How do I record the position of event pulses between reference pulses?

[andywood]

The reference pulses are distance markers and the event pulses are random fault signals that need to be located distance/time wise with respect to the reference pulses on a continuous basis. The maximum frequency of the reference pulses is 10HZ. I am using Labview on NT4 with 6601 counter and 6023 DAQ.

[bman]

With the 6601, you can use buffered period measurement. This application will count pulses from the internal timebase and every time a rising/falling edge comes in on the gate of the counter, it will get the current count value.

There are examples of this in LabVIEW and using NI-DAQ function calls. Let me know if you have any problems implementing this.

Brian

[andywood]

I have tried to use the buffered period measurement with the counter source set to the internal 100KHZ ref but I have two external pulse sources - the reference pulses that are the regular timing pulses (max 10HZ) and the event pulses which I am trying to measure the position of with respect to the reference pulses. I can't feed both into the gate input without external hardware or can I? The application is a bit like the 'buffered two edge separation measurement' but this only captures one edge on the gate and needs another transition of the aux line to make another measurement whereas I can have none or one or more transitions of the gate (gate) in between each reference pulse (aux line).