Instrument Function
R&S
®
SMU200A
202Operating Manual 1007.9845.32 ─ 15
f) If "Frequency Range" in Narrow Mode does not, select “Wide” for the Frequency
Range and check the Phase Continuous Active box
3. In the "RF Frequency Sweep" dialog
a) Modify the "Start Freq" and "Stop Freq" or "Center Frequency" and "Span" as
needed.
b) Set the RF frequency sweep State to “ON”.
Optimum user settings for the phase continuous frequency sweep
In the "RF Frequency Sweep" dialog there are some settings that will improve the phase
continuous sweep results for both "Narrow" and "Wide" mode choices.
1. "Step Lin": low step size
In order to get the best spur performance during frequency change, it is recommen-
ded to reduce the step size and (if necessary) increase the sweep speed by decreas-
ing the Dwell Time. Effectively, the sweep will be performed in the same amount of
time, but with smaller step sizes.
2. "Shape": Triangle sweep
The triangle sweep offers a uniform forward sweep and return to the beginning fre-
quency. The saw tooth sweep produces a uniform forward sweep with an abrupt reset
to the starting frequency. The abrupt reset can generate spurs.
Phase Continuous Frequency Settings Menu
The "Phase Continuous Frequency Settings" are available in the middle section of the
"Frequency/Phase" dialog.
Phase Continuous Active
Activates/deactivates phase continuous frequency settings. For a given RF frequency
setting, phase continuous frequency changes are possible in a limited frequency range.
An overview of the frequency ranges is provides the table in "Frequency Range - RF
Signal" on page 203.
For instrument without option B22:
The range is typically +/-0.5 MHz in the main synthesizer octave of 750 MHz to 1.5 GHz.
Note: If "Phase Continuous" is "Active" a setting of the "RF Frequency" outside the avail-
able "Frequency Range" causes an error. A settings conflict is displayed.
For instrument with option B22:
The frequency range is indicated in the table table in section "Frequency Range - RF
Signal" on page 203. The range indication is active even if phase continuous frequency
setting is not yet activated. Thus, the desired range can be determined before activating
the function. Two modes are available.
RF Signal and Analog Modulations - RF Block
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