Rigol DG900 Pro Series User Manual page 62

Modulation
In the Carrier (Continuous) interface, click or tap the Ampl/HighL button to set the
parameter to "Ampl". Click or tap its input field and use the pop-up numeric keypad
to set the carrier amplitude. For carrier amplitude setting methods and available
range, please refer to
Modulation Source
The instrument accepts an internal or external signal as the modulation source. Click
or tap the Source drop-down button to select "Internal" or "External".
• Internal Source
When "Internal" is selected, the instrument uses a square wave with 50% duty
cycle as the ASK modulation source. At this time, the output amplitude "shifts"
between "carrier amplitude" and "modulation amplitude". The shift rate is
determined by "ASK Rate".
• External Source
When "External" is selected, the generator receives the external modulating
signal from the rear-panel [AUX IN/OUT] connector.
ASK Rate
ASK rate is the rate at which the output amplitude "shifts" between the carrier
amplitude and modulation amplitude when an internal modulation source is used.
Click or tap the ASK 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 Amplitude
Click or tap the ASK Ampl input field and use the pop-up numeric keypad to set the
modulation amplitude. The available range of modulation amplitude is consistent
with the range of basic waveform amplitude (see
the default is 2 Vpp.
Polarity
Click or tap the Polarity drop-down button to select "Positive" or "Negative" to
control the amplitude output. The default is "Positive".
• Positive: when the internal/external modulation signal is a logic low level, the
carrier amplitude is output; when the signal is a logic high level, the modulation
amplitude is output.
DG900 Pro User Guide
54
Continuous
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Table 5.2 Range of Amplitude
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