trying to use the TIMER to work out how many mS there are between triggers

Hi all,

First of all, sorry for disturbing.  I tried to use the TIMER to work out how many mS there are between triggers, but I don't think I did it correctly so have a look and could you please guide me. I'm trying to read the TIMER when the trigger occurs and to save the value as "prev time". When the next trigger occurs, I read the TIMER and subtract the "Prev time" to see how long it took.

I set 10 Hz frequency trigger signal. 

I also attached old version LV19 code.

Kind regards

Hasham