[time-nuts] AC cord or connector for 5061A

[Robert Atkinson]

Mil-C-5015  approved as mains connectors, the main problem is that all pins disconnect at more or less the same time. Electrical safety dictates that the earth should disconnect last. I'd replace them with modern IEC  type connectors. If you don't want to ruin the originality of the unit, use a free (cord mounted) male connector. Put a compression type strain relief in the round hole left by the mil connector.

Robert G8RPI.

--- On Sun, 19/7/09, Arnold Tibus <Arnold.Tibus at gmx.de> wrote:

> From: Arnold Tibus <Arnold.Tibus at gmx.de>
> Subject: Re: [time-nuts] AC cord or connector for 5061A
> To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
> Date: Sunday, 19 July, 2009, 4:00 PM
> MS3106A-18-22SW ? 
> that special type of connector will be very hard to get 
> (if you do not find the original cable for this unit)!
> 
> The insert is not standard:
> "Not MSA/B insert arrangements and polarization"
> 
> This spec. is very old and even the US-Militaries did
> advice already
> decades of years ago to not use them anymore in new
> design.
> 
> One problem with this old MIL-Spec. connectors is that
> these contain
>  a lot of cadmium for protection against corrosion on their
> surface. 
> Cadmium is known to be very toxic and is today forbidden to
> be applied. 
> The cadmium is covered by a green chromate film, which is
> not very 
> resistant when the surface is being scratched with some
> force.
> 
> Technical details:
> It is a MIL-C-5015 Power type connector with large
> contacts, 
> threaded coupling, straight plug and shell size 18,
> But this contact arrangement18-22 is not on all
> manufacturers lists. 
> I guess that only some chinese manufacturer do still have
> them 
> in the productiong line for spares, if at all.
> 
> Attention to the 'W' in the type number which does mean
> that 
> the insert is turned by 70 deg. to avoid to be connected
> with std. 
> types used for other purposes...both mating part must have
> this marking!
> 
> some techn. infos under 
> http://www.in2connect.uk.com/c2/uploads/a5015%20ms1.pdf
> www.amphenol-aerospace.com/pdf/knowconnectors.pdf
> 
> I would propose in this case to exchange the original parts
> with 
> modern types fitting in this position and being qualified
> to be used 
> for mains connection.
> 
> Good luck!
> 
> regards
> Arnold
> 
> 
> On Sun, 19 Jul 2009 07:25:03 -0400, John Ackermann N8UR
> wrote:
> 
> >I got some from Digi-key a year or so ago. 
> Unfortunately, I don't 
> >recall the DK part number, but I recall I had to do a
> cross-reference 
> >from the Cannon part number to another manufacturer (I
> think AMP) and 
> >that's what DK had.
> 
> >John
> >----
> 
> >J. L. Trantham said the following on 07/18/2009 11:58
> PM:
> >> I am aware of the connection issue but I can't
> find the connectors.  Are
> >> they still available or should I change both the
> chassis connector and
> >> mating connector to something that I can find?
> >> 
> >> Thanks,
> >> 
> >> Joe
> >> 
> >> -----Original Message-----
> >> From: time-nuts-bounces at febo.com
> [mailto:time-nuts-bounces at febo.com]
> On
> >> Behalf Of Tom Van Baak
> >> Sent: Saturday, July 18, 2009 10:45 PM
> >> To: Discussion of precise time and frequency
> measurement
> >> Subject: Re: [time-nuts] AC cord or connector for
> 5061A
> >> 
> >> 
> >>> Does anyone know of a source for a power cord
> for the 5061A (or 5061B, 
> >>> 5065A, etc.)?  I am looking for 3 cords
> or the connector that mates 
> >>> with AC connector on the back.
> >>>
> >>> The AC Cord is HP part number 1251-2457 and
> the connector that mates 
> >>> with the connector on the back is a Cannon
> MS3106A-18-22SW.
> >>>
> >>> Thanks in advance.
> >>>
> >>> Joe
> >> 
> >> See if this helps.
> >> 
> >> http://www.leapsecond.com/museum/hp5065a/conn.htm
> >> 
> >> Best to open the bottom to make sure your unit has
> pins
> >> that match the schematic.
> >> 
> >> /tvb
> >> 
> >> 
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> 
> 
> 
> 
> 
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