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AD620 Loadcell input

Question asked by dclm on Feb 17, 2014
Latest reply on Feb 18, 2014 by dclm

Hi,

 

I use AD620 in order to amplify my loadcell signal. I have Gain resistor of 75R. On inputs I use the following circuit.

 

ferrite.jpg

 

Ferrite Bead is 1kOhm at 100Mhz, 1.5A, 90mOhm at DC.

SCR05.PNG

My loadcell signal frequency is very slow. I have a filter at output of AD620 that has 2Hz cut off frequency. Yellow is output of AD620, Blue is Output of my filter.

 

At RF interference part of the dataheet. It suggests some resistor and capacitor values. On that equations it says that Resistor mis-match can reduce CMRR. Am I doing something wrong?

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