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Wave Functions (6221 Only)
Model 6220/6221 Reference Manual
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Controlling waveform retriggering behavior
By default, the waveform will restart immediately upon each sequential external
hardware trigger in this mode. If the waveform output has not yet run to comple-
tion, a new hardware trigger will preempt the current waveform and restart the
waveform immediately (see
A). Alternatively, the unit can be configured
to ignore triggers while a waveform is in process. If set this way, the current wave-
form will be output to completion before the unit will accept another trigger (see
B). Whether or not the unit will ignore attempts to retrigger it while run-
ning can be controlled over the front panel or bus.
Setting the inactive value
In the external trigger mode, the output remains enabled while the unit waits for an
external trigger. Before and after triggered waveforms, the inactive value will con-
trol the current output. It can be set to any value between –1.00 and +1.00. The
value is interpreted the same as data values used to specify arbitrary waveform
definitions where -1 represents the maximum negative current flow and +1 repre-
sents the maximum positive current. Any value in between is linearly mapped
between these two extremes to one of 65,536 discrete levels.
Using the wave generator in external low jitter trigger mode
Under normal operation, the waveform generator is armed and then triggered to
begin outputting the waveform immediately. In the external low jitter trigger mode,
the Model 6221 must be similarly armed and triggered. Triggering the unit will turn
on the output, but it will not start the waveform. Once armed and triggered in the
this mode, the unit will wait for an external trigger pulse on the specified trigger
link line before starting the waveform.
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