Agilent InfinityLab LC Series VWD User Manual 75
5 Optimizing the Detector
Warm up of the Detector
Warm up of the Detector
Give the optical unit enough time to warm-up and stabilize (> 60 minutes). The
detector is temperature controlled. After turn-on of the detector, it goes through a
cycle of different states:
• 0 to 0.5 minutes the heater control is OFF and the heater element runs at 0 %
duty cycle.
• 0.5 to 1 minutes the heater control is OFF and the heater element runs at 66%
duty cycle. This first minute is used as self-test of the heater functionality.
• 1 to 30 minutes the heater control is OFF and the heater element runs at 40%
duty cycle.
• After 30 minutes the heater control is ON and is working with optimized
parameters to get the optical unit into the optimal temperature window
stabilized.
This cycle starts
• when the detector is turned off/on
• when the lamp is turned off/on
to ensure that the temperature control operates in a defined control range.
The figures below show the first two hours of a detector warm-up phase. The
lamp was turned on immediately after turn on of the detector.
The times to stabilize the baseline may vary from instrument to instrument and
depends on the environment. The example below was done under stable
environmental conditions.
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