Metrohm Vision – Diagnostics - Manual (Page 59)

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16.2 USP Noise
The USP Noise measures RMS instrument noise over 100nm segments from 1200-2200nm based on
one spectrum of 32 scans. The screen that appears at the completion of the test is as follows:
When the test is completed, the pop-up window
to the right appears. If the user would like a
permanent printed record of the report, click
Print Report, and then Close Report.
16.3 Usp Low-Flux Noise Test
The USP Low-Flux Noise, like the Metrohm- Low Flux Test uses a nominal 10% reflectance standard
in the sample position. A noise test is run using this standard. Because the reflectivity is less than the
instrument standard, the test is considered a good method for testing instrument noise in the range
of reflectivity of many common sample absorptions. As with the USP noise test, one spectrum of 32
scans is used to measure the RMS noise over 100nm increments of the spectrum from 1200-2200nm.
A typical report is shown below.