Avoid Overpowering The Fieldfox - Keysight Technologies FieldFox A Series User Manual

Preparing for Initial Use of Your New FieldFox

Avoid Overpowering the FieldFox

Summary of FieldFox Average Internal Temperature Protection
Behavior
Table 2-1 Summary of FieldFox Temperature Protection
Threshold
Duty cycling
Maximum Protect (Initial)
1 degree below shutdown
(RTSA Mode Only)
Shutdown
Exit Duty Cycle
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.
Maximum Input Voltages and Power:
—
—
Learn more about Maximum power and voltages in the FieldFox Data
Sheet.
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.
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Average Internal Description of Behavior
Temperature
~64°C Duty cycling is enabled when the internal average temperature of the
FieldFox reaches the duty cycling threshold of ~64°C. Power is turned
off between sweeps and delaying occurs for the next sweep.
In RTSA mode power is only turned off in Single Sweep or Hold. This
enables you to control your instrument's temperature when you don't
need to make a measurement by using the "Run/Hold" hardkey to
pause the sweep.
All applications (including RTSA): Display dims to 40% at ~64°C.
~75°C When temperature reaches the maximum protection threshold
(~75°C) some applications take additional measures.
~77°C RTSA Shutdown Warning (~77°C) — (Top "WARNING..." message
displays for 9 sec). Red text at bottom of display remains on until
internal temperature returns to ~75.5°C. Refer to
page
~78°C Instrument shuts down.
~62.5°C The temperature required to come out of the duty cycle threshold.
RF IN/OUT Connectors: ±50 VDC, +27 dBm RF
DC Input: -19 to 19 VDC, 60 Watts maximum when charging battery
33.
Keysight N9927-90001 User's Guide
Figure 2-3 on