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Quick Check® 600/800 Series User’s Guide
* For UPC, the minimum P.C.S. varies depending on the measured R-Max.
Errors in Reflectance Parameters
If, after a scan, the abbreviation for Reflectance appears as >REF<, an error
exists in one or more of the reflectance parameters. If so, you should use the
arrow buttons to review each parameter. If the abbreviation for Reflectance
appears as Ref, the symbol has no reflectance errors.
Print Contrast Signal, Light and Dark Reflectance
During a scan, the Quick Check Verifier obtains the maximum light reflectance
from spaces (Rmax or RI) and minimum dark reflectance from bars (Rmin or Rd).
The print contrast signal, “P.C.S.,” is a traditional measure of print contrast.
PCS= (R[L]-R[D]/R[L]. The traditional pass/fail criteria are PCS, 75% with RI >
25% and Rd < 30%.
The traditional parameters are rated OK! or pass if the PCS, RI and Rd meet
these criteria. If a value does not meet the criteria, the Ref parameters fail (LO!).
If the PCS, RI or Rd values appears on the display or on a printout as “XX” or “—
—,” the reading is out-of-range. You should recalibrate the unit and then rescan
the symbol.
Parameter
Result
PCS
Pass if PCS > 75%,RL > 25% and RD < 30%
Fail if not satisfied
RI/Rd
Pass if Rd/RI < 50%
Fail if Rd/RI > 50%
SymCont
A if > 70%
B if > 55%
C if > 40%
D if > 20%
F if < 20%
Edge contrast (min)
A if > 15%
F if < 15%
Modulation
A if > .70
B if > .60
C if > .50
D if > .40
F if < .40
Defects
A if < .15
B if < .20
C if < ..25
D if < .30
F if > .35
Содержание Quick Check 600 Series
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Страница 120: ...Hand Held Products Inc 700 Visions Drive P O Box 208 Skaneateles Falls NY 13153 0208 QC600 800 UG Rev G 3 07 ...