Xerox 6180N Generic MICR Fundamentals Guide - Page 104
that exceeds specifications.
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Quality control The following table identifies the signal level tolerances for all of the MICR characters. These standards are required by ANSI standards; tolerances for other standards might vary. Table 6-1. Signal level tolerances Character 0 1 2 3 4 5 6 7 8 9 dash transit amount On-Us Peak number 1 2 1 1 3 1 5 1 4 1 3 and 5 3 1 and 5 3 and 5 Minimum (50%) 78 51 63 51 63 63 63 45 63 99 40 63 42 60 Nominal (100%) 130 85 105 85 105 105 105 75 105 165 67 105 70 100 Maximum (200%) 260 170 210 170 210 210 210 150 210 330 134 210 140 200 Example: A dash symbol has a nominal signal level of 67. If a signal level reading of 65 is taken of this symbol, the result would be 97% ((65 ± 67) x 100 = 97%), which is an acceptable specification range. Distortions of the waveforms can be caused by a MICR character that is noticeably skewed, by extraneous ink spots, or by a void that exceeds specifications. The following figure shows a graphic display of the magnetic footprint for each MICR character. The number above a waveform peak is the nominal signal strength value. The waveforms shown here are for ideal characters. 6-18 Generic MICR Fundamentals Guide