18-03-2013, 11:11 AM
Tak til Hannover, for endnu et bidrag til ”Making order out of chaos” 
COSC er et af emnerne, der ofte diskuteres (iltert) på ur fora, og hvor vandene deles mellem, at det er en god og betryggende kvalitetstest,
Overfor holdningen, at moderne urproduktions værktøjer er så nøjagtige, at testen kan bestås af næsten et hvilket som helst (mekanisk) ur.
Til trods for at kritikere af COSC, i vid udstrækning har ret i, at certificeringen er et PR gimmick, har jeg dog en overvejende positiv opfattelse.
I forlængelse af kronometer certifikatets evidente reklameværdi, ligger også muligheden for ”back lash”.
Tænk hvis det på et internationalt forum kunne skrives: ”Urmærke X sendte 500 værker til certificering, og 200 dumpede”.
Der er næppe noget firma, der ville løbe denne risiko.
Derfor er COSC både en forsikring om, at værket kan opfylde nogle (efterhånden let opnåelige) præcisionskrav….
… men er også en garanti for, at fabrikken har været særlig omhyggelig med værkerne, kontrollerede og evt. opgraderede med bedre dele.
Desuden bør det også tages i betragtning, at det kun er 3 % (ref: Wiki COSC ) af den schweiziske urproduktion, der er COSC certificerede.
Som Hannover anfører, foreligger der stadig lidt uklarhed om quartz urenes COSC.
Folk, der har den kætterske holdning, at et quartzur såmænd kan være et helt anstændigt ur,”bashes” ofte med udsagnet, at ethvert ”corn flakes” quartzur let opfylder COSC, og det er jo ganske korrekt.
Imidlertid foreligger fra 2003 industristandarden ISO 10553, der beskriver, ” the procedure for evaluating the accuracy of quartz watches, individually and by lot”
Lad mig citere en af TimeZone’s trofaste (og indsigtsfulde) ”quartzur’s fortalere”, ”Fatpants”, fra dette indlæg
From Controle Officiel Suisse des Chronometres...
"No international standard has so far been issued regarding electronic quartz watches.
Based on ISO 3159, the COSC has drawn up a set of testing prescriptions applicable to quartz chronometers which govern their performances in the same way as for mechanical chronometers.
Taking account of the specific technological characteristics of these products, the COSC has adapted the tests and precision requirements.
This called for the development of special quartz movements in order to meet these new requirements.
It has become compulsory for them to be equipped with an electronic system compensating for the variation in the frequency of the quartz according to changes in temperature.
New-generation quartz chronometer is therefore 10 times more accurate than a conventional quartz watch. Moreover it is a very exclusive product manufactured on a low scale.
Each quartz chronometer is tested for 11 days, in one position and at 3 temperatures...In addition, throughout an entire day, it is subjected to 3-dimensional rotations causing it to repeatedly assume all spatial positions.
Finally, it is subjected to 200 shocks equivalent to 100 G (100 times stronger than gravity).
Based on these measurements, 8 eliminatory criteria are calculated.
If and only if these 8 criteria are met, the movement is duly "chronometer-certified"."
A mechanical chronometer must be accurate to with +/- 5-6 seconds per day.
A quartz chronometer must have an Average daily rate (at 23 degrees Centigrade) of +/-0.7 seconds. This is an incredibly hard thing to achieve.
Thermo-compensation is the only way to get single digit accuracy results.
Only a handful of companies have put there watches through the Quartz procedure, although they are still not the most accurate around - Breitling's SuperQuartz is good for 15 seconds per year.
Furthermore, the certification has changed since the days of Omega's Marine Chronometer and Rolex's OysterQuartz (12 and 20 seconds per year, respectively) becoming much more tighter as the technology has progressed.
The original testing institute that issued the Chronometer certificates for the Omega 2400MC, was Besancon in France.
There is only one watch that is far more accurate than any COSC certified timepiece. Its Citizen's The Citizen.
Accuracy on this one is billed at +/- 5 seconds per year, but some owners have seen accuracy to 1 second per year. Astounding, isn't it.
All the best,
Fats;-)
Navnlig ”quartzurs haderne”, bedes venligst genlæse:
”New-generation quartz chronometer is therefore 10 times more accurate than a conventional quartz watch.
Moreover it is a very exclusive product manufactured on a low scale.”
… så lad os forenes i en fælles foragt for ”corn flakes quartzuret, eller tankstations quartzuret”, og rette opmærksomheden mod det langt mere udfordrende segment: HEQ quartzure.
For de af ”quartzurs haderne”, der tør udfordre deres fordomme om quartz, er der hjælp til at afmontere skyklapperne her: Watch talks forums, Horology 101, quartz F.A.Q
Nedenfor er til sammenligning COSC kravene til mekaniske ure, opstillet overfor ”de COSC lignende krav” til quartz kronometre.
Mekanisk COSC testkonfiguration.
Mekanisk COSC testkriterier
Quartz COSC testkonfiguration.
Quartz COSC testkriterier.
Sammenligning af Mek / Quartz COSC test.
Disclaimer:
Ofte kan det være hensigtsmæssigt, at udtrykke hvad der ikke har været meningen med et indlæg, så ”here goes”:
Dette er ikke et forsøg på at ”vride armen rundt på læseren”, for at han med djævelens vold og magt skal elske eller synes godt om quartzure.
Det er derimod et bidrag til forståelsen af, at der kan være legitime årsager til at interessere sig for denne teknologi.
Det er tilsvarende legitimt, ikke at ”tænde på” eller interessere sig for denne teknologi.
