List and Sweep Mode
R&S
®
SMA100B
163User Manual 1178.3834.02 ─ 05
The Retrace function
Retrace is a function especially designed for "Single" sweep modes, when the sweep
signal follows a sawtooth shape. Working in this mode, the instrument performs a sin-
gle sweep cycle when a trigger event occurs. The signal generation stops at the set
end point (stop frequency or stop level), and waits for the next trigger event.
In this state, the upper value of the signal remains at the output until the next cycle
starts. In particular, if you generate a level sweep signal, the high amplitude of the sig-
nal is output for a certain time. To protect the DUT from overload, the retrace function
immediately resets the signal value to the start value at the end of a sweep cycle. It
returns to the start level or start frequency until the next trigger is applied.
You can use the "Retrace" function if "Sweep > Mode = Single/External Single" and
"Shape = Sawtooth", see:
●
" Shape" on page 173
●
"Mode" on page 172
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 size 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 6.2.2, "Sweep Signal Shapes", on page 166.
About Sweep Mode
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