Agilent Technologies E4406A, User Manual

Page: 112 / 230

112 Chapter 4
Making Measurements
Making the Adjacent Channel Power (ACP) Measurement
Rel Lim (PSD)- Allows you to enter a relative limit value of
the power spectral density level ranging from
−
150.00 to
+50.00 dB with 0.01 dB resolution. The default is
−
28.87 dB for
Offset A and
−
43.87 dB for offset B.
Offset Adv - Allows you to access the menu to change the
following advanced offset parameters:
Sweep Time
Data Points
- Allows you to select the number of data points.
The automatic mode chooses the optimum number of points for
the fastest measurement time with acceptable repeatability.
The minimum number of points that could be used is
determined by the sweep time and the sampling rate. You can
increase the length of the measured time record (capture more
of the burst) by increasing the number of points, but the
measurement will take longer.
Res BW
- informational only
Num FFT Seg - The automatic mode selects the optimum
number of FFT segments to measure the offset, while making
the fastest possible measurement.
Relative Att - Allows you to set a relative amount of
attenuation for the measurements made at your offsets. The
amount of attenuation is always specified relative to the
attenuation that is required to measure the carrier channel.
Since the offset channel power is lower than the carrier
channel power, less attenuation is required to measure the
offset channel and you get wider dynamic range for the
measurement.
• Meas Type - Allows you to access the menu to select one of the
measurement reference types.
Total Pwr Ref - Sets the reference to the total carrier power.
PSD Ref - Sets the reference to the mean power spectral density
of the carrier.
• Spectrum Trace
Turns off the spectrum trace data calculations. This is only
applicable when using the Spectrum View. It speeds up the display
of the other measured data values by not calculating the spectrum
trace.