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Theory of Operation
Spectrophotometer Lamp Supply (SLS) Board
Safety Light Switches
When the sheet metal lamp door is removed and the instrument is still on, the
safety light switches are activated and result in turn off of the deuterium and
tungsten lamps.
The safety light switches provide shutdown in two different ways. One is a
direct line to the deuterium lamp filament and current control circuits as well
as the tungsten lamp voltage control circuit. The second is through the
processor on the SPM board. The different ways are used to provide
maximum reliability and safety.
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