The readhead asymmetry is determined by the method of {TAIL ~ this invention} by measuring {HEAD ~ an output voltage pulse} of the readhead, when it is excited by magnetic pulses both forward and rear of its read gap 
The readhead asymmetry is determined by the method of { TAIL ~ this invention } by measuring { HEAD ~ an output voltage pulse } of the readhead , when it is excited by magnetic pulses both forward and rear of its read gap
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH