Microscan MS-810, User Manual

Page: 117 / 144

Number of Scans
MS-810 Industrial Scanner User’s Manual
A-19
Appe
ndices
Angled Picket Fence Calculation
The number of complete scans for
angled picket fence is calculated the
same as that for picket fence, with the
exception that the scan width is short-
ened in proportion to scan tilt.
Improving the Number of Scans
After changing any of the parameters described in this section recalculate the number of
scans (see “Number of Scans” on page A-18 ) and do Step 1, “Test Decode Rate
with Moving Label” on page 1-10 .
Scan Rate
Scan rate is a function of motor speed and is adjustable in the Scanner Setup menu
from 300 to 800 scans per second. A slower scan rate may allow greater label range
and/or higher decode rates, but at the cost of fewer scans per label. To adjust the scan
rate (motor speed), see Factory Settings in the Setup menu.
Definitions
• Scan Rate (SR) is the number of scans per second that a given scanner is capa-
ble of emitting.
• Scan Width (SW) (picket fence formula only) is the width across the scan beam,
at a given distance from the scanner, in which a label can be read.
• Label Speed (LS) is the distance per second
that a label moves as it travels through the
scan lines.
• Label Length (LL) (picket fence formula only)
is the length of the longest printed label to be
read plus the length of the quiet zones (
Fig-
ure A-7 ).
• Label Height (LH) (ladder formula only) is a
measurement of the height of individual bars
(
Figure A-7 ).
Note
: Be sure to use a common unit of measurement when gathering data on
scan width, label speed, label length, and label height.
Direction of label travel
Label
Scan line
Scan width
Label
placement
area
Figure A-6 Angled Picket Fence Orientation
Quiet zones
Label
height
Label length
Figure A-7 Label Dimensions