Agilent Technologies 1100 Series Reference Manual page 188

6
Introduction to the Variable Wavelength Dector
would produce a leak signal. The signals are converted by the diagnostic A/D
converter.
Fan Drive
The operation of the fan is controlled by the main processor and runs with constant
revolution. The fan produces a sense signal which is derived from the revolution. This
sense signal is used for diagnostics. If the fan does not turn, the deuterium lamp and the
grating drive are switched off.
Filter Motor Driver
The filter motor driver, controlled by the main processor, drives the filter motor with
constant voltage, 2-phase full stepping.
Grating Motor Driver
The grating motor driver, controlled by the main processor, drives the grating motor.
The motor driver controls and balances each coil current of the 2-phase stepper motor
(corrected micro-step stepper motor driver circuit).
The step angle of the stepper motor rotation is reduced electronically into 0.01
step. The data of current control for detent torque correction is programmed on ROM
(Read Only Memory).
On-board Battery
An on-board lithium battery buffers the electronic memories when the module is turned
off.
For safety information on lithium batteries
249.
Interfaces
For detailed information on interfaces, see
203.
186 1100 Series Variable Wavelength Detector Reference Manual
"Lithium Batteries Information"
"Agilent 1100 Series Interfaces"
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