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200 Chapter 6
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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