Re: [time-nuts] Help for general GPIB problem
You probably want ibfind() rather than ibdev(). Take a look at gpibport.cpp in the TimeLab source (drivers/shared/gpibport.cpp under the installation folder), in the enumerate_ports() function. -- john, KE5FX Miles Design LLC > -Original Message- > From: time-nuts-boun...@febo.com [mailto:time-nuts- > boun...@febo.com] On Behalf Of Ulrich Bangert > Sent: Thursday, January 23, 2014 3:23 AM > To: Time nuts > Subject: [time-nuts] Help for general GPIB problem > > Gentlemen, > > I am just going to improve my EZGPIB utility so that it can make use of more > than one GPIB-interface (supported by GPIB32.Dll, not Prologix). I have > been > trying to enumerate all detected interfaces by using > > ibdev(bi,0,0,T300ms,0,1) > > in a loop where bi starts with "0" and is incremented by "1" until the > result of the call gets negative. Much to my surprise this loop detects 4 > (!) interfaces GPIB0 to GPIB3 even if absolutely NO interface is connected > to the pc. > > What am I doing wrong. Is "4" the maximum number of interfaces that may > be > handled by GPIB32.Dll > > What do I need to do to find the real number of detected interfaces ? > > Best regards and TIA for your answers > > Ulrich Bangert > www.ulrich-bangert.de > Ortholzer Weg 1 > 27243 Gross Ippener > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi- > bin/mailman/listinfo/time-nuts > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Z3816A Control and Cleaning
Folks, soap and detergent are not the same thing. Larry On 1/23/2014 11:22 PM, Glenn Little wrote: Tektronix used to clean their oscilloscopes in a soap and water bath in something like a dish washer. This was published in Tek Scope V4 #4 July 1972. I can send the pdf if interested. Glenn WB4UIV ... -- Best wishes, Larry McDavid W6FUB Anaheim, California (SE of Los Angeles, near Disneyland) ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Z3816A Control and Cleaning
Tektronix used to clean their oscilloscopes in a soap and water bath in something like a dish washer. This was published in Tek Scope V4 #4 July 1972. I can send the pdf if interested. Glenn WB4UIV At 10:13 PM 1/23/2014, you wrote: Joe Been a while. Sounds like a reasonable approach with the soap and water. The key is not to force water into the inductors. I take soapy water and a tooth brush it works wonders. Then dry in an oven at about 100 degrees just to drive off the moisture. Very gentle. I guess the other point is to get a better feel for the gunk. Does soap and water do it. The fact that IPA didn't is interesting. It may be oil based. Good luck Paul WB8TSL/1 On Thu, Jan 23, 2014 at 9:41 PM, J. L. Trantham wrote: > I recently acquired a Z3816A as a 'spare' and it does not work reliably. > The ALARM LED sometimes comes on and sometimes doesn't. Sometimes it > tracks > and locks appropriately and other times it goes into HOLDOVER. The main > PCB > is very dirty and has the appearance that it has been in a humid and dusty > environment. I am suspicious that there are some 'leakage' issues related > to this dirt and would like to wash the board. What would the group > recommend for cleaning the board? I sprayed it with 91% IPA and used a > paint brush to try to clean the board. Some improvement but still dirty. > I > was thinking of warm soapy water with a paint brush followed by warm water > followed by 91% IPA followed by a hairdryer then an hour or two in an oven > at about 100 to 150 degrees F. Thoughts? I'm a bit concerned about the > inductors and the possibility of water leading to problems with them. > > > > Also, I seem to recall a command that can be sent by SatStat to change from > GPS time to UTC time but I can't find it in my files. Is there such a > command or am I hallucinating? > > > > Thanks in advance. > > > > Joe > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Z3816A Control and Cleaning
> Also, I seem to recall a command that can be sent by SatStat to change from > GPS time to UTC time but I can't find it in my files. Is there such a > command or am I hallucinating? My notes for the Z3801A say: :diag:gps:utc 1 http://www.realhamradio.com/GPS_User_Notes.htm (undocumented) -- These are my opinions. I hate spam. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Z3816A Control and Cleaning
> The main PCB is very dirty and has the appearance that it has been in a > humid and dusty environment. I am suspicious that there are some 'leakage' > issues related to this dirt and would like to wash the board. What would > the group recommend for cleaning the board? Google for >PCB cleaning dishwasher< 1/2 :), but you will get a lot of hits. > I'm a bit concerned about the inductors and the possibility of water leading > to problems with them. You could look at the manufacturers data sheets and see what they say about washing. It is or was common practice to run PCBs through some sort of washing step after they get out of the wave solder machine. If parts can't take that, there is usually a warning in the data sheet. If you can't find the manufacturer/model, check data sheets for parts that look similar. -- These are my opinions. I hate spam. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Looking for Dual-Time "Atomic Clock"
> I guess you would have to change its time zone when the rest of the country > changes to/from Daylight Saving time, but that's probably true of most of > them. There is a DST bit in the WWVB packet format. (actually 2 of them) http://en.wikipedia.org/wiki/WWVB#Announcement_bits Of course, you need a switch for the "we don't do DST" places or you (they) have to do it manually. -- These are my opinions. I hate spam. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Looking for Dual-Time "Atomic Clock"
You are correct, I missed that. If the one I have on order doesn't work, I'll get one of those. Thanks for the heads-up, 73, Dick, W1KSZ On 1/23/2014 1:56 PM, Andy wrote: Richard wrote: "The 121B will only offset the 5 NA Time Zones." And Zulu too, right? So aside from the size, it meets your requirements, right? I guess you would have to change its time zone when the rest of the country changes to/from Daylight Saving time, but that's probably true of most of them. Andy ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Morion MV89A position
Hello all, I have had a MV89A running now for a couple of years now. It is inside of a Dewar along with bypassing capacitors and the adjustment pot. The end is sealed insulation. For a matter of convenience the oscillator is mounted upside down. I am planning on reconfiguring the box it is in and adding a divider circuit and some other items. So 2 questions 1) Is the fact that the mv89a is inside a Dewar causing any short term or long term adverse effects? 2) Is running the oscillator in the upside down position having any adverse effects? Since I am reconfiguring the box, I plan on mounting the oscillator in the best possible position, and sealing up the Dewar. Any comments please? PaulC W1VLF ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Looking for Dual-Time "Atomic Clock"
Well, of course you can. You can do that with any clock. Claiming that it can be synced to WWV without stating "manually" is misleading. Stating that it _must_ be done manually is redundant. No wonder their manual makes no mention of this supposed "feature". Brian Garrett -Original Message- From: bjon...@mindspring.com Sent: Thursday, January 23, 2014 12:14 PM To: time-nuts@febo.com Subject: Re: [time-nuts] Looking for Dual-Time "Atomic Clock" On Thu, 2014-01-23 at 12:58 -0700, Brian Inglis wrote: Looks like MFJ-108B http://www.mfjenterprises.com/Product.php?productid=MFJ-108B fits your specs at a quarter the price, and it says it can be synced to WWV, although their product manual (single page setting guide) does not mention that feature. I had a MFJ-108B but I ended up giving it away. When I bought it I was told it would sync to WWV, however they failed to mention you have to do it manually (i.e listen to WWVB and hit some buttons on the clocks at the right second). -Brian ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Looking for Dual-Time "Atomic Clock"
Richard wrote: "The 121B will only offset the 5 NA Time Zones." And Zulu too, right? So aside from the size, it meets your requirements, right? I guess you would have to change its time zone when the rest of the country changes to/from Daylight Saving time, but that's probably true of most of them. Andy ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Lady heather plus NTP server?
