MAX30003 always need 3 leads, how to work with just two?

Question

When using the MAX30003WING board with 3 leads, I get clean ECG data. However, just using two leads, all I seem to get is a lot of noise. Touch the ground lead and the signal is again very good. 
 I am powering it from a battery and sending the received data over a BLE link so the unit is galvanically isolated. I've gone through the datasheet but I don't know why the ground lead should be needed for an isolated system. I was hoping to just need the two leads, but I cannot seem to get that working. Any pointers would be welcome!

GenevaC · Accepted Answer

Thank you for your inquiry. 
 Only Maxim ATE products are supported on EngineerZone at this time. Over the next several months, you will see more Maxim products being supported in EngineerZone. Please visit one of the technical support pages on our newly integrated website below for assistance with Maxim Integrated products. 
 EN - https://www.analog.com/en/support/technical-support.html# CN - https://support.analog.com/zh-CN/technical-support/ JP - https://support.analog.com/ja-JP/technical-support/)

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MAX30003 always need 3 leads, how to work with just two?

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