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Chapter 2 Front Panel Operations
To Select Modulation Source
Tap the Source parameter selection field to select an "Internal" or "External"
modulation source.
1. Internal Source
When the internal source is selected, the modulating waveform is set as a Square
with 50% duty cycle. At this time, the rate at which the output amplitude "shifts"
between "carrier amplitude" and "modulating amplitude" is determined by the
modulation rate.
2. External Source
When the external source is selected, the generator receives the external
modulating signal from the rear-panel [CH1/Sync/Ext Mod/Trig/FSK]
connector.
Note:
The [CH1/Sync/Ext Mod/Trig/FSK] connector controlling ASK
modulation externally is different from controlling AM/FM/PM modulations
externally. While controlling the ASK modulation, you can set the polarity.
To Set Modulating Rate
When the internal source is selected, tap the Mod.Rate parameter input field and
use the numeric keypad to set the rate at which the output amplitude shifts between
"carrier amplitude" and "modulating amplitude".
You can also use the arrow keys and the knob to input a desired frequency
⚫
value.
The frequency range is from 2 mHz to 1 MHz, and the default is 100 Hz.
⚫
Note:
When the external modulation source is selected, this menu will be grayed out
and disabled.
To Set the Modulation Amplitude
Tap the Mod.Ampl parameter input field and use the numeric keypad to set the
modulation amplitude.
You can also use the arrow keys and the knob to input a desired amplitude
⚫
value.
The range of amplitude (HighZ) is from 0 to 10 Vpp, and the default is 2 Vpp.
⚫
DG2000 User Guide
RIGOL
2-45
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