Format Parameters - Hand Held Products Quick Check 200 Series User Manual

[Rl:Rd xx:xx%] P (or F)
Print Contrast Signal (PCS), Light Reflectance (Rl) and Dark Reflectance
(Rd) are all "Traditional" measures of symbol contrast. PCS is based on the
reflectance of light areas, Rl and dark areas, Rd. These values are determined
using a definition of Rl and Rd as the Peak Light and Peak Dark points seen
during the scan. Thus Rl = R(max) and Rd = R(min) in current terminology. The
Traditional pass/fail criteria are PCS > 75% with Rl > 25% and Rd <30%. NOTE:
IF DURING THE MEASUREMENT OF A SAMPLE SYMBOL AN "XX" IS
DISPLAYED OR PRINTED AS A Rl, Rd or PCS REFLECTANCE VALUE, AND
"OUT OF RANGE" READING HAS BEEN MADE.THE QC200 SHOULD BE
RE-CALIBRATED AND THE SAMPLE SHOULD BE RESCANNED. Again
pressing the Scroll [<>] Button will change the display to:
[SymContr xx%] Grade
Symbol Contrast (SC) is a Graded measure of the difference between the
highest reflectance value R(max) and lowest reflectance value R (min) seen
during a measurement scan. Another press of the Scroll [<>] Button changes the
display to show:
[Rmin/Rmx xx%] Grade
Rmin/Rmx has an additional Pass/Fail (Grade "A" or "F") requirement that it be
at or below 50%. Press the Scroll [<>] Button again to get:
[Modul'n xx%] Grade
Modulation (MOD) is an ANSI graded criterion equal to Edge Contrast (min)
divided by Symbol Contrast.
[Edge(mn) xx%] Grade
Edge Contrast Minimum (Ecmin or Edge(mn)) is the minimum value of Edge
Contrast (EC) seen during a measurement scan. Edge Contrast (EC) is the
reflectance difference between an adjacent bar and space. The Pass/Fail
requirement (Grade "A" or "F" here is that the EC(min) be >15%. Another press
of the Scroll [<>] Button brings us to the final Reflectance parameter detail of:
[Defects xx%] Grade
Defects is the Graded measure of the maximum Element Reflectance Non-
uniformity (noise WITHIN any element due to spots, voids, etc.) normalized to
symbol Contrast.

Format Parameters

After a successful scan is made, detailed results in the Format Parameters area
are accessed either by first stepping through the Dimensional and Reflectance
Details as shown above or by pressing the Select [0] Button three (3) times.
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