
2-24 Programming Guide
Programming Commands and Examples ESG Family Signal Generators
:FM Subsystem
Frequency Modulation State
:FM[1]|2:STATe ON|OFF|1|0
:FM[1]|2:STATe?
This command toggles the frequency modulation on or off for whichever FM path
configuration (
FM Path 1 or FM Path 2) you have selected. The choices are On (1) or Off (0).
Notice, however that although you can turn on frequency modulation with this command,
the RF carrier is modulated by the enabled modulation only when you have also set
Mod On/Off to On. Whenever frequency modulation is enabled, the FM annunciator is turned
on in the display.
There are two paths for FM modulation which can be simultaneously enabled as long as
they use different sources (Int, Ext1, or Ext2).
FM Path 2 is limited to a maximum rate of
1MHz.
FM Path 2 must be set to a deviation less than or equal to FM Path 1. The modulation
signals from both paths are summed internally for composite modulation.
*RST Value: Off
Internal Frequency Modulation Alternate Frequency
:FM[1]|2:INTernal[1]:FREQuency:ALTernate <val><unit>
:FM[1]|2:INTernal:FREQuency:ALTernate?
This command sets the frequency for the alternate signal. The alternate frequency is the
second frequency of a dual-sine or the stop frequency of a swept-sine. The choices for the
variables <val> and <unit> range from 0.1 kHz (minimum) to 50.0 kHz (maximum).
*RST Value: 400.00 Hz
Internal Frequency Modulation Alternate Frequency Amplitude
:FM[1]|2:INTernal[1]:FREQuency:ALTernate:AMPLitude:PERCent <val><unit>
:FM[1]|2:INTernal:FREQuency:ALTernate:AMPLitude:PERCent?
This command sets the amplitude of the alternate frequency as a percentage of the total
amplitude. Therefore, if the alternate frequency makes up 30% of the total amplitude, then
the primary frequency is 70% of the total amplitude (for dual-sine only). The choices for the
variables <val> and <unit> range from 0.1% (minimum) to 99.9% (maximum).
*RST Value: 50%
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