Rohde & Schwarz Smart Instruments UP300, Operating Manual

Page: 144 / 355

Generator R&S UP300/350
E-1147.2759.00 6-144 Operating Manual, 11/2007
6.2.2.2.6 DFD (Difference Frequency Signal)
Description In the DFD menu, you can set the function parameters for the difference
frequency signal. The signal consists of two very close sinewave signals of
the same amplitude.
The signal is used for intermodulation measurements according to IEC 118
and IEC 268 (
Ê 6-268).
Selecting the
DFD menu 1. Call the generator DFD function ( Ê 6-112).
2. Select the menu with the
3
or
4
cursor keys .
The menu name is highlighted and the function keys [13] are assigned
the appropriate function.
Function key
assignment
Measurement acc. to IEC 118: Enter the upper DFD frequency. ( Ê 6-145)
Measurement acc. to IEC 268: Enter the center frequency. ( Ê 6-147)
Enter the difference frequency. ( Ê 6-145, 6-147)
Enter the total RMS of the signal. (
Ê
6-149)
Enter the reference value. ( Ê 6-118)
Note: To be able to measure the intermodulation for DFD, you must set an
appropriate measurement function in the Analyzer menu ( Ê 6-268).