Rohde & Schwarz R&S UPP, Руководство пользователя

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Instrument Functions
R&S
®
UPP
240 User Manual 1411.1055.32 ─ 10
5.6.3 Multisine
The generator generates a multitone signal with up to 32 sine
‑
wave tones. The fre-
quency, level and phase can be selected for each tone. However, it is also possible to
optimize the phase so that the ratio of peak value to RMS value is minimal. Optimiza-
tion is often required in the case of noise-like signals. Owing to the absence of associ-
ated windowing, linking the frequency grid of the multi-sine wave to the resolution of
the FFT allows extremely fast frequency response measurement.
Function
Selects the multi sine signal.
Remote command:
SOURce:FUNCtion
on page 697
MULTisine
Spacing
Used to set the frequency grid. The frequency of each sine-wave line is an integer mul-
tiple of this frequency grid.
"Def" The frequency grid can be freely defined.
Minimum value: Sampling rate/262144
"Anl Trk" The frequency grid is adopted from the FFT set in the analyzer. This
value depends on the sampling rate and the size of the FFT. This set-
ting is only possible if an FFT or Post FFT is selected in the analyzer.
The parameter field for entering values is then hidden.
Remote command:
SOURce:RANDom:SPACing:MODE
on page 704
SOURce:RANDom:SPACing:FREQuency
on page 704
Voltage Mode
Used to select the entry mode for the voltages of the individual sine-wave tones.
"Equal" All sine-wave lines have the same amplitude. It is entered in the "Volt
No1" parameter field.
"Define" A separate amplitude can be defined for each sine-wave line.
Remote command:
SOURce:FUNCtion:MODE
on page 703
Crest Factor
The "peak value to RMS value" ratio (crest factor) of the signal can be influenced by
the phase of the individual sine-wave lines.
"Optimized" The ratio of peak value to RMS value of the signal is minimized.
"Define Phase" The start phase of each sine-wave line can be defined.
Remote command:
SOURce:VOLTage:CREStfactor:MODE
on page 704
Generator Signals