B.1.16 What Can Cause More Noise In My Data From Last Time; Why Does The Vnir Drop To Zero After A Dark Current Collection; How Do I Collect A Reference With A Spot Size Larger Than The Spectralon Panel; B.1.19 How Do I Set Up Gps - ASD FieldSpec 3 User Manual

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B.1.16 What can cause more noise in my data from last time?

B.1.17 Why does the VNIR drop to zero after a Dark Current
collection?
B.1.18 How do I collect a reference with a spot size larger than
the Spectralon panel?

B.1.19 How do I set up GPS?

To configure the GPS:
Step 1
ASD Document 600540 Rev. J
Many factors can cause noise in your data from one session to another. Noise
in a measurement is related to the instrument, the signal level, and noise in the
light source. Many times the appearance of noise is actually a decrease in the
strength of the signal, as opposed to an increase in noise.
Under normal operating conditions, noise visible in a spectrum is always the
result of a trade-off between the inherent noise in the system and the signal.
The angle of the sun at high noon in the Fall has a reduced light level than at
high noon in high summer. Likewise, the time of day and the sun's position
affects light levels, as well as atmospheric conditions.
Also, broken fibers in the fiberoptic cable can contribute to noise. Perform a
fiberoptic check to verify.
An increase in noise can be due to a problem in the instrument such as an
electronic component malfunction or a grounding problem. This will many
times be indicated by a regular pattern to the noise or periodic bursts of noise
that are visible over the normal spectra.
When the VNIR drops to zero after a Dark Current has been collected, this
may indicate a problem with the VNIR shutter or Dark Current collection
routine. To verify, optimize the instrument and listen for the click of the
shutter activating. If you do not hear the shutter click, contact technical
support and obtain an RMA for sending the instrument in for repairs.
Purchase a bigger reference panel or move the sampling accessory closer to it.
If you are indoors using artificial light, make sure that the distance and angle
from the reference is the same as will be used for the sample.
If you are outdoors and the sun is your light source, it is okay if your reference
panel is closer to the foreoptics and the sample is farther away.
The GPS feature is enabled in the RS
Select either:
86
Appendix B Reference Information
3
application software.
FieldSpec® 3 User Manual