LI-COR LI-7500, Instruction Manual

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Section 3
Setup and Operation 3-53
Dust and Pollen
The LI-7500 is quite tolerant of small particulates on the windows, as long as they are small,
and spectrally neutral. Pollen is a problem because it is sticky and can accumulate, so monitor
the AGC values and clean the windows as needed.
Vibrations
The LI-7500 is vibration sensitive to frequencies of 152 Hz ± the bandwidth. Thus, if the
bandwidth is 10Hz, the frequency problem range is 142 to 162 Hz (and upper harmonics).
The instrument is completely insensitive to vibrations slower than this, and very slightly
sensitive at frequencies higher than this.
For land-based installations, probably the most likely source of vibrational problems would be
on a tower with tight guy wires. For other settings (aircraft, ships, etc.) where there may be
vibrations in the problem range, you should try to minimize the problem through alternative
mounting attachments.