Datalogic QLM500 Manual de Instruções descarregar pdf (Página 124)

MATRIX 410™ REFERENCE MANUAL

114

7.3 MATRIX 410 655-0X0 READING FEATURES

Focus Distance

mm (in)

Field of View

(1)

mm (in)

PPI

(2)

Typical Linear Code

Resolution mm (mils)

Reading Distance

(3)

mm (in)

min.

Max.

1080

(42.52)

185 139

(7.28 5.47)

190

0.25 (10)

930 (36.61)

1310 (51.57)

(1)

@ Minimum Reading Distance

(2)

Pixels per inch @ Focus Distance

(3)

Measurement Conditions:

Test Chart: provided with the reader

Still code at the center of the FOV

Code Symbology: Code 128

Tilt Angle: 45°

Skew Angle: 15°

7.4 MAXIMUM LINE SPEED AND EXPOSURE TIME CALCULATIONS

The Exposure Time (or Shutter) parameter defines the time during which the image will be

exposed to the reader sensor to be acquired. This parameter depends heavily on the

environmental conditions (external lighting system, image contrast etc.).

In general, a longer time corresponds to a lighter image but is susceptible to blurring due to

the code movement; a shorter exposure time corresponds to a darker image.

NOTE

The following considerations must be applied only when the internal lighting

system and 2D codes are used. The Maximum line speed allowed for linear

codes or postal code reading applications heavily depends on the direction

of symbol movement. When the direction of movement is parallel to the

elements of the code, the maximum speed is greater.

Assuming:

X: Code Resolution (mm)

exp

: Exposure Time (s)

LS: Line Speed (mm/s)

The essential condition to avoid blurring effects between two adjacent elements in a dynamic

reading application is:

LS T

exp

The maximum (theoretical) line speed LS can be calculated as follows:

X / T

exp (max)

= LS

(max)

1 2 ... 119 120 121 122 123 124 125 126 127 128 129 ... 160 161

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