Agilent 1200 Infinity Series DAD User Manual 107
Optimizing the Detector
5
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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