Spurious Emissions Measurement - Keysight X Series Measurement Manual

Making MSR Measurements
MSR Downlink Signal Measurement

Spurious Emissions Measurement

This section explains how to make the Spurious Emission measurement on a
LTE TDD downlink signal. The measurement procedure for uplink signal is
similar. This measurement identifies and determines the power level of
spurious emissions in certain frequency bands. For more information on this
measurement, see
For signal setting, see
Measurement Procedure
Step
1. Perform the common
configuration.
2. Initiate the Spurious
Emission
measurement.
3. Toggle the RF
Coupling to DC.
4. Recall the masks.
Keysight N9083A & W9083A Measurement Guide
"Spurious Emissions Measurement Concepts" on page
"Setting the Downlink Signal" on page
Action
"Common Measurement
See
Procedure (Downlink)" on
page 16
.
Meas Spurious Emission
Press ,
Input/Output RF Input
Press ,
RF Coupling DC
, .
Recall, Data, Mask then
Press
Open...
,a file open dialog appears.
Select the appropriate file under
masks\SPUR_BS\examples and click
open. This will apply the Limit settings
quickly. The other parameters will not
be changed. At the bottom of the
screen, there is a message to indicate
which mask file is recalled. In this
example,
SPUR_BS_MSR_Band2_wGSM_CatB.m
ask is used.
Notes
It is not necessary if you already did it in other
measurements.
Depending on the current settings, the
.
instrument will begin making the selected
measurements. The resulting data is shown
on the display.
In AC coupling mode, you can view signals
,
less than 10 MHz but the amplitude accuracy
is not specified. To accurately see a signal of
less than 10 MHz, you must switch to DC
coupling.
When operating in DC coupled mode, ensure
protection of the External Mixer by limiting the
DC part of the input level to within 200 mV of
0 Vdc.
The Spurious Emissions measurement results
Figure 2-17
should look like
window and the text window show the spurs
that are within the current value of the Marker
Peak Excursion setting of the absolute limit.
Any spur that has failed the absolute limit will
have an 'F' beside it.
The measurement result shows the largest
spur which is yellow. You can select the other
spur by pressing Meas Setup, Spur and enter
the number of the spur.
If you set the Meas Type to Examine, the trace
is continuously updating to show the latest
spectrum range which has the worst spurious.
However, the table always shows the last
reported trace information. Press Restart to
update the table to show the latest result.
59.
14.
. The spectrum
35