Hi Harold. May I send you a question off list? Also, when you talk about
neutral currents, do you mean current between neutral and ground?

Josh

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Harold M Hallikainen wrote:
>
>         Yahoo returns a page not found error on that link. These are not in
> harsh industrial environments. Even in such environments, if you are
> measuring pots on the board, I  think noise pickup would be minimal. It's
> wires leaving the board that do a great job picking up noise. I DO filter
> everything leaving a board.
>         On schematics and stuff...  They pay me real money to design this stuff,
> so I don't think I should give away the designs. I'm certainly happy to
> discuss the designs, though. I do plan on adding an "Engineering
> Department" page to the website. I'll get into some discussion of phase
> control dimming, DMX, etc. My wife just gave me an Etch A Sketch for my
> birthday. She's really good at using it. I hope to have her draw some
> waveforms for inclusion on the page (complete with the Etch A Sketch red
> background, the knobs, etc.) Should be fun!  Meanwhile, I DID add stuff
> on a presentation on neutral currents with phase control and GFCI's I did
> at LDI. Look under Application Notes at http://www.dovesystems.com .
>
> Harold
>
> On Mon, 12 Nov 2001 10:15:17 +0200 Vasile Surducan
> <vasile@L30.ITIM-CJ.RO> writes:
> > And which kind of signals have you measured ?
> > Are your devices working in harsh industrial environement like this
> > one:
> >
> > http://www.geocities.com/vsurducan/micro/micro.htm
> >
> > Harold, your devices look great, I've saw your site. Prity bad you
> > don't
> > say nothing about how it works ( schematics, sample codes etc...)
> > Best regards,
> > Vasile
> >
> > On Fri, 9 Nov 2001, Harold M Hallikainen wrote:
> >
> > > On Fri, 9 Nov 2001 14:35:14 +0200 Vasile Surducan
> > <vasile@L30.ITIM-CJ.RO>
> > > writes:
> > > > Datasheet say 10K. But reality show you need to minimize the ac
> > noise
> > > > impedance by adding a capacitor near AD input and analogic
> > ground.
> > > > Value must be set accordingly input signal variation and maximum
> > > > delay
> > > > ( Rpot x C ) you must have it.
> > > > Vasile
> > > >
> > >
> > >         Why? I've got lots of stuff with a 10K pot driving the A/D
> > input
> > > directly with no capacitor and get no jitter in the A/D output. If
> > you
> > > have a reasonable PCB layout (good ground plane), it seems this
> > capacitor
> > > is just wasted money. And, if you do external multiplexing, slows
> > > everything down.
> > >
> > >
> > > Harold

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