AQ-00275-000, Rev. 3
8
Optical Alignment of the Accessory
The transfer optics of the accessory were factory aligned prior to shipping. However, it is good
practice to ensure that misalignment did not occur in transit. The following procedure can be used
to check optical alignment of the accessory.
Note: The DRA-CA-3300 was aligned with mirror M3 in the reflectance measurement position.
This mirror position is located closest to the integrating sphere. Any time mirror M3 is moved to
the transmittance or center mount position, the accessory must be realigned.
Alignment Check
You can use this procedure to check the optical alignment of your accessory without disturbing any
mirror adjustments. You will need a one inch square of translucent paper that clearly displays the
outline of the sample or reference beam when illuminated. When performing this procedure, the
accessory control cable should be disconnected from the instrument. A top view illustration of the
accessory is provided in Figure 5.
1. Load diffuse reflectance standards at the reference and sample reflectance ports.
2. Turn on the instrument and boot the WinUV software.
Note:
Do not drive instrument monochromator to zero with the detector cable connected, or
when instrument sample compartment is empty, as the increased energy at zero order may cause
damage to the detector system.
3. Darken the room and set the instrument for white light operation. White light opera-
tion can be established by booting the Align Application of WinUV, selecting the
Cary Tab and setting the following parameters:
Double Beam
Normal
Y Mode
%R
Ave Time
0.1
SBW
2
Slit Height
Full