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3
Chapter 3 Features and Functions
Pulse Width Modulation (PWM)
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%).
Modulation
In
• Front-Panel Operation: After enabling PWM, press the Source
softkey.
• Remote Interface Operation:
PWM:SOURce {INTernal|EXTernal}
98
+5 V
0 V
-5 V
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