Hello Serafimov,
Do you have a Data Acquisition board or OScope connected via GPIB? If you have a DAQ board, then I would recommend looking at the examples located at \vb\samples\daq to give you a start. Note that you will want to sample at double the frequency of the signal you are measuring (preferably much higher like 250-500 samples/second in this case). If you are using an OScope, then you will need to know how to program it (either by using GPIB commands or an instrument driver). If you use GPIB or VISA, please see the examples located at \vb\samples\instr\.
Jeremiah Cox
Applications Engineer
National Instruments
http://www.ni.com/ask
