[volt-nuts] Keithley triax cables, 6011 and 1506/1507

[Todd Micallef]

I have searched for the original part listed on my 181 cable ITT-Canon
CA3106B16-11P-A105 but never had any luck finding another to make a
shorting plug.

I did purchase a MS3106-E16-11P that fits it perfectly. The original
connector appears to be gold plated(?) and the MS connector is silver
plated. It is unknown which "copper alloy" is in the MS contacts.  I have
had other projects so I have not had time to determine how well the MS
connector compares to the original while shorted.

There is a Keithley 140 up for sale on the usual auction site. I cannot
find the manual for it, but maybe the seller will be willing to part it
from the meter? It has been listed for quite a while. It would be a matter
of the seller confirming the part number stamped on the edge of the
connector.

As for solder, Keithley recommends Sn/Ag4 solder for the 2182A connectors.
I am sure that discussion (low thermal solder) has been had here in another
thread.

On Sat, Nov 21, 2015 at 11:43 AM, Andrea Baldoni <erm191ba3 at ermione.com>
wrote:

> On Thu, Nov 19, 2015 at 10:38:40AM -0600, Russ Ramirez wrote:
>
> > Andrea, I can comment on the Triax cabling in that the Pomona and others
> > you see on ebay are not compatible for the Keithley units generally. I
> have
> > a 617 electrometer that I acquired from the designer of it, and he told
> me
> > that Keithley Sr made sure the triax design was unique; a Keithley
> designed
> > 3-lug Triax BNC design. Then as you already are aware, there is the
>
> Hello Russ.
> I am aware that there are also 3-lugs triaxial BNC, but my 617 has a
> 2-lugs one.
>
> Surely this is the original connector on the equipment; maybe you have
> a more recent revision of it?
>
> > Faraday Shield 'box' with alligator clip leads, attached to the Triax
> > chassis connector internally with solid wires (just used Cat-5 wire
> pieces)
> > so that outside EM would not add to the noise level on low current
> > measurements. That actually does make a huge difference and allow for
> > extremely low voltage and current measurements with greater certainty.
> This
> > instrument is a real pleasure to work with.
>
> When I will finally be able to test it, I will try your suggestion.
>
> By the way, no one knows anything about the connector for the 181
> nanovoltmeter
> and relative cables? While triax are already difficult to source, this one
> seems to be impossible.
>
> Best regards,
> Andrea Baldoni
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