As an aside, some materials can change their magnetic properties after cold working/forming like stainless steel for example.
On Tue, Jan 17, 2017 at 10:17 AM, Bob Camp <[email protected]> wrote: > Hi > > At least at the “it stops working” level, Rb’s are not as sensitive to > residual magnetic fields as what you > describe on H-masers. The scrap guys routinely mangle the shielding around > small Rb’s and the parts > still work when we receive them. > > On another level, the answer is (of course) yes. Any residual field will > have an effect on a magnetically tuned > frequency source. That would definitely drive the material selection for > anything in or near the physics package. > > Bob > > > On Jan 17, 2017, at 9:53 AM, John Ponsonby <[email protected]> > wrote: > > > > Re: Low Cost Temperature sensor > > The ZNI1000 sensor is based on nickel. As such it must be ferromagnetic. > It would thus be absolutely unacceptable in an H-maser where every single > small item inside the magnetic shields must be tested for residual > ferromagnetism. If ferromagnetism is detectable the item is unacceptable. > This applies to every small screw, thermistor, varactor etc. Unfortunately > manufacturers of thermistors etc don't state what the wires are made of and > it may vary between batches of the same nominal item. This is one of the > problems with making H-masers. Though nominally made of copper and zinc, > common brass often shows residual ferro magnetism because it is "recovered" > metal and is contaminated with iron. That brass must never be used in a > magnetic instrument have been known for a very long time. I don't know > off-hand if Caesium or Rubidium standards are as sensitive in this regard > as H-masers. I guess I could find out from Vanier and Audoin. > > John P > > > > > > On 17 Jan 2017, at 14:14, [email protected] wrote: > > > >> Send time-nuts mailing list submissions to > >> [email protected] > >> > >> To subscribe or unsubscribe via the World Wide Web, visit > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> or, via email, send a message with subject or body 'help' to > >> [email protected] > >> > >> You can reach the person managing the list at > >> [email protected] > >> > >> When replying, please edit your Subject line so it is more specific > >> than "Re: Contents of time-nuts digest..." > >> > >> > >> Today's Topics: > >> > >> 1. Re: Looking for GPS module (Exactime ET6000/Datum 9390-6000) > >> ([email protected]) > >> 2. Re: wifi with time sync (David) > >> 3. Re: wifi with time sync (David) > >> 4. Looking for GPS module (Exactime ET6000/Datum 9390-6000 > >> (Mark Sims) > >> 5. HP 5061A/B Cesium tube conundrum ([email protected]) > >> 6. Re: HP 5061A/B Cesium tube conundrum (paul swed) > >> 7. Fluke/Pendulum Counters - Rubidium Timebase (Ed Palmer) > >> 8. Re: Fluke/Pendulum Counters - Rubidium Timebase (Magnus Danielson) > >> 9. Looking for GPS module (Exactime ET6000/Datum 9390-6000) > >> (Mark Sims) > >> 10. How to create a super Rb standard (Perry Sandeen) > >> 11. Low CostTemperature sensor (Perry Sandeen) > >> 12. Who has a hm H Maser? (Perry Sandeen) > >> 13. Who has a hm H Maser? (Perry Sandeen) > >> 14. TICC update? (Scott Newell) > >> 15. Re: Low CostTemperature sensor (Bill Hawkins) > >> 16. Re: Looking for GPS module (Exactime ET6000/Datum 9390-6000) > >> ([email protected]) > >> 17. Re: Low CostTemperature sensor (Jason Ball) > >> 18. Re: Low CostTemperature sensor (Tom Miller) > >> 19. Re: Low CostTemperature sensor (Charles Steinmetz) > >> 20. Re: How to create a super Rb standard (Bob Camp) > >> 21. Re: Low CostTemperature sensor (Scott Stobbe) > >> 22. Re: TICC update? (John Ackermann N8UR) > >> > >> > >> ---------------------------------------------------------------------- > >> > >> Message: 1 > >> Date: Mon, 16 Jan 2017 13:17:32 -0500 > >> From: [email protected] > >> To: Discussion of precise time and frequency measurement > >> <[email protected]> > >> Subject: Re: [time-nuts] Looking for GPS module (Exactime ET6000/Datum > >> 9390-6000) > >> Message-ID: <[email protected]> > >> Content-Type: text/plain; charset=utf-8 > >> > >> I did see that one, but I am hoping I can procure something that isn't > >> from an overseas surplus scrapper. If I can't find anything else, then I > >> guess it's my only choice. Unfortunately, the Heol folks don't have > >> anything to offer here either. It's not a WNRO problem, as the week and > >> date are correct. Even if not, that doesn't affect the GPSDO, only the > >> timecode generation. > >> > >> Thanks for replying and the eBay pointer. > >> > >> On 01/16/2017 02:56 AM, Mike Cook wrote: > >>> If your friends don’t have a CM3 spare, there is one on eBay item > 141712522709. It might be worth pulling the GPS part and testing it stand > alone as there have been numerous week number roll over problems surfacing. > If that is the case for yours then a replacement gets you nowhere. > >>> > >>>> Le 16 janv. 2017 à 07:32, [email protected] a écrit : > >>>> > >>>> I’ve had an intermittent problem with my ET6000/9390-6000 GPSDO where > the reported error (the FRQ: display on the LCD) initially is OK (low > E-12’s) and then creeps up to the limit (~500), and the tracking and locked > LEDs go out. I’ve spent some time troubleshooting this and it seems > confirmed that the GPS module has finally gone south. I’m asking if anyone > has a similar module tucked away somewhere. > >>>> > >>>> The module is basically a Trimble SveeSix-CM3 and is based on the > 25040 board. It’s labeled 26889-81 so is a variant of the standard TSIP > part. Can anyone help with a replacement? Exact replacement would be ideal > of course, but even a standard CM3 would be useful - I’ve done other > ‘conversions’ before. > >>>> > >>>> Thanks > >>>> > >>>> Paul > >>>> _______________________________________________ > >>>> time-nuts mailing list -- [email protected] > >>>> To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > >>>> and follow the instructions there. > >>> "The power of accurate observation is commonly called cynicism by > those who have not got it. » > >>> George Bernard Shaw > >>> > >>> _______________________________________________ > >>> time-nuts mailing list -- [email protected] > >>> To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > >>> and follow the instructions there. > >> > >> > >> > >> > >> ------------------------------ > >> > >> Message: 2 > >> Date: Mon, 16 Jan 2017 14:12:58 -0600 > >> From: David <[email protected]> > >> To: Discussion of precise time and frequency measurement > >> <[email protected]> > >> Subject: Re: [time-nuts] wifi with time sync > >> Message-ID: <[email protected]> > >> Content-Type: text/plain; charset=ISO-8859-1 > >> > >> Modern systems are very aggressive about DVFS (dynamic voltage and > >> frequency scaling) so it would not surprise me at all. I have run > >> across this problem on the timescale of one second even on 10 year old > >> desktop hardware. > >> > >> On Sun, 15 Jan 2017 09:32:56 -0500, you wrote: > >> > >>> Hi > >>> > >>> I’d be surprised if a laptop running on wall power and doing a variety > of low level > >>> traffic every second is throttling the chip set. It *is* doing > something weird and > >>> that certainly is one candidate. I’m not quite as concerned with the > *why* the bumps > >>> occur (though I am curious). I’m more interested in the fact that they > are really > >>> enormous (compared to other delays). How they do microsecond timing > with them > >>> in the mix is the big question. > >>> > >>> Bob > >> > >> > >> ------------------------------ > >> > >> Message: 3 > >> Date: Mon, 16 Jan 2017 14:22:15 -0600 > >> From: David <[email protected]> > >> To: Discussion of precise time and frequency measurement > >> <[email protected]> > >> Subject: Re: [time-nuts] wifi with time sync > >> Message-ID: <[email protected]> > >> Content-Type: text/plain; charset=ISO-8859-1 > >> > >> Sonos and I guess their competitors do this by dropping WiFi > >> compatibility. They exist on their own network in the same ISM band > >> so I wonder how well they coexist with WiFi. Online reports say > >> poorly under crowded band conditions. > >> > >> On Sun, 15 Jan 2017 09:50:05 -0500, you wrote: > >> > >>> Hi > >>> > >>> The push behind this is whole house audio. These guys want to be able > to set up WiFi > >>> speakers / mic's all through a home and get proper audio imaging in > each room. They likely > >>> also want to use it to figure out which mic you are talking to using > time of arrival. They very > >>> much want to do this in real environments (300 WiFi nets in the > building). Since they want to > >>> roll it out that way, it’s got to be cheap and fairly robust. They > need their gizmo to work with > >>> the infrastructure you already have. > >>> > >>> Bob > >> > >> > >> ------------------------------ > >> > >> Message: 4 > >> Date: Mon, 16 Jan 2017 20:39:33 +0000 > >> From: Mark Sims <[email protected]> > >> To: "[email protected]" <[email protected]> > >> Subject: [time-nuts] Looking for GPS module (Exactime ET6000/Datum > >> 9390-6000 > >> Message-ID: > >> <MWHPR1701MB1791AED591CD66611833A936CE7D0@MWHPR1701MB1791. > namprd17.prod.outlook.com> > >> > >> Content-Type: text/plain; charset="iso-8859-1" > >> > >> I recently added code to Lady Heather to support up to 10 external com > links (serial or TCPI/IP). One is the receiver port, one will be a TICC, > and two are "echo" ports. One echo port echoes all the raw data sent by > the receiver and the other does the same thing except the data is formatted > as standard NMEA sentences. > >> > >> One could add the ability to echo out the messages that an SV6 sends > and then any GPS receiver that works with Heather could emulate an SV6. > You might have to add code to send the proper messages out only when the > Datum requests them. That depends upon how the Datum firmware works. > >> > >> ------------------------------ > >> > >> Message: 5 > >> Date: Mon, 16 Jan 2017 12:58:09 -0800 > >> From: <[email protected]> > >> To: [email protected] > >> Subject: [time-nuts] HP 5061A/B Cesium tube conundrum > >> Message-ID: <[email protected]> > >> Content-Type: text/plain; charset=us-ascii > >> > >> I've been doing some work on testing some HP 5061A/B tubes > >> and came across something that's not making any sense! > >> The R11 and R12 values marked on the tubes for use with the > >> new style A11 are supposed to reflect a parallel value > >> that is 10X larger than the thermistor reading. > >> This to agree with the ratio of the bridge resistors in the > >> A11 module. > >> For instance a 3112A prefix tube shows values of 3.83K > >> and 42.2K. This gives a parallel value of 3.511K which when > >> divided by 10 gives 351.1 Ohm. The value marked on the tube > >> was 352 Ohm. That all makes sense! > >> Now I have three 3232A prefix tubes and they all do not > >> reflect this ratio. > >> For instance one has values of 51.1K and 5.11K which gives > >> 4.65K. This divided by ten gives 465 Ohms. However the > >> Thermistor value marked on the tube is 915 Ohms! > >> I tested all three tubes and they come up to the proper > >> temperature with the thermistor value marked on the tube. > >> Did HP make a change to the A11 bridge resistor ratio, and > >> if so where did they document it! > >> If not and you used the R11 and R12 values you would > >> seriously overheat the tube! > >> > >> Cheers, > >> > >> Corby > >> > >> > >> > >> ------------------------------ > >> > >> Message: 6 > >> Date: Mon, 16 Jan 2017 17:07:19 -0500 > >> From: paul swed <[email protected]> > >> To: Discussion of precise time and frequency measurement > >> <[email protected]> > >> Subject: Re: [time-nuts] HP 5061A/B Cesium tube conundrum > >> Message-ID: > >> <CAD2JfAh8Vq5crZfqoYrOiWHruj9CbCX9KOGN8tep_4hSm86e1Q@mail. > gmail.com> > >> Content-Type: text/plain; charset=UTF-8 > >> > >> Corby thats a heck of a puzzle. I am trying to think about how you could > >> prove it. I have some thoughts that are not at all well formed. It comes > >> from my experiments on Frankenstein temp control. > >> > >> If you could please tell me what you might expect the alternate bridge > >> resistors to be overall I will look through my various bits to see if > there > >> is anything. > >> > >> Regards > >> Paul > >> WB8TSL > >> > >> On Mon, Jan 16, 2017 at 3:58 PM, <[email protected]> wrote: > >> > >>> I've been doing some work on testing some HP 5061A/B tubes > >>> and came across something that's not making any sense! > >>> The R11 and R12 values marked on the tubes for use with the > >>> new style A11 are supposed to reflect a parallel value > >>> that is 10X larger than the thermistor reading. > >>> This to agree with the ratio of the bridge resistors in the > >>> A11 module. > >>> For instance a 3112A prefix tube shows values of 3.83K > >>> and 42.2K. This gives a parallel value of 3.511K which when > >>> divided by 10 gives 351.1 Ohm. The value marked on the tube > >>> was 352 Ohm. That all makes sense! > >>> Now I have three 3232A prefix tubes and they all do not > >>> reflect this ratio. > >>> For instance one has values of 51.1K and 5.11K which gives > >>> 4.65K. This divided by ten gives 465 Ohms. However the > >>> Thermistor value marked on the tube is 915 Ohms! > >>> I tested all three tubes and they come up to the proper > >>> temperature with the thermistor value marked on the tube. > >>> Did HP make a change to the A11 bridge resistor ratio, and > >>> if so where did they document it! > >>> If not and you used the R11 and R12 values you would > >>> seriously overheat the tube! > >>> > >>> Cheers, > >>> > >>> Corby > >>> > >>> _______________________________________________ > >>> time-nuts mailing list -- [email protected] > >>> To unsubscribe, go to https://www.febo.com/cgi-bin/ > >>> mailman/listinfo/time-nuts > >>> and follow the instructions there. > >>> > >> > >> > >> ------------------------------ > >> > >> Message: 7 > >> Date: Mon, 16 Jan 2017 16:01:02 -0600 > >> From: Ed Palmer <[email protected]> > >> To: Discussion of precise time and frequency measurement > >> <[email protected]> > >> Subject: [time-nuts] Fluke/Pendulum Counters - Rubidium Timebase > >> Message-ID: <[email protected]> > >> Content-Type: text/plain; charset=utf-8; format=flowed > >> > >> I have a Fluke PM6681 counter that just has the basic oscillator. I was > >> thinking of upgrading it to the Rubidium timebase. From the service > >> manual, it appears to use an LPRO, but there's nothing obvious regarding > >> heat sinking. Does anyone have pictures of this installation or, at > >> least, seen it? Is there any heat sinking at all? > >> > >> I realize the firmware won't report it as a PM6681R and there will be a > >> few non-standard work-arounds required, as well as an auxiliary power > >> supply (the original needs this as well), but I don't see any > >> showstoppers here. Does anyone have any warnings or advice? > >> > >> Thanks, > >> Ed > >> > >> > >> > >> ------------------------------ > >> > >> Message: 8 > >> Date: Mon, 16 Jan 2017 23:42:31 +0100 > >> From: Magnus Danielson <[email protected]> > >> To: [email protected] > >> Cc: [email protected] > >> Subject: Re: [time-nuts] Fluke/Pendulum Counters - Rubidium Timebase > >> Message-ID: <[email protected]> > >> Content-Type: text/plain; charset=utf-8; format=flowed > >> > >> Ed, > >> > >> On 01/16/2017 11:01 PM, Ed Palmer wrote: > >>> I have a Fluke PM6681 counter that just has the basic oscillator. I > was > >>> thinking of upgrading it to the Rubidium timebase. From the service > >>> manual, it appears to use an LPRO, but there's nothing obvious > regarding > >>> heat sinking. Does anyone have pictures of this installation or, at > >>> least, seen it? Is there any heat sinking at all? > >>> > >>> I realize the firmware won't report it as a PM6681R and there will be a > >>> few non-standard work-arounds required, as well as an auxiliary power > >>> supply (the original needs this as well), but I don't see any > >>> showstoppers here. Does anyone have any warnings or advice? > >> > >> Asked the former Fluke/Pendulum service engineer Stefan Ledberg, and > >> here is his comments: > >> > >> The built in Rubidium can use basically any source and have on earlier > >> models used a Datum or Efratom LPRO-101 model (no heatsink), and later > >> models used Spectratime LPFRS-01 special Heatsink and adapter from DSUB > >> to LPRO-equivalent. PSU is added internally that is sharing PCB with the > >> output amplifier for the additional 10Mhz output on the rear panel. The > >> PSU and output is no longer in production and I doubt there are any left > >> at the factory... I can make an inqury if really important, Internally > >> 10Mhz is connected to a 2 pin header and Source is selected with a > >> jumper. however as stated firmware will still claim std or ocxo > >> timebase. However my recommendation is to power a Rubidium timebase > >> externally with off the shelf PSU and just feed the PM6681 on "Ext Ref > >> in" this will accept most levels of Signal and no fuss needed. > >> > >> Cheers, > >> Magnus > >> > >> > >> ------------------------------ > >> > >> Message: 9 > >> Date: Tue, 17 Jan 2017 00:42:42 +0000 > >> From: Mark Sims <[email protected]> > >> To: "[email protected]" <[email protected]> > >> Subject: [time-nuts] Looking for GPS module (Exactime ET6000/Datum > >> 9390-6000) > >> Message-ID: > >> <MWHPR1701MB1791594F3990F671DBC20922CE7C0@MWHPR1701MB1791. > namprd17.prod.outlook.com> > >> > >> Content-Type: text/plain; charset="Windows-1252" > >> > >> On the chip with the "MX" marking on it, what f/w version does it show > (usually v5.02 or v5.10)? I have a couple of CM3's configured for TAIP > output, but I have the programs for switching them to TSIP or NMEA. > >> > >> ----------------------- > >> > >>> The module is basically a Trimble SveeSix-CM3 and is based on the > 25040 board. It’s labeled 26889-81 so is a variant of the standard TSIP > part. Can anyone help with a replacement? Exact replacement would be ideal > of course, but even a standard CM3 would be useful - I’ve done other > ‘conversions’ before. > >> > >> > >> ------------------------------ > >> > >> Message: 10 > >> Date: Tue, 17 Jan 2017 03:24:32 +0000 (UTC) > >> From: Perry Sandeen <[email protected]> > >> To: "[email protected]" <[email protected]> > >> Subject: [time-nuts] How to create a super Rb standard > >> Message-ID: <[email protected]> > >> Content-Type: text/plain; charset=UTF-8 > >> > >> > >> List > >> It looks like their is as infinitely small chance of being able to get > 5065. > >> So what can be done with the telco Rb's (mine are analog tuned) to > wring the best possible performance from them? Sooper Duper power supplies, > Peltier (sp) cooling modules? > >> Regards, > >> Perrier > >> > >> ------------------------------ > >> > >> Message: 11 > >> Date: Tue, 17 Jan 2017 03:33:14 +0000 (UTC) > >> From: Perry Sandeen <[email protected]> > >> To: "[email protected]" <[email protected]> > >> Subject: [time-nuts] Low CostTemperature sensor > >> Message-ID: <[email protected]> > >> Content-Type: text/plain; charset=UTF-8 > >> > >> List, > >> A while back there was much discussion about temperature sensors. > >> One simple inexpensive one