How do I vary the frequency band on in PicoScope 6 spectrum analyser?
Make sure that you have the latest version (http://www.picotech.com/download.html), and use the zoom tools on the toolbar to zoom in and out on the frequency axis. For example, to zoom in, click the zoom-in tool button (a magnifying glass with a plus sign on the lens). The mouse pointer then becomes a zoom-in tool. Click on the frequency axis where you want the band to start, and drag to the point where you want it to stop, and then release the mouse button. PicoScope will zoom in to show the frequency band you have selected without changing the vertical scaling.