Keysight EXG and MXG X-Series Signal Generators User’s Guide
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Analog Modulation (Option UNT)
Configuring the LF Output (Option 303)
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
Φ
M menus. The
internal source (AM, FM, or
Φ
M) 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
Φ
M 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
Φ
M 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 instruments with Option 303.
