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.
The preamplifier can be turned on and off by pressing the Amplitude main menu key, then selecting the Preamp On/Off submenu key.
Figure: Preamplifier On and Off show the noise floor with the preamplifier off (green trace) and on (yellow trace). Notice that when the preamplifier is turned on, the noise floor drops significantly.
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