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TRIGGERED
RECORDING
A solid state video recorder has unique capabilities that require a
different mind-set from people that are users of traditional forms
of motion analysis. The EKTAPRO EM Motion Analyzer does not
use a recording media such as magnetic tape or photographic
film that runs out after a few seconds of operation. A motion
analyzer with a solid-state memory for image capture can record
forever because of its ability to record over old images. So the
challenge with the EKTAPRO EM Motion Analyzer is to identify
when the images you wish to study are in memory.
The phenomena that are typically the subjects for motion analysis
tend to have a dramatic moment that is either initiated electrically
or can be sensed electrically. Once an electrical signal that is
time related to the event under study is available, using the
EKTAPRO EM Motion Analyzer to capture pictures of the event
becomes routine. The event time related electrical signal, which
we will call the trigger signal from now on, is connected to the
Processor through the TRIGGER IN connector on the rear panel.
The trigger signal must be TTL compatible meaning that the
Processor will read a transition between zero and plus five volts
as a trigger. Most signals used in instrument controlled experi-
ments are TTL compatible. If the event you wish to study does
not happen in response to an electrical signal there is still hope.
6.9
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