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Old 17 May 2020, 21:28   #5
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Join Date: Aug 2014
Location: Netherlands
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Originally Posted by cdh View Post
As an aside, be aware it is tricky to tune VC190 using an oscilloscope to measure the resultant crystal frequency because your probe is going to add some capacitance to the circuit. If you have a 10x mode, that will help somewhat.
That, and most scopes are not that accurate when it comes to measuring frequency. For the kind of accuracy you need for an RTC clock you really need a dedicated counter. That said, my cheap ass Rigol DS1052E actually has a counter built-in. Dunno how accurate it is though but I used for some relative measurements once and that went quite well.

Last edited by Mathesar; 18 May 2020 at 11:59.
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