Agilent Technologies E5071C Manual page 381

E5071C
In the stepped mode, a certain time should be allowed until the frequency
becomes stable at each measurement point, since the frequency is
changed stepwise. Therefore, the sweep time in the swept mode is
generally shorter than that in the stepped mode. However, if the
measurement point interval is extremely large, the sweep to the next
measurement point frequency cannot be completed within the sampling
time due to the limitations of the instrument's frequency sweep speed. This
causes a certain waiting time until the start of measurement of the next
measurement point, and thus in this case the swept mode actually has a
longer sweep time.
Although there is some difference depending on the IF bandwidth setting,
when the measurement point interval is approximately 30 MHz or less, the
sweep time in the swept mode is shorter than that in the stepped mode.
When you use the swept mode, you should confirm that there is no
measurement-related problem before performing the actual measurement.
The swept mode has the following disadvantages.
•
DUTs with long electrical delay time cannot be measured correctly.
•
For more information, refer to Notes for measuring DUTs with long
electrical delay time
Trace noise may increase compared to the stepped mode because
•
sampling is performed while sweeping the frequency.
The specifications are not guaranteed
•
Notes for measuring DUTs with long electrical delay time
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