Re: [TCML] Emi filter connection

[Gary Lau <glau1024@xxxxxxxxx>]

I'm not sure I understand the configuration that you're suggesting.  If you
have the mains-ground wire available at the EMI filter, you need to wire it
per Fig 3.  If you felt the need to connect the RF ground to something on
the filter, you could wire it per Fig 2 with the filter connections
reversed, although I'm not sure that the RF ground connection is
accomplishing anything useful there.

Regards, Gary Lau
MA, USA

On Wed, Mar 28, 2012 at 1:30 PM, Jeff Miller <jeffmill2@xxxxxxxxxxx> wrote:

> You are correct. I see that now
> I would like to leave the filter at the coil . I can remove the mains
> ground from the filter case then connect the rf ground to the filter case.
> I see that it is not as good as fig 3 but would that suffice ?
>
> Sent from my iPad
>
> On Mar 28, 2012, at 11:12 AM, Gary Lau <glau1024@xxxxxxxxx> wrote:
>
> > Hi Jeff,
> >
> > I put up a web page on my site about how to and how not to connect an EMI
> > filter:   http://www.laushaus.com/tesla/emifilter.htm
> >
> >> From your description, it sounds like you have your filter hooked up as
> in
> > Figure 2 on my web page, except that you connect the mains ground to the
> > EMI filter case.  This is bad, because C2 and C3 in the filter provide a
> > low impedance path for common mode RF on the NST primary to get to the
> > mains ground connected to the case.  What you want is Figure 3, so that
> you
> > have an L-C low pass filter between the NST and everything that goes back
> > to the wall.
> >
> > Regards, Gary Lau
> > MA, USA
> >
> > On Tue, Mar 27, 2012 at 9:54 PM, Jeff Miller <jeffmill2@xxxxxxxxxxx>
> wrote:
> >
> >>
> >> Hello
> >> I am second guessing my emi filter connection.
> >> my filter is located at the coil not at the variac. From my variac to my
> >> coil I run 3 wires line, neu and gnd to the filter . the ground is
> >> connected to the case of my filter and NOT to rf gnd which starts from
> the
> >> case of the nts on out. it is a 15 amp round style filter I bought off
> of
> >> eBay.  Is this ok? I am not running the filter in reverse.
> >> Sent from my iPad_______________________________________________
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> >>
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