Datalogic Scanning XLR, HD manual Depth of Field SR

Depth of Field

Definition of a "mil"

There are currently four different range models for the scanner. Depending upon the model type of your scanner, you’ll need to hold the unit at a given distance from the bar code to achieve optimum scan- ning results. The following diagrams provide depth of field informa- tion for each of the models when scanning grade A, Code 39 bar codes: Standard Range (SR), High Density (HD), Long Range (LR) and Extra Long Range (XLR).

A "mil" is equal to 0.001 inches. In the context of the illustrations in this section, a mil represents the minimum bar code element width. Thus a 5 mil bar code would have a minimum element width of 5 mils (or 0.005 inches).

NOTE

Measurements are based on SR models set with the standard 28° scan width (as opposed to the Half Angle setting of 14°). Reference the Programming Manual for more information about the Half Angle feature.

Specifications are subject to change without notice.

Figure 7. Depth of Field (SR)

Depth of Field

Paper Labels (SR decoded model, Code 39)

SCANNER	5 mil
	7.5 mil
OF
FRONT		10 mil
			15 mil
				20 mil
						40 mil
									55 mil
			1			2			3			4				5
									FEET
0	10	20	30	40	50	60	70	80	90	100	110	120	130	140	150	160	170
								CENTIMETERS

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