Agilent Technologies 1220 Infinity II LC - Spectral Flatness Test

1220 Infinity II LC System User Manual 181
Test Functions and Calibration
9
Diode Array Detector (DAD)
Spectral flatness test
The spectral flatness test determines the maximum noise (in mAU) on the
spectrum. The test is run with the flowcell removed to eliminate effects due to
absorbing solvent or a dirty flowcell. First, a detector balance is done. Next, a
spectrum (no flowcell) is taken.
Theoretically, the spectrum should be flat, however, in practice, noise is
superimposed on the spectrum. The amplitude of the noise is a measure of the
optical and electronic performance.
Figure 56 Spectral Flatness Test (Signals)
Spectral Flatness Evaluation
Test Evaluation
Limit is < 0.002 AU
NOTE
This test is part of the detector self test only, see “Self-test” on page 171.