To Next Page

To Previous Page

Amplitude Modulation (AM) and Frequency Modulation (FM)

A modulated waveform consists of a carrier waveform and a modulating waveform. In AM, the carrier amplitude is var-

ied by the voltage level of the modulating waveform. In FM, the carrier frequency is varied by the voltage level of the

modulating waveform. The instrument accepts an internal or external modulation source. On a two-channel instru-

ment, one channel can modulate the other.

Select AM or FM before setting up any other modulation parameter. For more information on modulation, see Mod-

ulation.

To Select AM or FM Modulation

l The instrument allows only one modulation mode to be enabled on a channel. When you enable AM or FM, all other

modulations are off. On two-channel models, the two channels’ modulations are independent from one another,

and the instrument can add modulated waveforms from two channels. See PHASe:SYNChronize and COM-

Bine:FEED for details.

l The instrument will not allow AM or FM to be enabled with sweep or burst. Enabling AM or FM, turns off sweep and

burst.

l To avoid multiple waveform changes, enable modulation after configuring the other modulation parameters.

l Front Panel:

Then turn modulation on:

The waveform is output using the present carrier and modulating waveform settings..

l SCPI:

AM:STATe {OFF|ON}

FM:STATE (OFF|ON)

Agilent 33500 Series Operating and Service Guide 71

Agilent Technologies Agilent 33500 Series User Manual

Questions and Answers: