A part of the signal processing circuit connected to {HEAD ~ the probe} is isolated by {TAIL ~ an isolation circuit} to secure the safety 
A part of the signal processing circuit connected to { HEAD ~ the probe } is isolated by { TAIL ~ an isolation circuit } to secure the safety
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH