Tape flux measurement is useful for standardizing program levels on magnetic tape records, and for measuring the performance of tapes and recording and reproducing heads. A ring-core head is the most satisfactory tape-flux measuring instrument, but calibration of the flux-to-voltage sensitivity is difficult in the general practical case. By using a -symmetrical head- construction however, the sensitivity is easily calculated and experimentally verified. For practical measurements, a -high-efficiency head- has the advantage of not changing sensitivity with wear. The flux-efficiency of the core, and the frequency- and wavelength-response factors are all calculated and experimentally verified for both the -symmetrical- and -high-efficiency- designs. A flux measurement accuracy of better than 3% is achieved.
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