Keysight N9923A, User Manual, Page: 25 / 276

Keysight N9923-90001 User’s Guide 25
Preparing for Initial Use of Your New FieldFox
Avoid Overpowering the FieldFox
— The temperature at which the following events occur is the average of the
RF1, RF2, SB1, SB2 temperatures. These temperatures come from internal
sensors embedded within FieldFox.
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.
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.
Avoid Overpowering the FieldFox
The FieldFox can be damaged with too much power or voltage applied.
Exceeding the maximum RF power levels shown below will cause an
ADC Over
Range
message to appear on the screen.
Measurement speed specifications do NOT apply in Temperature Control
Mode.
Maximum Input Voltages and Power:
—
RF IN/OUT Connectors: ±50 VDC, +23 dBm RF
—
DC Input: -19 to 19 VDC, 40 Watts maximum when charging battery
Learn more about Maximum power and voltages in the FieldFox Data
Sheet.