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