4
Xcalibur Diagnostics for the PDA Detector
Controlling the Lamps with Xcalibur
54
Surveyor PDA Plus Detector Hardware Manual
Thermo Scientific
Controlling the Lamps with Xcalibur
As lamps age, they emit less light, which results in increased baseline noise. If the noise level
on 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
does not help, replace the lamps.
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.
Perform the following procedures in the Configuration page of the Direct Control dialog box
for the Surveyor PDA Plus Detector (
):
•
•
•
Setting the Startup Time for the Lamps
Turning On the Lamps
To turn on the lamps
Click
Turn On
for the associated lamp.
When you turn on the deuterium lamp, its Status readback reads
Starting
during the
10-second ignition period, and then it changes to
On
. If there is a problem with either
lamp, its Status readback reads
Failed
.
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 hour for the lamp to stabilize after a
cold start before collecting data in the spectral range of the deuterium lamp.
