Installation and Maintenance
81150A and 81160A Getting Started Guide 97
4.3 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 on both sides 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.
4.3.1 Thermal Protection
The instrument monitors its internal temperature. If the temperature
exceeds approximately 80°C the power supply is switched off. The
instrument will not turn on automatically if the temperature is decreasing
again.
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 Agilent Service for repair.
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