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