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52 Chapter 1
Making Basic Measurements
Making Noise Measurements
Figure 1-42 Setting the Attenuation
8. Activate the noise marker by pressing Marker, More, Function,
Marker Noise.
Note that the display detection automatically changed to “Avg”
which can be manually set by pressing Det/Demod,
Average (Video/RMS). The marker is floating between the maximum
and the minimum of the noise. For firmware revisions earlier than
A.08.00, the detection type when using
Marker Noise changed to
sample. If you wish to use sample detection, press
Det/Demod,
Detector, Sample and verify that “Average Type” is set to “Video
average” by pressing BW/Avg, Average Type, Video Avg. This is not
recommended as it is slower and does not increase accuracy.
The marker readout is in dBm(Hz) or dBm per unit bandwidth. See
Figure 1-43. For noise power in a different bandwidth, add
. For example, for noise power in a 1 kHz bandwidth, add
or 30 dB to the noise marker value.
10 log× BW()
10 log 1000()×