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minimum pulse width needed for gating the counter

Hi,

 

     I have TTL pulses of 20 nanosecond width coming out from the two detectors at random times. I want to count the number of coincidence pulses.I am trying this with NI PCI 6259 M series card, by giving one signal to the gate of the counter and other as a source of the counter (Single Point (On-Demand) Edge Counting with Pause Trigger). When both source and gate are high then it should give the coincidence count.Can anyone suggest  

1) Whether this is possible to gate the counter with 20 nanosecond width pulse?

2) If above thing is possible is this the right way for looking coincidence counts?

 

Any help regarding this is highly appreciated. 

                                                                                                                                                                                                                                         Regards

                                                                                                                                                                                                                                          surya

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