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Diagnostics and Troubleshooting
General Troubleshooting Hints
Measurement Results Indicate Excessive Drift
The selftest (only Agilent ChemStation software), lamp intensity, and
stability diagnostics within the software can aid in diagnosing problems
within the optical system which contribute to excessive drift. Causes and
solutions for excessive drift are shown in Table 44.
Table 44 Excessive Drift
Possible Causes Action
Variations in temperature. Ensure that the environment in which the
spectrophotometer is being used is stable.
The photodiode array temperature may be
monitored from within the software to verify
PDA temperature stability.
Sample degrades with time and/or exposure
to light.
Use the spectrophotometer without sample.
If the problem is found to be sample related,
i.e. sample exposure to light, limit the
amount of light by the environment and/or
shorten the integration time to limit the
amount of light during the measurement or
use filter wheel to cut out the energetic low
UV range.
Floating particles in the cell. Filter sample before measurement.
Deuterium lamp may burn unstable. Exchange lamp.
Tungsten lamp may burn unstable Exchange lamp.
Spectrophotometer lamp supply (SLS) board
may supply unstable power.
Exchange SLS board.
Spectrophotometer data acqusition (SDA)
board may be defective.
Exchange SDA board.
Main power supply (MPS) may supply
unstable power.
Exchange MPS.
Spectrograph electronics may be defective. Exchange optical unit.
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