I did a quick comparison between Lady Heather under Wine+Linux, Lady Heather under Win7, and WWV. The NTP time on my office machine agrees with WWV on 5 MHz as closely as my eyes and ears can tell. Linux is running its default NTP, Win7 is running Meinberg (as I recall). LH updates its time display about a moment later. (Moment == 200milliseconds in Psychology. I remember that because I got it wrong on a college psych quiz.) I suppose one would have to use GPS 1pps to do much better than NTP over a good internet connection. -- Chuck Forsberg WA7KGX c...@omen.com www.omen.com Developer of Industrial ZMODEM(Tm) for Embedded Applications Omen Technology Inc "The High Reliability Software" 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Z3816A Control and Cleaning
I recommend against using tap water on any electronics. Use RO or distilled water; that won't leave behind minerals when it evaporates. Most IPA is only 70%; the balance is water. For flux removal, use 99% or anhydrous IPA, available at most industrial hardware stores. And, I surely would not use "soap" of any kind. You can use a detergent but only a tiny amount is needed to reduce the surface tension. If you don't get it all off by flushing, residue after evaporation of any surfactant is not good... Larry On 1/23/2014 7:13 PM, paul swed wrote: Joe Been a while. Sounds like a reasonable approach with the soap and water. The key is not to force water into the inductors. I take soapy water and a tooth brush it works wonders. Then dry in an oven at about 100 degrees just to drive off the moisture. Very gentle. I guess the other point is to get a better feel for the gunk. Does soap and water do it. The fact that IPA didn't is interesting. It may be oil based. Good luck Paul WB8TSL/1 On Thu, Jan 23, 2014 at 9:41 PM, J. L. Trantham wrote: I recently acquired a Z3816A as a 'spare' and it does not work reliably. The ALARM LED sometimes comes on and sometimes doesn't. Sometimes it tracks and locks appropriately and other times it goes into HOLDOVER. The main PCB is very dirty and has the appearance that it has been in a humid and dusty environment. I am suspicious that there are some 'leakage' issues related to this dirt and would like to wash the board. What would the group recommend for cleaning the board? I sprayed it with 91% IPA and used a paint brush to try to clean the board. Some improvement but still dirty. I was thinking of warm soapy water with a paint brush followed by warm water followed by 91% IPA followed by a hairdryer then an hour or two in an oven at about 100 to 150 degrees F. Thoughts? I'm a bit concerned about the inductors and the possibility of water leading to problems with them. Also, I seem to recall a command that can be sent by SatStat to change from GPS time to UTC time but I can't find it in my files. Is there such a command or am I hallucinating? Thanks in advance. Joe ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- Best wishes, Larry McDavid W6FUB Anaheim, California (SE of Los Angeles, near Disneyland) ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Lady heather plus NTP server?
i think most people run LH on Linux either VMWare or Wine. That might be your first move. Virtualize the windows system and run LH on that.It make it better really because then you can export the display over the network. So, install Linux on the PC, then run Windows on that Maybe one way we will get lucky and some one will port LH to Linux/UNIX. I have 1,000 project higher up on the list. On Thu, Jan 23, 2014 at 4:33 PM, ken johnson wrote: > Thanks for the reply Scott- but I have to say I am a little confused, LH is > running on a windows box and the program you pointed to is a linux one- am > I missing something here? > > Ken. > > > On Fri, Jan 24, 2014 at 8:10 AM, Scott Mace wrote: > > > Try this: > > > > http://www.febo.com/pipermail/time-nuts/2010-February/044476.html > > > > It uses the NTP SHM reference clock. > > > > Scott > > > > On 01/20/2014 09:01 PM, ken johnson wrote: > > > >> I currently have my router/firewall acting as both an NTP client, > getting > >> it's time from the net, and an NTP server serving my home network. Now I > >> have my thunderbolt and Lady heather working nicely, I would like to > have > >> that machine act as the ntp server for my network, but it appears ntp > >> can't > >> understand tsip, and also with LH taking the com port, I can't see a way > >> of > >> ntp getting the data anyway. > >> > >> Is this possible to do, and if so, can anyone give me some clues as to > >> how? > >> > >> Thanks, Ken. > >> ___ > >> time-nuts mailing list -- time-nuts@febo.com > >> To unsubscribe, go to https://www.febo.com/cgi-bin/ > >> mailman/listinfo/time-nuts > >> and follow the instructions there. > >> > >> ___ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to https://www.febo.com/cgi-bin/ > > mailman/listinfo/time-nuts > > and follow the instructions there. > > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > -- Chris Albertson Redondo Beach, California ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Examples of leap-seconds in local timezones
On 23/01/14 14:29, Wojciech Owczarek wrote: Magnus, I have little experience with radio-based public time dissemination services, but some with GPS/NTP/PTP, so here's some info - hope it's of some value to you. For US and European exchanges, the leap second time happens outside trading hours, so maybe that's why we've heard little (horror) stories. This is definitely not an easy thing to deal with during trading, unless your messaging protocol actually has specific leap second extensions - which I'm not aware of any of the ones I know having. I was looking for examples closer to the international date-line. Cheers, Magnus ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Z3816A Control and Cleaning
