wildcatherder
Member
I have an MKS 1179A Mass Flow Controller connected to a Rockwell Automation analog expansion module 1762-IF2OF2. The output from the MKS1179A feeds into a differential analog input. It is necessary to tie the signal common to the minus side, since the output from the MKS 1179A is single-ended. Unfortunately, when connected this way, I get a 0.25VDC offset on the analog input. If I remove the positive analog input lead I do not see this offset, either on the MKS output nor on the disconnected analog input.
Can someone explain why I'm getting a voltage offset and what I can do about it?
Can someone explain why I'm getting a voltage offset and what I can do about it?