How do I keep track of when a signal hits a certain voltage?

I am fairly new to Labview, and I am having trouble with the following. I am working on replacing a Digital Vector Filter with Labview software. I have a rotating shaft with eccentricities, which are measured by X and Y proximitors. Also, a keyphasor voltage keeps track of the rotation rate, which enables me to relate X and Y to each other. Essentially, I have to find when the keyphasor voltage hits -11 volts, and keep track of when that happens, then, keep track of the next time that happens, in order to get the time it takes for one revolution. I don't know if this makes a difference, but the data is coming in as dynamic data. I want to be able to tell the user what the rotational rate is as the program is running.

Thanks for the help!
I have taken the vi you gave me and changed it to a bit. The voltage going in is being sampled rather quickly, and thus there is no actual point that equals -11 Volts. I want to do something like the following: Check timer time, tm, and check:
if tm-1 > -11 Volts and tm < -11
do the following calculation to get the actual value time that voltage crosses -11 Volts, tk.
tk= (tm-1) + ( (tm- (tm-1) ) / ( Km - (Km-1) ) ) * (-11-(Km-1)), where Km is the voltage at tm.
I want to be able to do this streaming, to show the user what the tk value is live. The only times I really need to save are tm and tm-1, from there I can save all the tk's in an array for further analysis.
Please let me know if this is possible.
Thanks
Attachments:
keyphasordata.xls ‏1773 KB
Barebones.vi ‏90 KB

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