Hello Kefei,
If you need to record a series of spectrums, you have a few options. You can used the sweep recording toolbar in Spike (in the sweep measurement mode). You will find the toolbar along the lower part of the Spike application in sweep mode. The file saved is a custom binary file which can either be played back through Spike, or could be parsed programatically. An example C++ parser is in our SDK.
You could also use the SM_API to programatically sweep the SM device and store sweep in whatever format you wish. The SM_API is a C++ DLL for Windows or Linux you can use to control the SM200. You can find this in our SDK. (Software menu on our website).
Regards,
Andrew
