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Chapter 6 199
Analog Measurements - Screens and Control Fields
Control Fields for Analog Measurements
Gain Cntl
AF analyzer gain control specifies whether the AF analyzer’s gain
settings are controlled automatically by AF autoranging (Auto), or by
manual control (Hold).
The following settings are affected by AF autoranging:
• Input Gain
•De-Emp Gain
•Notch Gain
Operating Considerations
The normal mode of operation for the Gain Cntl field is Auto, allowing
the instrument to adjust the AF gain settings for optimum
measurement accuracy.
This field can be set to Hold 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 (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
AF ANALYZER
IF Filter
This field selects the desired IF filter bandwidth for modulated signals
being analyzed.
Screens on which this field is displayed
RF ANALYZER