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Installation & Setup 2-13
Note: Do not let the verifier’s beam stop on a bar code when logging
data, because it logs unwanted data.
Bar Code Travel Speed Considerations
A bar code should be present in the beam for at least five scans for most
reliable operation. The verifier performs a minimum of 100
scans/analyses per second. At that rate, each analysis is accomplished in
10 milliseconds max. Therefore, a bar code must be in the beam for at
least 50 milliseconds to be reliably analyzed.
Parallel Bar Code Direction
In parallel bar code (picket fence) travel direction, a bar code is in the
laser beam throughout the height of the shortest bar in the code. An easy
way to estimate the fastest speed the code can travel through the beam
is to divide the height of the shortest bar in the code by the maximum
time required for the verifier to take five scans of the code.
Example: Calculate the maximum travel speed where the shortest bar
height in a code is .5 inches and the verifier being used performs a
minimum of 100 scans/analyses per second. Five scans requires 50
milliseconds (.05 seconds) to gather, so .5 inches (bar code height)
divided by .05 seconds (time needed to gather 5 scans) = 10
inches/second. Therefore, the maximum speed the code can travel
through the beam is 10 inches per second.
Non-Knife Setup
Aim beam onto white line