Hand Held Products IT4X80 manual Parameter Interpretation, Average Bar/Gap Width, Code Symbologies

Note: For the Canadian and Australian 4-State symbologies only, any bar error that has invoked their error correction triggers an additional PQA parameter line:

"[F] < One or more Bars are in Error!" in a Full Report or "One or more Bars are in Error!" in a Screening mode.

Table 1: Dimensional Tolerances for the Various 4-State Bar

Code Symbologies

	“Tall” Bar	“Short” Bar	Bar Widths	Gap (Space)
	Extensions	Extensions”		Widths
British	2.16 - 2.92 mm	0.51 - 0.76 mm	0.38 - 0.63 mm	0.50 - 0.87 mm
Netherlands	2.16 - 2.92 mm	0.51 - 0.76 mm	0.38 - 0.63 mm	0.42 - 0.89 mm
Canadian	2.1 - 2.50 mm	0.25 - 0.40 mm	0.40 - 0.60 mm	0.40 - 0.76 mm
Japanese	1.70 - 1.80 mm	0.52 - 0.68 mm	0.50 - 0.70 mm	0.45 - 0.60 mm
Australian	2.10 - 2.90 mm	0.50 - 0.80 mm	0.40 - 0.60 mm	0.40 - 0.76 mm

Parameter Interpretation

Average Bar/Gap Width

Average Bar or Inter-Bar Gap Widths are the average of such dimensions mea- sured across an entire postal symbology. A low average bar width or inter-bar gap width grade indicates print conditions that expand or shrink the apparent size of the dark elements, threatening to make the narrow bars or spaces disap- pear. Potential areas of correction include adjusting the print process (e.g., ink flow, transfer heat, print speed), adjusting the original bar code symbol graphic or pattern (through techniques such as undercutting), or by making the symbol larger.

Average (Bar) Height/Extension Height

Average Height/Extension Height is a measure of the average height of the bars or dark elements in a symbol. Depending on the symbology and print process, this can be corrected by graphically stretching the symbol for 2D stacked sym- bols (see "Row Height" on page 1-19 and "Useful Row Height" on page 1-19), or may be an indication that the symbol generating program, in the case of the postal symbologies, does not meet the required specifications.

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