Agilent Technologies HP 8642A/B Spécifications Page 241

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Considerations When Changing the Normalized
Bandwidth
Changing the BW effects the noise data but does not effect the spur level.
The HP 3048A does not normalize marked spurs. However, unmarked
spurs are treated as noise. Spurs are always marked at their actual
level regardless of the normalization bandwidth. For example, changing
the BW from 1 Hz to 10 Hz will raise the plotted noise data by
10 dB (10 log 10 Hz/1 Hz). The level of the marked spurs will not change.
The bandwidth value defined for the measurement is accessed in the
Computed Output display. To re-plot the results in a new BW, enter the
desired bandwidth, press Done then press the Redraw Graph softkey.
What Effect Does Changing the Bandwidth Have on
the Plotted Noise Level?
Increasing the normalization bandwidth causes the plotted noise level
to increase by 10 Log
10
BW. For example, changing the bandwidth
from 1 Hz to 1 kHz will increase the plotted noise level 30 dB.
(10 Log 1000 = 30 dB).
The default noise measurements are normalized to a 1 Hz BW. The units
on the graph for a bandwidth of 1 Hz are dBc/Hz. For a 10 Hz BW
normalization, the units are dBc/10 Hz.
4-16 Normalized Bandwidth
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