User Manual

SIGLENT
SSG3000X User Manual 43
2. The square wave modulation frequency range is 0.01Hz~20kHz
2.4.3.5 PM Deviation
The setting range is0.00001rad~N × 5rad. For the definition of N, refer to the data sheet.
 When the modulation source is set to ―Int ―, the set value is actually the frequency
offset of the RF output.
 When the modulation source is set to ―Ext‖, it is related to the amplitude of the
external input modulation signal. Offset of RF output = amplitude of input signal × external
modulation sensitivity.
 When the modulation source selects ―Int+Ext‖, the set value is the maximum value of
the total offset, the internal source accounts for 50%, and the external source accounts for
50%. RF output offset = set value × 0.5 + external input signal amplitude × external
modulation sensitivity.
External modulation sensitivity
The display shows the unit offset quantized by the amplitude of the externally modulated
signal, which is equal to the maximum offset when the external modulation input is full
scale. When the ―Int+Ext‖ modulation source is enabled, the internal and external each
account for 50% of the maximum offset, so when the external source inputs a full scale
signal, it only accounts for 50% of the maximum output offset.
Note: The modulation function must be activated to modulate the output signal. You can
turn it on or off by pressing the MOD ON/OFF button or you can open it by checking the
MOD module on the home page, as shown in the figure: