7-15
Operating Concepts
Sweep Types
Sweep Types
The following sweep types will function with the interpolated error-correction feature
(described in “Interpolated Error Correction” on page 6-8):
• linear frequency
• power sweep
•CW time
The following sweep types will not function with the interpolated error correction feature:
• logarithmic frequency sweep
• list frequency sweep
Linear Frequency Sweep (Hz)
The softkey activates a linear frequency sweep that is displayed on a standard
graticule with ten equal horizontal divisions. This is the preset default sweep type.
For a linear sweep, sweep time is combined with the channel's frequency span to compute a
source sweep rate:
sweep rate = (frequency span) / (sweep time)
Since the sweep time may be affected by various factors, the equation provided here is
merely an indication of the ideal (fastest) sweep rate. If the user-specified sweep time is
greater than 15 ms times the number of points, the sweep changes from a continuous ramp
sweep to a stepped CW sweep. Also, for 10 Hz or 30 Hz IF bandwidths, the sweep is
automatically converted to a stepped CW sweep.
In the linear frequency sweep mode, it is possible, with Option 010, to transform the data
for time domain measurements using the inverse Fourier transform technique.
Logarithmic Frequency Sweep (Hz)
The softkey activates a logarithmic frequency sweep mode. The source is
stepped in logarithmic increments and the data is displayed on a logarithmic graticule.
This is slower than a continuous sweep with the same number of points, and the entered
sweep time may therefore be changed automatically. For frequency spans of less than two
octaves, the sweep type automatically reverts to linear sweep.
Stepped List Frequency Sweep (Hz)
The softkey activates a stepped list frequency sweep, one of two
list frequency sweep modes. The stepped list mode allows the analyzer to sweep a list of
arbitrary frequency points. This list is defined and modified using the edit list menu and
the edit subsweep menu. Up to 30 frequency subsweeps (called "segments") of several
different types can be specified, for a maximum total of 1601 points.
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