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Performance validation
The MicroLab PC and MicroLab Mobile software have three tests
appropriate for performance validation of the 4200 FlexScan FTIR.
All of these tests can be accessed from the Advanced Features,
System Check page of the MicroLab PC and MicroLab Mobile
software. The 4200 FlexScan 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. For 45 degree
external reflectance and grazing angle reflectance measurements, the
appropriate reflective reference cap should be in place for the entire
test. No reference cap is needed when using the ATR sample
interface. At least 10 tests should be collected in order to obtain an
accurate picture of the performance. The table below gives the
minimum performance for each sample interface.
Table 3. Minimum performance for the Signal-to-Noise test
Sample interface
ATR
External reflectance
Grazing angle
Agilent 4200 FlexScan FTIR Operation Manual
-1
-1
and 1000 cm
. The signal-to-noise is defined as
Specification @ 2500 cm
2500
1500
1500
Getting Started
-1
resolution with a
Specification @ 1000 cm
-1
6000
2800
2800
-1
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