User Manual

Modulation Function 47
Function Explanation
Type PSK Phase shift keying modulation.
Source Internal The source is internal.
External The source is external. Use the [Aux In/Out] connector at the rear panel.
Key Freq Set the frequency at which the output phase shifts between the carrier phase and 180°
(internal modulation only): 1mHz~1MHz.
Polarity Positive Set the modulating polarity.
Negative
Figure 9.7 Setting Interface of PSK Modulation
Duty Deviation represents the variation (%) of the modulated waveform duty relative to the original duty. Press Duty
Dev to highlight the parameter, and then use the numeric keyboard or arrow keys and knob to input the desired value,
as shown in the Figure 2-33.
• The duty deviation cannot exceed the current pulse duty cycle.
• The duty deviation is limited by the minimum duty cycle and current edge time setting.
• Duty deviation and width deviation are correlative. Once a parameter is changed, the other will be automatically
changed.
Note: The methods of setting other parameters of PWM are similar to AM.