5-10
Optimizing Measurement Results
Increasing Sweep Speed
that tracks the receiver frequency because the receiver is sweeping. The delayed signal will be attenuated
because the center of the internal IF filter has moved.
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 previous procedure.
2. Make the measurement and save the data trace to memory:
and
3. Then switch to stepped list mode:
• If there is no difference between the measurements in either list mode, then use the swept list mode.
• If the memory trace indicates that there is more attenuation in swept list mode, it may be due to IF
delay. You can usually remedy this problem by increasing the sweep time.
NOTE IF bandwidths of 30 to 10 Hz cause the sweep (or that segment of the sweep) to always be
stepped, thus eliminating IF delay.
To Decrease the Frequency Span
The hardware of the network analyzer sweeps the frequency range in separate bands, where switching from
band to band takes time. Modify the frequency span to eliminate as many band switches as possible while
maintaining measurement integrity. Refer to the following table to identify the analyzer's band switch
points:
To Set the Auto Sweep Time Mode
Auto sweep time mode is the default mode (the preset mode). This mode maintains the fastest sweep speed
possible for the current measurement settings.
• Press , to re-enter the auto mode.
Tab le 5-3 Band Switch Points
Band Frequency Span Band Frequency Span
0 0.01 MHz to 0.3 MHz 7 178 MHz to 296 MHz
1 0.3 MHz to 3.3 MHz 8 296 MHz to 536 MHz
2 3.3 MHz to 16 MHz 9 536 MHz to 893 MHz
3 16 MHz to 31 MHz 10 893 MHz to 1.607 GHz
4 31 MHz to 61 MHz 11 1.607 GHz to 3 GHz
5 61 MHz to 121 MHz 12 (Option 006) 3 GHz to 4.95 GHz
6 121 MHz to 178 MHz 13 (Option 006) 4.95 GHz to 6 GHz
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