ASD Document 600541 Rev. G 25 TerraSpec® User Manual
www.asdi.com Chapter 4 Fiber Optic Interface
All external fiber optic bundles on the TerraSpec spectrometer are full (i.e.,
1.7 mm diameter) bundles. They are used with the matcher fully threaded into
the body. Periodically remove the matcher to clean the internal fiber optic tip.
Note: The optimal setting for this fiber optic bundle matcher is adjusted at the ASD
factory. If the customer has ordered several fiber optic configurations, it may
be necessary to adjust this bundle matcher in order to achieve the highest
signal to noise ratio and best instrument response. Changing the bundle
matcher can effect the performance of the spectrometer.
In order to match the bundles:
1 Unlock the hex-nut bolt at the front of the bundle matcher on the
spectrometer with the 3/8 inch hex-nut driver (included with your
instrument.)
2 The TerraSpec spectrometer should be set up with the adjustment barrel
of the matcher fully threaded into the body of the matcher any time a full
1.7
mm bundle is used (this is almost always).
3 With the ASD software application (RS
3
or Indico) running and the fiber
optic cables attached, hand screw the fiber optic bundle matcher until the
optimal signal is achieved. Do not over twist the fiber optic bundle!
The optimal signal will be achieved by watching the RAW DN
(DN
= digital numbers) in the ASD application as the fiber optic bundle
matcher is being hand adjusted.
Note: The TerraSpec spectrometer should be set up with the adjustment
barrel of the matcher fully threaded into the body of the matcher
any time a full 1.7
mm bundle is used.
4 Once the optimal signal is achieved, lock down the fiber optic bundle
matcher. Tighten the 3/8 hex-nut by turning the wing nut against the face
of the instrument. Use the hex wrench to hold the 3/8 hex-nut in place
while you tighten the wing nut.
Figure 4-5 Matching fiber bundles to the TerraSpec spectrometer fiber port.
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