MagTek InSpec 9000 - Manual (Page 62)

InSpec 9000 Encoded Card Tester
52
Figure A-5. Flux Transitions
It is important to understand the basic characteristics of magnetic tape and how they relate to
recording and readback.
Magnetic Tape Characteristics
Imagine an encode head, as it passes over a length of magnetic tape, having current “driven” into
the head wires which changes at a rate of 200 times per inch (200 flux transitions per inch -200
ftpi) at ever increasing current levels. Figure A-6 illustrates this current:
Figure A-6. Encode Current Level