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User Guide
6
Setting the Scan Frequency
The majority of scanners are supplied with the scan frequency set to 50 Hz. LSP
scanners are set to 20 Hz.
However, you can set the scan frequency to suit your application. The scan frequency
can be set in the range 10 to 150 Hz, in 1 Hz increments, from the Landscan software.
The scan frequency can also be set via a switch in the scanner head.
6.1 Changing the Scan Frequency setting using the internal switch
CAUTION
Remove the scanner plug before removing the scanner end plate. This ensures
that the unit is electrically isolated.
Observe precautions for handling electrostatic discharge
sensitive devices
Static-sensitive parts are incorporated in the scanner.
The following tools are required:
•
5mm hexagon key
•
3mm flat-blade screwdriver (plastic).
1)
Remove the scanner interface plug. This ensures that the scanner unit is
electrically isolated.
2)
When viewed from the top of the scanner, the end plate that you need to remove
is the one nearest the scan direction arrow embossed into the scanner body. (See
Fig. 7)
3)
Remove the four M6 cap-head screws and spring washers from the end plate.
Open the scanner to access the internal circuitry.
4)
Locate the 'Speed' jumper on the right-hand side of the PCB and move it from
'External' to 'Internal'.
5)
Refer to Fig. 5 to locate the scan frequency switch. Use a plastic bladed
screwdriver to set the dial to the required mark (see to the scan frequency
table). Take care to ensure that all other components are undisturbed.
6)
Check that the end plate seal is intact and is correctly seated into the seal recess.
7)
Position the end plate, refit and evenly tighten the four spring washers and M6
cap-head screws.
LSP
Linescanner Head
HD
5FL
HD
Page 25
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