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Negative: when the internal/external modulation signal is a logic low level, the
modulation amplitude is output; when the signal is a logic high level, the carrier
amplitude is output.
6.5
Frequency Shift Keying (FSK)
With Frequency Shift Keying (FSK), you can configure the instrument to "shift" its
output frequency between two preset values (called the "carrier frequency" and
the"hop frequency"). In the "Modulation Setting Interface" (
the "Modulation Type" drop-down button to select "FSK" and set its parameters.
Carrier Waveform
Available FSK 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.
In the Carrier (Continuous) interface, click or tap the Freq/Period button to set the
parameter to "Freq". Click or tap its input field and use the pop-up numeric keypad to
set the carrier frequency. The frequency range varies for different carrier waveforms.
For details, 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 FSK modulation source. At this time, the output frequency "shifts"
between "carrier frequency" and "hop frequency". The shift rate is determined by
"FSK Rate".
•
External Source
When "External" is selected, the generator receives the external modulating
signal from the rear-panel [AUX IN/OUT] connector.
FSK Rate
FSK rate is the rate at which the output frequency "shifts" between the carrier
frequency and the hop frequency when an internal modulation source is used. Click
or tap the FSK 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.
TIP
When the external modulation source is selected, this setting is grayed out and disabled.
Copyright ©RIGOL TECHNOLOGIES CO., LTD. All rights reserved.
Continuous
.
Modulation
Figure 6.1
), click or tap
DG900 Pro User Guide
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