Jump to content
  • 0

DC off-set in PmodIA board


Atena

Question

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

1 answer to this question

Recommended Posts

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

Archived

This topic is now archived and is closed to further replies.

×
×
  • Create New...