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Chapter 3 Features and Functions
Pulse Width Modulation (PWM)
3
Modulating Source
The function generator will accept an internal or external modulation
source for PWM.
• Modulating source: Internal or External. The default is Internal.
•
If you select the External source, the pulse waveform is modulated
with an external waveform. The width deviation or duty cycle
deviation is controlled by the ±5V signal level present on the rear-
panel Modulation In connector. For example, if you have set the duty
cycle to 10% and the duty cycle deviation to 5%,
then when the
modulating signal is at +5 volts, the output will be at the
maximum
duty cycle (15%). When the modulating signal is at -5 volts, the output
will be at the
minimum
duty cycle (5%).
•
Front-Panel Operation
: After enabling PWM, press the
Source
softkey.
•
Remote Interface Operation
:
PWM:SOURce {INTernal|EXTernal}
Modulation
In
+5 V
0V
-5 V
33210A users guide.book Page 89 Wednesday, July 16, 2008 11:16 AM
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