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Appendix L

A-30 MS-880 Industrial Long Range Scanner User’s Manual

Appendices

Appendix L — Test Decode Rate

With a Static Label

1. Position a stationary bar code in front of a functioning scanner at the scan dis-

tance used in your application.

2. Set for single scan line scanning (Top Offset setting equal to Bottom Offset).

3. Enter a <C> command to see the decodes per second.

The decode rate is the number of decoded scans per total number of scan. It will

appear at the beginning of the data strings.

Note: You can also enter a <Cp> command to see the percentage of decodes

per scans.

4. Make a note of the decode rate. You will need this when calculating the number of

decodes (see Appendix M — “Formulas for Number of Decodes” on page A-31).

5. End the test by sending the <J> command.

Number of Decodes

To ensure reliable scanning, you need to apply a minimum of five decodes to each bar

code. This means that all variables, label speed, read range, etc. are significant.

Note: Variations between labels are common. For this reason, the greater number of

sample bar codes tested, the more likely you are to achieve optimum decode rates.

In general, the number of decodes of a given bar code can be increased by:

• Increasing label height

• Decreasing label length

• Increasing scan rate (spinning mirror speed)

• Slowing label speed

• Decreasing raster sweep rate

• Decreasing raster height

With a Moving Label

Before testing with a moving label, it is highly recommended that you calculate the

expected number of decodes by using the formulas in Appendix M — “Formulas for

Number of Decodes” on page A-31.

Once you’ve mounted the scanner, established a good read rate with a stationary

label, and calculated the number of decodes for your label speed, you can begin

decoding with moving labels.

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Microscan MS-4X Manual do Utilizador Página 286