Using 0 Db Attenuation; Decreasing Resolution Bandwidth - HP 8590 E-Series User Manual

attenuation. Increasing the attenuation moves the noise floor closer to the signal.
A "#" mark appears next to the AT annotation at the top of the display, indicating the
attenuation is no longer coupled to other spectrum analyzer settings.
7. To see the signal more clearly, press 0 m. Zero attenuation makes the signal more visible.
(As a precaution to protect the spectrum analyzer input mixer, 0 dB RF attenuation can be
selected only with the number/units keypad.)
Before connecting other signals to the spectrum analyzer input, increase the RF attenuation to
protect the spectrum analyzer input mixer: press ATTEN AUTO MAN so that AUTO is underlined
or press and AUTO ALL.
Example: The resolution bandwidth can be decreased to view low-level signals.
1. As in the previous example, connect an antenna to the spectrum analyzer input. Set the
spectrum analyzer to view a low-level signal.
2. Press Isw) then a. The low-level signal appears more clearly because the noise level is
reduced. See Figure 3-18.
Figure 3-18. Decreasing Resolution Bandwidth
3-16 Making Basic Measurements
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Figure 3-17. Using 0 dB Attenuation
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