Agilent Technologies FieldFox N9912A, Руководство пользователя

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SA (Spectrum Analyzer) Mode 103
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
More

Then
Meas Type

Then choose from the following:
o
Total Pwr Ref
– Integrated carrier power is represented in dBm, and
relative powers between offsets and carrier are represented as dBc (dB
below the carrier).
o
PSD Ref
(Power Spectral Density) – Integrated carrier power is
normalized to a 1 Hz density as dBm/Hz using a similar algorithm as Noise
Marker. Learn more about the Noise Marker on page 92.
For both Meas Types, choose the reference for the offset data.
 Auto
– dB or dBc value is computed by subtracting the measured carrier
power from the measured offset power.
 Man
– dB or dBc value is computed by subtracting the entered RefValue from
the measured offset power.
o
Press
Ref Value
o
Then enter a value to be used to reference the data using the numeric
keypad,
▲|▼
arrows, or the rotary knob.
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 97.

Learn about Averaging on page 97.
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.