Keysight X Series Measurement Manual page 34

Making MSR Measurements
MSR Downlink Signal Measurement
Step
7. (Optional) Change
measurement
parameters from their
default condition.
If you have a problem, and get an error message, see the guide "Instrument
Messages", which is provided on the Documentation CD ROM, and in the
instrument here:
C:\Program Files\Keysight\SignalAnalysis\Infrastructure\Help\bookfiles.
Troubleshooting Hints
This Spectrum Emission Mask measurement can reveal degraded or defective
parts in the transmitter section of the unit under test (UUT). The following are
examples of typical causes for poor performance.
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•
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Power amplifiers are one of the final stage elements of a base or mobile
transmitter and are a critical part of meeting the important power and spectral
efficiency specifications. Since spectrum emission mask measures the spectral
response of the amplifier to a complex wideband signal, it is a key
measurement linking amplifier linearity and other performance characteristics
to the stringent system specifications.
34
Action
Meas Setup
Press
that are available to change.
Faulty DC power supply control of the transmitter power amplifier.
RF power controller of the pre-power amplifier stage.
I/Q control of the baseband stage.
Degradation in the gain and output power level of the amplifier due to the
degraded gain control or increased distortion, or both.
Degradation of the amplifier linearity or other performance characteristics.
Notes
to see the keys For example, you can change the
Type
to
Meas Setup
Press
PSD Ref
view for the spectrum emission mask
measurement with a PSD reference. The PSD
reference is shown below the spectrum graph
in dBm/Hz.
Keysight N9083A & W9083A Measurement Guide
Meas
PSD Ref:
, Meas Type, and select
to display the Integrated Power