User`s manual

Arming and Triggering Frequency Sweeps and Lists
Frequency sweeps and lists are started and advanced using the arm and
trigger signals described in this section. The commands used to set up the
arming and triggering of sweeps and lists are:
ARM
:SWEep|SEQuence3
:COUNt <
number>
[:IMMediate]
:LINK <
link>
:SOURce <
source>
TRIGger
:SWEep|SEQuence3
[:IMMediate]
:LINK <
link>
:SOURce <
source>
:TIMer <
period>
The frequency sweep and frequency list arming and triggering commands
are frequency coupled. Thus, they are executed in the sequence shown in
the flowchart in Figure 4-1 on page 118.
Frequency Sweeps
Using Triggers
The AFG can output frequency sweeps each time it is triggered. However,
the maximum sweep time and frequency steps depend on the number of
waveform repetitions and the average sweep frequency.
To determine the maximum sweep time (
[SOURce:]SWEep:TIMe <number>),
divide the number of waveform repetitions to be output (i.e., maximum
is 66536) by the average frequency. For example:
STARt frequency is: 1 kHz
STOP frequency is: 1 MHz
then
sweep time = 66536 / ((1000 +1000000) / 2) = 66536/500,500 = .1329
To determine the maximum number of frequency steps (or points)
(
[SOURce:]SWEep:POINts <number>), divide the sweep time by the
minimum time between frequency points (i.e., .00125 S). For example,
using the above calculated time:
.1329 / .00125 = 106 points
The SWP_TRIG program shows how to output a sweep using a user
selected trigger mode.
186 Arming and Triggering Chapter 5