List and Sweep Mode
R&S
®
SMA100B
154User Manual 1178.3834.02 ─ 05
6 List and Sweep Mode
The operating modes "List" and "Sweep" allow you to generate an RF signal having
periodically varying frequencies or amplitudes.
A signal generated with varying parameters scans a certain range of varying values of
a parameter, with defined start and end points, and can be repeated cyclically.
The R&S SMA100B supports two basic methods:
●
Sweep mode
The instrument generates an RF signal which varies its frequency or level values in
discrete steps between the start and end values. The values change according to a
specific shape like sawtooth or triangle. The spacing is linear or logarithmmic.
Figure 6-1: Schematic representation of a signal generated in sweep mode
The main application field of the "Sweep" mode is to determine the frequency
response a DUT.
●
List mode
The instrument generates a varying output signal, based on a previously saved list
with frequency, amplitude and step width values. While in sweep mode the fre-
quency or the level values change, in list mode you can vary both parameters
simultaneously. The frequency and level values do not need to have ascending or
descending order, they can vary arbitrarily.
You can use a global dwell time, which means that the time interval is constant for
all steps of the list, or different dwell times for each value pair.
Figure 6-2 represents the frequency and power value pairs, in this case with the
dwell time set the same for all steps (global dwell time).
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