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The input to the 5T1A is a trigger signal. The trigger can arrive | The input to the 5T1A is a trigger signal. The trigger can arrive | ||
from any of four sources: | from any of four sources: | ||
* internally from the trigger pick-off in a [[4S1]] plug-in | * internally from the trigger pick-off in a [[4S1]] or [[4S2A]] plug-in | ||
* externally via a [[GR-874 connector]] on the front panel of the 5T1A | * externally via a [[GR-874 connector]] on the front panel of the 5T1A | ||
* from the calibration oscillator in the 661, via the multi-pin plug-in connector | * from the calibration oscillator in the 661, via the multi-pin plug-in connector |
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