Fieldfox High-Temperature Protection; Avoid Overpowering The Fieldfox - Keysight N9923A FieldFox User Manual

FieldFox High-Temperature Protection

The following features prevent degradation or damage in the event of high internal
temperatures in the FieldFox.
NOTE Do NOT store the FieldFox in the softcase while powered ON or in Stand By mode.
How to monitor the internal FieldFox temperature:
 Press System, then
 Then
 The temperature at which the following events occur is the average of the RF1,
SB1, SB2 temperatures. These temperatures come from internal sensors embedded
within FieldFox.
Temperature Control Mode
At approximately 73 °C, the FieldFox enters Temperature Control mode by reducing
display intensity and measurement speed. This should decrease the internal
temperature which preserves measurement accuracy and maintains the long-term
reliability of the FieldFox.
When entering Temperature Control mode, save your instrument state and data that
you want to keep.
When the temperature drops to approximately 71°C, normal operating settings are
restored.
NOTE Measurement speed specifications do NOT apply in Temperature Control Mode.
High-Temp Shutdown
In extreme situations, Temperature Control mode may not stop an increase in the
FieldFox internal temperature. At approximately 75°C, High-Temperature Shutdown
will engage and turn OFF the FieldFox.
Just prior to shutdown, 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.
WARNING
NOTE Very often, coaxial cables and antennas build up a static charge, which, if allowed to
discharge by connecting to the FieldFox, may damage the instrument input circuitry.
To avoid such damage, it is recommended to dissipate any static charges by
temporarily attaching a short to the cable or antenna prior to attaching to the
FieldFox.
14
Service
Internal Temperatures.
Maximum Input Voltages and Power:
 Port 1 and Port 2 Connector: ±50 VDC,
 External Trig/Ref Connector: 5.5 VDC

DC Input: 19 VDC,
Diagnostics.
+23 dBm RF
FieldFox User's Guide