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

[Brian Smith]

Keithley still makes this cable. It is a model 1507A. I believe  that the A
version is ROHS It is not a cheap cable.
The connector is an Amphenol.

On Sat, Nov 21, 2015 at 12:43 PM, Todd Micallef <tmicallef at gmail.com> wrote:

> 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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