Agilent Technologies 1100 Series Reference Manual page 266

8
Theory of Operation
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.
On-board Battery
An on-board lithium battery buffers the electronic memory when the module
is turned off.
For safety information on lithium batteries see
Information"
Analog Outputs
There are two independent analog outputs (0...1 V full scale). Digital data from
the ASIC is converted into a pulse-width modulated signal (PWM). The PWM
signal is then fed to an amplitude modulator, which precisely turns the
reference signal on and off. This signal then passes to a low-pass filter section.
Interfaces
For detailed information on interfaces, see
268
on page 335.
"Lithium Batteries
"Interfaces" on page 285.
1100 Series FD Reference Manual