4 - 12 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 ParametersIf, after a scan, the abbreviation for Reflectance appears as >REF<, an errorexists in one or more of the reflectance parameters. If so, you should use thearrow buttons to review each parameter. If the abbreviation for Reflectanceappears as Ref, the symbol has no reflectance errors.Print Contrast Signal, Light and Dark ReflectanceDuring a scan, the Quick Check Verifier obtains the maximum light reflectancefrom 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 meetthese 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 rescanthe symbol.Parameter ResultPCS Pass if PCS > 75%,RL > 25% and RD < 30%Fail if not satisfiedRI/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 > .70B if > .60C if > .50D if > .40F if < .40Defects A if < .15B if < .20C if < ..25D if < .30F if > .35
