BUCHI NIRWare - Manual (Page 321)

NIRWare 1.5 Software Manual NIRWare Operator
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315
NOTE:
By default, only administrators are allowed to give the signature for acceptance. Everyone else will get an
error message. -This security setting can be configured within the Mangagement Console under
Security Designer
– Security Policies: Acceptance of External References.
7.5.3. Tips and Tricks
Frequent causes for deviations
Temperature drift
The performance of lamp, detector and electronics is influenced by the temperature. Despite many
ingenious compensation techniques (like using a thermostated detector), a slight temperature
dependence is inevitable. Therefore, you should operate the instrument in a thermostable environment
(
avoid direct sunlight or strong illuminating spots, cold winds from open windows or air condition,…) and
let the instrument warm up to operating temperature several minutes after start up, before using it.
Temperature effects mainly cause intensity differences, while the spectrum curve shape basically remains
the same.
Dirty reference or optics
Any extra material in the optical pathway can alter the spectrum. Therefore, keep your reference and
optics clean. Extra bands suddenly showing up in the spectrum indicate extra substance in the optical
pathway.
Error in hardware setup
If the external reference has simply been forgotten, or was mounted incorrectly, this will obviously result in
faulty spectra. Therefore, always check your hardware if you encounter a deviation warning.