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? (1ppb) over the course of a day. ?

It will be the simplest as well. Take the 10MHz output and feed into the Ext Reference input on pretty much all of your lab equipment. Any good counter, signal generator, even bench scopes will have one. A simple video distribution amplifier will serve just fine to ship the signal to all of them at once. Don't forget to put one on the workbench someplace to plug it into whatever you are working on. :)

There are a variety of ways to to check the accuracy of your reference. One of the better ones is to look at jitter and phase difference over time. Feed one into the trigger on a time interval counter such as an HP5370 , the other into the input. The time interval between the two shouldn't change (it will), but the change over time and the jitter between the two will be very instructive. Using this, you can see changes over the course of days or weeks (depending on what data you save). There is a good HP App Note on jitter.

Another is feed one into X, one into Y of an oscilloscope. In phase is a circle. Out of phase is a diagonal line.?

frequency multiples will show pretty patterns from your favorite SciFi movies of the 50's and 60's.

This is a subject many have been drawn into very deeply. There is, in fact an entire mailing list devoted to the subject.

Beware however. It is a subject that can cost you a great deal of time and money. A man with one watch knows what time it is. A man with two is never sure. A man with 3 can make a very good guess however! That thinking can lead to owning several GPSDO's, a rubidium, and a cesium beam standard. Or several of each. Really. And taking your kids up mountains to prove relativity. Really. .

Bob