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[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 173

Agilent Technologies Agilent 33500 Series User Manual

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