User`s guide

Agilent X-Series Signal Generators User’s Guide 81

Using Analog Modulation (Option UNT)

Configuring the LF Output (Option 303)

The signal generator has a low frequency (LF) output. The LF output’s source can be switched

between an internal modulation source or an internal function generator.

Using internal modulation (Int Monitor) as the LF output source, the LF output provides a replica of

the signal from the internal source that is being used to modulate the RF output. The specific

modulation parameters for this signal are configured through the AM, FM, or ΦM menus. The internal

source (AM, FM, or ΦM) must be configured for the LF Out to provide a signal.

Using function generator as the LF output source, the function generator section of the internal

modulation source drives the LF output directly. Frequency and waveform are configured from the LF

output menu, not through the AM, FM, or ΦM menus. You can select the waveform shape from the

following choices:

Available internal waveforms include:

Sine sine wave with adjustable amplitude and frequency

Triangle triangle wave with adjustable amplitude and frequency

Square square wave with adjustable amplitude and frequency

Pos Ramp positive going ramp with adjustable amplitude and frequency

Neg Ramp negative going ramp with adjustable amplitude and frequency

Pulse pulse with adjustable period and width

LF Out Modulation Sources

The signal generator provides the following modulation input sources. Internal modulation sources

generate the five waveforms listed above unless noted otherwise.

Int Monitor uses AM, FM or ΦM settings.

Func Gen 1 waveforms from the internal function generator

Func Gen 2 waveforms from the internal function generator

Dual Func Gen dual waveforms with individually adjustable frequencies and a percent- of-

peak- amplitude setting for the second tone. Available on instruments with Option

303.

Swept Func Gen swept waveforms with adjustable start and stop frequencies, sweep time, and

sweep trigger settings. Available on instruments with Option 303.

Noise Gen 1 & 2 noise with adjustable amplitude generated as a peak- to- peak value (RMS value is

approximately 80% of the displayed value). Uniform and Gaussian distribution is

available. Available on instruements with Option 303.

DC selects a DC voltage level as the LF output BNC source

NOTE The LF Out Off On softkey controls the operating state of the LF output. However when the LF

output source selection is Int Monitor, you have three ways of controlling the output. You can

use the modulation source (AM, FM, or ΦM) on/off key, the LF output on/off key, or the Mod

On/Off softkey.