Over deze norm
1.1 These test methods deal with the measurement of optical properties important to automatic equipment used by the United States Postal Service, such as optical character recognition (OCR) readers and barcode readers. These test methods can be used to examine finished mailpieces bearing address information, as well as the unconverted materials intended to be subsequently used in mailpiece construction. These test methods are limited to the use of a single instrument, the U.S. Postal Service Envelope Reflectance Meter Model 2 (ERM-2), designed for use with mailpieces and materials intended for mailpiece construction such as paper and paper-like synthetics and inks.
1.2 These test methods cover examination of small areas, measuring 0.152 by 0.254 mm (0.006 by 0.010 in.). This enables measurement of the reflectance characteristics of regions as small as the inked portion of a single printed character or a single bar in a barcode pattern.
1.3 These test methods deal with the measurement of four different optical properties important to automatic mail handling, as follows:
1.3.1 Background Reflectance
1.3.2 Print Reflectance Difference and Print Contrast Ratio
1.3.3 Print Show Through
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
|Engelse titel||Standard Test Methods for U.S. Postal Service Optical Measurements for Small Areas (Withdrawn 2011)|