On 10 December 2014 at 03:11, Dave Cole linuxcncro...@gmail.com wrote:
Did you check Ebay for Acopian power supplies in the UK?
I did, but there were none of the right spec.
300 pounds is not cheap but amortized over 25 years it seems a lot more
reasonable.
True, but a transformer and a
On 12/10/2014 4:51 AM, andy pugh wrote:
On 10 December 2014 at 03:11, Dave Cole linuxcncro...@gmail.com wrote:
Did you check Ebay for Acopian power supplies in the UK?
I did, but there were none of the right spec.
300 pounds is not cheap but amortized over 25 years it seems a lot more
On 3 December 2014 at 15:46, Dave Cole linuxcncro...@gmail.com wrote:
If you want a power supply that you can install, power up and have a
fair expectation of it lasting 25+ years I would go with an Acopian
linear power supply.
I have had a chat with them, and it looks like about £300 for a
On Tue, 9 Dec 2014, andy pugh wrote:
Date: Tue, 9 Dec 2014 18:46:19 +
From: andy pugh bodge...@gmail.com
Reply-To: Enhanced Machine Controller (EMC)
emc-users@lists.sourceforge.net
To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] MTBF
On 3
On 9 December 2014 at 19:18, Peter C. Wallace p...@mesanet.com wrote:
What about no cap? The time constant of the solenoid may be sufficient
to filter the 100 Hz ripple, and if not, a series inductor could be added
I measured the rise-time of the solenoid current at 25mS, so that
might
On 9 December 2014 at 19:49, andy pugh bodge...@gmail.com wrote:
On 9 December 2014 at 19:18, Peter C. Wallace p...@mesanet.com wrote:
What about no cap? The time constant of the solenoid may be sufficient
to filter the 100 Hz ripple,
It's an easy experiment.
It seems to work very well.
I
On 12/9/2014 1:46 PM, andy pugh wrote:
On 3 December 2014 at 15:46, Dave Cole linuxcncro...@gmail.com wrote:
If you want a power supply that you can install, power up and have a
fair expectation of it lasting 25+ years I would go with an Acopian
linear power supply.
I have had a chat with
On Sunday 07 December 2014 23:29:15 Dave Cole did opine
And Gene did reply:
On 12/5/2014 6:36 PM, Gene Heskett wrote:
On Friday 05 December 2014 11:03:36 andy pugh did opine
And Gene did reply:
On 4 December 2014 at 11:33, Gregg Eshelman g_ala...@yahoo.com
wrote:
I went back out to
On 12/5/2014 6:36 PM, Gene Heskett wrote:
On Friday 05 December 2014 11:03:36 andy pugh did opine
And Gene did reply:
On 4 December 2014 at 11:33, Gregg Eshelman g_ala...@yahoo.com wrote:
I went back out to the cabinets, counted slots and did a bit of
multiplication. I was staring at the
On 4 December 2014 at 11:33, Gregg Eshelman g_ala...@yahoo.com wrote:
I went back out to the cabinets, counted slots and did a bit of
multiplication. I was staring at the gutted remains of a one terabyte
RAID array. The first 500 gigabyte hard drives had just been introduced.
Amazing to think
On 12/04/2014 10:12 PM, dave wrote:
Ah! Nice to know that my memory is completely gone. ;-)
But, NO! What you said was quite correct. I don't know
about the capacity
of the drive, but it was a fixed-head single-platter disk
about 5 diameter.
My guess is it was a lot less than 250K bytes,
On Friday 05 December 2014 11:03:36 andy pugh did opine
And Gene did reply:
On 4 December 2014 at 11:33, Gregg Eshelman g_ala...@yahoo.com wrote:
I went back out to the cabinets, counted slots and did a bit of
multiplication. I was staring at the gutted remains of a one terabyte
RAID array.
Am 04.12.2014 05:52, schrieb Gregg Eshelman:
Then there's the American Billion 1,000,000,000
VS the Olde English Billion 1,000,000,000,000 or what we Yanks call a
Trillion.
Anyone in Europe know anyone still calling a Million a Milliard?
In Germany
a thousand Millions are a Milliard (10 to
Am 04.12.2014 04:02, schrieb Jon Elson:
/snip
Yes, of course, various manufacturers test all sorts of
stuff! But, these PUBLISHED
MTBF numbers all seem to come from the old DESC scheme.
When they show
250K hours MTBF for a hard disk drive, you KNOW they are
using this methodology.
Anybody
Sorry, folks, I made a mistake: (This was because I rarely have to look
at my bank account figures)
a thousand Billions are a Billiard etc., of course.
These names for numbers are seldom used because there isn't so much
money, and other values are mostly noted in scientific notation.
Peter
Am
On 12/3/2014 2:03 PM, Evan Foss wrote:
Moisture is the death of a lot of stuff. Sometimes before it is even
assembled. A lot of parts now are packed at the factory with descant
so that they will stay dry. Failure to dry them before soldering can
cause the parts to break like popcorn.
One
On 12/4/2014 1:05 AM, Peter Blodow wrote:
At the company I was working for, I had a building management system
installed (don't want to mention the brand, sounded like Siemens) around
1980. The central processor unit contained a hard disk drive with a -
nowadays - ridiculous sounding capacity
IIRC one of the US ICBM's had something like a 250 Kb hard disk,
head/track; all in a rather sturdy
case about 5 in dia. But that was a few years ago to I can't attest to
the accuracy of my memory.
Dave
On 12/04/2014 12:05 AM, Peter Blodow wrote:
Am 04.12.2014 04:02, schrieb Jon Elson:
/snip
On 12/03/2014 10:52 PM, Gregg Eshelman wrote:
Anyone in Europe know anyone still calling a Million a
Milliard?
I think in German, a millionen is 10^6, and a milliarden is
10^9.
Jon
--
Download BIRT iHub F-Type - The
On 12/04/2014 02:05 AM, Peter Blodow wrote:
. The device was the size of a large drawer, weighing
about 50 kg, and ran continously without failure (and
without back up system) up until we switched it all off to
make room for a more modern system. The disk made it more
than 30 years
On 12/04/2014 08:07 AM, Jon Elson wrote:
On 12/04/2014 02:05 AM, Peter Blodow wrote:
. The device was the size of a large drawer, weighing
about 50 kg, and ran continously without failure (and
without back up system) up until we switched it all off to
make room for a more modern system. The
2014-12-04 18:04 GMT+02:00 Jon Elson el...@pico-systems.com:
On 12/03/2014 10:52 PM, Gregg Eshelman wrote:
Anyone in Europe know anyone still calling a Million a
Milliard?
I think in German, a millionen is 10^6, and a milliarden is
10^9.
In Latvian it also is million (10^6), milliard (10^9)
Am 04.12.2014 17:30, schrieb Viesturs Lācis:
2014-12-04 18:04 GMT+02:00 Jon Elson el...@pico-systems.com:
On 12/03/2014 10:52 PM, Gregg Eshelman wrote:
Anyone in Europe know anyone still calling a Million a
Milliard?
I think in German, a millionen is 10^6, and a milliarden is
10^9.
In
On 12/04/2014 09:55 AM, dave wrote:
IIRC one of the US ICBM's had something like a 250 Kb hard disk,
head/track; all in a rather sturdy
case about 5 in dia. But that was a few years ago to I can't attest to
the accuracy of my memory.
Yes, that would be the Minuteman computer, the Autonetics
On 12/04/2014 07:29 PM, Jon Elson wrote:
On 12/04/2014 09:55 AM, dave wrote:
IIRC one of the US ICBM's had something like a 250 Kb hard disk,
head/track; all in a rather sturdy
case about 5 in dia. But that was a few years ago to I can't attest to
the accuracy of my memory.
Yes, that would
Does anyone know how to interpret MTBF numbers?
http://docs-europe.electrocomponents.com/webdocs/0d17/0900766b80d17a55.pdf
Specifically. 1500 hours doesn't seem very long,
--
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto
It looks like over 1500 'millions of hours' of 'Mean Time Between
Failures'
Thanks
Rick
-- Original Message --
From: andy pugh bodge...@gmail.com
To: Enhanced Machine Controller (EMC)
emc-users@lists.sourceforge.net
Sent: 12/3/2014 7:20:32 AM
Subject: [Emc-users] MTBF
Does
On Wed, Dec 3, 2014 at 7:20 AM, andy pugh bodge...@gmail.com wrote:
Does anyone know how to interpret MTBF numbers?
http://docs-europe.electrocomponents.com/webdocs/0d17/0900766b80d17a55.pdf
Specifically. 1500 hours doesn't seem very long,
--
atp
If you can't fix it, you don't own it.
On 3 December 2014 at 12:27, Rick Lair r...@superiorroll.com wrote:
It looks like over 1500 'millions of hours' of 'Mean Time Between
Failures'
But that would be 170,000 years, which seems unlikely too.
Even 1500 x 1000 hours (170 years) seems unlikely.
--
atp
If you can't fix it, you
(EMC)
emc-users@lists.sourceforge.net
Sent: 12/3/2014 7:20:32 AM
Subject: [Emc-users] MTBF
Does anyone know how to interpret MTBF numbers?
http://docs-europe.electrocomponents.com/webdocs/0d17/0900766b80d17a55.pdf
Specifically. 1500 hours doesn't seem very long,
--
atp
If you
On 3 December 2014 at 12:42, alex chiosso achio...@gmail.com wrote:
You're right Rick . ;-)
I still don't believe 1,500 x million hours.
