212 Chapter 6
Analog Modulation
Configuring the LF Output
Configuring the LF Output
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 (
Internal 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 FM menus.
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 FM menus. You can select the waveform shape from the following choices:
Sine sine wave with adjustable amplitude and frequency
Dual-Sine dual-sine waves with individually adjustable frequencies and a percent-of-
peak-amplitude setting for the second tone (available from function generator only)
Swept-Sine a swept-sine wave with adjustable start and stop frequencies, sweep time, and sweep
trigger settings (available from function generator only)
Triangle triangle wave with adjustable amplitude and frequency
Ramp ramp with adjustable amplitude and frequency
Square square wave with adjustable amplitude and frequency
Noise noise with adjustable amplitude generated as a peak-to-peak value (RMS value is
approximately 80% of the displayed value)
DC direct current with adjustable amplitude
NOTE The LF Out Off On softkey controls the operating state of the LF output. However when the
LF output source selection is
Internal Monitor, you have three ways of controlling the output.
You can use the modulation source (AM, FM, or FM) on/off key, the LF output on/off key,
or the
Mod On/Off softkey.
The RF On/Off hardkey does not apply to the LF OUTPUT connector.
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