Yuriy RSE Posted January 31 Share Posted January 31 New USB-231. I single end mode operational only channels 0H and 2H. Drift on DC over 200 mV. All channels active. I did not expect this problem from simple unit. Link to comment Share on other sites More sharing options...
JRys Posted February 1 Share Posted February 1 Using low-impedance signal sources (signal < 100) is essential because the USB-231 inputs are multiplexed. Open channels are considered high impedance and will show drifting. Could you explain how you have the eight inputs connected? Link to comment Share on other sites More sharing options...
Yuriy RSE Posted February 2 Author Share Posted February 2 Last test was done with 9V battery. I single source mode 4 inputs was connected together with short wire. You can see difference in reading. Link to comment Share on other sites More sharing options...
JRys Posted February 2 Share Posted February 2 Your USB-231 appears to be defective. Please get in touch with your distributor for possible replacement. If you purchased directly from Digilent, please use the forum private message feature to send me your contact information and sales order number. Link to comment Share on other sites More sharing options...
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