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Figure 26. Oscilloscope image of an external enable.
For this external enable “ni” is set to 3.
Because external enable gates the counter directly, it does not rely upon the
detector’s internal clock. This means that the delay between the enable and
start of exposure is negligible and mostly given by the rise time of the enable
provided to the detector. This can be seen in the oscilliscope image below.
Figure 27. Oscilloscope trace of the typical delay between enable signal and exposure.
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