kero06,
Hello friend. I found an example program Making Pulse and Transition Measurements with the NI-4070 with the description:
Using standard LabVIEW waveform functions, the example makes transition measurements such as rise time and slew rate as well as pulse measurements such as period, duty cycle, cycle RMS, and upper and lower amplitude levels.
You can download it here, I hope that helps!
http://www.ni.com/example/29420/en/
Additionally here is a long thread about people discussing their approaches to this question:
https://forums.ni.com/t5/Digital-Multimeters-DMMs-and/Rise-Time-Measurement-with-NI-PXI-4070/td-p/11...
Cheers,
Brandon Castro
Applications Engineer
National Instruments
