Hi The physics package is not really that different than an OCXO. It needs to hit this or that temperature. You derate the parts that go into the “hot zone” in order to hit a “reasonable" MTBF. Indeed, some manufacturers seem to do a better job in this regard than others.
The parts on the rest of the device seem to be pretty standard stuff in the Rb’s I’ve torn open ( = lots of them ). The assumption seems to be that there will be cooling to keep those parts at a reasonable temperature. Since the impact is to MTBF, it’s very much a “only time will tell” if they got it right. Bob > On Nov 24, 2020, at 8:29 AM, 李 <[email protected]> wrote: > > I see, I've always wondered if the internal electronics are specially made > because the modules are really too hot. > Assuming a temperature increase of 10 degrees and the operating life is > reduced by half, the module life should not be long. > > > > 李 > 邮箱[email protected] > > <https://maas.mail.163.com/dashi-web-extend/html/proSignature.html?ftlId=1&name=%E6%9D%8E&uid=bd4kc%40126.com&iconUrl=https%3A%2F%2Fmail-online.nosdn.127.net%2Fwzpmmc%2Ffec2f4b6cb7b6c69a274b3d749ac49a6.jpg&items=%5B%22%E9%82%AE%E7%AE%B1bd4kc%40126.com%22%5D>签名由 > 网易邮箱大师 <https://mail.163.com/dashi/dlpro.html?from=mail88> 定制 > > On 11/23/2020 22:15, Bob kb8tq <mailto:[email protected]> wrote: > Hi > > There are two “zones” in the typical Rb physics package. They both need to be > heated. Unfortunately they need > to be heated to *different* temperatures. This makes for an interesting > design. Insulate things to well and the one > that is supposed to be at a slightly lower temperature is heated up by energy > from the hotter zone. In addition, the > board with all the electronics on it ( or boards) are full of very normal > electronic components. Their failure rate goes > up the hotter they get. > > Heat sinks do indeed help keep all of this in balance. The heaters are > designed to get the physics package to the > appropriate temperature from some very low point ( 0 or maybe -30C). They > have *plenty* of reserve power > capability. In addition, they run at relatively low power (relative to their > ratings) in normal operation. Optimizing > to reduce their failure rate while increasing the failure rate of a few > hundred other parts does not improve the life > of the Rb … > > Bob > > >> On Nov 23, 2020, at 7:33 AM, 李 <[email protected] <mailto:[email protected]>> wrote: >> >> When the Rb clock is working, it needs a high temperature, isn't heat >> dissipation breaking the heat balance?Increased power consumption？ >> >> >> >> >> >> >> 李 >> 邮箱[email protected] >> >> <https://maas.mail.163.com/dashi-web-extend/html/proSignature.html?ftlId=1&name=%E6%9D%8E&uid=bd4kc%40126.com&iconUrl=https%3A%2F%2Fmail-online.nosdn.127.net%2Fwzpmmc%2Ffec2f4b6cb7b6c69a274b3d749ac49a6.jpg&items=%5B%22%E9%82%AE%E7%AE%B1bd4kc%40126.com%22%5D>签名由 >> 网易邮箱大师 <https://mail.163.com/dashi/dlpro.html?from=mail88> 定 >> > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
