7-10
Wave Functions (6221 Only)
Model 6220/6221 Reference Manual
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Duration
The duration setting defines how long the waveform is generated. You can set the
duration in time over a range of 100ns to 999999.999s, in cycles from 0.001 to
99999999900 cycles (provided the equivalent time, cycles/frequency does not
exceed the upper time duration limit), or choose a continuous waveform (INFinite
setting). From the front panel, you can only specify a time duration from 0.001s to
999999.999s and a cycle duration as an integer number of cycles between 1 and
99999999900.
If you change from INFinite from the front panel to a numeric setting, the duration
will default to 10 seconds or 10000 cycles as determined by the last selected
duration type (time or cycles).
When a waveform is armed, the execution time is determined based on the explic-
itly programmed time duration or calculated from the specified cycles or duration
settings. The time duration cannot be changed while a waveform is armed. If the
frequency is changed while the waveform is armed, the existing execution time will
remain fixed. The equivalent time duration will not be recalculated even if the
duration is set to cycles. If the same number of cycles is desired at the new fre-
quency, the wave function should be aborted and then re-armed to force the recal-
culation of waveform execution time.
Arbitrary waveforms
A total of five arbitrary waveforms can be defined via remote. One is designated
as volatile and is stored in location 0. Locations 1-4 are stored in flash memory
and saved across power cycles. At power-up, location 0 is empty and cannot be
used until it is populated with waveform data. In order to save arbitrary data
points, you must first store them in location 0 and then copy them to the desired
location 1-4.
Using the external low jitter trigger mode
Model 6221 units with firmware revision A03 or later include a mode to trigger the
arbitrary waveform generator using the instrument’s trigger link lines (see
for detailed information). When this mode is enabled,
the instrument waits for an external trigger pulse on a specified trigger link line
and starts the configured waveform within 1
μ
s of the falling edge of the trigger
To use this mode, you must first enable it using a remote command or from the
front panel. If the front panel approach is taken, the desired trigger link line can
also be set at that time. A separate command is required to select the trigger link
input line over the bus.
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