191
Chapter 4 Remote Interface Reference
Amplitude Modulation (AM) Commands
4
• If you select an arbitrary waveform as the modulating waveshape
(“USER”), the waveform is automatically limited to 4K points.
Extra waveform points are removed using decimation.
Note:
Arbitrary waveforms are optionally available with the 33210A
(Option 002). To upgrade your 33210A to include arbitrary waveform
functionality, go to
www.
keysight
.com/find/33210U
.
AM:INTernal:FREQuency {<frequency>|MINimum|MAXimum}
AM:INTernal:FREQuency? [MINimum|MAXimum]
Set the frequency of the modulating waveform. Used only when the
Internal modulation source is selected (AM:SOUR INT command).
Select from 2 mHz to 20 kHz. The default is 100 Hz. MIN = 2 mHz.
MAX = 20 kHz. The :FREQ? query returns the internal modulating
frequency in hertz.
AM:DEPTh {<depth in percent>|MINimum|MAXimum}
AM:DEPTh? [MINimum|MAXimum]
Set the internal modulation depth (or “percent modulation”) in percent.
Select from 0% to 120%. The default is 100%. MIN = 0%. MAX = 120%.
The :DEPT? query returns the modulation depth in percent.
• Note that even at greater than 100% depth, the function generator
will not exceed ±5V peak on the output (into a 50Ω load).
•
If you select the
External
modulating source (
AM:SOUR EXT
command
),
the carrier waveform is modulated with an external waveform.
The modulation depth is controlled by the ±5V signal level present
on the rear-panel Modulation In connector. For example, if you have
set the modulation depth to 100% using the AM:DEPT command,
then when the modulating signal is at +5 volts, the output will be at
the maximum amplitude. When the modulating signal is at -5 volts,
then the output will be at the minimum amplitude.
33210A users guide.book Page 191 Wednesday, July 16, 2008 11:16 AM
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