5-2
5 Operating the PDV
5.4 Using the Signal Level Display
The signal level display helps you to optimize the focus of the laser beam.
The signal level is shown as a bar on the display of the PDV (refer to
SECTION
5.6). The length of the bar is a measure of the amount of light
scattered back from the object under investigation.
5.5 Fixing the Focus Position
You can fix the focus by locking the focusing ring using the clamping screw.
To do so, first focus the laser beam and then hand-tighten the clamping screw
with the provided Allen key (size 1.5mm).
Figure 5.1: Clamping screw on the focusing ring
5.6 Setting Parameters via the Display
5.6.1 Philosophy
The PDV is operated via the display using the selection key and the key SET.
The main menu is shown in
FIGURE
5.2 as an example of the display.
Figure 5.2: Exsample of the display
With help of the selection key you run through the parameters on the
display in a circle.
The cursor on the left side marks the selected parameter. You configure
the parameter settings by using the function key SET. The new configured
settings will be active in time.
L a s e r s t r a h l u n g
N i c h t i n d e n S t r a h l b l i c k e n
L a s e r K l a s s e 2
N a c h E N 6 0 8 2 5 - 1 ( 2 0 0 1 )
P £ 1 m W / c w ; l = 6 2 0 - 7 0 0
n m
C l a m p i n g s c r e w
Selection key :
By using the selection key within the menus, a
parameter is selected ( ).
Key SET: By using the key SET, the setting of the selected
parameter is changed.
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