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External Source
After "External" is selected, Shape and PM Freq are grayed out and disabled.
The instrument accepts an external modulation source applied to the rear-panel
[AUX IN/OUT] connector. At this time, the amplitude of the modulated
waveform is controlled by the ±5 V signal level present on the connector.
Modulation Frequency
After the internal modulation source is selected, click or tap the PM Freq input field
and set the modulation frequency with the pop-up numeric keypad. The available
range is from 2 mHz to 1 MHz, and the default is 100 Hz. The resolution is 1 μHz.
TIP
When an external modulation source is selected, this setting is grayed out and disabled.
Phase Deviation
The phase deviation represents the peak variation in phase of the modulated
waveform from the carrier waveform. Click or tap the PM Dev input field to set the
phase deviation. It ranges from 0° to 360°, and the default is 90°. The resolution is
0.01°.
When an external modulation source is selected, the phase deviation is controlled by
the ±5 V signal level on the rear-panel [AUX IN/OUT] connector. For example, if the
phase deviation is set to 180º, the +5 V signal level corresponds to a 180º phase shift.
Lower external signal levels produce less deviation.
6.4
Amplitude Shift Keying (ASK)
With Amplitude Shift Keying (ASK), you can configure the instrument to "shift" its
output amplitude between two preset values (called the "carrier amplitude" and
the"modulation amplitude"). In the "Modulation Setting Interface" (
or tap the "Modulation Type" drop-down button to select "ASK" and set its
parameters.
Carrier Waveform
Available ASK carrier waves include sine (default), square, ramp, and Arb (except DC).
Click or tap the "Wave Type" drop-down button or press the corresponding front-
panel waveform selection key to select the desired carrier waveform shape.
Copyright ©RIGOL TECHNOLOGIES CO., LTD. All rights reserved.
DnRamp with 0% symmetry
Noise - white gaussian noise
Arb - standard arbitrary waveform other than DC. The Arb cannot be
selected as the shape of the carrier waveform and internal modulating
waveform at the same time.
Modulation
Figure 6.1
), click
DG900 Pro User Guide
53
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