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7
Chapter 7 Tutorial
Burst
N-Cycle Burst An N-Cycle burst consists of a specific number of
waveform cycles (1 to 50,000) 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 function generator is triggered.
Three-Cycle Burst Waveform
For bursts, the trigger source can be an external signal, an internal
timer, the
key, or a command received from the remote interface.
The input for external trigger signals is the rear-panel Trig In connector.
This connector accepts TTL-compatible levels and is referenced to chassis
ground (not floating ground). When not used as an input, the Trig In
connector can be configured as an output to enable the 33220A to trigger
other instruments at the same time as its internal trigger occurs.
An N-Cycle burst always begins and ends at the same point in the
waveform, called the start phase. A starting phase of 0° corresponds to
the beginning of the waveform record and 360° corresponds to the end
of the waveform record.
Gated Burst In the Gated burst mode, the output waveform is either
"on" or "off " based on the level of the external signal applied to the rear-
panel Trig In connector. When the gate signal is true, the function
generator outputs a continuous waveform. When the gate signal goes
false, the current waveform cycle is completed and then the function
generator stops while remaining at the voltage level corresponding to the
starting burst phase of the selected waveform. For a noise waveform, the
output stops immediately when the gate signal goes false.
344
Sync Output
Main Output
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