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Episodic data capture can be combined with the optical trigger
function. First setup the trigger to operate in continuous mode
at the desired wavelength and trigger level as a percent of
scale, then start the Episodic data capture. The system will
capture events pre-qualified by the trigger level. You can
select a specific number of events to record or allow it to
record until terminated by the operator.
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Optical trigger parameters:
Setup optical trigger level at a specified wavelength in
terms of absolute value or percent of scale by using the
percent symbol %. If you enter 75% as the trigger
level, then when an external event occurs, the wavelength
prescribed must reach at least 75% of the scale setting. If
you are in SCOPE mode with 4096 as the upper scaling, then
the wavelength maginitude must reach 3072 for the system
to display the event.
Setting the wavelength to zero (0) turns the trigger function
off. Also, setting the wavelength to one (1) allows ALL
wavelengths to be monitored for event trigger level.
Once an event has triggered, the display trace
will NOT update until a new trigger has qualified. You may
select SNAP to permanantly trap the spectra. This action
turns off the trigger. The spectra may now be saved to file
or printed.
The optical trigger can be used in conjunction with the
episodic data capture feature. This is a powerful data
collection tool. Additionally, when multiple channels are
enabled, each channel can be selected to have its own
wavelength and trigger level.
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Spectrometer channel enable:
Drift correct reference:
Enter the single channel reference wavelength, or enter
channel number (1-8 for multi-channel configurations).
The single channel options are "Delta" from a baseline or
"Absolute" as a zero. The wavelength selected is used to
stabilize the absorption / transmission / reflectance
measurements for single channel spectrometers. The
wavelength is carefully chosen to not have any absorption
from the sample, effectively providing a reference beam
from the light source. Any fluctuation in the light source
or sample due to temperature or otherwise will be removed.
If you have a second channel that has a similar wavelength
range, it can be setup to monitor the lamp drift. Enter
the channel number to enable dirft correct. If there are
additional computational channels, each will be corrected
by the channel you select. This assumes the other channels
use the same light source.
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