Joe Been a while. Sounds like a reasonable approach with the soap and water. The key is not to force water into the inductors. I take soapy water and a tooth brush it works wonders. Then dry in an oven at about 100 degrees just to drive off the moisture. Very gentle. I guess the other point is to get a better feel for the gunk. Does soap and water do it. The fact that IPA didn't is interesting. It may be oil based. Good luck Paul WB8TSL/1 On Thu, Jan 23, 2014 at 9:41 PM, J. L. Trantham wrote: > I recently acquired a Z3816A as a 'spare' and it does not work reliably. > The ALARM LED sometimes comes on and sometimes doesn't. Sometimes it > tracks > and locks appropriately and other times it goes into HOLDOVER. The main > PCB > is very dirty and has the appearance that it has been in a humid and dusty > environment. I am suspicious that there are some 'leakage' issues related > to this dirt and would like to wash the board. What would the group > recommend for cleaning the board? I sprayed it with 91% IPA and used a > paint brush to try to clean the board. Some improvement but still dirty. > I > was thinking of warm soapy water with a paint brush followed by warm water > followed by 91% IPA followed by a hairdryer then an hour or two in an oven > at about 100 to 150 degrees F. Thoughts? I'm a bit concerned about the > inductors and the possibility of water leading to problems with them. > > > > Also, I seem to recall a command that can be sent by SatStat to change from > GPS time to UTC time but I can't find it in my files. Is there such a > command or am I hallucinating? > > > > Thanks in advance. > > > > Joe > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Looking for Dual-Time "Atomic Clock"
>What I am looking for is a way to display Local Time (MST) and Zulu (GMT) time in a small (6" X 8" or similar) package. There must be two >displays and both lock up to NBS.Has anyone seen such a thing ? A tad bigger then your request: http://www.atsclock.com/items/poe-digital-clocks.cfm?catID=102 We are using them at N2MO: http://www.sarex.us/temp_pix/thumb_9116_18_013.jpg Martin Flynn ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Lady heather plus NTP server?
Thanks for the reply Scott- but I have to say I am a little confused, LH is running on a windows box and the program you pointed to is a linux one- am I missing something here? Ken. On Fri, Jan 24, 2014 at 8:10 AM, Scott Mace wrote: > Try this: > > http://www.febo.com/pipermail/time-nuts/2010-February/044476.html > > It uses the NTP SHM reference clock. > > Scott > > On 01/20/2014 09:01 PM, ken johnson wrote: > >> I currently have my router/firewall acting as both an NTP client, getting >> it's time from the net, and an NTP server serving my home network. Now I >> have my thunderbolt and Lady heather working nicely, I would like to have >> that machine act as the ntp server for my network, but it appears ntp >> can't >> understand tsip, and also with LH taking the com port, I can't see a way >> of >> ntp getting the data anyway. >> >> Is this possible to do, and if so, can anyone give me some clues as to >> how? >> >> Thanks, Ken. >> ___ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/ >> mailman/listinfo/time-nuts >> and follow the instructions there. >> >> ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Z3816A Control and Cleaning
I recently acquired a Z3816A as a 'spare' and it does not work reliably. The ALARM LED sometimes comes on and sometimes doesn't. Sometimes it tracks and locks appropriately and other times it goes into HOLDOVER. The main PCB is very dirty and has the appearance that it has been in a humid and dusty environment. I am suspicious that there are some 'leakage' issues related to this dirt and would like to wash the board. What would the group recommend for cleaning the board? I sprayed it with 91% IPA and used a paint brush to try to clean the board. Some improvement but still dirty. I was thinking of warm soapy water with a paint brush followed by warm water followed by 91% IPA followed by a hairdryer then an hour or two in an oven at about 100 to 150 degrees F. Thoughts? I'm a bit concerned about the inductors and the possibility of water leading to problems with them. Also, I seem to recall a command that can be sent by SatStat to change from GPS time to UTC time but I can't find it in my files. Is there such a command or am I hallucinating? Thanks in advance. Joe ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Nortel GPSDO osc age alarm
The OSC age alarm says the oscillator EFC control voltage is getting near to its programmed limit. The DAC alarm says that the EFC dac setting is it is at the limit. I suspect that your oscillator EFC input is bad. I've seen this on a couple of boards. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Help for general GPIB problem
OK, understood. So it seems that the next step is to try to connect with those reported devices and see if an error is returned, identifying the really connected ones from the placeholders... On Thu, Jan 23, 2014 at 5:00 PM, Ulrich Bangert wrote: > Azelio, > >> Try to stop the HPIB driver... > > I do not have any HPIB (=HP specific) driver in my system. Instead I use the > GPIB32.DLL that comes together with every National Instruments GPIB > interface adapter. The DLL is basically thought as the National Instruments > support for C-Programmers but I wrote a wrapper unit to be able to use the > DLL from my Delphi programming environment. > > The DLL is the BASIC translation between software and hardware and can > hardly been left away. It is responsible for the fact that you can use the > same DLL function calls regardless of what physical interface is used, i.e. > it works with a PCI plugin card as well as with USB to GPIB adapters as well > as with network based GPIB adapters (as long as the all come from NI). That > is one of the really NEAT things with NI stuff. > > Best regards > Ulrich > > > >> -Ursprungliche Nachricht- >> Von: time-nuts-boun...@febo.com >> [mailto:time-nuts-boun...@febo.com] Im Auftrag von Azelio Boriani >> Gesendet: Donnerstag, 23. Januar 2014 14:27 >> An: Discussion of precise time and frequency measurement >> Betreff: Re: [time-nuts] Help for general GPIB problem >> >> >> Try to stop the HPIB driver... maybe the driver is reporting >> as available even if no hardware is actually connected. >> >> On Thu, Jan 23, 2014 at 12:22 PM, Ulrich Bangert >> wrote: >> > Gentlemen, >> > >> > I am just going to improve my EZGPIB utility so that it can >> make use >> > of more than one GPIB-interface (supported by GPIB32.Dll, not >> > Prologix). I have been trying to enumerate all detected >> interfaces by >> > using >> > >> > ibdev(bi,0,0,T300ms,0,1) >> > >> > in a loop where bi starts with "0" and is incremented by >> "1" until the >> > result of the call gets negative. Much to my surprise this loop >> > detects 4 >> > (!) interfaces GPIB0 to GPIB3 even if absolutely NO >> interface is connected >> > to the pc. >> > >> > What am I doing wrong. Is "4" the maximum number of interfaces that >> > may be handled by GPIB32.Dll >> > >> > What do I need to do to find the real number of detected interfaces >> > ? >> > >> > Best regards and TIA for your answers >> > >> > Ulrich Bangert >> > www.ulrich-bangert.de >> > Ortholzer Weg 1 >> > 27243 Gross Ippener >> > >> > ___ >> > time-nuts mailing list -- time-nuts@febo.com >> > To unsubscribe, go to >> > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> > and follow the instructions there. >> ___ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Nortel GPSDO osc age alarm
