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Chapter 5 133
Analog Measurements - Screens and Control Fields
FM Coupling Freq (marker)
FM Coupling
This field alters the FM modulator to allow DCFM from internal and
external modulation sources. This field also selects ac or dc coupling
between the RF generator’s frequency modulator and the ANALOG
MODULATION IN connector.
Operating Considerations
This field should be set to DC whenever the AFGen2 To field is set to FM;
this provides better modulation response at low data rates.
Screens on which this field is displayed
RF GENERATOR
Freq (marker)
Marker frequency displays the frequency at the marker’s present
position on the spectrum analyzer.
Screens on which this field is displayed
SPEC ANL: all control menus
Figure 5-1 Freq and Lvl Display Fields
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