Common Analysis and Display Functions
R&S
®
FSMR3000
215
User Manual 1179.0116.02 ─ 02
Mapping Samples to measurement Points with the Trace Detector
A trace displays the values measured at the measurement points. The number of sam-
ples taken during a measurement can be much larger than the number of measure-
ment points that are displayed in the measurement trace.
Example:
Assume the following measurement parameters:
●
Sample rate: 32 MSamples / s
●
measurement points: 1000
●
measurement time: 100 ms
●
Span: 5 GHz
During a single measurement, 3.2 * 10
6
samples are collected and distributed to 1000
measurement points, i.e. 3200 samples are collected per measurement point. For each
measurement point, the measured data for a frequency span of 5 MHz (span/<mea-
surement points>) is analyzed.
Note that if you increase the number of measurement points, the frequency span ana-
lyzed for each point in the trace decreases, making the result more stable.
Obviously, a data reduction must be performed to determine which of the samples are
displayed for each measurement point. This is the trace detector's task.
The trace detector can analyze the measured data using various methods:
The detector activated for the specific trace is indicated in the corresponding trace
information by an abbreviation.
Table 8-2: Detector types
Detector
Abbrev.
Description
Positive Peak
Pk
Determines the largest of all positive peak values of the levels measured at the
individual frequencies which are displayed in one sample point
Negative Peak
Mi
Determines the smallest of all negative peak values of the levels measured at
the individual frequencies which are displayed in one sample point
Auto Peak
Ap
Combines the peak detectors; determines the maximum and the minimum
value of the levels measured at the individual frequencies which are displayed
in one sample point
RMS
Rm
Calculates the root mean square of all samples contained in a measurement
point.
Average
Av
Calculates the linear average of all samples contained in a measurement
point.
Sample
Sa
Selects the last measured value of the levels measured at the individual fre-
quencies which are displayed in one sample point; all other measured values
for the frequency range are ignored
The result obtained from the selected detector for a measurement point is displayed as
the value at this frequency point in the trace.
Trace Configuration
