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Problem with low sampling rate of PXI-6115

Hi,everyone

     I hope using PXI-6115 multifunction DAQ card to measure a pulse height in special way. I use a two channels waveform generator creating two phase correlation pulse waveforms which have same frequency, as showing in attachment. Sending wide pulse to 6115 AI 0 , the narrow pulse is used as AI sampling clock and sending to PFI7. By this way every narrow pulse coming can get an data.
    For high frequency pulse I  indeed can get the wide pulse height, but read data is zero when frequency is less than 1 KHz, is anybody know about this?

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The problem had been solved. It caused by the internal analog FIFO of pipelined ADC(LTC1420) .  

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