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Performance validation
The MicroLab PC software has three tests appropriate for
performance validation of the instrument. All of these tests can be
accessed from the Advanced Features, System Check page of the
MicroLab PC software. The 4500 Series FTIR system should be
warmed up for at least 30 minutes before conducting any of these
tests. These tests can be run on a quarterly, bi-annual or annual basis
to determine that the instrument is performing within its
specification.
Performance (signal-to-noise) test
This test measures the signal-to-noise level at two regions of the IR
spectrum: 2500 cm
the reciprocal of the root mean squared (RMS) noise in the defined
region for a blank sample measured with a blank background. Both
the background and sample are measured at 4 cm
one minute collection time. This test takes 2 minutes per test. The
user can specify a number of tests to be conducted. At least 10 tests
should be collected in order to obtain an accurate picture of the
performance.
Stability test
This test measures the short-term stability at two regions of the
spectrum: 3000 cm
baseline differences observed over the selected time period. The test
measures a background at the beginning, then one sample every
minute for the duration of the test as specified in the 'Number of
minutes' field in the software. The test results are expressed as
%Transmittance (difference versus 100%) of maximum deviation
during the stability test.
Agilent 4500 Series FTIR Operation Manual
-1
-1
and 1000 cm
. The signal-to-noise is defined as
-1
-1
and 1000 cm
. Stability is a measurement of the
Getting Started
-1
resolution with a
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