Hi Spencer, Happy to help! 1. Yes, the electrode is commonly referred to as the Right Leg Drive electrode. So for standard 3 lead ECG systems, you are taking measurements on Right Arm, Left Arm, Left Leg, and then you have the Right Leg Drive electrode which is driving the common-mode signal. This is correct - take a look at figure 34. in the datasheet. 2. Sometimes it's helpful to measure the RLD/common-mode signal that is being applied to the patient. It can be used as a sanity check that things are enabled/biased properly. 3. Looking at figure 34... you can either generate the RLD signal as a summation of the electrode measurements using RLD_SENSP and RLD_SENSN or mid supply using RLDREF_INT. I don't have a lot of experience with EMG, so I would recommend trying out both to see which one yields better common-mode rejection. Theoretically I don't think there will be much of a difference, but I've been surprised before. Sounds like a really cool project and happy to hear that the BIOFAQ was helpful!
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