Modulating Waveform Frequency; Modulation Depth - HP 33120A User Manual

Chapter 3 Features and Functions
Amplitude Modulation (AM)

Modulating Waveform Frequency

The function generator will accept an internal modulating signal,
an external modulating signal, or both.
• Modulating frequency (internal source): 10 mHz to 20 kHz.
The default is 100 Hz.
• The sync signal for
AM
carrier). A momentary
zero-crossing point of the modulating signal. The signal is output
from the front-panel SYNC terminal.
• Front-Panel Operation: Press
frequency (the value is displayed for approximately 10 seconds).
Before setting the modulating frequency from the front panel,
you must have enabled. If you attempt to set the frequency when
AM
is not enabled, "
AM SELECT AM, FM
• Remote Interface Operation:
AM:INTernal:FREQuency {<

Modulation Depth

The modulation depth is expressed as a percentage and represents the
extent of the amplitude variation. At 0% modulation, the output amplitude
is half of the selected value. At 100% modulation, the output amplitude
equals the selected value.
• Modulation depth: 0% to 120%. The default is 100%.
• Front-Panel Operation: Press
(the value is displayed for approximately 10 seconds).
Before setting the modulation depth from the front panel, you must
have enabled. If you attempt to set the depth when
AM
enabled, "
SELECT AM, FM
• Remote Interface Operation:
AM:DEPTh {< depth in percent
74
is referenced to the modulating signal (not the
"high" pulse (> 200 ns) is output at each
TTL
to set the modulating
Shift Freq
" is displayed.
>|MINimum|MAXimum}
frequency
to set the depth in percent
Shift Level
" is displayed.
>|MINimum|MAXimum}
is not
AM