Hi That’s a cell phone base station board. It’s got a bunch of outputs, some of which are related to the cell network it was built for rather than 10MHz. I’d bet your 9.8 MHz output is one of those. They are DDS based so there likely is some range of possible outputs. The age alarm is not unusual on a newly powered up board. It’s moving faster than it should. It may settle down. The DAC at limit is not a real good sign …. Bob On Jan 23, 2014, at 6:43 PM, Volker Esper wrote: > Hi! > > I bought a Trimble/Nortel GPSDO > > http://www.ebay.de/itm/300933951405?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2648 > > and Lady Heather's now tells me that everything is alright - except > - DAC 6.04V > - OSC BAD > - osc age alarm > > The rectangle "10MHz" output signal (J5) shows a signal at about 9.8MHz > (a deviation of about 200kHz), wobbling 4Hz up and down. Oddly enough, > the direct oscillator output (J4) shows a sine wave at a stable > 10.004MHz (a deviation of 0.4Hz). > > It seems to me it's not the oscillator that is bad but the servo loop - > what can I do? > > Thank you > > Volker > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Nortel GPSDO osc age alarm
Hi! I bought a Trimble/Nortel GPSDO http://www.ebay.de/itm/300933951405?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2648 and Lady Heather's now tells me that everything is alright - except - DAC 6.04V - OSC BAD - osc age alarm The rectangle "10MHz" output signal (J5) shows a signal at about 9.8MHz (a deviation of about 200kHz), wobbling 4Hz up and down. Oddly enough, the direct oscillator output (J4) shows a sine wave at a stable 10.004MHz (a deviation of 0.4Hz). It seems to me it's not the oscillator that is bad but the servo loop - what can I do? Thank you Volker ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] PICPET- was Affordable (cheap) COTS (etc)
That´s a big problem. To go sub-100ns you must make frequency > 10Mhz, and most of these chips only run at >10MHz using internal PLLs (you can´t directly clock them with more than about 20MHz.. or at least the datasheet says so). A FPGA has no such problems (or at least they are very atenuated because you can directly clock them at 200Mhz easily). But.. have anyone looked at the CTMU as an interval counter? Daniel Em 23/01/2014 19:00, Tom Van Baak escreveu: Has anyone else looked at the Parallax Propeller processor for timing functions? Hi Brian, Oh yes. Really nice chip. But for precise timing applications I had huge problems with phase and temperature stability of its internal PLL. I tried half a dozen different boards purchased over several years. Tech support was not interested in someone who worried about nanoseconds. The architecture is really interesting, but it is such an odd chip, with almost zero market visibility these days, that I set aside the goal of using it as the basis of a general purpose 8-channel 6 ns precision counter. You can find various timer and counter examples at obex.parallax.com. If you make progress on the project, please let me know, ok? By contrast, the PIC chips I use are fully synchronous so when you use 10 MHz atomic references the clock/output jitter and phase stability is almost below what I can measure here. Maybe under 2 ps. So that's why I use PIC's as the basis of all my picDIV and picPET projects. But I'm open to using something different in the future. /tvb ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] PICPET- was Affordable (cheap) COTS (etc)
Good thread. Yes I am very aware of the parallax propeller. As you both say kind of a crazy chip. I have used another product the SXB micros. They run Basic at 80 Mhz and are so cheap that If I have more than a few chips I just switch over. Unfortunately they are obsolete in the dip form. When I looked at the propeller my take away was that it was such an odd chip I actually did not want to deal with it figuring its life was just a few years. Its advantage was the ability to have so many things running in parallel. The great thing about the PICs are there are such a wide diversity of them at really cheap prices. Tom thanks for the insight on the synchronous clock. Did not realize that. Regards Paul WB8TSL On Thu, Jan 23, 2014 at 4:00 PM, Tom Van Baak wrote: > > Has anyone else looked at the Parallax Propeller processor for timing > > functions? > > Hi Brian, > > Oh yes. Really nice chip. But for precise timing applications I had huge > problems with phase and temperature stability of its internal PLL. I tried > half a dozen different boards purchased over several years. Tech support > was not interested in someone who worried about nanoseconds. > > The architecture is really interesting, but it is such an odd chip, with > almost zero market visibility these days, that I set aside the goal of > using it as the basis of a general purpose 8-channel 6 ns precision > counter. You can find various timer and counter examples at > obex.parallax.com. If you make progress on the project, please let me > know, ok? > > By contrast, the PIC chips I use are fully synchronous so when you use 10 > MHz atomic references the clock/output jitter and phase stability is almost > below what I can measure here. Maybe under 2 ps. So that's why I use PIC's > as the basis of all my picDIV and picPET projects. But I'm open to using > something different in the future. > > /tvb > > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Lady heather plus NTP server?
Try this: http://www.febo.com/pipermail/time-nuts/2010-February/044476.html It uses the NTP SHM reference clock. Scott On 01/20/2014 09:01 PM, ken johnson wrote: I currently have my router/firewall acting as both an NTP client, getting it's time from the net, and an NTP server serving my home network. Now I have my thunderbolt and Lady heather working nicely, I would like to have that machine act as the ntp server for my network, but it appears ntp can't understand tsip, and also with LH taking the com port, I can't see a way of ntp getting the data anyway. Is this possible to do, and if so, can anyone give me some clues as to how? Thanks, Ken. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] PICPET- was Affordable (cheap) COTS (etc)
> Has anyone else looked at the Parallax Propeller processor for timing > functions? Hi Brian, Oh yes. Really nice chip. But for precise timing applications I had huge problems with phase and temperature stability of its internal PLL. I tried half a dozen different boards purchased over several years. Tech support was not interested in someone who worried about nanoseconds. The architecture is really interesting, but it is such an odd chip, with almost zero market visibility these days, that I set aside the goal of using it as the basis of a general purpose 8-channel 6 ns precision counter. You can find various timer and counter examples at obex.parallax.com. If you make progress on the project, please let me know, ok? By contrast, the PIC chips I use are fully synchronous so when you use 10 MHz atomic references the clock/output jitter and phase stability is almost below what I can measure here. Maybe under 2 ps. So that's why I use PIC's as the basis of all my picDIV and picPET projects. But I'm open to using something different in the future. /tvb ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Looking for Dual-Time "Atomic Clock"
The 121B will only offset the 5 NA Time Zones. 73, Dick, W1KSZ On 1/23/2014 12:58 PM, Brian Inglis wrote: On 2014-01-21 22:53, Andy wrote: Dick asked, What I am looking for is a way to display Local Time (MST) and Zulu (GMT) time in a small (6" X 8" or similar) package. There must be two displays and both lock up to NBS. Has anyone seen such a thing ? Might not meet all your specs, but MFJ may have something: http://www.mfjenterprises.com/Product.php?productid=MFJ-121B (too big?) http://www.mfjenterprises.com/Product.php?productid=MFJ-133RC (shows only one zone at a time?) Looks like MFJ-108B http://www.mfjenterprises.com/Product.php?productid=MFJ-108B fits your specs at a quarter the price, and it says it can be synced to WWV, although their product manual (single page setting guide) does not mention that feature. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Looking for Dual-Time "Atomic Clock"
I have one of those. One clock runs fast, one runs slow. Maybe if I average them out 73, Dick, W1KSZ On 1/23/2014 1:14 PM, bjon...@mindspring.com wrote: On Thu, 2014-01-23 at 12:58 -0700, Brian Inglis wrote: Looks like MFJ-108B http://www.mfjenterprises.com/Product.php?productid=MFJ-108B fits your specs at a quarter the price, and it says it can be synced to WWV, although their product manual (single page setting guide) does not mention that feature. I had a MFJ-108B but I ended up giving it away. When I bought it I was told it would sync to WWV, however they failed to mention you have to do it manually (i.e listen to WWVB and hit some buttons on the clocks at the right second). -Brian ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Looking for Dual-Time "Atomic Clock"
On Thu, 2014-01-23 at 12:58 -0700, Brian Inglis wrote: > Looks like MFJ-108B > http://www.mfjenterprises.com/Product.php?productid=MFJ-108B fits > your specs at a quarter the price, and it says it can be synced to WWV, > although their > product manual (single page setting guide) does not mention that feature. > I had a MFJ-108B but I ended up giving it away. When I bought it I was told it would sync to WWV, however they failed to mention you have to do it manually (i.e listen to WWVB and hit some buttons on the clocks at the right second). -Brian ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Looking for Dual-Time "Atomic Clock"
On 2014-01-21 22:53, Andy wrote: Dick asked, What I am looking for is a way to display Local Time (MST) and Zulu (GMT) time in a small (6" X 8" or similar) package. There must be two displays and both lock up to NBS. Has anyone seen such a thing ? Might not meet all your specs, but MFJ may have something: http://www.mfjenterprises.com/Product.php?productid=MFJ-121B (too big?) http://www.mfjenterprises.com/Product.php?productid=MFJ-133RC (shows only one zone at a time?) Looks like MFJ-108B http://www.mfjenterprises.com/Product.php?productid=MFJ-108B fits your specs at a quarter the price, and it says it can be synced to WWV, although their product manual (single page setting guide) does not mention that feature. -- Take care. Thanks, Brian Inglis ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] PICPET- was Affordable (cheap) COTS (etc)
As usual the" hardware" peripherals integrated in microprocessors are not really independent from the core: the capture signal must be synchronized with the microprocessor's clock to enter the core. This require usually a clock with double the speed you need for a real hardware counter implemented, for example, in an FPGA or CPLD (or double the resolution for the same clock). On Thu, Jan 23, 2014 at 8:25 PM, Brian Lloyd wrote: > Has anyone else looked at the Parallax Propeller processor for timing > functions? It has 8 cooperative cores and has a number of intrinsic timing > functions for measuring intervals accurately, or for generating > tightly-timed repetitive pulse trains, within the frequency accuracy range > of the processor's clock. (Up to 80MHz by spec but the chip runs at 100MHz > just fine.) One can dedicate one or more cores to performing the low-level > timing functions while using another core to handle housekeeping functions > asynchronously. The only real limitation I have encountered is no built-in > A:D or D:A. (Low-pass filtered PWM is how I handle D:A usually.) The > processor is 32-bit throughout so one can do reasonable timing operations > using integer arithmetic. > > Using the Propeller to discipline an oscillator using 1pps would be > trivial. Use the oscillator to be disciplined as the processor's clock and > use the 1pps to gate an accumulator. (Use the internal PLL to multiply the > reference oscillator up to 40 or 80 MHz to increase resolution in the > accumulator.) This operation is performed with a single machine > instruction. You just let one core sit there and process the error > accumulation from the reference and the 1pps while another core processes > the error and sets a third core generating the PWM error signal to correct > the reference. Using multiple cores means that one really doesn't have to > worry much about interrupt latency (just poll) or race conditions. > > -- > Brian Lloyd, WB6RQN/J79BPL > 706 Flightline Drive > Spring Branch, TX 78070 > br...@lloyd.com > +1.916.877.5067 > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Affordable (cheap) COTS / eBay kit for TIE / 1PPS phase comparison
Wojciech, On 23/01/14 14:46, Wojciech Owczarek wrote: Thanks for your suggestions so far everyone, The picPET would be a great solution if it could run at higher frequencies - but now there's a separate thread about that :) Magnus - my reference is a Brilliant Telecom (now Juniper Networks TCA series) PTP grandmaster (TCA8000), which does PTP and has E1/T1/BITS/frequency outputs. Internally it uses a Trimble Resolution T board for GPS/PPS. I think it could run Rubidium if I replaced the OCXO with a SpectraTime LPFRS. Doesn't sound like a bad start. I'm familiar with Stable32 and I have a basic understanding of frequency stability / phase noise measurement concepts, but for the most part I will be simply looking at realtime phase offset measurement to test filtering and PI servo optimisations. Ah, yes. Then you are off to a good start. Timelab will serve you well then. You might enjoy Stefano Breggni:s book in that case. Cheers, Magnus ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] PICPET- was Affordable (cheap) COTS (etc)
Has anyone else looked at the Parallax Propeller processor for timing functions? It has 8 cooperative cores and has a number of intrinsic timing functions for measuring intervals accurately, or for generating tightly-timed repetitive pulse trains, within the frequency accuracy range of the processor's clock. (Up to 80MHz by spec but the chip runs at 100MHz just fine.) One can dedicate one or more cores to performing the low-level timing functions while using another core to handle housekeeping functions asynchronously. The only real limitation I have encountered is no built-in A:D or D:A. (Low-pass filtered PWM is how I handle D:A usually.) The processor is 32-bit throughout so one can do reasonable timing operations using integer arithmetic. Using the Propeller to discipline an oscillator using 1pps would be trivial. Use the oscillator to be disciplined as the processor's clock and use the 1pps to gate an accumulator. (Use the internal PLL to multiply the reference oscillator up to 40 or 80 MHz to increase resolution in the accumulator.) This operation is performed with a single machine instruction. You just let one core sit there and process the error accumulation from the reference and the 1pps while another core processes the error and sets a third core generating the PWM error signal to correct the reference. Using multiple cores means that one really doesn't have to worry much about interrupt latency (just poll) or race conditions. -- Brian Lloyd, WB6RQN/J79BPL 706 Flightline Drive Spring Branch, TX 78070 br...@lloyd.com +1.916.877.5067 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] PICPET- was Affordable (cheap) COTS (etc)
Hi Azelio, One of the internal timers is exactly what I was thinking of. I haven't gotten into this yet, but it looks like the dsPIC33 can accept a high quality reference clock as an input, and then use a multiplier to get it up above 100MHz. I think 200MHz is the limit in some packages. My idea was to run one of the timers at the internal clock rate, and use interrupts to pull out the timer values for start and stop. Get the difference, scale appropriately, and this would be the interval plus/minus PLL jitter. In fact, it might take a couple of timers, each scaled differently, to get a usable value from it. I haven't looked to see the size of the timers yet. It's just blue sky at the moment. > > From: Azelio Boriani >To: Discussion of precise time and frequency measurement >Sent: Thursday, January 23, 2014 7:24 AM >Subject: Re: [time-nuts] PICPET- was Affordable (cheap) COTS (etc) > > >It seems that that the QEI on a dsPIC are internal hardware counters >decoding the A/B phases of optical encoders: are you sure that they >can be used like a time interval counter? Better to use the timer >capture dedicated input. > > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Help for general GPIB problem
Azelio, > Try to stop the HPIB driver... I do not have any HPIB (=HP specific) driver in my system. Instead I use the GPIB32.DLL that comes together with every National Instruments GPIB interface adapter. The DLL is basically thought as the National Instruments support for C-Programmers but I wrote a wrapper unit to be able to use the DLL from my Delphi programming environment. The DLL is the BASIC translation between software and hardware and can hardly been left away. It is responsible for the fact that you can use the same DLL function calls regardless of what physical interface is used, i.e. it works with a PCI plugin card as well as with USB to GPIB adapters as well as with network based GPIB adapters (as long as the all come from NI). That is one of the really NEAT things with NI stuff. Best regards Ulrich > -Ursprungliche Nachricht- > Von: time-nuts-boun...@febo.com > [mailto:time-nuts-boun...@febo.com] Im Auftrag von Azelio Boriani > Gesendet: Donnerstag, 23. Januar 2014 14:27 > An: Discussion of precise time and frequency measurement > Betreff: Re: [time-nuts] Help for general GPIB problem > > > Try to stop the HPIB driver... maybe the driver is reporting > as available even if no hardware is actually connected. > > On Thu, Jan 23, 2014 at 12:22 PM, Ulrich Bangert > wrote: > > Gentlemen, > > > > I am just going to improve my EZGPIB utility so that it can > make use > > of more than one GPIB-interface (supported by GPIB32.Dll, not > > Prologix). I have been trying to enumerate all detected > interfaces by > > using > > > > ibdev(bi,0,0,T300ms,0,1) > > > > in a loop where bi starts with "0" and is incremented by > "1" until the > > result of the call gets negative. Much to my surprise this loop > > detects 4 > > (!) interfaces GPIB0 to GPIB3 even if absolutely NO > interface is connected > > to the pc. > > > > What am I doing wrong. Is "4" the maximum number of interfaces that > > may be handled by GPIB32.Dll > > > > What do I need to do to find the real number of detected interfaces > > ? > > > > Best regards and TIA for your answers > > > > Ulrich Bangert > > www.ulrich-bangert.de > > Ortholzer Weg 1 > > 27243 Gross Ippener > > > > ___ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Looking for Dual-Time "Atomic Clock"
It was in response to the suggestion I look at BRG Precision. 73, Dick, W1KSZ On 1/23/2014 5:57 AM, Didier Juges wrote: Hi Dick, "They look very nice, but kind of big for my desktop !!" Not very clear about what message you were responding to... Didier On Wed, Jan 22, 2014 at 4:19 PM, Richard Solomon wrote: They look very nice, but kind of big for my desktop !! Thanks anyway, 73, Dick, W1KSZ On 1/22/2014 12:37 PM, Bill Woodcock wrote: All the ones we use are from BRG Precision Products: http://www.brgprecision.com/products/time_zone_displays/index.php Here's what it looks like on the wall: https://www.pch.net/dnssec/zrh -Bill ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/ mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/ mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] PICPET- was Affordable (cheap) COTS (etc)
