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AM Subsystem

The AM subsystem allows you to add amplitude modulation (AM) to a carrier waveform.

Example

To generate an amplitude modulation (AM) waveform:

1. Configure carrier waveform: Use FUNCtion, FREQuency, VOLTage, and VOLTage:OFFSet to specify the carrier

waveform's function, frequency, amplitude, and offset.

2. Select mode of Amplitude Modulation: AM:DSSC

3. Select modulation source (internal, external, CH1, or CH2): AM:SOURce. For an external source, you can

skip steps 4 and 5 below.

4. Select modulating waveform: AM:INTernal:FUNCtion

5. Set modulating frequency: AM:INTernal:FREQuency

6. Set modulation depth: AM[:DEPTh]

7. Enable AM Modulation:AM:STATe:ON

[SOURce[1|2]:]AM[:DEPTh] {<depth_in_percent>|MINimum|MAXimum}

[SOURce[1|2]:]AM[:DEPTh]? [{MINimum|MAXimum}]

Sets internal modulation depth ("percent modulation") in percent.

Parameter Typical Return

0 to 120, default 100 +5.000000000000000E+01

Set the internal modulation depth to 50%:

AM:DEPT 50

Set the internal modulation depth to 120%:

AM:DEPT MAX

l Even at greater than 100% depth, the instrument 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.

l With AM:SOURce EXTernal, carrier waveform is modulated with an external waveform. 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 output will be at the maximum ampli-

tude. Similarly, a -5 V modulating signal produces output at minimum amplitude.

[SOURce[1|2]:]AM:DSSC {ON|1|OFF|0}

[SOURce[1|2]:]AM:DSSC?

Selects Amplitude Modulation mode − Double Sideband Suppressed Carrier (ON) or AM modulated carrier with side-

bands (OFF).

Agilent 33500 Series Operating and Service Guide 157

Agilent Technologies Agilent 33500 Series User Manual

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