Rohde & Schwarz R&S UPP, Руководство пользователя

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Instrument Functions
R&S
®
UPP
398 User Manual 1411.1055.32 ─ 10
5.23.5 DFD
DFD is a difference-tone factor analysis which determines the intermodulation products
generated by two sine-wave signals of the same amplitude. Depending on the selected
measurement mode, the R&S
UPP measures the 2nd or 3rd order intermodulation
products selectively in accordance with DIN IEC 60268 Part 3. Measurements are
therefore largely unaffected by noise. The arithmetical center frequency of the double-
tone signal should be selected from the third-octave band (5, 6.3, 8, 10, 12.5, 16, 20
kHz) and the frequency difference should preferably be 80 Hz.
The "DFD" signal function of the internal universal generator is recommended as the
signal source . This allows the center frequency and difference frequency (for IEC
60268) and the upper frequency and difference frequency (for IEC 60118) to be varied.
Furthermore, it is also possible to sweep the center frequency and upper frequency.
For alternative intermodulation measurement, see Chapter 5.23.4, "MOD DIST" ,
on page 396.
For more distortion measurements, see Chapter 5.23, "Distortion Measurements" ,
on page 381.
Function (DFD)
Selection of DFD measurement.
Remote command:
SENSe[1]:FUNCtion DFD
Meas Mode
Used to select the order of the intermodulation products and the measurement stan-
dard.
Distortion Measurements