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 rearpanel
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%).