ASD Document 600541 Rev. G
51
TerraSpec® User Manual
www.asdi.com
Appendix B Reference Information
B.1.4
How often do I need to optimize?
Optimization has no affect on the data unless the measurement has drifted
towards saturation, in which case optimization is mandatory. The RS
3
application provides a saturation warning.
B.1.5
How often do I need a (baseline) White Reference?
Inside Use or Constant Lighting Conditions
When using the instrument inside under constant lighting conditions or when
using an accessory with its own light source, collect a (baseline) white
reference every 10 to 15 minutes while the instrument is warming up and then
every hour or so thereafter.
Outside Use
When using the instrument outside, you should collect a new white reference
frequently for:
•
temperature changes
•
accessory changes (like switching probes)
It is important that the light intensity is the same for when the white reference
is collected as for the measurements of the sample.
B.1.6
What spectrum average (or sample count) should I use?
When used with the Hi-Bright MugLite or Contact Probe, it is usually
sufficient to use 30 scans in the spectrum averaging for the sample and 60
scans for the white reference. The white reference isn’t taken as often, which
is why you would want to include more scans in its averaging.
The signal-to-noise measurement increases with the square root of the number
of scans used in the averaging.
Note:
The actual spectrum average will be a compromise between noise reduction
through spectra averaging and the time required for each spectra collection.
For instance, if you are using the instrument in the field to measure a large
number of samples, you will want a smaller number of spectra in the average
to decrease the collection time required. If you are collecting spectra in the
lab, you’ll want to increase the number of spectra in the averaging to obtain
the cleanest spectra possible.
B.1.7
What if I want to keep the same settings all day?
Even if you could keep the same settings for the integration time, gain value,
and offset value for the entire day, you probably wouldn’t want to.
Summary of Contents for A100800
Page 1: ...TerraSpec User Manual ASD Document 600541 Rev G 2008 by ASD Inc www asdi com ...
Page 6: ...ASD Document 600541 Rev G vi TerraSpec User Manual www asdi com ...
Page 10: ...ASD Document 600541 Rev G x TerraSpec User Manual www asdi com Notes ...
Page 20: ...ASD Document 600541 Rev G 10 TerraSpec User Manual www asdi com Chapter 1 Introduction Notes ...
Page 44: ...ASD Document 600541 Rev G 34 TerraSpec User Manual www asdi com Chapter 5 Batteries Notes ...