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Increasing Sweep Speed
You can increase the analyzer sweep speed by avoiding the use of some features that require
computational time for implementation and updating, such as bandwidth marker tracking.
You can also increase the sweep speed by making adjustments to the measurement settings.
The following suggestions for increasing sweep speed are general rules that you should
experiment with:
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use swept list mode
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decrease the frequency span
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set the auto sweep time mode
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widen the system bandwidth
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reduce the averaging factor
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reduce the number of measurement points
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set the sweep type
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use chop sweep mode
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use external calibration
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fast Z-port calibration mode
To
Use Swept List Mode
When using a list frequency sweep, choosing swept list mode can increase throughput by
up to 6 times over stepped list mode. This mode takes data while sweeping through each
list segment. In addition, this mode expands the list table to include test port power and IF
bandwidth. Selectable IF bandwidths can increase the throughput of the measurement by
allowing the user to specify narrow bandwidths only where needed.
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For in-depth information on swept list mode, refer to “Swept List Frequency Sweep” in
Chapter 6, “Application and Operation Concepts.
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For more information on making measurements with swept list mode, refer to “Measurements
Using the Swept List Mode” in Chapter 2, “Making Measurements.”
2. The frequency segments can be
dellned
in any of the following terms:
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start/stop/number of
points/power/IlTBW
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start/stop/step/power/IFBW
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center/span/number of
points/power/IFBW
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center/span/step/power/IFBW
Detecting IF Delay
IF delay occurs during swept measurements when the signal from the analyzer source is
delayed in reaching the analyzer receiver because of an electrically long device. Because the
receiver is sweeping, the delayed signal will be attenuated due to the internal IF filter.
For most measurements, swept list mode will be the optimum choice. If there is any doubt
about the effect of IF delay, perform the following test:
1. Set up the measurement using the swept list mode, as in the above procedure.
2. Make the measurement and save the data trace to memory:
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Optimizing Measurement Results