Keysight Technologies C Series User Manual page 33

Fieldfox analyzers

Preparing for Initial Use of Your New FieldFox

FieldFox High Temperature Protection

— The average temperature that is displayed for the Internal Temperature is

Temperature Control Mode

The FieldFox's internal temperature control preserves measurement accuracy

and maintains the long-term reliability of the FieldFox. See also,

Shutdown Warning (RTSA Mode Only)" on page

Measurement speed specifications do NOT apply in Temperature Control

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

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

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"

Keysight N9915-90020 User's Guide

the average of the RF1, RF2, SB1, SB2 temperatures. These temperatures

come from internal sensors embedded within the FieldFox.

The average temperature does not include the CPU or the battery

temperatures. The FieldFox does not measure the CPU and battery

temperatures.

Chapters