HP 81200 User Manual page 35

Timing Principles Introduction to the System
Trigger-Controlled Start
Starting the system via the EXT INPUT has no restrictions. All internal
pipelines are prefilled so that the first Signal comes out after
(±1 system period) + 45 ns + output delay.
Trigger-Controlled Stop
When stopping the system via the EXT INPUT some restrictions apply.
The timing system is stopped immediately, even if the period and delay of a
bit is not complete. The consequence is, that the word at the output might
not be aligned during such a stop. After a restart (in Gated mode) the bits
are realigned again.
When stopping the system ensure that the output word is stable for a
longer time. Use a PAUSE segment for that purpose. The pause should
have a duration of
system period * frequency multiplier * 32 + maximum delay,
where the maximum delay is the maximum delay of all involved channels.
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HP 81200 Data Generator/Analyzer Platform User Guide, Revision 2.1