4 ms·
The coolest part it that it improves both stability and accuracy. Cesium is often touted as a good clock but it only has good accuracy. The short-term stability
by qianyilong 13y ago
The coolest part it that it improves both stability and accuracy. Cesium is often touted as a good clock but it only has good accuracy. The short-term stability has more noise than something like a Rubidium clock that is very stable on the short-term but inaccurate(relative to cesium anyway) on the long term.
This is cool because it is the best in both dimensions.
- madengr 13y agoThe phase noise (really short term stability) of a rubidium oscillator is rather poor compared to on ovenized quartz oscillator. So what I really want is a strontium disciplined OCXO.
- mjb 13y agoYears ago I was involved in some work on clocks that needed very high performance at low cost. We ended up with OCXOs GPS-disciplined over some of their frequency and atomic clock disciplined (cesium, IIRC) over another part of the range. Telling the time is hard.
- madengr 13y agoCool. I bought a couple of HP Z3801A recently for home lab use. Also have an Arbiter GPS disciplined clock at work as a frequency standard for my RF equipment; they use one of the Wenzel OCXOs that has the lowest phase noise you can buy.
- prateekj 13y agoTrue! People use Rubidium clocks only because they are inexpensive. I don't think scientists working in expensive labs rely on Rubidium clocks.
- adamlaiacano 13y agoSome Rubidium clocks require very little power (700mW or less). This makes them ideal for under water applications where short term accuracy isn't an issue because the SONAR data transmission is going to be a mess anyway, and they provide much better long term stability than a crystal oscillator.