The preamplifier can be turned on and off by pressing the Amplitude main menu key, then selecting the Preamp On/Off submenu key. The Preamplifier option is standard in most Anritsu instruments and is available in other instruments as Option 8.
Figure 2‑2 and Figure 2‑3 show the same signal with the preamplifier off and then on. Notice that when the preamplifier is turned on, the noise floor drops significantly allowing spectral regrowth components that were lost in the noise without the preamplifier to become easily visible.
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