BUCHI NIRWare - Manual (Page 175)

NIRWare 1.5 Software Manual NIRWare Suite
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Manual: The gain specified manually in 'Gain of ADC Detector for samples' is used for all
sample measurements. Increasing gain levels: 0,1,2,3,4
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Auto: The optimum gain is determined automatically for each sample before the
measurement. One scan is performed prior to every sample measurement and the gain is
automatically determined afterwards. Individual spectra of one measurement sequence can
have different gain settings.
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Optimized: With these settings an optimized sample gain for the next measurement
sequence is determined. The number of samples used to calculate the optimized level can be
set in the field “Optimized sample gain: Number of samples. Additionally, the field “Optimized
sample gain: Determine best gain before the next measurement” has to be checked. After the
next measurement the checkmark is automatically removed and the gain that had been
determined can be seen in the field “Gain of ADC Detector for samples”. (For that purpose the
application has to be closed and reopened in the Management Console.)
Fiber Optic SMA
The Fiber optic SMA offers some unique settings.
Select between Transmission and Reflection depending on your measurement probe head.
The sample gain determination can be set analogously to the Solids Transmittance measurement cell.
External reference gain determination. Manual, Optimized and Auto are available. Default settings are
Manual with a gain value of 1 for Transmission, and a gain value of 4 for Reflection.
Scan Quality Check
While measuring liquid samples in transmission, air bubbles may occur that change the effective
pathlength and therefore disturb the interferogram which is used to calculate the spectra. If this field is
checked an algorithm is applied that can detect disturbed interferograms via a comparison of the
amplitude signals. The amplitude of the distortion is compared to the interferogram peak size. If the
relative distortion is bigger than the maximum allowed error, the sca
n is rejected. The upper limit of “bad”
quality scans is set to 80% per default. This is the stop criterion after which a spectrum is rejected. The
number of “good” scans that needs to be integrated to give a spectrum is still set in the Number of Scans.
Liquids
Reference Cuvette Slot
The Liquids Measurement Cell offers the possibility to choose one of the six cuvette slots as a reference
channel, if a liquid is supposed to be measured for that purpose.
6.2.11. Report parameters
To get access to the report parameter list, click on the entry "Report" in the file tree list on the left.