Measurements and Results
R&S
®
FSW
293User Manual 1173.9411.02 ─ 43
File contents Explanation
File data section
0;9000;150000;1000;79500;-25.006643295288086;-
12.006643295288086;PASS;
0;9000;150000;1000;101022.11126961483;-47.075
111389160156;-34.075111389160156;PASS;
0;9000;150000;1000;58380.171184022824;-47.079
341888427734;-34.079341888427734;PASS;
Measured peak values:
<range number>;
<start frequency>;
<stop frequency>;
<resolution bandwidth of range>;
<frequency of peak>;
<absolute power in dBm of peak>;
<distance to the limit line in dB>; (positive value
means above the limit)
<limit fail (pass = 0, fail =1)>;
7.8 Statistical Measurements (APD, CCDF)
To measure the amplitude distribution, the R&S FSW has simple measurement func-
tions to determine both the Amplitude Probability Distribution (APD) and the Comple-
mentary Cumulative Distribution Function (CCDF). Only one of the signal statistic func-
tions can be switched on at a time.
● About the Measurements......................................................................................293
● Typical Applications...............................................................................................294
● APD and CCDF Results........................................................................................294
● APD and CCDF Basics - Gated Triggering........................................................... 296
● APD and CCDF Configuration.............................................................................. 297
● How to Perform an APD or CCDF Measurement..................................................303
● Examples.............................................................................................................. 304
● Optimizing and Troubleshooting the Measurement.............................................. 307
7.8.1 About the Measurements
The probability of amplitude values can be measured with the Amplitude Probability
Distribution function (APD). During a selectable measurement time all occurring ampli-
tude values are assigned to an amplitude range. The number of amplitude values in
the individual ranges is counted and the result is displayed as a histogram.
Alternatively, the Complementary Cumulative Distribution Function (CCDF) can be dis-
played. It shows the probability that the mean signal power amplitude will be exceeded
in percent.
Only one of the signal statistic functions can be switched on at a time. When a statistic
function is switched on, the R&S FSW is set into zero span mode automatically. The
R&S FSW measures the statistics of the signal applied to the RF input with the defined
analysis bandwidth. To avoid affecting the peak amplitudes the video bandwidth is
automatically set to 10 times the analysis bandwidth. The sample detector is used for
detecting the video voltage.
Statistical Measurements (APD, CCDF)
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