HP 8753E manual Calibrate and Measure, Kg&’, Press iJk&~ ~~~~~~~~~~~~~h

8.Tbmaximiz e the dynamic range in the stopband (increasing the incident power and narrowing the IF bandwidth), press:

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Calibrate and Measure

1.Remove the DUT and perform a full two-port calibration. Refer to Chapter 5, “Optimizing Measurement Results. n

2.With the thru connected, set the scale to autoscale to observe the benefits of using swept list mode.

n The segments used to measure the stopbands have less noise, thus maxinUng dynamic range within the stopband frequencies

n The segment used to measure the passband has been set up for faster sweep speed with more measurement points.

CENTER 900.000 000 MHZ SPAN 500.000 000 MHZ

Figure Z-52. 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.

n In Figure 2-53, notice that the noise level has decreased over 10 dB, conllrming that the noise reduction techniques in the stopbands were successful

n In Figure 2-53, 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).

244 Making Measurements