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Re: [TCML] Re: Dummy load for optimum cap size Experimentation



Gary,

Perhaps you could use the peak voltage for your measurement instead?  Just
need to add a rectifier and measure peak DC voltage.

-Phillip Slawinski

On Sun, Oct 3, 2010 at 14:11, Gary Lau <glau1024@xxxxxxxxx> wrote:

> I'm making slow but steady progress in my experiment to determine the best
> cap size based on using a halogen lamp dummy in place of a primary, and
> monotoring the light intensity to indicate how much power is being
> processed.
>
> I'm recording the power at 120V and at full Variac setting.  The full
> Variac
> setting is typically ~135V under load.  It changes slightly depending on
> the
> cap value, but it is what it is.  When I set the Variac to get 120V, I
> monitored the voltage with both a Wavetec 27XT DMM, and an old lab-quality
> Weston analog meter, calibrated at the 120V point with the 27XT, with 120V
> from the Variac, under no load.
>
> But when the Variac is under load from the NST, there can be a significant
> difference between the two meters (113V vs. 120V).  I'm speculating that
> this is due to the loaded Variac output waveform being distorted, and the
> two meters see this differently.
>
> I don't own a true-RMS meter, so I have to decide which of these two
> readings to believe.  I have been using the analog meter.  Can anyone
> suggest which one might be closer to a true-RMS value?
>
> Thanks, Gary Lau
> MA, USA
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