Xerox 6180N Generic MICR Fundamentals Guide - Page 89
Magnetic testing equipment
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Quality control Small Optical Comparator The Small Optical Comparator also compares the MICR printing to industry standards (see the following figure). Its main difference from the MICR Gauge is that the Comparator's nominal 8x to 12x magnification and built-in measuring scales enable you to measure printing characteristics that require greater precision. Measures character-to-character spacing Measures spots and deletions Measures character size Measures character-to-character vertical variation: measures skew Figure 6-2. Small Optical Comparator Magnetic testing equipment Each MICR symbol and character has an ideal waveform and nominal signal strength. Every MICR printing technology modifies the waveform from the ideal in a different way, so that the nominal MICR signal varies somewhat among the characters and symbols. These are characteristics of the printing technology and font design, and cannot be adjusted in Xerox MICR printers. For this reason, the signal strength of the On-Us symbol is used as the Xerox reference for the entire MICR line. Generic MICR Fundamentals Guide 6-3