Rohde & Schwarz SMW200A - Selecting a Suitable Acquisition Method

Monitoring Signal Characteristics
R&S
®
SMW200A
591User Manual 1175.6632.02 ─ 16
1 = Baseband A/B/C/D/E/F/G/H
2 = BB Input A/B
3 = Fading Input A/B/C/D
4 = Fading Output A/B/C/D
5 = AWGN Input A/B/C/D
6 = Stream A/B/C/D/E/F/G/H
7 = output: I/Q Out 1/2
8 = output: Dig Out 1/2
9 = output: RF A/B
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Depending on the current routing, the signal at the input of the fading blocks (3)
can be:
– One of the basebands
– The sum product of the corresponding internal baseband and externally applied
digital baseband signal (BB input).
Enabled power offsets are considered.
●
The signal at the fading output (4) is the faded signal if fading is enabled or the
sum product of the input signals if summation after the fading is performed.
Enabled power offset is considered.
●
The signal measured at the acquisition points "Stream A/B/C/D" (6) is the signal
after the AWGN block. Depending on the AWGN settings, performed are measure-
ment on interference-free digital I/Q baseband signal or the signal superimposed
by the noise generator AWGN.
●
The points 7, 8 and 9 represent the possible outputs for the corresponding analog,
digital or RF output. The measured values are displayed in the current units of the
corresponding output.
Enabled power offsets are considered (see also Chapter 8.2.2.4, "Understanding
the Displayed Measurement Results", on page 593).
8.2.2.3 Selecting a Suitable Acquisition Method
The provided measurement results are based on signal measurement with different
acquisition methods. Select the acquisition method most fitting to your current task.
Depending on whether the displayed power values are pre-calculated or measured,
there are two acquisition approaches:
●
Static results
In "Nominal" acquisition mode, the displayed power and peak values are statistical
theoretical values as calculated by the instrument.
●
Measured results
– "Continuous"
The displayed power values are determined upon analysis of the complete sig-
nal. The sweep time of the performed measurement is selectable, see "Sweep
Time/Duration" on page 596.
This acquisition method is suitable for measurements of continuous signals, the
sum product of correlated signals, and time varying signals
– "Gated"
The displayed single RMS and peak values are determined upon evaluation of
a specific signal segment; the values are the result of one measurement of sig-
Querying Information on the Baseband Power Levels