34 Chapter 4
Performing Measurements
Aligning the OBR Optics
In order to perform accurate measurements, the internal optics of the OBR must be
properly aligned. The three conditions that require an alignment to be performed
are listed below.
Alignment must be
performed...
1 When the instrument is initially set up for the first time.
2 Whenever the OBR is physically moved from one location to another.
3 Whenever the indicator in the System Status Bar
is
visible.
4
To align the OBR optics
1 Ensure that the OBR unit is powered on and that the laser is on and ready.
2 Select Tools > Align
Optics
.
A dialog box appears instructing the user to disconnect devices. The user may
opt to Cancel or click OK to continue.
If OK is selected, alignment begins. A status bar shows the progress of the
alignment. When the alignment is complete, the software returns to the main
window.
3 The user must next perform a calibration, as described below.
Instrument Configuration
Before calibrating the instrument, the user should select Options > Instrument
Configuration. This calls up a dialog box (Figure 4-2) where the user can select
the maximum device length for Normal Range
measurements.
(In Extended Range
mode, selecting the maximum device length has no effect.) The user can also select
the desired resolution level.
The right side of this dialog box shows the Resultant Values, based on the length
and resolution settings. With higher resolution data, only 2 traces are available.
Length and resolution settings also determine the maximum wavelength range
available, which is also shown in this box.
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