RIGOL
DG1000Z Quick Guide 21
To Output AM Modulated Waveform
For amplitude modulation (AM), the amplitude of the carrier waveform varies with
the instantaneous voltage of the modulating waveform. This section introduces how
to output AM modulated waveform from the [CH1] connector (the carrier is sine
with 5kHz frequency and 5Vpp amplitude, the modulating waveform is sine with
200Hz frequency and the modulation depth is 80%).
1. To select output channel
Press CH1|CH2 to select CH1. Now the boarder of the channel status bar is
displayed in yellow.
2. To set the carrier waveform shape, frequency and amplitude
1) Carrier Waveform Shape: press Sine to select sine as the carrier waveform.
2) Carrier Frequency: press Freq/Period to highlight “Freq”. At this point, use
the numeric keyboard to input 5. Then, select kHz from the pop-up menu.
3) Carrier Amplitude: press Ampl/HiLevel to highlight “Ampl”, and then use
the numeric keyboard to input 5. Then, select Vpp from the pop-up menu.
3. To select AM modulation
Press Mod Type AM to enable AM function.
When Mod is enabled, Sweep or Burst will be disabled automatically (if
enabled currently).
Int and AM will be displayed in the bottom of the screen.
4. To set Modulating waveform frequency
Press AM Freq, and then use the numeric keyboard to input 200. Then, select
Hz from the pop-up menu.
5. To select modulating waveform
Press Shape to select Sine from the pop-up menu.
6. To set modulation depth
Press AM Depth, and then use the numeric keyboard to input 80. Then,
select % from the pop-up menu.
7. To enable the output
Press Output1 to turn CH1 output on. At this point, the backlight goes on and
the [CH1] connector outputs the AM modulated waveform based on the current
settings.
8. To observe the output waveform
Connect the [CH1] connector to the oscilloscope using BNC cable. The
waveform is as shown in the figure below.
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