Rohde & Schwarz FSW13, User Manual

Page: 452 / 1150

Common Analysis and Display Functions
R&S
®
FSW
452 User Manual 1173.9411.02 ─ 19
● Basics on Setting up Traces ................................................................................. 452
● Trace Configuration ...............................................................................................464
● How to Configure Traces ...................................................................................... 477
7.3.1 Basics on Setting up Traces
Some background knowledge on traces is provided here for a better understanding of
the required configuration settings.
Each trace represents an analysis of the measured data. Up to 6 traces can be dis-
played in each window, and up to 16 windows can be displayed on the screen. So, in
theory, you can analyze the data measured by the R&S
FSW in almost 100 different
ways simultaneously!
Trace settings are stored on the instrument for each window. So when you switch to a
different window, the trace settings previously configured for that window are restored.
● Mapping Samples to Sweep Points with the Trace Detector ................................ 452
● Analyzing Several Traces - Trace Mode ...............................................................455
● How Many Traces are Averaged - Sweep Count + Sweep Mode .........................456
● How Trace Data is Averaged - the Averaging Mode .............................................457
● Combining Several Trace Results - Trace Math Evaluation ................................. 457
● Working with Spectrograms .................................................................................. 458
7.3.1.1 Mapping Samples to Sweep Points with the Trace Detector
A trace displays the values measured at the sweep points. The number of samples
taken during a sweep is much larger than the number of sweep points that are dis-
played in the measurement trace.
Example:
Assume the following measurement parameters:
●
Sample rate: 32 MSamples / s
●
Sweep points: 1000
●
Sweep time: 100 ms
●
Span: 5 GHz
During a single sweep, 3.2 * 10
6
samples are collected and distributed to 1000 sweep
points, i.e. 3200 samples are collected per sweep point. For each sweep point, the
measured data for a frequency span of 5 MHz (span/<sweep points>) is analyzed.
Note that if you increase the number of sweep points, the frequency span analyzed for
each point in the trace decreases, making the result more stable.
See also
chapter 6.5.1.8, "How Much Data is Measured: Sweep Points and Sweep
Count" , on page 407.
Obviously, a data reduction must be performed to determine which of the samples are
displayed for each sweep point. This is the trace detector's task.
The trace detector can analyze the measured data using various methods:
Trace Configuration