[SOURce[1|2]:]AM:SOURce
[SOURce[1|2]:]AM:SOURce {INTernal|EXTernal|CH1|CH2}
[SOURce[1|2]:]AM:SOURce?
[SOURce[1|2]:]BPSK:SOURce {INTernal|EXTernal}
[SOURce[1|2]:]BPSK:SOURce
[SOURce[1|2]:]FM:SOURce {INTernal|EXTernal|CH1|CH2}
[SOURce[1|2]:]FM:SOURce
[SOURce[1|2]:]FSKey:SOURce {INTernal|EXTernal}
[SOURce[1|2]:]FSKey:SOURce
[SOURce[1|2]:]PM:SOURce {INTernal|EXTernal|CH1|CH2}
[SOURce[1|2]:]PM:SOURce
[SOURce[1|2]:]PWM:SOURce {INTernal|EXTernal|CH1|CH2}
[SOURce[1|2]:]PWM:SOURce?
Select the source of the modulating signal.
Parameter Typical Return
{INTernal|EXTernal|CH1|CH2}, default INTernal. BPSK and FSKey can-
not accept CH1 or CH2
INT, EXT, CH1, or CH2
Select external modulation source:
AM:SOUR EXT (could also substitute FM, BPSK, FSK, PM, or PWM for AM)
Remarks
l If you select EXTernal, the carrier waveform is modulated with an external waveform. Specifically:
l AM:The modulation depth is controlled by the ±5 V signal level on the rear-panel Modulation In connector.
For example, if modulation depth (AM[:DEPTh]) is 100%, then when the modulating signal is at +5 V, the out-
put will be at the maximum amplitude. Similarly, a -5 V modulating signal produces output at minimum ampli-
tude.
l FM:If you select the External modulating source, the deviation is controlled by the ±5 V signal level on the
rear-panel Modulation In connector.For example, if the frequency deviation is 100 kHz, then a +5 V signal
level corresponds to a 100 kHz increase in frequency.Lower external signal levels produce less deviation and
negative signal levels reduce the frequency below the carrier frequency.
l PM:With the External modulating source, deviation is controlled by the ±5 V signal level on the rear-panel
Modulation In connector. For example, if you have set the frequency deviation to 180 degrees, then a +5 V
signal level corresponds to a +180 degree phase deviation. Lower external signal levels produce less deviation,
and negative signal levels produce negative deviation.
Agilent 33500 Series Operating and Service Guide 269
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