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30 Agilent E1441A Application Information
Chapter 2
Modulation depth: 0% to 120%. The default is 100%.
Use the following command to set the modulation depth:
AM:DEPTh <depth in percent>|MINimum|MAXimum
Amplitude Modulating
Source
The function generator will accept an internal modulating signal, an external
modulating signal, or both.
Modulating source: Internal-External (both) or External only. The default
is Both (internal-external).
The External modulating source is always enabled.
When both sources are enabled (internal-external), the function generator
adds the internal and external modulating signals (the carrier waveform is
actually modulated with two waveforms).
When the internal source is disabled (external only), the carrier waveform is
expecting a modulating signal on the AM Modulation terminal.
You apply the external modulating waveform to the AM Modulation
terminal. The modulation depth is controlled by the signal level present
(5 volts
peak corresponds to 100% modulation).
Use the following command to set the modulating source:
AM:SOURce BOTH|EXTernal
Frequency
Modulation (FM)
A modulated waveform consists of a carrier waveform and a modulating
waveform. In
FM, the frequency of the carrier is varied by the amplitude of
the modulating waveform. The function generator will accept only an
internal
FM modulating signal (no external source is available). Topics
covered on frequency modulation are:
• FM Carrier Waveform Shape
Figure 2-2. AM Modulation Input Signal