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Chapter 5 135
Analog Measurements - Screens and Control Fields
IF Filter Input Atten
IF Filter
This field selects the desired IF filter bandwidth for modulated signals
being analyzed.
Screens on which this field is displayed
RF ANALYZER
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
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