The apparatus 15 wherein said calculating means comprises {HEAD ~ operational amplifiers} configured in {TAIL ~ such a way} as to calculate said first voltage and said corrected current 
configured in
The apparatus 15 wherein said calculating means comprises { HEAD ~ operational amplifiers } configured in { TAIL ~ such a way } as to calculate said first voltage and said corrected current
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH