Re: [time-nuts] Reliability of atomic clocks

On 3/27/16 8:20 PM, Mark Sims wrote: Mil-spec parts would be somewhat more reliable than commercial parts. Actually, that is seldom true. The main difference between mil-spec parts and commercial parts tends to be in the post-packaging device testing (e.g.. extended temperature / voltage

Re: [time-nuts] Reliability of atomic clocks

Am Mon, 28 Mar 2016 03:20:14 + schrieb Mark Sims : > > Mil-spec parts would be somewhat more reliable than commercial > > parts. > Actually, that is seldom true. The main difference between mil-spec > parts and commercial parts tends to be in the post-packaging device

[time-nuts] Reliability of atomic clocks

> Mil-spec parts would be somewhat more reliable than commercial parts. Actually, that is seldom true. The main difference between mil-spec parts and commercial parts tends to be in the post-packaging device testing (e.g.. extended temperature / voltage range). They usually have the same guts

Re: [time-nuts] Reliability of atomic clocks

Titles sound about right. But I don't need them. Someone else was asking. As I say I stumbled across them and since I don't really have a suite of Cesiums never saved it. :-) Thanks Paul WB8TSL On Sun, Mar 27, 2016 at 5:15 PM, Michael Wouters wrote: > Dear Paul, > >

Re: [time-nuts] Reliability of atomic clocks

Hi In the case of the Temex Rb’s in their “reliability sample”, I have hard evidence in front of me that their MTBF numbers were *wildly* optimistic. If their numbers were correct, it would be impossible for me to have as many broken ones in front of me as I do. Bob > On Mar 27, 2016, at 7:11

Re: [time-nuts] Reliability of atomic clocks

Dear Paul, You are probably thinking of one of these: Chadsey et al “Maintenance of HP5071A frequency standards at USNO” in Proc. 29th PTTI, p49-60 (1997) Chadsey “An automated alarm program for HP5071A frequency standards” in Proc. 31st PTTI, p649-655 (1999) Brock et al “End-of-life

Re: [time-nuts] Reliability of atomic clocks

On Sun, 27 Mar 2016 10:50:13 -0400 paul swed wrote: > I do not have it but I stumbled into it on the internet. There was one > paper it was military, naval observatory or NIST and it did indeed show > failure rates of cesiums of the reference that were owned and it must have

Re: [time-nuts] Reliability of atomic clocks

On Sun, 27 Mar 2016 10:13:32 -0400 Bob Camp wrote: > The “typical life” numbers on the tubes in the various Cesium standards > are fairly accurate. Most units that are well cared for “die” when the tube > goes out and come back to life when it’s replaced. The tube life dominates >

Re: [time-nuts] Reliability of atomic clocks

Taking Alan Melia's point that there aren't enough of these devices to establish good statistics and Bob Camp's point that temperature can cause components to fail before the physics package, I'd suggest that there is a need to specify the thermal environment for the 15 year run. How large was the

Re: [time-nuts] Reliability of atomic clocks

My Efratom M-100 has been running for about 15 years 24/7. I have no idea if that is typical. It was purchased as NOS for $300. Rob NC0B Sent from my iPad > On Mar 27, 2016, at 9:11 AM, "Bob Camp" wrote: > > > > Hi > > The “typical life” numbers on the tubes in the various

Re: [time-nuts] Reliability of atomic clocks

it by duplication, the exception may be the space environment but I have no experience there. Good Luck with it Alan G3NYK - Original Message - From: "Attila Kinali" <att...@kinali.ch> To: <time-nuts@febo.com> Sent: Sunday, March 27, 2016 12:53 PM Subject: [time-nuts] Reliab

Re: [time-nuts] Reliability of atomic clocks

Hi The “typical life” numbers on the tubes in the various Cesium standards are fairly accurate. Most units that are well cared for “die” when the tube goes out and come back to life when it’s replaced. The tube life dominates the MTBF in this case. Rb’s are a device that by it’s (possibly

Re: [time-nuts] Reliability of atomic clocks

I do not have it but I stumbled into it on the internet. There was one paper it was military, naval observatory or NIST and it did indeed show failure rates of cesiums of the reference that were owned and it must have been 30-50 of them. I remember it showed failures of units over years. Since it

[time-nuts] Reliability of atomic clocks

Moin, Maybe someone here can help me. I am looking for data on the reliability of atomic clocks. I.e. how often and, if possible, how they fail. Unfortunately, if I google for reliability then all that pops up are descriptions of the accuracy and stability of atomic clocks. If I go for MTBF I