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Making Measurements
Using the Swept List Mode to Test a Device
8. To maximize the dynamic range in the stopband (increasing the incident power and
narrowing the IF bandwidth), press:
9. Press .
Calibrate and Measure 1. Remove the DUT and perform a full two-port calibration. Refer to Chapter 6,
“Calibrating for Increased Measurement Accuracy.”
2. With the thru connected, set the scale to autoscale to observe the benefits of using
swept list mode.
• The segments used to measure the stopbands have less noise, thus maximizing
dynamic range within the stopband frequencies.
• The segment used to measure the passband has been set up for faster sweep speed
with more measurement points.
Figure 1-56 Calibrated Swept List Thru Measurement
3. Reconnect the filter and adjust the scale to compare results with the first filter
measurement that used a linear sweep.
In Figure 1-57, notice that the noise level has decreased over 10 dB, confir ming t hat the
noise reduction techniques in the stopbands were successful. Also, notice that the
stopband noise in the third segment is slightly lower than in the first segment. This is
due to the narrower IF bandwidth of the third segment (300 Hz).
MORE
SEGMENT POWER
10 x1
SEGMENT IF BW
300 x1
RETURN
DONE
DONE
LIST FREQ [SWEPT]