I don't know how to configure the unused channels for full-bridge connections(SC-2043 SG). Can you give a detail informaiton on how to connect it. And I try to adjust the offset nulling adjust resister, there are no input volt variation.
The bridge configuration settings are described in the SC-2043-SG User Manual starting on page 2-7.
Also, starting on page 3-7 is information regarding the offset nulling potentiometer. Note that with a 2.5 V excitation, there is only a nulling range of +-5mV. Perhaps you just didn't notice the change because it is so small?
Anyway, I hope this helps!
Russell Applications Engineer National Instruments
Dear Sir: Thinks for you help. (1)I has the SC-2043-SG user manual. I don't understand the meaning of configure the unused channel as full bridge. Is it mean that I need to connect four resister to the unused channel. (2)To the offset nulling potentionmeter, I set the input limit as +-10mV in the MAX, I think I can notice the change if there are any volt variation.
When you configure a channel for full bridge input, it is just a general purpose voltage input. (There is no bridge completion.) So no, you do not have to connect 4 resistors to your unused channels, just the excitation.
