Each is connected to {HEAD ~ an adjustable amplitude precision current source} of {TAIL ~ fixed frequency} and an oversampling type digital voltmeter 
Each is connected to { HEAD ~ an adjustable amplitude precision current source } of { TAIL ~ fixed frequency } and an oversampling type digital voltmeter
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH