Metrohm NIRS XDS MultiVial Analyzer - Manual (Page 83)

▪▪▪▪▪▪▪ 81
In some cases the user may see the message shown. This
indicates that the instrument has passed Wavelength
Certification on the NIST-defined peaks, but has not
passed on the tighter, FOSS-defined wavelength
positions.
This is not considered a failure, as the instrument still
passes Wavelength Certification on NIST-defined peaks.
Verify that the instrument is fully warmed-up. If so, and
this test still fails, re-run Instrument Calibration to set the
peaks to proper positions. If required, run Wavelength
Certification to verify that all peaks pass.
7.2.3 Photometric Test
Photometric Test provides a method to verify ongoing photometric performance of the instrument.
This is a requirement for pharmaceutical users. Test results are stored in the Diagnostic Database, and
may be accessed at any time. Control charts are plotted (after several tests have been stored) to
provide an ongoing record of performance.
The test uses the same standards used in IPV Setup. Photometric Test compares current spectra of
each standard to those stored during IPV setup. If any differences exceed normal tolerance values,
the instrument can be assumed to have changed in some manner, and may need service.
Because the calibrated photometric standards are the link to previous photometric performance, the
standards should always be stored in their wooden box, and protected from fingerprints, dropping,
or other damage. If any cup is opened, dropped, or otherwise altered, Photometric Test results may
fail.
To run Photometric Test, select it from the
Diagnostics menu.