how to check crystal oscillator?

You *ARE* wrong (and don't think, evidently). SI unit names are

*not* capitalized, whether they are derived from a person's name or not. Abbreviations for a unit names that are derived from a person's name *are* capitalized in honor of the person. That's the end of the story.

I gave you one link that backs up my position. Now, admit that you were wrong, for once, then put your slimy tail between your legs run away. My bet is that you will only execute the "then" clause.

This discussion seems to have quit the civilised section, and is, as far as I am concerned, at an end.

Grow up, OM.

That means, in Airy speak, that he has lost the argument, can't stand the fact and is throwing his toys out of the pram.

I guess that's about as much of an admission of error as we can expect.

Look in a mirror, OM. There *is* a reason you have no friends.

...*STOP TOP POSTING*

After following his antics here for a while, I expected nothing less.