41 | Keysight | FieldFox Handheld Analyzers 4/6.5/9/14/18/26.5/32/44/50 GHz - Data Sheet
External USB Power Sensor Support
The external USB power sensor option supports various Keysight USB power sensors. For an up-to-date listing of the supported power
sensors, visit http://www.keysight.com/find/fieldfoxsupport.
Description
Setup parameters
Functions
Frequency
Relative/absolute measurements, offsets, units of dBm or watts, or dB or %, minimum and maximum limits.
Internal source
FieldFox’s internal source can be turned on in the USB power sensor mode. CW frequency and nominal power
level control are available.
Pulse Measurements
FieldFox’s pulse measurement option can be used to characterize RF pulses such as those used in radar and electronic warfare
systems. Measurements are made using FieldFox and Keysight’s USB peak power sensors.
Performance specifications such as frequency, dynamic range and minimum pulse width depend on the peak power sensor. Supported
peak power sensors: http://www.keysight.com/find/fieldfoxsupport
Description
Setup parameters
Functions
Frequency, time (center), time/division, gating, triggering, video bandwidth, averaging
Average power, peak power, and peak to average ratio
Analog gauge display and digital display, dBm and watts
Relative/absolute measurements, offset, dB or %, minimum and maximum limits
Trace graph for pulse profiling with gating
Rise time, fall time, pulse width, pulse period, pulse repetition frequency
USB Power Sensor Measurements versus Frequency
This feature allows FieldFox’s source frequency to be set independently from the power sensor (receiver) frequency. With frequen-
cy-offset using power sensor (FOPS), the frequency of both the source and receiver are swept, and the two track each other. The offset
frequency can be negative, zero, or positive.
FOPS can be used to characterize the scalar transmission response of devices such as mixers and converters. This frequency-offset
capability is necessary for conversion loss/gain measurements on frequency-translating devices, since by definition, the input and
output frequencies of the DUT are different. The FieldFox source stimulates the DUT and the power sensor is used as the measurement
receiver.
Since power sensors are inherently broadband devices (not frequency-selective), the user should ensure that only the signal of interest
is present at the power sensor input and that all others signals are filtered appropriately.
Setup parameters
Source frequency
Receiver frequency
Frequency offset
Frequency step size
Number of points
Center/span or start/stop
Range determined by power sensor range
Positive offset or negative offset
30 kHz minimum
2 to 1601
Combination of number of points and frequency step size limited by span.
Dwell time/point 0 to 1.0 sec
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