Re: [TCML] Variac Phase Shifting Info please

[Gary Lau <glau1024@xxxxxxxxx>]

Hi Paul,

When you described feeding a function generator into the Variac, but failed
to see any phase shift - are you sure that you wired the Variac as a
2-terminal variable inductor, feeding the capacitor?  It should work
regardless of the magnitude of the applied voltage.  If the Variac was
wired conventionally as a 3-terminal variable transformer, then it probably
would not work.

Regards, Gary Lau
MA, USA

On Thu, Jan 19, 2012 at 11:35 AM, Paul Walsh <jam.jar@xxxxxxxxxxx> wrote:

>
> Hi Gary
> Thanks for the info. Much appreciated. I did a bit of testing last week to
> see if I could get some phase shift using my 10A variac. I used function
> generator on my oscilloscope to feed a 50Hz signal into the variac (about
> 5v peak) and compared input and output on channel 1 and 2 of the scope.
> Couldn't see any phase shift as I rotated variac knob, is that because of
> small test voltage? I would love to know (in very simple terms please) how
> the variac achieves the phase shift.
>
> Thanks again
> Paul
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