Agilent Technologies 1100 Series Reference Manual page 243

Introduction to the Detector 6
Deuterium Lamp Filament Control
Before ignition, the deuterium lamp filament control circuit provides a
constant voltage of 2.5 VDC at approximately 6 A to the filament of the
deuterium lamp. The deuterium lamp filament control circuit is enabled by the
processor on the DAM board.
Deuterium Lamp Current Control
The deuterium lamp current control circuit comprises two parts. One part
generates an ignition pulse of 600 VDC for the lamp, resulting in lamp ignition.
After ignition this voltage is disabled. The other part is a constant current
source of 320 mA at an operating voltage of about 85 VDC for stable operating
conditions and light emission of the deuterium lamp. The deuterium lamp
current control circuit is supervised by the processor on the DAM board.
Igniting the Deuterium Lamp
The deuterium lamp is heated for several seconds prior to ignition. The
deuterium lamp current control circuit gives an ignition pulse to the lamp,
resulting in lamp ignition. The filament control circuit disables the filament
voltage if the lamp was ignited successfully.
If the deuterium lamp failed to ignite, the whole sequence is repeated after a
wait sequence for cooling down. If the deuterium lamp still does not ignite, an
error message occurs.
Tungsten Lamp Voltage Control
The tungsten lamp voltage is generated by the tungsten lamp voltage control
circuit which is enabled by the processor. This circuit provides a constant
voltage of 6 VDC to operate the tungsten lamp.
1100 Series DAD and MWD Reference Manual 243