Agilent 1200 Series Autosampler Reference Manual 237
Theory of Operation 8
Fan Drive The fan speed (two speeds are possible) is controlled by the main processor
according to the internal heat distribution inside the module. The fan provides
a PWM signal which is proportional to the revolution. This fan status signal is
used for diagnostics.
Electronic Fuses The circuits that are connected to + 36 V are fused on the board electronically.
Onboard Battery An onboard lithium battery buffers the electronic memories when the module
is turned off. For safety information on lithium batteries see “Lithium
Batteries Information” on page 267.
Autosampler-Specific Electronics
The autosampler specific functions provided by the electronics are:
• closed loop control of four axis vial handling servos
• electric valve control
• Needle unit control
• metering device control
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