[SI-LIST] Re: Electrical wiring questions

You can still do "four wire" measurements:
http://www.cirris.com/testing/resistance/fourwire.html

Here is some background info on AC coupling your signal on top
of your DC. If the signal is a DC voltage level you need to encode
it first.
http://www.davidson.com.au/products/pressure/pcb/theory/signalcond-theor
y.asp

                                                Curt

Curt McNamara. P.E.=20
Senior Electrical Engineer=20
Logic Product Development=20
411 Washington Ave. N Suite 101=20
Minneapolis, MN 55401=20
Tel 612-436-5178=20
Fax 612-672-0443=20
curtm@xxxxxxxxxxx=20
www.logicpd.com=20
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-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Mike S.
Sent: Tuesday, February 21, 2006 5:37 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Electrical wiring questions


Hello Curt,
I can't change the connectors!
Could you please explain the second idea (capacitively couple my
signal) in more detail?

Thanks for the reply Curt

Best Regards

B. Mike

On 2/18/06, Curt McNamara <CurtM@xxxxxxxxxxx> wrote:
> The classic book is Ralph Morrison -- Grounding and Shielding=20
> Techniques.=3D
  ISBN: 0471245186
>
> For ideas on cable shielding there is nothing better than Henry Ott --

> No=3D
ise Reduction Techniques in Electronic Circuits. ISBN: 0471850683
>
>                                                                  Curt
>
> Curt McNamara. P.E.
> Senior Electrical Engineer
> Logic Product Development
> 411 Washington Ave. N Suite 101
> Minneapolis, MN 55401
> Tel 612-436-5178
> Fax 612-672-0443
> curtm@xxxxxxxxxxx
> www.logicpd.com <file://www.logicpd.com>
> This message (including any attachments) contains confidential=20
> informatio=3D
n intended for a specific individual and purpose, and is protected by
law. =3D If you are not the intended recipient, you should delete this
message and a=3D re hereby notified that any disclosure, copying, or
distribution of this me=3D ssage, or the taking of any action based on =
it,
is strictly prohibited.
>
>
> ________________________________
>
> From: si-list-bounce@xxxxxxxxxxxxx on behalf of Mike S.
> Sent: Sat 2/18/2006 12:13 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: Electrical wiring questions
>
>
>
> Thanks for the replies Steve and Deniel.
> Any book suggestions?
>
>
> B. Mike
>
> On 2/18/06, dgun@xxxxxxxxxx <dgun@xxxxxxxxxx> wrote:
> > Since you are stuck with a single-ended sensor, I don't see how the=20
> > differential ADC will cancel any noise. Probably best to just use it

> > in single-ended mode.
> >
> > --
> > Daniel
> >
> >
> > > From: "Mike S." <powersurf@xxxxxxxxx>
> > > Hello to all,
> > > I would like to ask for some advice and orientation on electrical=20
> > > wiring matters! I believe this configuration is very common:
> > > I have an analog sensor with 3 wire leads (Vcc -5 V-, GND, signal)
> > > that will be sampled by a fully differential ADC that is on a
separat=3D
e
> > > PCB. I only have one 5 V power supply to power both the sensor and

> > > th=3D
e
> > > ADC PCB (this card is also 5V). I believe that the best way to=20
> > > connec=3D
t
> > > this setup is to power the ADC PCB and then, with a single=20
> > > connector from the ADC PCB to sensor, containing 3 pins (Vcc,GND=20
> > > and signal). This way would avoid ground loops. The problem is=20
> > > that I don't have such a connector in the ADC PCB. In fact, I only

> > > have a connector wit=3D
h
> > > 2 pins (Signal+ and Signal-, that are the ADC differential pins).=20
> > > So the sensor must be powered from the same power supply, but with

> > > a different cable that will not originate in the ADC PCB, but=20
> > > directly in the power supply. Since the connector to the sensor in

> > > the ADC PCB doesn't have any ground pin the sensor return current=20
> > > would have to return in the powe=3D
r
> > > supply ground wire. Although the ADC has fully differential inputs

> > >(that would cancel any induced currents in the loop) I don't think

> > >this is a good solution. Is it? =3D3D3D20
> > > Any suggestions or comments are welcome.
> > > References like books or other publications that deal with these
> > > matters are also welcome.
> > >=3D3D3D20
> > > Thanks in advance
> > > Best Regards
> > >=3D3D3D20
> > > B. Mike
> >
> >
> > --=3D3D3D20 ___________________________________________________
> > Play 100s of games for FREE! http://games.mail.com/
> >
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