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SDG7000A User Manual
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Step
The output signal frequency varies in a stepped manner from the start
frequency to the end frequency. The frequency points are controlled by the
“Step Number”.
10.3.2 Trigger Source
The three trigger sources used for sweep are internal, external, and manual and are described
in detail in the following table.
Table 10-13 Trigger sources for frequency sweep
Trigger source
Description
Internal
The sweep cycle is controlled by the internal timer
External
The signal generator receives the trigger input on the rear panel and
outputs a frequency sweep every time it receives the trigger edge(rising or
falling edge determined by the edge setting) of a CMOS pulse.
When the trigger signal arrives, the signal generator outputs the carrier of
the start frequency. After the start hold time, it starts sweeping. The
frequency changes from the start frequency to the stop frequency then
maintains the stop frequency until the end hold time has expired. Then it
outputs the offset value, and starts frequency sweeping again after the
back time has expired.
Manual
When the trigger source is manual, a trigger button will appear on the
parameter page, and the frequency sweep will be output every time the
button is pressed.
When the trigger signal arrives, the signal generator outputs the carrier of
the start frequency. After the start hold time, it starts sweeping, the
frequency changes from the start frequency to the stop frequency, then
maintains the stop frequency for the end hold time. And then outputs the
offset value, and starts frequency sweeping again after the back time has
expired.
10.3.3 Sweep Parameter Settings
The sweep parameters and their detailed descriptions are shown in the following table.
Table 10-14 Parameters and description of the sweep
Scanning
parameters
Description
Sweep time
The time spent from the start frequency sweep to the stop frequency.
Start Hold Time
The time that the output signal maintains the starting frequency before
sweeping.
End Hold Time
The time that the output signal maintains the stop frequency after finishing
sweeping.
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