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Chapter 7 Tutorial
Burst
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4 On the “slave”, select the External trigger source and enable triggering
on the rising edge of the trigger signal.
5 Using an oscilloscope, verify that both instruments are now generating a
three-cycle burst waveform. Then, adjust the trigger delay parameter of
one instrument to bring the two bursts into alignment with each other.
The two instruments are now synchronized and will remain synchronized
until you adjust the trigger delay parameters.
6 Set the starting phase of one instrument to 90°. Then, adjust the burst
count on each instrument as needed for your application. If continuous
burst waveforms are required, select an “Infinite” burst count on both
instruments and enable manual triggering on the “master”.
In this example, the trigger delay parameters become, in effect, system
calibration constants. Once established, they keep the two instruments
aligned in time even if their frequency or starting phase are changed.
Each time the master triggers the slave, the two instruments are re-
synchronized. If the power is cycled, you can realign the instruments by
restoring the previous trigger delays. Note that different delay values
may be required if a different pair of instruments is used or if different
waveform functions are selected.
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.
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