MNL-1029 Rev A
17
External Edge Trigger
The External Edge Trigger mode for the spectrometer looks for a trigger signal on the 16-pin connector. The trigger signal must have
a minimum high time of 10 ns. Once the external pulse rising edge is detected, there is a short delay, t
ETRGDLY,
before the acquisition
cycle begins.
For the case of an Eternal Edge Trigger, T
0
can be defined as the moment the external trigger signal goes from low to high. After the
External Edge Trigger Delay, t
ETRGDLY
, there is the integration delay, followed by the integration period, and finally the busy period,
t
BUSY2
, during which time another trigger cannot be accepted.
The equations for the integration delay are the same as those for Software Triggering Mode.
External Edge Trigger timing parameters are described below.
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