Hi John: Its not clear if you mean measure the frequency of an oscillator or of a crystal? If it's an oscillator you just need a frequency counter that is more accurate than the oscillator you want to measure. If it's a crystal then it's much more complicated because most common crystals are designed to operate with a specified load capacitance (typically in the area of 20 to 32 pF). Since stray wiring or PCB trace capacitance can move this value 10% you can not just plug the crystal into some circuit and measure the resulting oscillation frequency. You either need a test oscillator with a known load capacitance or use test instruments specifically designed to measure the crystal parameters. If you want precision into the area less then maybe 500 Hz for either of the above you also need a temperature controlled environment. Have Fun, Brooke Clarke, N6GCE http://www.precisionclock.com > Date: Fri, 29 Nov 2002 09:15:25 +0800 > From: john chung > Subject: How to test crystak(oscillator) > > Hi there, > > Does anyone knows how to measure the frequency of a crystal. What kind of test equipment must I use(multimeter)? > > Thanks > John Chung -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics