Answer: When using a single ended configuration, it is important to understand that any ground currents flowing through the "analog common" line are seen as normal mode signals to your input. To help this problem, there is a sense line provided. The "sense" line allows the amplifier to bypass the noise created by ground currents in the "analog common" line.
Follow these simple instructions to optimize your configuration. 1. Connect your "analog common" to your common of the input source(your field device). 2. Connect your "sense" line to the "analog common" as physically close to your input source as possible. 3. Short all unused inputs to "analog common." (floating inputs can create noise crosstalk) 4. Use shielded cable if available. 5. Shorten your cable length if possible. (Don't use an 8' cable if 2' will work) 6. If you are still seeing noise, you may need to switch to differential mode of operation. Differential inputs are inherently less susceptible to noise.