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5 comments
Participant

Join Date: Jan 2008
Location: Shawnigan Lake, BC Canada
Posts: 3

Common Mode Voltage Isolation

10/03/2011 8:25 AM

I have to data log a 70 mV current shunt with a common mode voltage of up to 1000 VDC. So i am looking for an isolation amplifier to isolate the common mode voltage and either produce a 1:1 signal or even amplify the such as a 1:10. I have found one so far (an Astromed product 1:1 over 1000 VDC Isolation) but it has not been CSA or UL approved (they sell so few that they have not gone to the expense to certify). Does anyone know of or have a suggestion for such a beast?

Thanks in advance.

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Guru

Join Date: Jul 2010
Posts: 554
Good Answers: 126
#1

Re: Common Mode Voltage Isolation

10/03/2011 9:19 AM

0-100mVdc input, 1200V isolation

http://www.api-usa.com/pdf/api/api4300g-4310g.pdf

The pdf shows an approval looking symbol, might have UL.

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Guru
Engineering Fields - Electrical Engineering - Been there, done that, still doing it. Engineering Fields - Control Engineering - New Member

Join Date: Dec 2008
Location: Long Island NY
Posts: 9308
Good Answers: 598
#2
In reply to #1

Re: Common Mode Voltage Isolation

10/03/2011 11:21 AM

Nice module. GA.

The one critical specification that appears to be missing from this module is the signal bandwidth of this module. The only thing I saw was an imprecise 1 millisecond fast response option (DF) but nothing on the standard module. Then again the OP never mentioned anything about the signal bandwidth so this maybe perfect for this task.

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Guru

Join Date: Feb 2006
Posts: 1775
Good Answers: 6
#4
In reply to #1

Re: Common Mode Voltage Isolation

10/04/2011 11:37 AM

Sorry!

It is single ended not for common-mode applications.

Poster shouldshould indicate the specs for the device like:

Frequency, Rise-time ....

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Participant

Join Date: Jan 2008
Location: Shawnigan Lake, BC Canada
Posts: 3
#3

Re: Common Mode Voltage Isolation

10/03/2011 10:16 PM

Many thanks, Iris. That certainly does look like it would fit the bill. I am going to give the tech rep a call and check for voltage isolation to ground, otherwise it looks like a winner.

"Half the lies they tell about me aren't true." Yogi Berra

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Active Contributor

Join Date: May 2010
Posts: 11
#5

Re: Common Mode Voltage Isolation

10/05/2011 10:34 PM

If you have 1000Vdc you should get an Isolated mV converter with Isolation of at least 2000v. I would suggest a DAT4135 with 2000V Isolation from www.Datexel.com.

Hope this helps.

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element (1); Haajee (1); Iris (1); redfred (1); SUMPI (1)

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