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ACQUISITION TRIGGER
The acquisition trigger is a "per curve" (start) or "per point" (sample) trigger
detecting the signal at the TRIG IN connector on the rear panel of the instrument, as
follows:
INTERNAL
The curve buffer acquisition is not affected by input triggers
EXT
PER CURVE
Acquisition starts on detection of a rising edge on the TTL trigger signal. It
continues until the stop trigger condition is satisfied; each data point is taken at
the buffer time per point setting.
EXT
PER POINT
Acquisition starts on detection of a rising edge on the TTL trigger signal, with
each data point requiring a new trigger. It continues until the stop trigger
condition is satisfied; the buffer time per point setting has no effect.
EXT
PER CURVE
Acquisition starts on detection of a falling edge on the TTL trigger signal. It
continues until the stop trigger condition is satisfied; each data point is taken at
the buffer time per point setting.
EXT
PER POINT
Acquisition starts on detection of a falling edge on the TTL trigger signal, with
each data point requiring a new trigger. It continues until the stop trigger
condition is satisfied; the buffer time per point setting has no effect.
STOP TRIGGER
This control sets the condition used to terminate acquisition into the curve buffer, as
follows:
INTERNAL
The curve buffer acquisition continues until stopped manually from the front
panel or via an HC (halt curve) computer command
CURVE BUFFER FULL
The curve buffer acquisition continues until the number of points acquired
equals the curve length setting.
EXT
ON TRIG IN
The curve buffer acquisition continues until detection of a falling edge on the
TTL trigger signal.
EXT
ON TRIG IN
The curve buffer acquisition continues until detection of a rising edge on the
TTL trigger signal.
TRIG OUT MODE
The instrument can generate a TTL compatible trigger output during acquisition to
the curve buffer, which is useful when synchronizing the experiment to the
acquisition. The control has two settings:-
START ONLY
A trigger output is generated once at the start of data acquisition
Chapter 5, FRONT PANEL OPERATION
5-43
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