Atena Posted December 22, 2017 Share Posted December 22, 2017 Hello, Is there any way to remove the DC bias from the excitation signal of PmodIA? I want to use the board for measuring the impedance of a liquid and it is important the excitation signal does not have any DC bias to avoid electrochemical reactions. Thanks a lot in advance for your help! Atena Link to comment Share on other sites More sharing options...
JColvin Posted December 22, 2017 Share Posted December 22, 2017 Hi @Atena, You could remove the DC bias from the excitation signal by AC coupling the signal. However, the signal returning to the Pmod IA must be within the linear range of the internal ADC (0V to Vdd) as per page 15 of the datasheet. I don't know what liquid you are analyzing and how sensitive it is, but if the liquid is not subjected to any other voltage levels it may not be a problem, but that is not my field of expertise. In the end, it may be good if you contacted Analog Devices for their advice since their datasheet provides some details about measuring impedances in various liquids. Thank you, JColvin Link to comment Share on other sites More sharing options...
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Atena
Hello,
Is there any way to remove the DC bias from the excitation signal of PmodIA? I want to use the board for measuring the impedance of a liquid and it is important the excitation signal does not have any DC bias to avoid electrochemical reactions.
Thanks a lot in advance for your help!
Atena
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