General Operating Information
2
Keysight U2040 X-Series User’s Guide
67
U2040 X-Series Features
Broadband coverage for any modulated signal formats
The U2040 X-Series measures accurate average or time-gated average power for any
modulated signal including all common wireless signals such as LTE, LTE-Advanced with
100 MHz bandwidth, and WLAN 802.11ac with 80/160 MHz bandwidth.
List mode/test sequencing
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 mode and at normal/double/fast 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 20
μ
s
[1]
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.
NOTE
Refer to the
U2040 X-Series Programming Guide
for more information.
[1] Only applicable for
≥
300 MHz. For <300 MHz, the minimum aperture size is 50
μ
s. If the existing aperture
size is set to <50
μ
s and the frequency is changed from
≥
300 MHz to <300 MHz, the aperture size will
automatically be changed to 50
μ
s.