to consider would be the ZNI1000Temperature > sensor. > >> It's 1K ohms at 0C and it replicates the temperature curve of the Pt 1K > ohm sensors. > >> It's about $3 from Digi-Key. > >> FWIW YMMY > >> Regards, > >> Perrier > >> > >> ------------------------------ > >> > >> Message: 12 > >> Date: Tue, 17 Jan 2017 03:16:06 +0000 (UTC) > >> From: Perry Sandeen <[email protected]> > >> To: "[email protected]" <[email protected]> > >> Subject: [time-nuts] Who has a hm H Maser? > >> Message-ID: <[email protected]> > >> Content-Type: text/plain; charset=UTF-8 > >> > >> List, > >> The discussion about building a H Maser has been fascinating however it > appears that there will be a long time period before the project reaches > fruition. > >> My questions for those that have a H Maser are: > >> > >> Where and when did you get it and what was the cost? > >> > >> Exactly what do you have to do to keep it operating? > >> > >> Lastly where would one look to get a GOOD used H Maser and what would > it cost (rough guess is fine)? > >> Regards, > >> Perrier > >> > >> ------------------------------ > >> > >> Message: 13 > >> Date: Tue, 17 Jan 2017 03:16:06 +0000 (UTC) > >> From: Perry Sandeen <[email protected]> > >> To: "[email protected]" <[email protected]> > >> Subject: [time-nuts] Who has a hm H Maser? > >> Message-ID: <[email protected]> > >> Content-Type: text/plain; charset=UTF-8 > >> > >> List, > >> The discussion about building a H Maser has been fascinating however it > appears that there will be a long time period before the project reaches > fruition. > >> My questions for those that have a H Maser are: > >> > >> Where and when did you get it and what was the cost? > >> > >> Exactly what do you have to do to keep it operating? > >> > >> Lastly where would one look to get a GOOD used H Maser and what would > it cost (rough guess is fine)? > >> Regards, > >> Perrier > >> > >> ------------------------------ > >> > >> Message: 14 > >> Date: Mon, 16 Jan 2017 22:07:57 -0600 > >> From: Scott Newell <[email protected]> > >> To: [email protected] > >> Subject: [time-nuts] TICC update? > >> Message-ID: <[email protected]> > >> Content-Type: text/plain; charset="us-ascii"; format=flowed > >> > >> I see that my credit card has been charged. Is that a hint that the > >> TICC project is moving along? Should I start gathering up cables and > >> SMA adapters? > >> > >> -- > >> newell N5TNL > >> > >> > >> > >> ------------------------------ > >> > >> Message: 15 > >> Date: Mon, 16 Jan 2017 23:16:29 -0600 > >> From: "Bill Hawkins" <[email protected]> > >> To: "'Perry Sandeen'" <[email protected]>, "'Discussion of precise > >> time and frequency measurement'" <[email protected]> > >> Subject: Re: [time-nuts] Low CostTemperature sensor > >> Message-ID: <3062507E35F44012ADCBDA86FA7CA47E@system072> > >> Content-Type: text/plain; charset="us-ascii" > >> > >> Perrier, > >> > >> Google finds a Siemens NI1000 sensor that follows the nickel curve. > >> Nickel is popular in industrial control for cost, but not as accurate as > >> platinum. Converting the platinum curve to accurate temperatures > >> requires a second order equation, but has been done with 0.1% analog > >> converters. > >> > >> Digi-key has ZNI devices as surface mount parts. Sparse data said > >> nothing about a platinum curve. > >> > >> I'm curious because my former employer did very well selling platinum > >> RTD sensors, usually 100 ohms at the triple point. > >> > >> Bill Hawkins > >> > >> > >> -----Original Message----- > >> From: time-nuts [mailto:[email protected]] On Behalf Of Perry > >> Sandeen via time-nuts > >> Sent: Monday, January 16, 2017 9:33 PM > >> To: [email protected] > >> Subject: [time-nuts] Low CostTemperature sensor > >> > >> List, > >> A while back there was much discussion about temperature sensors. > >> One simple inexpensive one to consider would be the ZNI1000Temperature > >> sensor. > >> It's 1K ohms at 0C and it replicates the temperature curve of the Pt 1K > >> ohm sensors. > >> It's about $3 from Digi-Key. > >> FWIW YMMY > >> Regards, > >> Perrier > >> _______________________________________________ > >> time-nuts mailing list -- [email protected] To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> and follow the instructions there. > >> > >> > >> > >> ------------------------------ > >> > >> Message: 16 > >> Date: Tue, 17 Jan 2017 00:23:35 -0500 > >> From: [email protected] > >> To: Discussion of precise time and frequency measurement > >> <[email protected]> > >> Subject: Re: [time-nuts] Looking for GPS module (Exactime ET6000/Datum > >> 9390-6000) > >> Message-ID: <[email protected]> > >> Content-Type: text/plain; charset=utf-8 > >> > >> Due to the stickers, I don’t see anything with MX on it, but I presume > you mean the ROM. It has 28655-01 and V5.00 on it. The other model number > is 26889-81, the -x1 kind of implies that it’s TSIP, and from sniffing the > GPS traffic in a prior exercise, I can confirm that it is. > >> > >>> On Jan 16, 2017, at 7:42 PM, Mark Sims <[email protected]> wrote: > >>> > >>> On the chip with the "MX" marking on it, what f/w version does it > show (usually v5.02 or v5.10)? I have a couple of CM3's configured for > TAIP output, but I have the programs for switching them to TSIP or NMEA. > >>> > >>> ----------------------- > >>> > >>>> The module is basically a Trimble SveeSix-CM3 and is based on the > 25040 board. It’s labeled 26889-81 so is a variant of the standard TSIP > part. Can anyone help with a replacement? Exact replacement would be ideal > of course, but even a standard CM3 would be useful - I’ve done other > ‘conversions’ before. > >>> _______________________________________________ > >>> time-nuts mailing list -- [email protected] > >>> To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > >>> and follow the instructions there. > >> > >> > >> > >> ------------------------------ > >> > >> Message: 17 > >> Date: Tue, 17 Jan 2017 17:11:41 +1100 > >> From: Jason Ball <[email protected]> > >> To: Discussion of precise time and frequency measurement > >> <[email protected]> > >> Cc: Perry Sandeen <[email protected]> > >> Subject: Re: [time-nuts] Low CostTemperature sensor > >> Message-ID: > >> <CAOGCNM5VMG1+9ainJGdteodN2TAdf7-p0dKm5AgHhqJzYuKAeA@mail. > gmail.com> > >> Content-Type: text/plain; charset=UTF-8 > >> > >> Even cheaper... Diiode as a cheap sensor ? > >> > >> https://www.arrow.com/en/research-and-events/articles/ > using-a-simple-diode-as-a-ballpark-temperature-sensor > >> > >> > >> On Tue, Jan 17, 2017 at 4:16 PM, Bill Hawkins <[email protected]> > wrote: > >> > >>> Perrier, > >>> > >>> Google finds a Siemens NI1000 sensor that follows the nickel curve. > >>> Nickel is popular in industrial control for cost, but not as accurate > as > >>> platinum. Converting the platinum curve to accurate temperatures > >>> requires a second order equation, but has been done with 0.1% analog > >>> converters. > >>> > >>> Digi-key has ZNI devices as surface mount parts. Sparse data said > >>> nothing about a platinum curve. > >>> > >>> I'm curious because my former employer did very well selling platinum > >>> RTD sensors, usually 100 ohms at the triple point. > >>> > >>> Bill Hawkins > >>> > >>> > >>> -----Original Message----- > >>> From: time-nuts [mailto:[email protected]] On Behalf Of Perry > >>> Sandeen via time-nuts > >>> Sent: Monday, January 16, 2017 9:33 PM > >>> To: [email protected] > >>> Subject: [time-nuts] Low CostTemperature sensor > >>> > >>> List, > >>> A while back there was much discussion about temperature sensors. > >>> One simple inexpensive one to consider would be the ZNI1000Temperature > >>> sensor. > >>> It's 1K ohms at 0C and it replicates the temperature curve of the Pt 1K > >>> ohm sensors. > >>> It's about $3 from Digi-Key. > >>> FWIW YMMY > >>> Regards, > >>> Perrier > >>> _______________________________________________ > >>> time-nuts mailing list -- [email protected] To unsubscribe, go to > >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >>> and follow the instructions there. > >>> > >>> _______________________________________________ > >>> time-nuts mailing list -- [email protected] > >>> To unsubscribe, go to https://www.febo.com/cgi-bin/ > >>> mailman/listinfo/time-nuts > >>> and follow the instructions there. > >>> > >> > >> > >> > >> -- > >> -- > >> Teach your kids Science, or somebody else will :/ > >> > >> [email protected] > >> [email protected] <[email protected]> > >> callsign: vk2vjb > >> > >> > >> ------------------------------ > >> > >> Message: 18 > >> Date: Tue, 17 Jan 2017 01:52:15 -0500 > >> From: "Tom Miller" <[email protected]> > >> To: <[email protected]>, "Discussion of precise time and frequency > >> measurement" <[email protected]> > >> Subject: Re: [time-nuts] Low CostTemperature sensor > >> Message-ID: <8CF6E16948B44D838962535D0F36C2E5@FamilyHP> > >> Content-Type: text/plain; format=flowed; charset=utf-8; > >> reply-type=original > >> > >> That article has a major error. Anyone know what it is? > >> > >> > >> > >> ----- Original Message ----- > >> From: "Jason Ball" <[email protected]> > >> To: "Discussion of precise time and frequency measurement" > >> <[email protected]> > >> Cc: "Perry Sandeen" <[email protected]> > >> Sent: Tuesday, January 17, 2017 1:11 AM > >> Subject: Re: [time-nuts] Low CostTemperature sensor > >> > >> > >>> Even cheaper... Diiode as a cheap sensor ? > >>> > >>> https://www.arrow.com/en/research-and-events/articles/ > using-a-simple-diode-as-a-ballpark-temperature-sensor > >>> > >>> > >>> On Tue, Jan 17, 2017 at 4:16 PM, Bill Hawkins <[email protected]> > wrote: > >>> > >>>> Perrier, > >>>> > >>>> Google finds a Siemens NI1000 sensor that follows the nickel curve. > >>>> Nickel is popular in industrial control for cost, but not as accurate > as > >>>> platinum. Converting the platinum curve to accurate temperatures > >>>> requires a second order equation, but has been done with 0.1% analog > >>>> converters. > >>>> > >>>> Digi-key has ZNI devices as surface mount parts. Sparse data said > >>>> nothing about a platinum curve. > >>>> > >>>> I'm curious because my former employer did very well selling platinum > >>>> RTD sensors, usually 100 ohms at the triple point. > >>>> > >>>> Bill Hawkins > >>>> > >>>> > >>>> -----Original Message----- > >>>> From: time-nuts [mailto:[email protected]] On Behalf Of > Perry > >>>> Sandeen via time-nuts > >>>> Sent: Monday, January 16, 2017 9:33 PM > >>>> To: [email protected] > >>>> Subject: [time-nuts] Low CostTemperature sensor > >>>> > >>>> List, > >>>> A while back there was much discussion about temperature sensors. > >>>> One simple inexpensive one to consider would be the ZNI1000Temperature > >>>> sensor. > >>>> It's 1K ohms at 0C and it replicates the temperature curve of the Pt > 1K > >>>> ohm sensors. > >>>> It's about $3 from Digi-Key. > >>>> FWIW YMMY > >>>> Regards, > >>>> Perrier > >>>> _______________________________________________ > >>>> time-nuts mailing list -- [email protected] To unsubscribe, go to > >>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >>>> and follow the instructions there. > >>>> > >>>> _______________________________________________ > >>>> time-nuts mailing list -- [email protected] > >>>> To unsubscribe, go to https://www.febo.com/cgi-bin/ > >>>> mailman/listinfo/time-nuts > >>>> and follow the instructions there. > >>>> > >>> > >>> > >>> > >>> -- > >>> -- > >>> Teach your kids Science, or somebody else will :/ > >>> > >>> [email protected] > >>> [email protected] <[email protected]> > >>> callsign: vk2vjb > >>> _______________________________________________ > >>> time-nuts mailing list -- [email protected] > >>> To unsubscribe, go to > >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >>> and follow the instructions there. > >> > >> > >> > >> ------------------------------ > >> > >> Message: 19 > >> Date: Tue, 17 Jan 2017 04:17:25 -0500 > >> From: Charles Steinmetz <[email protected]> > >> To: [email protected] > >> Subject: Re: [time-nuts] Low CostTemperature sensor > >> Message-ID: <[email protected]> > >> Content-Type: text/plain; charset=utf-8; format=flowed > >> > >> Tom wrote: > >> > >>> That article has a major error. Anyone know what it is? > >> > >> Well, the author says the reverse current of a diode is "directly" > >> proportional to temperature. This could suggest that he means the > >> relationship is linear (the relationship is actually exponential with > >> absolute temperature). But that's not really an *error* -- just sloppy. > >> "Direct" does not necessarily imply "linear." An exponential > >> relationship is "direct" in the sense that it is what mathematicians > >> call "injective" (every temperature corresponds to exactly one value of > >> reverse current). > >> > >> Then, in discussing the LM95235, he says that it can use the > >> "collector-emitter junction diode" of a transistor as the sense element. > >> Of course, a bipolar transistor has no collector-emitter junction. > >> His diagram correctly shows a diode-connected NPN operating in the > >> active region (forward biased, not reverse biased as the rest of his > >> article discusses) as the sensor for the LM95235. > >> > >> Are any of these what you had in mind, or is there more? > >> > >> Charles > >> > >> > >> > >> ------------------------------ > >> > >> Message: 20 > >> Date: Tue, 17 Jan 2017 08:20:23 -0500 > >> From: Bob Camp <[email protected]> > >> To: Perry Sandeen <[email protected]>, Discussion of precise time > >> and frequency measurement <[email protected]> > >> Subject: Re: [time-nuts] How to create a super Rb standard > >> Message-ID: <[email protected]> > >> Content-Type: text/plain; charset=utf-8 > >> > >> Hi > >> > >> Since the physics package in the small Rb’s is different than the stuff > in the large units, > >> you have some basic limits on what you can do to improve them. The main > things people > >> have done are to modify them to turn off the temperature compensation > and replace it > >> with some sort of precision controlled thermal enclosure. Pressure > compensation is a good > >> idea on any of these parts (large or small). How much your particular > unit benefits is a > >> “that depends” sort of thing. > >> > >> Bob > >> > >>> On Jan 16, 2017, at 10:24 PM, Perry Sandeen via time-nuts < > [email protected]> wrote: > >>> > >>> > >>> List > >>> It looks like their is as infinitely small chance of being able to get > 5065. > >>> So what can be done with the telco Rb's (mine are analog tuned) to > wring the best possible performance from them? Sooper Duper power supplies, > Peltier (sp) cooling modules? > >>> Regards, > >>> Perrier > >>> _______________________________________________ > >>> time-nuts mailing list -- [email protected] > >>> To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > >>> and follow the instructions there. > >> > >> > >> > >> ------------------------------ > >> > >> Message: 21 > >> Date: Tue, 17 Jan 2017 14:10:12 +0000 > >> From: Scott Stobbe <[email protected]> > >> To: Discussion of precise time and frequency measurement > >> <[email protected]> > >> Subject: Re: [time-nuts] Low CostTemperature sensor > >> Message-ID: > >> <CALg-KtMYS4eNfa0Zf_41M50zxi75+GLbD+SkZUbNBa9+ > [email protected]> > >> Content-Type: text/plain; charset=UTF-8 > >> > >> Thermometry based on Diode leakage current wouldn't be impossible I > >> suppose, you might loose some hair in the process. > >> > >> The signal levels on the opamp are goofed too. > >> > >> On Tue, Jan 17, 2017 at 4:19 AM Charles Steinmetz < > [email protected]> > >> wrote: > >> > >>> Tom wrote: > >>> > >>> > >>> > >>>> That article has a major error. Anyone know what it is? > >>> > >>> > >>> > >>> Well, the author says the reverse current of a diode is "directly" > >>> > >>> proportional to temperature. This could suggest that he means the > >>> > >>> relationship is linear (the relationship is actually exponential with > >>> > >>> absolute temperature). But that's not really an *error* -- just > sloppy. > >>> > >>> "Direct" does not necessarily imply "linear." An exponential > >>> > >>> relationship is "direct" in the sense that it is what mathematicians > >>> > >>> call "injective" (every temperature corresponds to exactly one value of > >>> > >>> reverse current). > >>> > >>> > >>> > >>> Then, in discussing the LM95235, he says that it can use the > >>> > >>> "collector-emitter junction diode" of a transistor as the sense > element. > >>> > >>> Of course, a bipolar transistor has no collector-emitter junction. > >>> > >>> His diagram correctly shows a diode-connected NPN operating in the > >>> > >>> active region (forward biased, not reverse biased as the rest of his > >>> > >>> article discusses) as the sensor for the LM95235. > >>> > >>> > >>> > >>> Are any of these what you had in mind, or is there more? > >>> > >>> > >>> > >>> Charles > >>> > >>> > >>> > >>> _______________________________________________ > >>> > >>> time-nuts mailing list -- [email protected] > >>> > >>> To unsubscribe, go to > >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >>> > >>> and follow the instructions there. > >>> > >>> > >> > >> > >> ------------------------------ > >> > >> Message: 22 > >> Date: Tue, 17 Jan 2017 08:14:46 -0600 > >> From: John Ackermann N8UR <[email protected]> > >> To: Discussion of precise time and frequency measurement > >> <[email protected]> > >> Cc: [email protected] > >> Subject: Re: [time-nuts] TICC update? > >> Message-ID: <[email protected]> > >> Content-Type: text/plain; charset=UTF-8 > >> > >> Hi Scott -- > >> > >> We received the first-unit sample a couple of weeks ago and it > successfully passed all tests, so we gave the go-ahead to do the production > build. > >> > >> We've also sent the Contract Manufacturer the final software versions > to be loaded to the Arduino as well as a set of test oscillators for unit > testing. (The production code is in master at > https://github.com/TAPR/TICC) > >> > >> My project for this coming weekend is to get the user documentation > ready; it's also at GitHub. > >> > >> I don't know precisely where the CM is in the process right now, but > we're still looking for delivery to TAPR by early February. > >> > >> You can still order: http://tapr.org/kits_ticc.html > >> > >> John > >> > >> ---- > >> > >> On Jan 16, 2017, 10:17 PM, at 10:17 PM, Scott Newell < > [email protected]> wrote: > >>> I see that my credit card has been charged. Is that a hint that the > >>> TICC project is moving along? Should I start gathering up cables and > >>> SMA adapters? > >>> > >>> -- > >>> newell N5TNL > >>> > >>> _______________________________________________ > >>> time-nuts mailing list -- [email protected] > >>> To unsubscribe, go to > >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >>> and follow the instructions there. > >> > >> > >> ------------------------------ > >> > >> Subject: Digest Footer > >> > >> _______________________________________________ > >> time-nuts mailing list > >> [email protected] > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> > >> ------------------------------ > >> > >> End of time-nuts Digest, Vol 150, Issue 36 > >> ****************************************** > > > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
