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Additive Modulation (Sum)
The "Sum" feature adds the modulating signal to the carrier. For example, you can add controlled amounts of
variable-bandwidth noise to a signal or create two-tone signals. The instrument's internal modulation generator can
produce the same continuous waveform as the main generator, so the Sum function lets you to create many signals
that would have required two instruments before.
The Sum feature increases the amplitude of the output signal by the amplitude of the modulating signal. This might
cause the instrument to switch to a higher output-voltage range, resulting in a momentary signal loss. If this is a
problem in your application, turn on the Range Hold function. If the voltage increase could damage your device
under test, apply Voltage Limits.
Burst
You can configure the instrument to output a waveform with for a specified number of cycles, called a burst. You can
use burst in one of two modes: N-Cycle Burst (also called "triggered burst") or Gated Burst.
An N-Cycle burst consists of a specific number of waveform cycles (1 to 1,000,000) and is always initiated by a
trigger event. You can also set the burst count to "Infinite," which results in a continuous waveform once the
instrument is triggered.
In the image below, the top trace is the sync output, and the bottom one is the main output.
Three-Cycle Burst Waveform
For bursts, the trigger source can be an external signal, an internal timer, the key, or a command from the remote
interface. The input for external trigger signals is the front panel Ext Trig connector. This connector is referenced to
chassis ground (not floating ground). When not used as an input, the Ext Trig connector can be configured as an
output to enable the instrument to trigger other instruments at the same time that its internal trigger occurs.
An N-Cycle burst always begins and ends at the same point in the waveform, called the start phase.
In GATed burst mode, the output waveform is on or off, based on the signal at the front panel Ext Trig connector.
Select this signal's polarity using BURSt:GATE:POLarity. When the gate signal is true, the instrument outputs a
continuous waveform. When the gate signal goes false, the current waveform cycle is completed and the instrument
stops and remains at the voltage level corresponding to the waveform's starting burst phase. For a noise waveform,
the output stops immediately when the gate signal goes false.
Keysight EDU33210 Series User's Guide
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