The System Scans Normally But The Signal Intensity Is Very Low; The Baseline Is Not Stable - Thermo Scientific Nicolet iS10 Using Manual

If the temperature is not in the acceptable range, make sure the cooling vents on the back
of the instrument are not blocked and nothing is stacked on top of the instrument.
Maintain at least 30 cm (12 in) of clearance behind the instrument and 64 cm (25 in) of
clearance above the table. Make sure the ambient temperature is between 16 and 27 ºC
(60 and 80 ºF), and make sure that the power supply vents are not blocked.
8.—Contact us for assistance.

The system scans normally but the signal intensity is very low

1.—Align your instrument.
2.—Set Optical Velocity on the Bench tab of the Experiment Setup dialog box to a lower
velocity.
3.—If the Source status indicator is off, click the source indicator on the Diagnostic tab of the
Experiment Setup dialog box to check the source current and voltage. If the Source
indicator is on, check the interferogram on the Bench tab of the Experiment Setup dialog
box; if the interferogram is not present, check the beam path and detector.
4.—Check the Aperture parameter on the Bench tab of the Experiment Setup dialog box. For
an MCT-A detector, set Aperture to High Resolution. For a DTGS detector, set Aperture to
Medium Resolution.
5.—Make sure any accessories you are using are installed and aligned correctly. (For more
information, see the instructions that came with the accessory.)
6.—Contact us for assistance.

The baseline is not stable

1.—Lower the purge flow rate to minimize the acoustic noise inside the instrument until the
baseline is stable.
2.—Align your instrument.
3.—Use the Bench Diagnostics software to check the laser levels for proper balance. If the
levels are out of tolerance, contact us for assistance.
4.—Make sure the environmental conditions meet the requirements given in the site
preparation manual that came with your instrument.
5.—Check the humidity indicator and replace the desiccant and indicator if needed.
Notice: If you are using purge and the instrument cover was recently opened, allow the
instrument to purge for 3 to 5 minutes after the cover is closed.
6.—If the power to your instrument was recently turned on, allow 1 hour for the temperature
to stabilize.
7.—If the instrument has a cooled detector and the detector dewar was recently filled, allow
the detector to cool.
8.—Contact us for assistance.
Thermo Fisher Scientific Using Your Nicolet iS10 Spectrometer 35