Keysight N9927-90001 User’s Guide 31
Preparing for Initial Use of Your New FieldFox
FieldFox High Temperature Protection
— 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
The FieldFox’s internal temperature control preserves measurement accuracy
and maintains the long-term reliability of the FieldFox. See also, “High-Temp
Shutdown Warning (RTSA Mode Only)” on page 33.
Entering Temperature Control Mode
At an average internal temperature of above approximately 64°C, the FieldFox
enters Temperature Control mode by reducing display intensity. This should
decrease the internal temperature which preserves measurement accuracy and
maintains the long-term reliability of the FieldFox. Refer to Figure 2-1.
In addition, duty cycling is enabled when the internal average temperature of
the FieldFox reaches the duty cycling threshold of above ~64°C. All
applications (except RTSA): Power for internal circuitry is turned off between
sweeps and delaying occurs for the next sweep. In RTSA mode, power is only
turned off, if the FieldFox is in Single Sweep or Hold.
All applications (including RTSA): Display dims to 40% at ~64°C.
For all modes, except RTSA mode, you will see the following messages
displayed for ~3 seconds:
"Automatic Meas Duty Cycling activated for thermal
management"
Later if the temperatures are reduced:
"Temperatures reduced, ending Automatic Meas Duty Cycling"
For RTSA mode (where duty cycling is not possible), you will see the following
messages displayed for ~3 seconds:
"Entering Auto Protect mode for thermal management"
Later if the temperatures are reduced:
"Temperatures reduced, exiting Automatic Protect Mode"
Entering Auto Protect (Maximum) Threshold Temperature Mode
At above approximately 75°C, the FieldFox enters (Maximum) Auto Protect
temperature control mode by displaying the "Entering Auto Protect mode...".
See also Table 2-1 on page 34.
When you enter the Auto Protect (Maximum) Threshold, the following message
is displayed:
Measurement speed specifications do NOT apply in Temperature Control
Mode.
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