Ventilation Requirements; Thermal Protection; Overheating Detection; Fan Failure - HP 8110A User Manual

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meet local safety requirements and include the following
features:
. Adequat,e load-carrying capacity
(see table
of
specifications).
n
Ground connection.
. Cable clamp.
Ventilation Requirements
The HP 8110A is fit,ted with two cooling fans. Make sure
that there is adequate clearance of 3 inches (75 mm) at
the rear and l/2 inch (12 mm) at. t,he top and bottom t,o
ensure adequate airflow. If the airflow is restricted t,he
internal operating temperature will be higher, reducing
the instrument's reliability or causing the instrument's
thermal-protection circuits to automatically switch off the
instrument.
Thermal Protection
Overheating Detection
The HP 8110A monitors its internal temperature in the
region of the power supply. If the temperature exceeds
approximately BOOC, the power supply is switched off.
The inswument will switch on again if the temperature
falls below approximately 77OC.
Fan Failure
If either of the fans is prevented from operating by a
blockage, or the power supply to the fans is interrupted,
the power supply is automatically switched off within 3
t,o 4 seconds. Note that after the fault condition has been
fixed, the instrument must remain switched off for at
least 2 minutes to allow the detection circuit to recover.
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lnstallingths HP 8110A