Counting edges within a period

Hello,

I'm still fairly new to labview and so I could use some help on something I'm working on.

I need to measure two things from an encoder, the RPM, which I can easily do via the index; and the number of edges on the A channel between two index pulses.

I would like to use the index to trigger the counter to begin counting edges on the A channel, and then the next index to end the counting. This program will essentially verify the RPM of the encoder given a base speed, and it will verify the correct resolution of the encoder.

I am using an NI6602 counter card and I need to be able to configure multiple encoders onto it which is why I'm only using the index and channel A.

Thank you,

Jason