Hello,
I would recommend using the "Get Waveform Components" vi (you can search for it from the functions palette on the block diagram). This will allow you to take out just the Y-values (the array of data points) of the waveform and multiply them by ten, without modifying the time values. Then, you can use the "Build Waveform" vi to build the modified waveform back up.
I attached a simple VI that shows the use of these functions. I hope this helps!
Liz Fausak
Applications Engineer
National Instruments