The picPET is vastly different from an Arduino. My goal with the picPET was to make a self-contained, single-chip, works-out-of-the-box continuous time-stamping event counter with an $1 8-pin DIP chip, even if the resolution wasn't good by time nut standards. You can see how simple it is: http://leapsecond.com/pic/ It turned out really well and is useful for many sub-microsecond timing projects. I do not use it to compare high-end GPS, rubidium, or cesium clocks. That's a different class of measurement. Note most microcontroller based time interval counters or frequency counters are not suited for high-accuracy or long-term measurement because they lose cycles with sloppy hardware or poor software design and depend on cheap crystal oscillators. /tvb - Original Message - From: "Anders Wallin" To: "Discussion of precise time and frequency measurement" Sent: Thursday, January 23, 2014 3:31 AM Subject: Re: [time-nuts] PICPET- was Affordable (cheap) COTS (etc) > Given that Arduinos are now sold in (almost) every super-market, and the > programming IDE is free/open-source, and the C/C++ code is familiar to > many, I would have thought the logical evolution of the "pictic" is to > become an Arduino shield? > > One drawback (AFAIK) is that e.g. Arduino Due doesn't have a dedicated > counter/encoder input, like the dsPICs made for motor-control have. > On the other hand the Due has 12-bit analog inputs (and DACs) that might > work for interpolation. > > How fast can the QEI (quadrature encoder interface) on a dsPIC clocked at > 140MHz count? Were you planning on using a dsPIC with two QEIs, for TIC > start&stop coarse counting? > For 1ns or 2ns resolution an analog (or fpga?) interpolator is required > anyway? > > AW > > > On Thu, Jan 23, 2014 at 4:10 AM, Tom Van Baak (lab) > wrote: > >> Hi Bob, >> >> It's pretty easy to get a tiny PIC or AVR down to 50 ns, so to me the next >> sweet spot would be 1 or 2 ns. A couple of us are trying. Contact me >> off-list re the dsPIC33. >> >> /tvb (i5s) >> >> > On Jan 22, 2014, at 5:53 PM, Bob Stewart wrote: >> > >> > Tom, >> > >> > Do you know of any other PIC projects that get a greater resolution? I >> was thinking of doing something with a dsPIC33 running at 140MHz or >> greater, but I'm not sure I want to devote the time to if it's it's been >> done. >> > >> > Bob >> > >> > >> > >> > >> >> >> >> From: Tom Van Baak (lab) >> >> To: Robert Atkinson ; Discussion of precise >> time and frequency measurement >> >> Sent: Wednesday, January 22, 2014 7:39 PM >> >> Subject: Re: [time-nuts] Affordable (cheap) COTS / eBay kit for TIE / >> 1PPS phase comparison >> >> >> >> >> >> As much as I'm fond of my picPET it has 400 ns resolution and not >> intended to replace a 5 or 10 or 50 ns TIC (which is what the OP asked for). >> >> >> >> /tvb (i5s) >> > ___ >> > time-nuts mailing list -- time-nuts@febo.com >> > To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> > and follow the instructions there. >> ___ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Affordable (cheap) COTS / eBay kit for TIE / 1PPS phase comparison
Thanks for your suggestions so far everyone, The picPET would be a great solution if it could run at higher frequencies - but now there's a separate thread about that :) Magnus - my reference is a Brilliant Telecom (now Juniper Networks TCA series) PTP grandmaster (TCA8000), which does PTP and has E1/T1/BITS/frequency outputs. Internally it uses a Trimble Resolution T board for GPS/PPS. I think it could run Rubidium if I replaced the OCXO with a SpectraTime LPFRS. I'm familiar with Stable32 and I have a basic understanding of frequency stability / phase noise measurement concepts, but for the most part I will be simply looking at realtime phase offset measurement to test filtering and PI servo optimisations. Regards Wojciech ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Looking for Dual-Time "Atomic Clock"
Hi Dick, "They look very nice, but kind of big for my desktop !!" Not very clear about what message you were responding to... Didier On Wed, Jan 22, 2014 at 4:19 PM, Richard Solomon wrote: > They look very nice, but kind of big for my desktop !! > > Thanks anyway, > > 73, Dick, W1KSZ > > > > On 1/22/2014 12:37 PM, Bill Woodcock wrote: > >> All the ones we use are from BRG Precision Products: >> >> http://www.brgprecision.com/products/time_zone_displays/index.php >> >> Here's what it looks like on the wall: >> >> https://www.pch.net/dnssec/zrh >> >> -Bill >> >> >> >> >> >> >> ___ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/ >> mailman/listinfo/time-nuts >> and follow the instructions there. >> > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] PICPET- was Affordable (cheap) COTS (etc)
It seems that that the QEI on a dsPIC are internal hardware counters decoding the A/B phases of optical encoders: are you sure that they can be used like a time interval counter? Better to use the timer capture dedicated input. On Thu, Jan 23, 2014 at 12:31 PM, Anders Wallin wrote: > Given that Arduinos are now sold in (almost) every super-market, and the > programming IDE is free/open-source, and the C/C++ code is familiar to > many, I would have thought the logical evolution of the "pictic" is to > become an Arduino shield? > > One drawback (AFAIK) is that e.g. Arduino Due doesn't have a dedicated > counter/encoder input, like the dsPICs made for motor-control have. > On the other hand the Due has 12-bit analog inputs (and DACs) that might > work for interpolation. > > How fast can the QEI (quadrature encoder interface) on a dsPIC clocked at > 140MHz count? Were you planning on using a dsPIC with two QEIs, for TIC > start&stop coarse counting? > For 1ns or 2ns resolution an analog (or fpga?) interpolator is required > anyway? > > AW > > > On Thu, Jan 23, 2014 at 4:10 AM, Tom Van Baak (lab) > wrote: > >> Hi Bob, >> >> It's pretty easy to get a tiny PIC or AVR down to 50 ns, so to me the next >> sweet spot would be 1 or 2 ns. A couple of us are trying. Contact me >> off-list re the dsPIC33. >> >> /tvb (i5s) >> >> > On Jan 22, 2014, at 5:53 PM, Bob Stewart wrote: >> > >> > Tom, >> > >> > Do you know of any other PIC projects that get a greater resolution? I >> was thinking of doing something with a dsPIC33 running at 140MHz or >> greater, but I'm not sure I want to devote the time to if it's it's been >> done. >> > >> > Bob >> > >> > >> > >> > >> >> >> >> From: Tom Van Baak (lab) >> >> To: Robert Atkinson ; Discussion of precise >> time and frequency measurement >> >> Sent: Wednesday, January 22, 2014 7:39 PM >> >> Subject: Re: [time-nuts] Affordable (cheap) COTS / eBay kit for TIE / >> 1PPS phase comparison >> >> >> >> >> >> As much as I'm fond of my picPET it has 400 ns resolution and not >> intended to replace a 5 or 10 or 50 ns TIC (which is what the OP asked for). >> >> >> >> /tvb (i5s) >> > ___ >> > time-nuts mailing list -- time-nuts@febo.com >> > To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> > and follow the instructions there. >> ___ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Examples of leap-seconds in local timezones
Magnus, I have little experience with radio-based public time dissemination services, but some with GPS/NTP/PTP, so here's some info - hope it's of some value to you. For US and European exchanges, the leap second time happens outside trading hours, so maybe that's why we've heard little (horror) stories. This is definitely not an easy thing to deal with during trading, unless your messaging protocol actually has specific leap second extensions - which I'm not aware of any of the ones I know having. This is how the Linux kernel running UTC does it (assuming it's been told by NTP/PTP/GPS/user and the respective leap second kernel flag was set - and for example, a broken IRIG-B box somewhere hadn't forgotten to tell some of your NTP servers about this and your quorum blocked it): - If we're removing a second, Linux system clock will change from 23:59:58.9 straight to 00:00:00.0 - If we're inserting a second, Linux system clock will run the last second second twice: 23:59:59.9 will change again to 23:59:59.0 (that's the kernel internal / UTC time, time formatting functions will output the :60 value at insertion time). This approach can potentially be problematic for some applications, especially the insertion, which is essentially a step backwards, so some institutions / vendors propose an alternative approach, which is the leap second smear - I think Google was advocating that one: this is where you gradually add/take the extra time throughout the whole leap second day (which would be an approx. 11.6 ppm offset if you started from midnight - so you'd have to model this carefully to bring it back to normal soon after the leap second midnight). Those alternative methods of time insertion may be fine if they're used only internally within an organisation that doesn't provide timestamped data to other organisations, without also providing time services to them - or basically, all is well as long as interconnected parties use the same method of dealing with this. *personal opinion* While the leap second is a somewhat inconvenient phenomenon, while it's still there, it's there and we have to deal with it. I think that most of the problems around it that people talk about are a little bit of FUD resulting purely from the lack of adequate testing. This is based on my experience with computer/network kit - this wasn't meant to be an absolute statement. I'd say let the IERS keep computing it but let's drop it from UTC and let's do a one-off leap hour in some 4,000 years :-) Regards Wojciech ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Help for general GPIB problem
Try to stop the HPIB driver... maybe the driver is reporting as available even if no hardware is actually connected. On Thu, Jan 23, 2014 at 12:22 PM, Ulrich Bangert wrote: > Gentlemen, > > I am just going to improve my EZGPIB utility so that it can make use of more > than one GPIB-interface (supported by GPIB32.Dll, not Prologix). I have been > trying to enumerate all detected interfaces by using > > ibdev(bi,0,0,T300ms,0,1) > > in a loop where bi starts with "0" and is incremented by "1" until the > result of the call gets negative. Much to my surprise this loop detects 4 > (!) interfaces GPIB0 to GPIB3 even if absolutely NO interface is connected > to the pc. > > What am I doing wrong. Is "4" the maximum number of interfaces that may be > handled by GPIB32.Dll > > What do I need to do to find the real number of detected interfaces ? > > Best regards and TIA for your answers > > Ulrich Bangert > www.ulrich-bangert.de > Ortholzer Weg 1 > 27243 Gross Ippener > > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Examples of leap-seconds in local timezones
Magnus, (Going from memory here...) I seem to remember that NPL in UK used to add 0.1 second to each of the first 10 seconds after the hour. If this wrong, I hope someone picks up on it! Cheers Rob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Magnus Danielson Sent: 22 January 2014 19:53 To: time-nuts@febo.com Subject: [time-nuts] Examples of leap-seconds in local timezones Fellow time-nuts, In a discussion it again re-occurred that we needed examples of how leap-seconds is indeed is inserted into the local timezones at the UTC midnight. I think I recall that the Tokyo stock exchange was closed during the leap-second for instance. Stuff like that. Cheers, Magnus ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] PICPET- was Affordable (cheap) COTS (etc)
Given that Arduinos are now sold in (almost) every super-market, and the programming IDE is free/open-source, and the C/C++ code is familiar to many, I would have thought the logical evolution of the "pictic" is to become an Arduino shield? One drawback (AFAIK) is that e.g. Arduino Due doesn't have a dedicated counter/encoder input, like the dsPICs made for motor-control have. On the other hand the Due has 12-bit analog inputs (and DACs) that might work for interpolation. How fast can the QEI (quadrature encoder interface) on a dsPIC clocked at 140MHz count? Were you planning on using a dsPIC with two QEIs, for TIC start&stop coarse counting? For 1ns or 2ns resolution an analog (or fpga?) interpolator is required anyway? AW On Thu, Jan 23, 2014 at 4:10 AM, Tom Van Baak (lab) wrote: > Hi Bob, > > It's pretty easy to get a tiny PIC or AVR down to 50 ns, so to me the next > sweet spot would be 1 or 2 ns. A couple of us are trying. Contact me > off-list re the dsPIC33. > > /tvb (i5s) > > > On Jan 22, 2014, at 5:53 PM, Bob Stewart wrote: > > > > Tom, > > > > Do you know of any other PIC projects that get a greater resolution? I > was thinking of doing something with a dsPIC33 running at 140MHz or > greater, but I'm not sure I want to devote the time to if it's it's been > done. > > > > Bob > > > > > > > > > >> > >> From: Tom Van Baak (lab) > >> To: Robert Atkinson ; Discussion of precise > time and frequency measurement > >> Sent: Wednesday, January 22, 2014 7:39 PM > >> Subject: Re: [time-nuts] Affordable (cheap) COTS / eBay kit for TIE / > 1PPS phase comparison > >> > >> > >> As much as I'm fond of my picPET it has 400 ns resolution and not > intended to replace a 5 or 10 or 50 ns TIC (which is what the OP asked for). > >> > >> /tvb (i5s) > > ___ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > ___ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] Help for general GPIB problem
Gentlemen, I am just going to improve my EZGPIB utility so that it can make use of more than one GPIB-interface (supported by GPIB32.Dll, not Prologix). I have been trying to enumerate all detected interfaces by using ibdev(bi,0,0,T300ms,0,1) in a loop where bi starts with "0" and is incremented by "1" until the result of the call gets negative. Much to my surprise this loop detects 4 (!) interfaces GPIB0 to GPIB3 even if absolutely NO interface is connected to the pc. What am I doing wrong. Is "4" the maximum number of interfaces that may be handled by GPIB32.Dll What do I need to do to find the real number of detected interfaces ? Best regards and TIA for your answers Ulrich Bangert www.ulrich-bangert.de Ortholzer Weg 1 27243 Gross Ippener ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
