Agilent Technologies 8935 series e6380a manual Input Gain, Spec ANL auxiliary controls menu

Analog Measurements - Screens and Control Fields

Control Fields for Analog Measurements

Input Atten

Input attenuation sets the amount of input attenuation for the RF IN/OUT and ANT IN connectors. This function controls two settings:

•The upper field determines if you want the instrument to set the attenuation automatically (Auto), or if you want to set the value manually (Hold).

•The lower field displays the present attenuation value, and is used to set the desired attenuation level when the upper area is set to Hold.

Operating Considerations

Autoranging Interference After a signal is input, the RF autoranging function (Auto) 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 Hold and set the lower field to an appropriate level for the signal being decoded (start with 40 dB).

Setting the upper field to Hold 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.

Screens on which this field is displayed

RF ANALYZER

SPEC ANL: auxiliary controls menu

Input Gain

This field displays and selects the gain of the AF analyzer’s input amplifier. The choices are 0 dB, 20 dB, or 40 dB. Refer to the Gain Cntl field more information.

Screens on which this field is displayed

AF ANALZYER

200 Chapter 6

C:\Spk\Ref\RefGuideRevE\Anlgscrn.fm