@wjcroft, here I tried the test that you suggested. With just the SRB and Channel 1 touching the microvolts approached zero. Went I touched the BIAS, it went to "Near Railed" and went haywir

What do you mean by "settle down to being railed"? The channel being railed is an unnatural situation. When the channel is connected to SRB2 and Bias, it should be "settled down".

When turning on each channel, 1 through 16, one-by-one some of the daisy channels behaved "better," though they would never settle down to the point of being railed.

trouble getting my readings to leave the "RAILED" state. Sometimes if I remove all the electrodes it will eventually settle down to a reasonable value around 1 uV RMS. Then the measurements

About try to measure other biosignal. I had already tried EMG. The signal was railed after I connected Bias line.

But, I still see very high magnitude of 50Hz . This make signal always be railed in visualizer.