Fieldfox High-Temperature Protection; How To Monitor The Internal Fieldfox Temperature; Temperature Control Mode; High-Temp Shut Down - Keysight Technologies FieldFox N9913A Service Manual

Troubleshooting

FieldFox High-Temperature Protection

FieldFox High-Temperature Protection
The following features prevent degradation or damage in the event of high
internal temperatures in the FieldFox.
Do NOT store the FieldFox in the softcase while powered ON or in Standby mode.

How to monitor the internal FieldFox temperature:

— Press System, then Service Diagnostics.
— Press Internal Temperatures.
— The temperature at which the following events occur is the average of the

Temperature Control Mode

At approximately 75°C, the FieldFox enters Temperature Control mode by
reducing display intensity, switching to Outdoor Sun display colors, and
reducing measurement speed. This should decrease the internal temperature
which preserves measurement accuracy and maintains the long-term reliability
of the FieldFox. When this occurs, the following message is displayed on the
FieldFox screen:
The system is entering Temperature Control Mode due to high
internal temperature.
When entering Temperature Control mode, save your instrument state and
data that you want to keep.
When the temperature drops to approximately 73°C, a message is displayed
indicating that the FieldFox is leaving Temperature Control Mode and normal
operating settings are restored.
Measurement speed specifications do NOT apply in Temperature Control Mode.

High-Temp Shut down

In extreme situations, Temperature Control mode may not stop an increase in
the FieldFox internal temperature. At approximately 78°C, High-Temperature
Shut down will engage and turn OFF the FieldFox.
Just prior to shut down, the FieldFox will display a warning of imminent shut
down.
Keysight FieldFox Handheld Analyzers Service Guide
RF1, RF2, SB1, SB2 temperatures. These temperatures come from internal
sensors embedded within FieldFox.
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