Manual No. 25-ULPNR102-01; Mar, 2005 LMD 1135 Laser Fixed Mount Scanner
Page 10
3) Quality Bar Code Labels
The quality of the bar code label can affect the scanning performance. Poor quality labels are more
difficult to decode and may result in non-reads or potential misreads. The bar code label should be
printed to specifications. This means that the bars are printed within spec, with the correct widths, no
ink spread, crisps edges and no voids. There should be a sufficient quiet zone on both end of the bar
code label. For best results, the paper or label stock should have a matte finish to diffuse light. The
print contrast signal (which is a comparison of the reflectance of the bars and the background stock)
should be as high as practical.
Measuring Scanner Performance
A method for properly positioning the unit is to program the scanner for Trigger Disable (S7) and
Continuous Read (S2) modes. The scanner will be always on and will continuously read the same bar
code. Since the buzzer sounds each time the bar code is read, the sound of the buzzer can be used like
a “Geiger counter”. As the position of the scanner changes the sound of the buzzer will change. The
buzzer sound will be loudest and most continuous at the best reading position.
