Tutorial 7
Keysight 33210A User’s Guide 361
Frequency Sweep
Frequency sweeping is similar to FM but no modulating waveform is use
d. Instead,
the function generator sets the output frequency based on either a linear or
logarithmic function. In a linear sweep, the output frequency
changes in a
constant “hertz per second” manner. In a
logarithmic
sweep
, the output frequency
changes in a constant “octaves per second” or “decades per second” manner.
Logarithmic sweeps are useful for covering wide frequency ranges where
resolution at low frequencies could be lost with a linear sweep.
You can generate a sweep using an internal trigger source or an external
hardware trigger source. When this source is selected, the function generator
outputs a continuous sweep at a rate determined by the sweep time specified.
When the external source is selected, the function generator will accept a
hardware trigger applied to the rear-panel Trig In connector. The function
generator initiates one sweep each time Trig In receives a TTL pulse.
A sweep consists of a finite number of small frequency steps. Since each step
takes the same amount of time, longer sweep times result in smaller steps and
therefore better resolution.
The number of discrete frequency points in the sweep is
automatically
calculated by the function generator and is based on the sweep
time you select.
Frequency Sweep
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