How to determine the slew rate of an amplifier using lab view

gud evening all
I have an op amp circuit built on the NI ELVIS board and I input a square wave from function generator to the circuit. I have to determine the slew rate of the op amp.In the labs, one would run the square wave over a range of frequencies and stop when the square wave looks like a triangular wave. At that frequency, one would then measure the slope of the signal and that will give you the slew rate. How can I do that in LabVIEW? How can I check when my square wave starts looking like a triangular wave? please help
good
good

thank you johnsold
i designed a voltage follower using 741, on an Ni elvis instrument. i can manually do the slew rate experiment by varying the frequency range on the coasre frequency knob( using a square wave) of the function generator until the slew rate occurs at 0.5volts, my problem is how can i do the same experiment with built in vi in labview with out touching the knob on the function generator and once the triangular wave starts to show the lab view program will automatically stop.
find attache my vi
good
Attachments:
slew rate.vi ‏21 KB

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