Hello All,
I am currently designing an data acquisition system using TI's ADS1299 for sensing EMG signal from human body.
I have my prototype PCB ready and working as expected when powered using 6V battery.
However, when I try to power this board using 12V medical grade SMPS ( My circuits can operate with 6 to 15VDC power supply)- EMG signals show lot of noise. This noise is completely eliminated when I connect SMPS earth with my DC ground.
However, I am aware that connecting AC earth with Data acquisition system's ground can be harmful for the circuitry and especially to Human as i am sensing bio-potential here.
Can someone please explain what is the best and safest policy for grounding of SMPS powered Data Acquisition systems?
I am currently designing an data acquisition system using TI's ADS1299 for sensing EMG signal from human body.
I have my prototype PCB ready and working as expected when powered using 6V battery.
However, when I try to power this board using 12V medical grade SMPS ( My circuits can operate with 6 to 15VDC power supply)- EMG signals show lot of noise. This noise is completely eliminated when I connect SMPS earth with my DC ground.
However, I am aware that connecting AC earth with Data acquisition system's ground can be harmful for the circuitry and especially to Human as i am sensing bio-potential here.
Can someone please explain what is the best and safest policy for grounding of SMPS powered Data Acquisition systems?