Hand Held Products 600, 800 manual Errors in Reflectance Parameters, Pcs

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

* 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.

4 - 12 Quick Check® 600/800 Series User’s Guide