[SI-LIST] Re: Digest Number 1730
- From: steve weir <weirsi@xxxxxxxxxx>
- To: pakbazf@xxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Sun, 19 Feb 2006 14:10:20 -0800
Faraydon, the mail reflector does not support attachments.
Steve
At 03:22 AM 2/19/2006, Faraydon Pakbaz wrote:
>Greetings;
>
>I am new to this. How do you post massage and attach power point slides?
>Do just respond to the massage and include the attachment or do you need
>to do it somewhere else? Thanks.
>
>Regards;
>
>Faraydon(Don) Pakbaz
>AE/TS Customer Support Engineering
>Email: pakbazf@xxxxxxxxxx
>Voice: (802) 769-5638 Tieline: 446-5638 Fax: (802) 769-5722
>
>
>
> si-list@yahoogrou
> ps.com
> To
> 02/19/2006 04:59 si-list@xxxxxxxxxxxxxxx
> AM cc
>
> Subject
> Please respond to [SI-LIST] Digest Number 1730
> si-list
>
>
>
>
>
>
>
>
>
>There are 3 messages in this issue.
>
>Topics in this digest:
>
> 1. Re: Electrical wiring questions
> From: "Mike S." <powersurf@xxxxxxxxx>
> 2. Re: Electrical wiring questions
> From: "Curt McNamara" <CurtM@xxxxxxxxxxx>
> 3. Re: Electrical wiring questions
> From: "Curt McNamara" <CurtM@xxxxxxxxxxx>
>
>
>________________________________________________________________________
>________________________________________________________________________
>
>Message: 1
> Date: Sat, 18 Feb 2006 18:13:34 +0000
> From: "Mike S." <powersurf@xxxxxxxxx>
>Subject: 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 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
> > > 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 separate
> > > PCB. I only have one 5 V power supply to power both the sensor and the
> > > ADC PCB (this card is also 5V). I believe that the best way to connect
> > > this setup is to power the ADC PCB and then, with a single connector
> > > from the ADC PCB to sensor, containing 3 pins (Vcc,GND and signal).
> > > This way would avoid ground loops. The problem is that I don't have
> > > such a connector in the ADC PCB. In fact, I only have a connector with
> > > 2 pins (Signal+ and Signal-, that are the ADC differential pins). 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 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 would have to return in the power
> > > 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?
> > >=3D20
> > > Any suggestions or comments are welcome.
> > > References like books or other publications that deal with these
> > > matters are also welcome.
> > >=3D20
> > > Thanks in advance
> > > Best Regards
> > >=3D20
> > > B. Mike
> >
> >
> > --=3D20
> > ___________________________________________________
> > Play 100s of games for FREE! http://games.mail.com/
> >
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>________________________________________________________________________
>________________________________________________________________________
>
>Message: 2
> Date: Sat, 18 Feb 2006 13:59:47 -0600
> From: "Curt McNamara" <CurtM@xxxxxxxxxxx>
>Subject: Re: Electrical wiring questions
>
>Do you have control over the PCB and sensor? Or are these purchased
>assemblies with fixed circuitry and components?
>
>If they are fixed then you are correct that a separate cable with 5V
>and GND is required. If this is the situation I would tie sensor GND
>to Signal- of the ADC PCB. This should help cancel common mode
>noise at the sensor, and simulates a "4 wire" measurement scheme.
>The connection of sensor GND to Signal- should happen at the sensor
>and not at the ADC PCB.
>
>If you have control of the assemblies consider what the RF guys do
>-- capacitively couple your signal on top of the 5V and decouple it at
>the other end.
>
> 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 information
>intended for a specific individual and purpose, and is protected by law. If
>you are not the intended recipient, you should delete this message and are
>hereby notified that any disclosure, copying, or distribution of this
>message, or the taking of any action based on it, is strictly prohibited.
>
>
>________________________________
>
>From: si-list-bounce@xxxxxxxxxxxxx on behalf of Mike S.
>Sent: Fri 2/17/2006 5:43 PM
>To: si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] Electrical wiring questions
>
>
>
>Hello to all,
>I would like to ask for some advice and orientation on electrical
>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 separate
>PCB. I only have one 5 V power supply to power both the sensor and the
>ADC PCB (this card is also 5V). I believe that the best way to connect
>this setup is to power the ADC PCB and then, with a single connector
>from the ADC PCB to sensor, containing 3 pins (Vcc,GND and signal).
>This way would avoid ground loops. The problem is that I don't have
>such a connector in the ADC PCB. In fact, I only have a connector with
>2 pins (Signal+ and Signal-, that are the ADC differential pins). 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 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 would have to return in the power
>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?
>
>Any suggestions or comments are welcome.
>References like books or other publications that deal with these
>matters are also welcome.
>
>Thanks in advance
>Best Regards
>
>B. Mike
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>________________________________________________________________________
>________________________________________________________________________
>
>Message: 3
> Date: Sat, 18 Feb 2006 14:05:35 -0600
> From: "Curt McNamara" <CurtM@xxxxxxxxxxx>
>Subject: Re: Electrical wiring questions
>
>The classic book is Ralph Morrison -- Grounding and Shielding Techniques.
>ISBN: 0471245186
>For ideas on cable shielding there is nothing better than Henry Ott --
>Noise 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 information
>intended for a specific individual and purpose, and is protected by law. If
>you are not the intended recipient, you should delete this message and are
>hereby notified that any disclosure, copying, or distribution of this
>message, 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 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
> > > 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 separate
> > > PCB. I only have one 5 V power supply to power both the sensor and the
> > > ADC PCB (this card is also 5V). I believe that the best way to connect
> > > this setup is to power the ADC PCB and then, with a single connector
> > > from the ADC PCB to sensor, containing 3 pins (Vcc,GND and signal).
> > > This way would avoid ground loops. The problem is that I don't have
> > > such a connector in the ADC PCB. In fact, I only have a connector with
> > > 2 pins (Signal+ and Signal-, that are the ADC differential pins). 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 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 would have to return in the power
> > > 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?
> > >=3D20
> > > Any suggestions or comments are welcome.
> > > References like books or other publications that deal with these
> > > matters are also welcome.
> > >=3D20
> > > Thanks in advance
> > > Best Regards
> > >=3D20
> > > B. Mike
> >
> >
> > --=3D20
> > ___________________________________________________
> > Play 100s of games for FREE! http://games.mail.com/
> >
> > ------------------------------------------------------------------
> > To unsubscribe from si-list:
> > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
> >
> > or to administer your membership from a web page, go to:
> > //www.freelists.org/webpage/si-list
> >
> > For help:
> > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
> >
> > List FAQ wiki page is located at:
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> >
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> > or at our remote archives:
> > http://groups.yahoo.com/group/si-list/messages
> > Old (prior to June 6, 2001) list archives are viewable at:
> > http://www.qsl.net/wb6tpu
> >
> >
> >
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>
>
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>________________________________________________________________________
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