Hi All, I've finally bought me a scope. Hasn't arrived yet, but I've read the instructions and I'm wondering what can I use for frequency calibration, considering that I don't have a calibrated oscillator. Would 50Hz mains AC be accurate enough for LF calibration? and is there a fairly precise higher frequency waveform that I can use in or from something else?? thanks Jon -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu