Rohde & Schwarz CMW500 - Real-Time and Arbitrary (ARB) Generators

System Overview
R&S
®
CMW500
53User Manual 1173.9463.02 ─ 06
With a total external attenuation of x dB, the generator power is increased by x dB so that
the actual generator power differs from the output power shown in the dialog. The output
power in the dialog is available at the input of the DUT. Negative values of the external
attenuation decrease the effective generator power.
Frequency-independent attenuations are defined as part of the generator settings, refer
to the description of the generator application. Frequency-dependent correction tables
are administrated and activated/deactivated only via remote commands
(...:FDCorrection:...).
While a correction table is active for the connector currently used by an application, the
GUI of the application displays the table name together with the frequency-independent
attenuation setting.
The table entries can be displayed by clicking the button "FDCorr!".
3.1.3 Real-Time and Arbitrary (ARB) Generators
The properties of real-time generator signals are based on the settings in the generator
configuration dialogs. An example for a real-time signal (dual-tone GPRF signal) is
described in section chapter 2.3.1, "Generating an RF Signal", on page 27.
In contrast, the arbitrary (ARB) generator signal is based on a "waveform file" (typically,
a file generated with R&S WinIQSIM) which is loaded and processed at runtime. For
details refer to the "GPRF Generator" description.
The R&S CMW500 provides real-time and ARB generator signals for many network
standards. Both generator types have their specific advantages.
Use an ARB generator if you wish to:
●
Utilize the flexibility of R&S WinIQSIM2 in configuring the signal properties
●
Re-use signal that you have once configured
●
Quickly alternate between signals with different properties (multi-segment files)
Use a real-time generator if you wish to:
●
Quickly re-configure signals and test the effects without loading a new waveform file
●
Generate signals with arbitrary length (e.g. for the transmission of long PRBS sequen-
ces)
●
Use dynamic features such as TPC sequences for WCDMA tests
Generators