176 1220 Infinity II LC System User Manual
9
Test Functions and Calibration
Diode Array Detector (DAD)
Test Failed
Intensity Test
The intensity test measures the intensity of the deuterium and tungsten lamps
over the full wavelength range (190 – 950 nm). Four spectral ranges are used
to evaluate the intensity spectrum. The test is used to determine the
performance of the lamps and optics (see also “Cell Test” on page 184). When
the test is started, the 1-nm slit is moved into the light path automatically, and
the gain is set to zero. To eliminate effects due to absorbing solvents, the test
should be done with water in the flow cell. The shape of the intensity
spectrum is primarily dependent on the lamp, grating, and diode array
characteristics. Therefore, intensity spectra will differ slightly between
instruments. Figure 54 on page 178 shows a typical intensity test spectrum.
Intensity Test Evaluation
The Agilent LabAdvisor, ChemStation and Instant Pilot evaluate four spectral
ranges automatically, and display the limits for each range, the measured
intensity counts, and passed or failed for each spectral range (see Figure 54
on page 178).
Probable cause Suggested actions
1
Defective slit assembly (stray light).
Run the “Slit Test” on page 174 (part of the
“Self-test” on page 171).
2
Defective detector main board.
Please contact your Agilent service
representative.
3
Defective PDA/optical unit.
Please contact your Agilent service
representative.
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