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Chapter 1 53
Making Basic Measurements
Making Noise Measurements
Figure 1-43 Activating the Noise Marker
9. The noise marker value is based on the mean of 5% of the total
number of sweep points centered at the marker. The points averaged
span one-half of a division. To see the effect, move the marker to the
50 MHz signal by pressing Marker, 50, MHz (or use the front-panel
knob to place marker at 50 MHz). See Figure 1-44.
Figure 1-44 Noise Marker at 50 MHz
10.The marker does not go to the peak of the signal because not all
averaged points are at the peak of the signal. Widen the resolution
bandwidth by pressing BW/Avg, Res BW, 10, kHz (or up arrow) to see
what happens. The marker is now much closer to the peak of the
signal. See Figure 1-45.