The RJS Inspector Model D4000 performs the ISO/ANSI method of verification when an RJS Auto-Optic scan head is installed (ANSI mode). The D4000 performs the traditional method of verification when a laser scanner is installed (laser mode). This document is intended to describe the verifier’s standards of compliance in each mode of operation.
The calibration plaque supplied with the Inspector D4000 is RJS part number 930-08. The plaque’s 660 nm (red) reflectance values are traceable to the Applied Image Primary Verification Calibrated Standard per ANSI X3.182 Step Reflectance Chart (see note 2).
The 925 nm (infra-red) calibration plaque reflectance values are traceable to RJS standards developed between 1975 and 1978 for the initial Autoscan product.
ANSI Mode; Verification Method Compliance
The RJS Inspector D4000 gathers data and performs all ISO/ANSI method parameter calculations per the ISO/IEC 15416 and ANSI X3.182-1990 methodologies with special considerations and exceptions described in a following section. The Inspector D4000 also conforms to ISO/IEC 15426 per the requirements specified in Section 2.
No optical correction algorithms are incorporated in this system. One RJS proprietary calculation correction algorithm is incorporated to provide a more accurate and consistent Decodability calculation for manual scanning. This algorithm produces maximum accuracy for Decodability when a symbol is scanned in both directions during a multiple scan analysis.
The optical configuration meets all aspects of the X3.182-1990 requirements.
The four round apertures used for the ANSI verification method are each physically inspected and measured to be within +/- .0004 inch of their intended diameter sizes when in the final optical configuration.
Final system test is performed by scanning a set of test symbols that are traceable to Applied Image U.P.C. Primary Verification Standard (per ANSI X3.182) calibrated at 660 nm and 6 mil aperture (or 5 mil depending on the scanner model being tested.) All calculated parameters are confirmed to be within +/- 4 % of all target parameters marked on the symbols (see notes 1 and 2).
ANSI Mode; Special Considerations and Exceptions
Average bar deviation is displayed in a proprietary graphic format in units of % of tolerance. It meets the intent of providing a print trend for ink spread with the additional advantages of providing a high resolution format that enables meaningful warning and reject messages based on published traditional tolerance specifications.
Except for when an AIAG subsymbology is enabled and a Code 39 symbol is analyzed, the unit displays all individual ISO/ANSI parameter averages in letter (A through F) format. The unit always displays the overall symbol grade in both letter and numeric format.
Laser Mode Using CR1 Scanner
Laser Mode; Average Bar Deviation Calculation Compliance
Digital data received by the scanner (see note 1) is used to calculate Average Bar Deviation and the ISO/ANSI method Decodability calculation. This is the basis for all bar code element measurements provided by this verifier model.
The D4000 laser mode average bar deviation analysis is traceable to the average bar deviation calculated by an RJS Inspector 4000 ISO/ANSI method verifier. This makes the laser mode traceable to the ANSI method of element width calculations (which are also used in the Inspector 4000 to calculate the ISO/ANSI method Decodability parameter.)
A reference symbol is included on the bar code test sheet supplied with each Inspector Model D4000 with laser scanner. The reference is created by scanning the symbol with a calibrated Inspector 4000 and then marking the symbol with the location of the “A” in the Inspector 4000 average bar deviation graph display.
The ANSI method Decodability calculation is traceable to the Calibrated Conformance Standard Test Card for EAN/UPC Symbol Verifiers.
Final system test includes two steps for ensuring accuracy:
Scanning a reference symbol and ensuring the placement of the “A” is calculated to be within +/- one (1) location marked on the reference. This equates to approximately +/- 21% accuracy between all Laser Inspectors for average bar code deviation calculations.
Scanning the Decodability (BAR) symbol on the Calibrated Conformance Standard Test Card at the proper distance and angle and ensuring the Decodability calculation is within +/- 4 % of the NIST traceable value marked on the card.
The Inspector Model D4000 can be set up to be calibrated to practically any reflectance standard in ANSI mode. High and low calibration reflectance target values for both the red and infra-red light sources are user programmable via menus.
Applied Image certified Calibration Standards are manufactured to Applied Image, Inc. and Uniform Code Council, Inc. specifications, using ANSI X3.182-1990 methodology, and are calibrated using standards traceable to the National Institute of Standards and Technology (N.I.S.T.)
Laser mode does not require any calibration or adjustments. The laser scanner is screened for digitizer accuracy to be within acceptable tolerances for bar width deviation measurements and ANSI method Decodability calculations.