Agilent Technologies 8453 Operator's Manual page 198

Table 48
Diagnostics and Troubleshooting
General Troubleshooting Hints
Measured Values are Different to those of Another Instrument
Causes and solutions for measured values being different to those of another
instrument are shown in Table 48.
Measured Values are Different to those of Another Instrument
Possible Causes
Very low sample concentration
Variations in the sample
One lamp switched off
Weak lamp
92
Action
Increase integration time to improve
signal-to-noise ratio.
Check that the sample does not:
• contain particulates that float in and out
of the light beam (filter if necessary)
• shows signs of bubble formation though
chemical reaction or degassing
• show signs of thermal or photochemical
degradation.
Check that both lamps are switched on if
measurement over whole spectral range is
required. If spectra in the UV range only are
being measured then deuterium lamp must
be on. If spectra in the Visible range only are
being measured then tungsten lamp must be
on.
Use diagnostics intensity test to check if lamp
intensity is too low and change lamp if
necessary.