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/ > > ------------------------------------------------------------------ > 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: > http://si-list.org/wiki/wiki.pl?Si-List_FAQ > > List technical documents are available at: > http://www.si-list.org > > List archives are viewable at: > //www.freelists.org/archives/si-list > 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 > > > ------------------------------------------------------------------ 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: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list 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 ________________________________________________________________________ ________________________________________________________________________ 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 ------------------------------------------------------------------ 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: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list 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 ------------------------------------------------------------------ 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: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list 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 ________________________________________________________________________ ________________________________________________________________________ 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: > http://si-list.org/wiki/wiki.pl?Si-List_FAQ > > List technical documents are available at: > http://www.si-list.org > > List archives are viewable at: > //www.freelists.org/archives/si-list > 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 > > > ------------------------------------------------------------------ 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: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list 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 ------------------------------------------------------------------ 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: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list 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 ________________________________________________________________________ ________________________________________________________________________ ------------------------------------------------------------------------ Yahoo! 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