Controlling The Lamps With Chromquest - Thermo Scientific Surveyor PDA Plus Hardware Manual

5
ChromQuest Diagnostics for the PDA Detector

Controlling the Lamps with ChromQuest

Controlling the Lamps with ChromQuest
78 Surveyor PDA Plus Detector Hardware Manual
As lamps age, they emit less light, which results in increased baseline noise. If the noise level of
your detector signal is unacceptable, and cleaning the flow cell does not help, use the
diagnostic features of the software to determine the cause of the problem. If light output
becomes too low and adjusting the attenuators as described in
from the Lamps" on page 79
Maintenance."
The detector keeps track of the number of hours each lamp has been operating. The
deuterium lamp has a lifetime of approximately 1000 hours and the tungsten lamp has a
lifetime of approximately 2500 hours. Lamp lifetime varies depending upon the application.
In the ChromQuest data system, the lamp controls are on the Lamps page of the PDA
Diagnostics.
 To open the Lamps page in ChromQuest
1. Open the online Instrument window in ChromQuest.
2. In the menu bar of the Instrument window, choose Control > Instrument Status to open
the Instrument status window.
3. In the Instrument Status window, click the Surveyor PDA Plus tab to open the Surveyor
PDA Plus Instrument Status page.
4. Click Diagnostics to open the PDA Plus Diagnostics dialog box.
5. Click the Lamps tab to open the Lamps page, and then note the status and usage of each
lamp (see Figure 71).
Note Avoid indiscriminately pressing either Reset button. They should be pressed
only after their associated lamp has been replaced with a new one.
Note The intensity of the deuterium lamp falls off very slightly over a period of time
after it is turned on. You should wait at least 1 h for the lamp to stabilize after a cold
start before collecting data in the spectral range of the deuterium lamp.
does not help, replace the lamps. See
"Adjusting the Light Output
Chapter 6, "Routine
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