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Spectral smoothing algorithm that avoids crushing peaks. First
published in Analytical Chemistry - July 1964.
Display Persistance level 0..9
This controls smoothing for digital readout displays using
exponentially smoothed averaging. For example, spectral data
is used to compute the ChemWiz concentration for selected methods.
Average dark baseline: checked=ON
This controls the baseline average level to keep it above
zero. The algorithm computes the average dark level and makes
the average the zero baseline. Using long detector integration
times will move this level higher using "Scope mode". When
measuring fluorescence it may be desirable set this feature
off so the baseline is maintained at a real zero level.
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Temperature compensation: checked=ON
The first 30 "optical black" pixels that are read from the
detector provide a useful level of the sensor dark current
even when the detector is illuminated. If this option is on,
the system periodically samples this area and makes an
adjustment to the normal readout. When the level raises
or lowers with temperature the scan is adjusted accordingly.
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XTiming resolution control: 1/2/3
This feature provides increased optical resolutions.
Selection 1 is the lowest optical resolution and
is syncronized with the selected detector integration. In
general, if your requirements for optical resolution are
greater than 1nm, then selection 1 is ok.
Selection 2 or 3 slow the digitizer & detector clock
by a factor of 2/4 respectively. With XT levels 2 & 3 you
will be able to observe increasingly higher resolutions.
The detectors signal amplifier improves with slower thruput.
When selecting XT level 2/3 the detector integration time
must be increased to 30ms or longer to avoid sync delays.
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Episodic Data capture:
Saves spectral data over time. Allows a specific number of
episodes to be saved or can be continuous with the operator
signaling when to stop by clicking on the dark light bulb.
A time delay can be inserted between each capture. The data
can be graphed in 3d using the File -> Open function and
selecting the .ep file type. When the user specifies the file
name such as "test", then a file test.ep1 will be created. If
there are additional channels active (up to 8), additional files
will be created such as test.ep2 (up to test.ep8). Each file
contains an internal time stamp with milli-second resolution.
The .ep files are not in text format, however the data can
be extracted into text form as a time series. Use File -> Open
to perfrom the extraction of a selected wavelength over time, then
save it as a time series (.ts) file type.
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