I suppose it could be a Euro-style decimal separator, and therefore
1.5 million hours, but that is still 171 years MTBF.
(which would be ideal, but seems
http://en.wikipedia.org/wiki/Mean_time_between_failures
On 12/3/2014 6:45 AM, andy pugh wrote:
On 3 December 2014 at 12:42, alex chiosso achio...@gmail.com wrote:
You're right Rick . ;-)
I still don't believe 1,500 x million hours.
I suppose it could be a Euro-style decimal separator, and
Searching for 'probability Mio' yields some interesting papers.
On Wed, Dec 3, 2014 at 6:45 AM, andy pugh bodge...@gmail.com wrote:
On 3 December 2014 at 12:42, alex chiosso achio...@gmail.com wrote:
You're right Rick . ;-)
I still don't believe 1,500 x million hours.
I suppose it could
On 3 December 2014 at 12:55, John Thornton bjt...@gmail.com wrote:
http://en.wikipedia.org/wiki/Mean_time_between_failures
I sort-of understand MTBF, what I don't understand are the units they
are quoting it in.
--
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto
On 3 December 2014 at 12:55, Stuart Stevenson stus...@gmail.com wrote:
Searching for 'probability Mio' yields some interesting papers.
It does, though very few related the subject at hand. (If using the quotes)
--
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto
http://www.proz.com/kudoz/german_to_english/business_commerce_general/1072093-mio.html
tells us it is Million hours.
Interestingly, though, the term does not appear in BS EN 61709:2011 Electric
components - Reliability - Reference conditions for failure rates and stress
models for conversion.
Andy
MTBF is obtained by testing a number of units over a period of time at
accelerated environmental conditions. First the infant mortality of a
product is determined and then the MTBF is deduced. Some suppliers have
an MTBF based on the number of products produced compared to the number
of
Normally it is quoted in hours of service.
On 2014-12-03 15:11, andy pugh wrote:
On 3 December 2014 at 12:55, John Thornton bjt...@gmail.com wrote:
http://en.wikipedia.org/wiki/Mean_time_between_failures
I sort-of understand MTBF, what I don't understand are the units they
are quoting it in.
On 3 December 2014 at 13:38, Marcus Bowman
marcus.bow...@visible.eclipse.co.uk wrote:
I don't believe 1500 Million hours. It is, in any case, a calculated value
(not that there's anything wrong with that). If the unit contains large
capacitors, 1500 hours is a much more realistic figure.
So they tested a batch of parts and projected out to the point where 63
percent will have failed using some assumed distribution of failure times.
Not hard to get to 171 years using that methodology. It ignores the common
case where there is a mode of failure that causes the failures to be
On 12/3/2014 9:27 AM, andy pugh wrote:
On 3 December 2014 at 13:38, Marcus Bowman
marcus.bow...@visible.eclipse.co.uk wrote:
I don't believe 1500 Million hours. It is, in any case, a calculated value
(not that there's anything wrong with that). If the unit contains large
capacitors, 1500
On 12/03/2014 07:38 AM, Marcus Bowman wrote:
http://www.proz.com/kudoz/german_to_english/business_commerce_general/1072093-mio.html
tells us it is Million hours.
Interestingly, though, the term does not appear in BS EN 61709:2011 Electric
components - Reliability - Reference conditions for
On 12/03/2014 07:40 AM, Marius Liebenberg wrote:
Andy
MTBF is obtained by testing a number of units over a period of time at
accelerated environmental conditions.
MTBF CAN be evaluated this way, and it is a more truthful
way to do it, but it requires a LOT
of units and long testing on hi-rel
While I agree with that rant I can say that a lot of higher end stuff
does get environmental testing. My stuff lives in a hotter than
average environment and so I have to consider this.
Also my father has worked for a few different companies that for
defense and enterprise level hardware had to
On 3 December 2014 at 15:46, Dave Cole linuxcncro...@gmail.com wrote:
I believe the super reliable Acopians are the Gold Box units. But you
should contact them and ask them what is their most reliable power
supply design these days.
http://www.acopian.com/
In the UK the best source might
On 12/03/2014 11:39 AM, Evan Foss wrote:
While I agree with that rant I can say that a lot of higher end stuff
does get environmental testing. My stuff lives in a hotter than
average environment and so I have to consider this.
Also my father has worked for a few different companies that for
On 12/3/2014 7:31 AM, Steve Stallings wrote:
Traco appears to be a company whose main offices
are located in German speaking areas.
Mio is used as an abbreviation for Million, especially
in German.
The document that you linked seems to use a mixture
of . and , as the symbol for the decimal
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