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RIGOL
© 2006 RIGOL Technologies, Inc
User’s Guide for DG2000 Series
3-14
Example 10: To generate a PWM Waveform
How to generate a PWM waveform with the modulate frequency 150Hz, the offset
25%. And the carried wave is a pulse waveform with the frequency 1 kHz, the offset
25% and the edge time 9ns.
The operation steps:
1.
choose the shape of carried wave
Press Pulse, choose pulse as the carried wave. The default type of source is the
internal.
2.
To set the frequency, amplitude and offset of the carried wave.
(1)
Press Freq/Period to choose Freq which will display in reverse color,
then use the keyboard enter “1” and choose the unit “kHz” to set the
frequency as 1 kHz.
(2)
Press Ampl/Hile to choose Ampl which will display in reverse color,
then use the keyboard enter “5” and choose the unit “V
pp
” to set the
amplitude as 5 V
pp
.
(3)
Press Offset/Lolev to choose Offset which will display in reverse color,
then use the keyboard enter “0” and choose the unit “V
dc
” to set the offset as
0 V
dc
.
When you have set all the parameters, you can observe the carried wave you
have just set in the figure display mode.
3.
Choose PWM as the modulate type
Press Mod in the pulse wave interface and enter the Pulse-Width Modulation.
4.
To set the duty and offset
Press DtyDev and use the keyboard enter “25”, then choose the unit “%” to
set the duty offset as 25%.
5.
To set the frequency of modulation
Press Freq and use the keyboard enter “150”, then choose the unit “Hz” to set the
frequency of the modulation as 150Hz.
6.
Choose the type of the modulation wave
Press Shape
Æ
Sine , choose sine wave as the modulation wave .