crystal oscillator test

dear all

i want to know how to test a crystal oscillator whether it works well or not?
a rough and simple test is better

for example i want to test a 12MHz crystall osc

thanks for advance

regards

One method would be to measure using a frequency counter and a scope.
If you don?t have this devices probably the simplest method to see only if is oscillating is to use a simple diode detector and a meter.

What sort of things are you interested in testing for?

In my travels, I have trouble getting some oscillators to turn on under all conditions. So I would vary the power supply voltage over the expected range, and make sure the oscillator starts up when I turn on the supply. I would vary the oscillator from the coldest to hottest ambient temperature expected and make sure it starts up, and record how far the frequency varies. I would hook some reactive loads (inductors, capacitors, of various +/- JX values, to the output and make sure the oscillator works and stays on the right frequency. I would also hook up any anticipated output filters to the oscillator to make sure it works (like hooking up a lowpass at the output to see if the oscillation stops). For more complex situations (QAM high data rate) I might measure the phase noise under fan vibration.

For 12MHz Crysatl testing, You can test short-term jitter , and long term jitter using scope, In the high quality scope, It can direct measure the jitter. Or you can down the data then using matlab tools do the jitter analysis.

thanks a lot for u all

i want to check the output of an oscillator, whether there's output signal or not. could anyone give a simple circuit tester for oscillator?

sorry for this silly question, im really curious bout it

thanks again