Test recording currents

Test recording currents
  An ISO term.
  (7811- 2) Two test recording currents (square wave) measured at 350 % and 500 % of the reference current.
  ISO Identification Cards term. The recording current between 200 % and 220 % of the current which is required to produce the reference field at a recording density of 16,5 ftpmm (420 ftpin).

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