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 modulated with the external waveform. The
Ext
annunciator turns on to indicate that the function generator is
expecting a modulating signal on the rear-panel 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).
• Front-Panel Operation:
2: AM SOURCE (MOD MENU)
• Remote Interface Operation:
AM:SOURce {BOTH|EXTernal}
5 V
0 V
-5 V
3
Chapter 3 Features and Functions
Amplitude Modulation (AM)
75
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