Configuring the Signal in the RF Domain
R&S
®
SMW200A
467User Manual 1175.6632.02 ─ 16
You can use the "Retrace" function if "Sweep > Mode = Single/External Single" and
"Shape = Sawtooth", see:
●
" Shape " on page 479
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"Mode" on page 476
7.6.2 About Sweep Mode
In sweep mode, the signal generator scans the sweep range gradually from one point
to another, using a defined step width and following a triangle or sawtooth shape. This
mode also enables you to change direction, that means, it is possible to step back-
wards.
See Chapter 7.6.2.2, "Sweep Signal Shapes", on page 469.
Configuration and operation of sweep mode signals
●
The R&S SMW generates a sweep signal by varying one of the following parame-
ters: the RF frequency, the LF frequency or the RF level.
●
In all sweep modes, you can perform a complete sweep cycle once, repeat the
cycle continuously or step through it gradually.
●
The instrument generates the sweep signal according to the settings of the associ-
ated sweep.
●
The "Reset Sweep" function sets the sweep to the start value.
Impact of changing the sweep mode during performance
If you change the sweep mode during the execution, the signal generator stops the
sweep and starts with the next trigger event at the initial value.
7.6.2.1 Correlating Parameters in Sweep Mode
A sweep signal is a periodic signal that changes its frequency or level from a starting
value to an ending value in a defined time.
The R&S SMW provides various possibilities to configure a sweep signal. For example,
you can determine the sweep range by the start and end values, or based on the start
value and span. In any case, related parameters are adjusted accordingly.
The formulas below show how the sweep parameters correlate and the corresponding
calculation basis, by the frequency and offset settings. Apart from "Center Frequency",
"Span" and "Step_lin", the values apply accordingly to the level settings.
Table 7-8: Variables that are used in the following formulas
Variable Description
Sweep range Defined frequency or level value range
f
CENTer
Defined center frequency
f
SPAN
Defined extend of the sweep range
Varying the RF Signal in List or Sweep Mode
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