Intensity Test - Agilent Technologies G1314B VWD User Manual

Intensity Test

The intensity test measures the intensity of the deuterium lamp over the full
VWD wavelength range (190 – 600 nm). The test can be used to determine the
performance of the lamp, and to check for dirty or contaminated flow cell
windows. When the test is started, 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 characteristics. Therefore, intensity spectra will differ
slightly between instruments.
spectrum.
Intensity Test Evaluation (Agilent ChemStation only)
The Agilent ChemStation evaluates three values automatically and displays
the limits for each value, the average, the minimum and the maximum of all
data points and passed or failed for each value.
Test Failed
Probable Causes
• Absorbing solvent in flow cell.
• Dirty or contaminated flow cell.
• Dirty or contaminated optical components (source lens, mirrors, grating).
• Old or non-Agilent lamp.
Suggested Actions
1200 Series Variable Wavelength Detector User Manual
Ensure the flow cell is filled with water.
Repeat the test with the flow cell removed. If the test passes, exchange the
flow cell windows.
Clean/replace optical components.
Exchange the lamp.
Figure 34 shows a typical intensity test
Maintenance 8
101