41
Function Menu
Settings
Explanations
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/PSK Rate
Set the frequency at which the output phase shifts between the carrier phase and 180°
(internal modulation only): 1 mHz ~ 20 kHz.
Polarity
Positive
Set the modulating polarity.
Negative
Table Menu Explanations of the PSK Parameters
Note:
The methods of setting the parameters of PSK are similar to AM. In addition, the external modulating signal of PSK must be
Square which complies with the CMOS level specification.
5.9.8. PWM
In PWM (
Pulse Width Modulation
), the pulse width of the pulse varies with the instantaneous voltage of the modulating waveform.
The carrier can only be pulse.
Press
[Waveforms] → [Pulse] → [Mod]
the parameters of PWM modulation are shown in Figure 47.
Figure 47: Setting Interface of PWM Modulation
Function Menu
Settings
Explanations
Type
PWM
Pulse width modulation. The carrier is pulse.
Source
Internal
The source is internal
External
The source is external. Use the [Aux In/Out] connector at the rear panel.
Width Dev
Set the width deviation
Sine
Choose the modulating waveform.
Square
Triangle
UpRamp
DnRamp
Noise
Arb
PWM Freq
Set the modulating waveform frequency.
Frequency range: 1 mHz ~ 20 kHz (internal source only).
Table Menu Explanations of the PWM Parameters