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PSK Rate
PSK rate is the rate at which the output phase "shifts" between the carrier phase and
modulation phase when an internal modulation source is used. Click or tap the PSK
Rate input field and use the pop-up numeric keypad to set the rate. The available
range is from 2 mHz to 1 MHz, and the default is 100 Hz. The resolution is 1 μHz.
TIP
When the external modulation source is selected, this setting is grayed out and disabled.
Modulation Phase
Click or tap the Phase input field and use the pop-up numeric keypad to set the
modulation phase. It ranges from 0° to 360°, and the default is 180°. The resolution is
0.01°.
Polarity
Click or tap the Polarity drop-down button to select "Positive" or "Negative" to
control the phase output. The default is "Positive".
•
Positive: when the internal/external modulation signal is a logic low level, the
carrier phase is output; when the signal is a logic high level, the modulation
phase is output.
•
Negative: when the internal/external modulation signal is a logic low level, the
modulation phase is output; when the signal is a logic high level, the carrier
phase is output.
6.7
Pulse Width Modulation (PWM)
For Pulse Width Modulation (PWM), the pulse width of the output signal is varied by
the instantaneous voltage of the modulating waveform. The amount by which the
pulse width varies is called the width deviation.
TIP
To select the PWM function, first click or tap the "Wave Type" drop-down button to select
"Pulse" and then set the "Output Mode" to "Mod". The modulation type will be set to "PWM"
automatically. Refer to the following section to set the other modulation parameters.
Carrier Waveform
PWM is only available for the Pulse waveform. Click or tap the "Wave Type" drop-
down button to select "Pulse" or press the front-panel
waveform to Pulse.
For pulse width/duty cycle setting, refer to
Copyright ©RIGOL TECHNOLOGIES CO., LTD. All rights reserved.
key to set the carrier
To Output Pulse
.
Modulation
DG900 Pro User Guide
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