Welch Allyn Scanteam 3700PDF, Technical Manual

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Glossary–5
Scan Rate– is the number of times a laser’s scanning beam passes through the exit
window in one second.
Scan Velocity– is the speed of a laser’s scanning beam on a target at a given distance
from the front of the scanner or rotating polygon mirror. Usually expressed in
inches/sec.
Scan Width– is the length of the widest bar code label that can be successfully
interpreted by the scanner.
Scanner– is an opto–electronic device which produces electrical signals representing the
light it detects as it “sees” a bar code.
SMT– is an acronym for “surface mount technology.”
Start/Stop Characters– are characters used at the beginning and end of a bar code label
that indicate the start and stop (end) of the label.
Trigger– is a signal input to the decoder that the scanning process should be initiated.
The actual trigger mechanisms can be a push button switch, photoelectric control,
internal object sense, proximity sensor, or multiple combinations of all of these.
Usable Scan Length– refers to that portion of the scan path for which the scanner can
accurately digitize bar code and maintain all its specifications. This length is specified
on a flat surface which is perpendicular to the optical axis of the scanner.
Volatile– refers to the characteristic of a device which loses data in memory when
power is lost or turned off.
Voltage Range– refers to the specified range of voltages over which a decoder or a
scanner can maintain all of its electrical, optical (for scanners), and environmental
specifications.
Voting– The SCANTEAM 3700PDF decodes and compares consecutive outputs from
the scanner; 3 successive reads of the same data are required for a valid read. Voting
results is a slightly slower read rate, but will reduce the probability of reading errors
when a laser scanner, especially, is being used.