General Operating Information 2
Keysight U2020 X-Series User’s Guide 61
U2020 X-Series Features
List mode
List mode is a mode of operation where a predefined sequence of measurement
steps can be programmed into the power sensor and repeatedly executed as
many times as required. This mode is suitable for power and frequency sweeps
which normally require changing the parameters via the appropriate SCPI
commands before performing a measurement. The hardware handshaking
communication between the power sensor and the signal source provides the
fastest possible execution time in performing the test sequences.
Trigger and gating parameters control which part of the waveform to be included
or excluded from the measurement. The list mode helps to analyze modulated
signals with regular and time-slotted or frame structure. For example, eight
time-slotted GSM bursts, LTE-FDD and LTE-TDD frames and sub-frames,
WCDMA frames and slots, and time-slotted measurements are supported in this
mode. The desired number of slots and their duration and exclusion intervals can
be easily programmed.
Variable aperture size
In average only mode and at normal measurement speed, the time interval length
used to measure the average power of the signal can be adjusted by setting the
aperture size to between 125 μs and 200 ms. This is useful for CW signals and
noise-like modulated signals such as FDD-LTE and WCDMA by performing
measurements over the full frames or sub-frames.
Decreasing the aperture size will improve the measurement throughput but
reduce the signal-to-noise ratio of the measured signal. However, increasing the
aperture size will improve the signal-to-noise ratio of the measured signal but
reduce the measurement throughput.
Refer to the U2020 X-Series Programming Guide for more information.
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