Hi Joncombat,
If you are using Measurement Studio .NET, there is an example program that installs with Measurement Studio that does Peak Detection and measures the amplitudes of those peaks.
The example programs install in one of two locations:
<Program Files>\National Instruments\MeasurementStudioVS2005\DotNET\Examples\
or
<Documents and Settings>\All Users\Documents\National Instruments\MStudioVS2005\DotNET\Examples\
And the particular example I am referring to is located under <Examples>\Analysis\PeakDetector
Hope this helps!
Jervin Justin
NI TestStand Product Manager