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Wave Functions (6221 Only)
Model 6220/6221 Reference Manual
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19. SOUR:WAVE:EXTR:IGN <b>
‘ Set retrigger behavior
When this command is disabled (OFF), the waveform will restart immediately
upon each sequential external hardware trigger. If the waveform output has
not yet run to completion, a new hardware trigger will preempt the current
waveform and restart the waveform immediately. Alternatively, the unit can be
configured to ignore triggers while a waveform is in process. If set this way
(ON), the current waveform will be output to completion before the unit will
look for another trigger. This setting only applies if the external trigger mode is
enabled.
For example, assume the Model 6221 is configured to output a single cycle of
a sine wave at 1Hz, external triggering is enabled, and external triggers
spaced 500ms apart are input. The first trigger will start the waveform genera-
tor output. If the ignore mode is ON, every other trigger will be ignored since it
occurs while the waveform output is in progress. This will produce a continu-
ous sine wave. If the ignore mode is OFF, every trigger will restart the wave-
form so that only the first 180° of the sine wave is output. This will produce a
continuous full wave positive rectified sine wave.
20. SOUR:WAVE:EXTR:IVAL <NRf>
‘ Set inactive value
When the external trigger mode is on, the output remains enabled while the
unit waits for an external trigger. The inactive value controls the current output
before and after triggered waveforms. 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 represents the maximum positive current. Any value in
between is linearly mapped between these two extremes to one of 65,536 dis-
crete levels.
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