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PSoC 5, 3 & 1 MCU

Anonymous
Not applicable
‎Dec 21, 2015 01:02 AM

PSoC3 Op-Amp with strain gauge problem

Hello everyone,

   

I'm designing system conditioning for a strain gauge transducer, I want a gain of about 200. the transducer power (Excitation voltage) I use from the PSoC itself of about 5 volt the output of the strainguage is connected to an Op-amp using different power options.

   

The problem is that when I use voltage from the VR for instance everything is alright but when I connect the output terminal of the transducer the voltage across them change and the output become fixed no matter I change the strain of the transducer.

   

Please assist.

   

maxdamage.

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Anonymous
Not applicable
‎Jan 06, 2016 12:02 AM

Re: PSoC3 Op-Amp with strain gauge problem

Hi,

   

You will need differential measurement. Please refer to this article.

   

http://www.cypress.com/file/104761/download

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