Derimod er det illegitimt, at udtale: ”Det er quartz, så er det uinteressant”
Med venlig hilsen - Geodoc
COSC er et af emnerne, der ofte diskuteres (iltert) på ur fora, og hvor vandene deles mellem, at det er en god og betryggende kvalitetstest,
Overfor holdningen, at moderne urproduktions værktøjer er så nøjagtige, at testen kan bestås af næsten et hvilket som helst (mekanisk) ur.
Til trods for at kritikere af COSC, i vid udstrækning har ret i, at certificeringen er et PR gimmick, har jeg dog en overvejende positiv opfattelse.
I forlængelse af kronometer certifikatets evidente reklameværdi, ligger også muligheden for ”back lash”.
Tænk hvis det på et internationalt forum kunne skrives: ”Urmærke X sendte 500 værker til certificering, og 200 dumpede”.
Der er næppe noget firma, der ville løbe denne risiko.
Derfor er COSC både en forsikring om, at værket kan opfylde nogle (efterhånden let opnåelige) præcisionskrav….
… men er også en garanti for, at fabrikken har været særlig omhyggelig med værkerne, kontrollerede og evt. opgraderede med bedre dele.
Desuden bør det også tages i betragtning, at det kun er 3 % (ref: Wiki COSC ) af den schweiziske urproduktion, der er COSC certificerede.
Som Hannover anfører, foreligger der stadig lidt uklarhed om quartz urenes COSC.
Folk, der har den kætterske holdning, at et quartzur såmænd kan være et helt anstændigt ur,”bashes” ofte med udsagnet, at ethvert ”corn flakes” quartzur let opfylder COSC, og det er jo ganske korrekt.
Imidlertid foreligger fra 2003 industristandarden ISO 10553, der beskriver, ” the procedure for evaluating the accuracy of quartz watches, individually and by lot”
Lad mig citere en af TimeZone’s trofaste (og indsigtsfulde) ”quartzur’s fortalere”, ”Fatpants”, fra dette indlæg
From Controle Officiel Suisse des Chronometres...
"No international standard has so far been issued regarding electronic quartz watches.
Based on ISO 3159, the COSC has drawn up a set of testing prescriptions applicable to quartz chronometers which govern their performances in the same way as for mechanical chronometers.
Taking account of the specific technological characteristics of these products, the COSC has adapted the tests and precision requirements.
This called for the development of special quartz movements in order to meet these new requirements.
It has become compulsory for them to be equipped with an electronic system compensating for the variation in the frequency of the quartz according to changes in temperature.
New-generation quartz chronometer is therefore 10 times more accurate than a conventional quartz watch. Moreover it is a very exclusive product manufactured on a low scale.
Each quartz chronometer is tested for 11 days, in one position and at 3 temperatures...In addition, throughout an entire day, it is subjected to 3-dimensional rotations causing it to repeatedly assume all spatial positions.
Finally, it is subjected to 200 shocks equivalent to 100 G (100 times stronger than gravity).
Based on these measurements, 8 eliminatory criteria are calculated.
If and only if these 8 criteria are met, the movement is duly "chronometer-certified"."
A mechanical chronometer must be accurate to with +/- 5-6 seconds per day.
A quartz chronometer must have an Average daily rate (at 23 degrees Centigrade) of +/-0.7 seconds. This is an incredibly hard thing to achieve.
Thermo-compensation is the only way to get single digit accuracy results.
Only a handful of companies have put there watches through the Quartz procedure, although they are still not the most accurate around - Breitling's SuperQuartz is good for 15 seconds per year.
Furthermore, the certification has changed since the days of Omega's Marine Chronometer and Rolex's OysterQuartz (12 and 20 seconds per year, respectively) becoming much more tighter as the technology has progressed.
The original testing institute that issued the Chronometer certificates for the Omega 2400MC, was Besancon in France.
There is only one watch that is far more accurate than any COSC certified timepiece. Its Citizen's The Citizen.
Accuracy on this one is billed at +/- 5 seconds per year, but some owners have seen accuracy to 1 second per year. Astounding, isn't it.
All the best,
Fats;-)
Navnlig ”quartzurs haderne”, bedes venligst genlæse:
”New-generation quartz chronometer is therefore 10 times more accurate than a conventional quartz watch.
Moreover it is a very exclusive product manufactured on a low scale.”
… så lad os forenes i en fælles foragt for ”corn flakes quartzuret, eller tankstations quartzuret”, og rette opmærksomheden mod det langt mere udfordrende segment: HEQ quartzure.
For de af ”quartzurs haderne”, der tør udfordre deres fordomme om quartz, er der hjælp til at afmontere skyklapperne her: Watch talks forums, Horology 101, quartz F.A.Q
Nedenfor er til sammenligning COSC kravene til mekaniske ure, opstillet overfor ”de COSC lignende krav” til quartz kronometre.
Mekanisk COSC testkonfiguration.
Mekanisk COSC testkriterier
Quartz COSC testkonfiguration.
Quartz COSC testkriterier.
Sammenligning af Mek / Quartz COSC test.
Disclaimer:
Ofte kan det være hensigtsmæssigt, at udtrykke hvad der ikke har været meningen med et indlæg, så ”here goes”:
Dette er ikke et forsøg på at ”vride armen rundt på læseren”, for at han med djævelens vold og magt skal elske eller synes godt om quartzure.
Det er derimod et bidrag til forståelsen af, at der kan være legitime årsager til at interessere sig for denne teknologi.
Det er tilsvarende legitimt, ikke at ”tænde på” eller interessere sig for denne teknologi.
Derimod er det illegitimt, at udtale: ”Det er quartz, så er det uinteressant”
Med venlig hilsen - Geodoc
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