Agilent Technologies FieldFox N9912A User Manual page 92

Measurement Type
This setting determines how the measured carrier and offset power levels in the
table are presented. (Data in the graphical chart is always presented in dBm for
the carrier and dBc for the offsets.)
To select Meas Type:
 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 86.
 Learn about Averaging on page 86.
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.
92
More
Meas Type
– Integrated carrier power is represented in dBm, and
Total Pwr Ref
o
relative powers between offsets and carrier are represented as dBc (dB
below the carrier).
PSD Ref (Power Spectral Density) – Integrated carrier power is
o
normalized to a 1 Hz density as dBm/Hz using a similar algorithm as Noise
Marker. Learn more about the Noise Marker on page 81.
– dB or dBc value is computed by subtracting the measured carrier
Auto
power from the measured offset power.
– dB or dBc value is computed by subtracting the entered RefValue from
Man
the measured offset power.
Press
Ref Value
o
Then enter a value to be used to reference the data using the numeric
o
keypad, ▲|▼ arrows, or the rotary knob.
N9912A FieldFox User's Guide