Ventilation Requirements; Thermal Protection - HP 81101A Quick Start Manual

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Ventilation Requirements

The instrument is fitted with three cooling fans. Make sure that there is

adequate clearance of 80 mm at the rear and 25 mm at the top and

bottom to ensure adequate air flow. If the air flow is restricted, the

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.

NOTE

Do not cover the ventilation holes.

Overheating Detection

The instrument monitors its internal temperature. If the temperature

exceeds approximately 80°C, the power supply is switched off. The

instrument will switch on again if the temperature falls below

approximately 77°C.

Fan Failure

If a fan is broken or prevented from operating by a blockage, the

temperature will increase. When the temperature exceeds approximately

80°C the overheating detection switches off the instrument for safety

reasons. For reliability it is recommended to send instruments with

broken or defective fans immediately to HP Service for repair.

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