Veris Technologies VIS_NIR Spectrophotometer - Operating Instructions - Manual (Page 19)

Pub# OM17-NIR Shank
2-16
Setting Integration Time:
The integration time is the amount of time the spectrometers collect the spectral data for
averaging. It is important to have this set correctly because too much light will saturate
the spectrometer, while too little light won’t allow the full range of the detector to be
used. The integration time needs to be set before acquiring spectral data. This is
especially important for users switching between probe and shank modules as
the optics are different and the amount of light seen by each device varies.
Step 1: Open the Veris Spectrophotometer Software and start the system check. After
the first Dark and Reference measurements are stored check the ref spectra display
(example shown below). The two peaks shown should be around 40000.00 counts.
The first peak is controlled by the Ocean Optics (oo) int time, while the second peak is
controlled by the Hamamatsu (ham) int time. If peaks are too high, then lower the
integration time. If peaks are too low then raise the integration time.
Step 2: Once it has been determined which way to move the integration time, exit the
software and open the acq_settings.txt file located in the C:\Veris directory.
0.010 12.000
5.000 8.000 0.150 0.150 0.300 0.150 2.000
Example of data stored in acq_settings.txt
The second value represents the ham integration time, while the third value represents
the oo integration time. Raise or lower these values then save the file, open the Veris
Spectrophotometer Software, run a dark and reference measurement, and then check
these values again to see how the peaks changed.
Example of ref spectra shown
in system check and acquisition
with correct integration time set.
Ocean Optics Integration time
Hamamatsu Integration time