Tool/software:
Hi,
We are currently testing with the ADS1232REF board using the provided PC software to record data. In place of load cells, we are using 4 fixed 1k resistors in our wheatstone bridge configuration. With the thought to get as close to a constant output as possible and see how much noise/gain levels will affect our system before the load cells are even in place. However, while recording we see periodic error that seems to occur roughly every 20 minutes. We are running off of a 9v battery but are also connected to a laptop to record. Below is a graph of our data that ran overnight. The board is running on analysis mode, slow speed, and a gain of 128 with no averaging. We have also tried shielding our board. Thoughts on what would cause this behavior? 
