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Chapter 3 Features and Functions
Amplitude Modulation (AM)
3
• Remote Interface Operation:
[SOURce[1|2]:]AM:INTernal:FREQuency
{<frequency>|MINimum|MAXimum}
Modulation Depth
The modulation depth is expressed as a percentage and represents the
extent of the amplitude variation. At 0% depth, the output amplitude is
constant at one-half of the carrier’s amplitude setting. At 100% depth,
the output amplitude varies according to the modulating waveform, from
0% to 100% of the carrier’s amplitude setting.
• Modulation depth: 0% to 120%. The default is 100%.
• Even at greater than 100% depth, the waveform generator will not
exceed ±5 V peak on the output (into a 50 Ω load). To achieve
modulation depth greater than 100%, output carrier amplitude may
be reduced.
• Front-Panel Operation: After enabling AM, press the AM Depth
softkey. Then use the knob or numeric keypad to enter the depth.
• Remote Interface Operation:
AM:DEPTh {<depth_in_percent>|MINimum|MAXimum}
Double Sideband Suppressed Carrier AM
The 33500 Series supports two forms of amplitude modulation, “Normal”
and Double Sideband Suppressed Carrier (DSSC). To change between
normal AM and DSSC, use the command:
[SOURce[1|2]]:AM:DSSC {ON|OFF}.
In DSSC, the carrier is not present unless the modulating signal has an
amplitude greater than zero.
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