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Measurements and Results

R&S

FSW

303User Manual 1173.9411.02 ─ 43

X-axis ref level: -10 dBm

X-axis range APD: 100 dB

X-axis range CCDF: 20 dB

Y-axis upper limit: 1.0

Y-axis lower limit: 1E-6

Remote command:

CALCulate<n>:STATistics:PRESet on page 971

Adjust Settings

Adjusts the level settings according to the measured difference between peak and min-

imum power for APD measurement or peak and mean power for CCDF measurement

in order to obtain maximum power resolution. Adjusts the reference level to the current

input signal.

Remote command:

CALCulate<n>:STATistics:SCALe:AUTO ONCE on page 972

7.8.6 How to Perform an APD or CCDF Measurement

The following step-by-step instructions demonstrate how to perform basic statistic

measurements.

For remote operation, see Chapter 14.5.9.7, "Programming Example: Measuring Sta-

tistics", on page 975.

To start a basic statistic measurement

1. Press the [MEAS] key, then select the "APD" or "CCDF" measurement.

2. Start a sweep.

As soon as the defined number of samples have been measured, the statistical

evaluation is displayed.

To perform a statistic measurement using gate ranges

For pulsed signals, the transmission intervals should not be included in the statistical

evaluation. Thus, you must define gate ranges to be included in the measurement.

1. Press the [MEAS Config] key, then select the "APD Config" or "CCDF Config" soft-

key.

The "APD""APD" or "CCDF" dialog box is displayed.

2. Select the "Edit Gate Ranges" button.

3. Define the time period for which the input signal is to be analyzed, for example the

duration of 3 signal pulses.

Statistical Measurements (APD, CCDF)

R&S FSW Series User Manual

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