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44 Agilent E1441A Application Information
Chapter 2
start frequency to the stop frequency. The number of frequency points in the
sweep depends on the sweep time you select and is automatically calculated
by the function generator.
Sweep time: 1 ms to 500 seconds. The default is 1 second.
The function generator computes between 2,048 and 4,096 frequency points
from the start frequency to the stop frequency.
Use the following command to set the sweep time:
SWEep:TIME <seconds>|MINimum|MAXimum
Sweep Mode You can sweep with either linear or logarithmic spacing. The output
frequency of a linear sweep changes linearly during the duration of the
sweep. For logarithmic spacing, the output frequency changes exponentially
during the duration of the sweep.
Sweep mode:
Linear or Logarithmic. The default is Linear.
Use the following command to set the sweep mode:
SWEep:SPACing LINear|LOGarithmic
Sweep Trigger Source External Sources
In the triggered sweep mode (TRIG:SOUR other than IMMediate), the
function generator outputs a single sweep each time a trigger is received.
After one sweep from the start frequency to the stop frequency, the function
generator waits for the next trigger while outputting the start
frequency.Figure 2-8 shows the frequency sweep operation with "external"
trigger (IMMediate, EXTernal, TTLTRG<n>, or BUS). The default is IMM.
Internal Source
When the internal trigger source is selected (TRIG:SOUR IMMediate), the
function generator repeatedly outputs a frequency sweep at a rate
Figure 2-8. Frequency Sweep with "EXTernal" Trigger
sweep start
frequency
begin sweep begin sweep
idle at start
frequency
sweep stop
frequency
Frequency Sweep Output
Sweep Trigger Signal
(TRIG:SOUR is EXT|
BUS|TTLTRG<N>)