Functions and Measurements
Measuring a Low-Level Signal
46
A lower attenuation value will mean that more of the signal
strength will be displayed on screen:
Press Amplitude > Attenuation > 0 > dB
Figure 3-11 Measuring a low-level signal using 0 dB Attenuation
Decreasing the Resolution Bandwidth
Resolution bandwidth settings affect the level of internal
noise but have little affect on the displayed level of
continuous wave (CW) signals. Decreasing the RBW by a
decade (factor of ten) reduces the noise floor by 10 dB.
1 Refer to the procedure
“Reducing Input Attenuation” on
page 44
and follow steps 1, 2 and 3.
2 Decrease the resolution bandwidth:
Press BW and
The low- level signal appears more clearly due to the noise
level being reduced by the decrease in RBW (see
Figure 3-12).
FM
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