Microscan MS-890 User Manual page 290

Test Read Rate
Test Read Rate by ESP
See Read Rate in Chapter 12, Utilities.
Test Read Rate with a Moving Symbol
Before testing with a moving symbol, it is highly recommended that you calculate the
expected number of decodes by using the formulas in Appendix K,
of Decodes on page A-27.
Once you've mounted the scanner, established a good read rate with a stationary symbol,
and calculated the number of decodes for your symbol speed, you can begin decoding
with moving symbols.
Number of Decodes
To ensure reliable scanning, you need to apply a minimum of five decodes to each symbol.
This means that all variables, symbol speed, read range, etc. are significant.
Note: Variations between symbols are common. For this reason, the greater the number
of sample symbols tested, the more likely you are to achieve optimum decode rates.
In general, the number of decodes of a given symbol can be increased by:
• Increasing symbol height
• Decreasing symbol length
• Increasing scan rate (spinning mirror speed)
• Slowing symbol speed
• Decreasing raster sweep rate
• Decreasing raster height
A-26
MS-890 Industrial Automation Scanner User Manual
Formulas for Number