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10 MHz Reference Input/Output on Test Equipment

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regank33

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Why have numerous test equipment all connected to a single precise 10 MHz reference input. What makes this useful.

For example, I have a bench top multi-meter, oscilloscope, function generator with 10 MHz reference input/output.

In what situation would having all of this equipment connected to a single precise 10 MHz reference input provide?

Would the external reference just take over the internal oscillator to provide more accurate time stamps? I understand bit and pieces of this setup, but have never gotten a full picture of this.

Anyone with some knowledge of this area would be great and we can put it all together.

Thanks
 

10MHz is a standard.
Expensive SC cut crystals used in OCXO have stability of 1 in 10^10
Cheap AT cut standard crystals are typ. error of 1 in 10^5
Your watch uses tuning fork chip with 2 in 10^5 error.

Reasons
- Counters need to be accurate.
- RF Generators need low phase noise and accurate F
- General Purpose Signal Generators are ~ 2% accurate
- unless PLL to an internal reference like above 10MHz.
 

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