i HAVE CONNECTED THE AMP/DISCRMINATOR OUTPUT WHICH GIVES TTL PULSES(RISE TIME 20NS) TO MY PCI6024E COUNTER SOURCE AND CONNECTED THE OTHER COUNTER TO A SQUARE WAVE GENERATOR SO THAT WHEN THAT REACHES A CERTAIN VALUE BOTH THE COUNTERS RESET. i HAVE NO GROUND CONNECTIONS FROM THE BOARD THOUGH. TH GROUND CONNECTIONS INFLUENCE MY RESULT A LOT. ANYBODY WITH SUGGESTIONS.