[time-nuts] Power connectors continued
William H. Fite
omniryx at gmail.com
Thu Jun 22 19:22:27 EDT 2017
A good friend of mine, sadly of blessed memory, was a lead engineer for
Grumman on the comm systems of the lunar lander. He spoke of small
space-rated multi-pin connectors that cost upward of $500 each.
On Thursday, June 22, 2017, Arnold Tibus <arnold.tibus at gmx.de> wrote:
> I can second Magnus and want to throw in some more details.
> Cannon, Deutsch, Bendix, Souriau, Matrix, Amphenol, etc. etc. are (big)
> companies manufacturing all kind of connectors and are n o t connector
> type designations! Important are the type numbers of the manufacturer or
> higher level specification numbers.
> We used in the aircraft and spacecraft business naturally the military
> (MS-) numbers listed in the MIL-QPL (or eg. for Spacelab with GSFC spec.
> no). Most types of connectors are under these numbers available from
> different manufacturers, of course with different manufacturer in house
> part numbers. Attention: the 'same' connectors may be bought w/o the
> Mil.-spec. sheets with somewhat lesser quality. Important details are
> the max. mating number, the contact resistance (e.g. 20 mOhm) and the
> max. continuous current, max. Voltage, vibration resistance and
> reliability etc. Of course, this makes good connectors somewhat
> 'expensive'. Hirel and non-magnetic gold plated D- subminiture type
> connectors do survive e.g. the rocket launch phase (high vibrations),
> vacuum and low temperatures and are still used for space projects.
> The D-sub series of connectors was introduced by Cannon in 1952. They
> are still available as standard, hirel, and non-magnetic versions. The
> contacts were machined contacts forcrimping or soldering connection and
> made of massive copper with gold finish. (more see e.g.
> https://en.wikipedia.org/wiki/D-subminiature). Example for the standard
> 9 pin connector designation (crimp): DEMAM-9S and DEMAM-9P. Today are a
> big number of companies producing equivalent types. Cheap ones are
> equipped with contacts made of sheetmetal. Nobody should expect then the
> same spec. values as reliability, mating numbers, contact power rating etc.
> It is up to the designer of a product to be informed and select the
> right quality device for his product ...
> I hope I could enlight a bit the connector selection and nomenclature
> regards, 73
> Arnold, DK2WT
> Am 22.06.2017 um 21:10 schrieb Magnus Danielson:
> > Hi,
> > The second connect has been called "Cannon" and XLR, and is not
> > generally recogniced as XLR, which is the product range name.
> > Naming of the first connector as "Cannon" is at least for me and many
> > others confusing. This is a good example how vendor name for a
> > connector type is not a good thing. The first connector is a circular
> > MIL-STD connector (don't remember the correct notation), and this is a
> > product available from ITT Cannon as well as AMP.
> > Cheers,
> > Magnus
> > On 06/22/2017 08:42 PM, Mark Spencer wrote:
> >> Sorry if I have caused any un due confusion thru my perhaps incorrect
> >> use of the terms "cannon" and "XLR."
> >> The green connector with 4 separate female contacts is what I
> >> perhaps in correctly referred to as a "cannon" connector. The silver
> >> connector with 3 separate female contacts was what I perhaps
> >> incorrectly referred to as a "XLR" connector.
> >> Both were in use in my lab powering time nuts gear.
> >> Mark Spencer
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William H Fite, PhD
Statistical Analysis & Research Methods
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