Varying the RF Signal in List or Sweep Mode
R&S
®
SMA100B
109
User Manual 1178.3834.02 ─ 03
5 Varying the RF Signal in List or 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 arbitrarily repeated.
The R&S
SMA100B supports two basic methods:
●
Sweep
mode
The instrument generates an RF signal which varies its frequency or level values
cyclically between the start and end values. The values change according to a pre-
defined waveform. Intermediate values are calculated internally by linear or loga-
rithmic interpolation.
Figure 5-1: Schematic representation of a signal generated in sweep mode (RF Freq Sweep)
The main application field of the "Sweep" mode is to determine the frequency
response or level-dependent behavior of the DUT.
●
List
mode
The instrument generates the signal step-by-step, based on frequency and ampli-
tude value pairs with individual step sizes. While in sweep mode the frequency
or
the level values change, in list mode you can vary
both parameters simultane-
ously
. The frequency and level values do not need to have ascending or descend-
ing 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 vary the dwell time for each value pair.
In this mode, the graph represents the frequency and power value pairs, and the
dwell time of the corresponding index entry of the list mode table.
