Specifications
Programming Guide 2-29
ESG Family Signal Generators Programming Commands and Examples
:FREQuency Subsystem
Frequency Reference
:FREQuency:REFerence <val>
:FREQuency:REFerence?
This command sets the current output frequency as a frequency reference value. The
choices for the variable <val> are frequencies between 0.0 Hz and the signal generator’s
maximum specified output frequency. All frequency parameters are then set as relative to
the reference value.
*RST Value: 0.0 Hz
Frequency Reference State
:FREQuency:REFerence:STATe ON|OFF|1|0
:FREQuency:REFerence:STATe?
This command toggles the frequency reference mode on and off. When frequency reference
mode is turned on, the frequency value displayed is equal to the current hardware output
frequency minus the reference value set by the :FREQuency:REFerence <val> command.
(This command sets the reference value equal to the current output frequency. If you have
not yet set the reference value, the *RST value for frequency reference is 0 Hz.) The REF
indicator is turned on in the frequency area of the display. All frequency parameters will
now be set as relative to the reference value.
Frequency offsets can be used with frequency reference mode. In this situation, the display
will show the frequency calculated as the current hardware output frequency minus the
reference value plus the frequency offset.
Frequency reference mode only changes the display; it does not change the RF output
frequency. For example, if you set your RF output frequency to 700 MHz, set your reference
value to 700 MHz, and then turn frequency relative mode on, your display shows your
frequency as 0 Hz but your output frequency remains at 700 MHz.
*RST Value: Off
Phase Adjustment
:PHASe[:ADJust] <val><unit>
:PHASe[:ADJust]?
This command adjusts the phase of the modulating signal. The choices for the variables
<val> and <unit> may range plus or minus 3.141 radians from the initial value.
*RST Value: 0.000
Reference Oscillator Source Query
:ROSCillator:SOURce?
This command queries the source of the signal generator’s reference oscillator. It returns
either INT or EXT.