Of course, in order to measure the pipe to soil potential, Vps, accurately, the signal attenuation voltage, Va, must be limited to {HEAD ~ a relatively small fraction} of {TAIL ~ the transmitted signal}, Vp 
of
Of course , in order to measure the pipe to soil potential , Vps , accurately , the signal attenuation voltage , Va , must be limited to { HEAD ~ a relatively small fraction } of { TAIL ~ the transmitted signal } , Vp
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH