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