[time-nuts] Power connectors continued
arnold.tibus at gmx.de
Thu Jun 22 18:54:32 EDT 2017
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 point.
Am 22.06.2017 um 21:10 schrieb Magnus Danielson:
> 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.
> 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
>> mark at alignedsolutions.com
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