 v. / 1500000 ohms is a very small amount of
> current, too small to feel.  The 1:1 isolation transformer must
> provide only the current the load uses and no more.   That is the key
> thing I was missing I think.
>
> 73
>
> Rob
> K5UJ
>
> On Fri, Oct 16, 2015 at 11:48 AM, Francesco Ledda <frledda at att.net> wrote:
>> A transformer will have the secondary floating respect to your home 
>> ground;  therefore, touching one terminal and ground will not have a 
>> current path.
>>
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