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54 Chapter 1
Making Basic Measurements
Making Noise Measurements
NOTE Notice the video bandwidth changed to 100 kHz. The ratio between the
video bandwidth (VBW) and the resolution bandwidth (RBW) must be ≥
10/1 to maintain the accuracy of the measurement.
Figure 1-45 Increased Resolution Bandwidth
11. Return the resolution bandwidth to 1 kHz. Press BW/Avg, 1, kHz.
12. Measure the noise very close to the signal by pressing Marker,
50.0000, MHz (or use the front-panel knob to place the marker). See
Figure 1-46.
Note that the marker reads a value that is too high because some of
the averaged trace points are on the skirt of the signal response.