Rohde & Schwarz ESW Series, User Manual

Page: 198 / 759

Common Analysis and Display Functions
R&S
®
ESW
198 User Manual 1177.6298.02 ─ 08
11.3.1 Basics on Traces
● Working with Trace Detectors ............................................................................... 198
● Analyzing Several Traces - Trace Mode ............................................................... 203
● Working with Spectrograms .................................................................................. 204
11.3.1.1 Working with Trace Detectors
A trace displays the values measured at the measurement points (also known as
sweep points in some applications). Usually, however, the number of measurement
points considered during a measurement is much larger than the number of measure-
ment points that can be displayed simultaneously.
For more information on measurement points, see Chapter 9.3.1.2, "Calculating the
Number of Measurement Points" , on page 103.
Example:
Consider the following configuration:
●
Start frequency: 150 kHz
●
Stop frequency: 30 MHz
●
Step size: 4 kHz
●
Measurement time: 100 ms
With said settings, the R&S ESW measures with a dwell time of 100 ms every 4 kHz,
so the number of measurement points in that example would be about 7500.
The trace detector's task is to find a good way to combine the measurement points.
The result obtained from the selected detector for any measurement point is displayed
as the value at this frequency point in the trace.
video
signal
s1 s2 s3 s4 s5 s6 s8 s1
video
signal
s1 s2 s3 s4 s5 s6 s8 s1
Measurement point n
Video
Signal
Meas. point n+1
MAX PEAK
AUTO PEAK
MIN PEAK
SAMPLE
RMS
AVG
The detectors of the R&S ESW are implemented as digital devices. All detectors work
in parallel in the background, which means that the measurement speed is independ-
ent of the detector combination used for different traces.
Trace Configuration