Electronics > Beginners

Replace internal 10MHz crystal with external frequency standard?

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FriedMule:
I have looked around after some article about replacing internal crystal with external frequency standard, but have found nothing.
First I do presume that you can't just unsolder the crystal and solder some coaxial cable in place of that and direct to an external 10MHz frequency standard. :-)

I presume there have to be some sort of circuit?

MosherIV:
Depends on the piece of equipment.
Some equipment allow it by having an external input for alternate clock source.
If not, then you have to understand the circuit around the xtal, it may be easier to tap into the xtal circuit output.

No articles !?! There are several posts around the subject on this forum!

magic:
Most crystal oscillators are inverters with an input and output pin and you can simply feed external clock into the input if you figure out which one it is. Need to take care of voltage levels and amplitude and overload/ESD protection if it's to be robust.

FriedMule:

--- Quote from: MosherIV on October 10, 2019, 06:45:55 am ---Depends on the piece of equipment.
Some equipment allow it by having an external input for alternate clock source.
If not, then you have to understand the circuit around the xtal, it may be easier to tap into the xtal circuit output.

No articles !?! There are several posts around the subject on this forum!

--- End quote ---
One candidate for that modification would be the Rigol MSO5000, I know that Dave talks about the MSO5000 and the MSO7000 circuit board, being wary similar. The MSO700 has, on it's cabinet, an external connector for a 10MHz frequency standard, while the MSO5000 don't have any holes made in the case for that. Great if the MSO5000 already has place to that on the circuit board.

Great to here that there is articles already on this forum, it's just shows that I have used the wrong search terms, what word did you use?


--- Quote from: magic on October 10, 2019, 10:15:55 am ---Most crystal oscillators are inverters with an input and output pin and you can simply feed external clock into the input if you figure out which one it is. Need to take care of voltage levels and amplitude and overload/ESD protection if it's to be robust.

--- End quote ---
Wery interesting and nice to here, then I just have to find out, how to proceed:-)

FriedMule:
I have tried to look at Daves great pictures of both the MSO5000 and 7000 but I can't seem to find out if the MSO5000 do have possibility for external frequency standard, could anyone please take a look and maybe point me in the right direction?

MSO7000:
https://www.flickr.com/photos/eevblog/43924619101/in/album-72157698340312471/
At both images can I see the AUX OUT and the same components right above, near the LAN connectionRigol MSO7000 Oscilloscope Teardown by Dave Jones, on Flickr
MSO5000:
https://www.flickr.com/photos/eevblog/44893167325/in/album-72157701904033821/
And right beside the AUX OUT on this picture, but no space for the EXT IN on this:
Rigol MSO5000 Oscilloscope Teardown by Dave Jones, on Flickr

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