Keysight N9912A User Manual page 100

 Press Meas Setup 4.
 Then
 Then
 Then choose from the following:
For both Meas Types, choose the reference for the offset data.


Other ACPR Settings
All relevant FieldFox settings are made automatically to ensure the highest accuracy,
such as ResBW, VideoBW, and sweep (SwpAcquisition) speed. These, and all other
SA Mode settings, can be changed manually in a ACPR measurement.
 Learn about Measurement Preset on page 94.
 Learn about Averaging on page 94.
RRC Weighting
RRC, or Root-Raised-Cosign weighting, is offered with Channel Power and ACPR
measurements.
When RRC Weighting is applied to transmitted and received power, the edges of the
channel are 'smoothed' to help prevent interference. To accurately measure a
channel that has RRC weighting, set the same value of RRC weighting as that used
in the transmitter and receiver.
Channel power measurement with .22 RRC applied
RRC Weighting is set and enabled automatically when included in a selected radio
standard.
To set and enable RRC Weighting:
100
More
Meas Type
– Integrated carrier power is represented in dBm, and relative
Total Pwr Ref
o
powers between offsets and carrier are represented as dBc (dB below the
carrier).
(Power Spectral Density) – Integrated carrier power is normalized to a
PSD Ref
o
1 Hz density as dBm/Hz using a similar algorithm as Noise Marker. Learn more
about the Noise Marker on page 90.
– dB or dBc value is computed by subtracting the measured carrier power
Auto
from the measured offset power.
– dB or dBc value is computed by subtracting the entered RefValue from the
Man
measured offset power.
Press
Ref Value
o
Then enter a value to be used to reference the data using the numeric keypad,
o
▲|▼ arrows, or the rotary knob.
FieldFox User's Guide