Agilent Technologies 8935 series e6380a Manuale Utente

Analog Measurements - Screens and Control Fields

AF analyzer gain control specifies whether the AF analyzer’s gain 
settings are controlled automatically by AF autoranging (

), or by 

manual control (

). 

The following settings are affected by AF autoranging: 

• Input Gain 

• De-Emp  Gain 

• Notch  Gain 

The normal mode of operation for the 

 field is 

, allowing 

the instrument to adjust the AF gain settings for optimum 
measurement accuracy. 

This field can be set to 

 to disable the autoranging routines to 

increase measurement speed. However, this requires you to select the 
desired gain settings manually for each measurement. 

Autoranging Interference   After a signal is input, the RF 
autoranging function (

) takes a small amount of time to determine 

the required input attenuator setting. If your transmitter begins 
sending information the instant it transmits, the initial part of the 
demodulated signal may not appear on the oscilloscope. When trying to 
capture the initial modulation waveform of a signal on the oscilloscope, 
set the upper field to 

 and set the lower field to an appropriate level 

for the signal being decoded (start with 40 dB).

Setting the upper field to 

 also prevents the RF autoranging 

process from interrupting spectrum analyzer operation when a signal is 
first measured. This can be helpful when you need to see the signal the 
instant the source is input, but requires you to set the needed amount of 
input attenuation. 

AF ANALYZER

This field selects the desired IF filter bandwidth for modulated signals 
being analyzed. 

RF ANALYZER