Randy,

I made my own version of the Fluke 5440A-7003 cables here ...

http://us.flukecal.com/products/accessories/test-leads-probes-and-clips/5440a-7003

I bought some Belden 8719 cable, blue Pomona patch cables (B-18-6), and
some gold-plated spade lugs from here http://jswilley.com/Accessories.html

The most expensive part was the crimping tool. If you have access to one ,
you can make some good quality cables for less than the low-thermal Pomona
cables. You can also make them to whatever length you need.

Todd

On Tue, Jul 21, 2015 at 12:33 PM, Randy Evans randyevans2688@gmail.com
wrote:

the best is really to use bare copper wires, such as used for wiring bells at home. does not look fancy, but low EMF.
Re. the low EMF Pomona cables with 4mm plugs, when you insert them in their (Pomona's) low EMF binding terminals, the spring that activates the safty protection pushes them out slowly, same with other binding posts, so not a safe connection if you are not carefull. Badly engineered imo.
I made my own cables with spades, using high quality gold plated pure copper spades and kapton twisted shielded cables, but again, bare copper is better (see guildline video on youtube re. their resistance bridges), but you will probably, if at all, only see that with a 34420A in lowest resolution (actually I have not).

On 21/07/2015 17:33, Randy Evans wrote:

I am told NPL uses the van damme quad star cable, so try some and see
how it works?

Randy:

From my own experiences and what I have done over the years about "low

thermal leads".

I have made my own leads from the Pomona #4892 double gold plated banana

plugs along with using Pomona #5406 single gold plated banana plugs, where I
needed to spread the leads futher apart than the standard 3/4 inch, such as
plugging into the Fluke 732A.  I have been using Belden #9272 shielded
twinax as my cable material only because it was available at the time to me.
It is a twisted pair of 20 ga. tin plated wires inside of a braided shield.
The purests will say that the tin plating will cause "Thermals" when screwed
down on the Gold plated banana plugs.  I realize that and I now have 100
feet ( 50 red, 50 black ) of Pomona #6733, which is extremely flexable
copper wire with Silicone double insulation.  I will then twist these
together and the put a shield braid over that and finally put a heat shrink
layer over the shield to make my own "copper twisted pair shielded" wire
which I will then attach to the #4892 or #5406 banana plugs to create a
"more perfect" low thermal test lead ( I hope ).  This is all when I get a
"round toit" of course.

In the meanwhile I have purchased 6 ea Pomona #1756-48 leads.  Frankly I

cannot measure a difference between the #1756 and the homemade leads, once I
wait about 3 minutes for all "Thermals" to settle down.  I also have 2 ea
Fluke P/N 738716 ( 24 inches ) and 1 ea Fluke #738724 twin shielded test
leads.  These are the Fluke 5440A-7002 Low Thermal test lead set that is
recommended by Fluke for use with 732A/B, 5440A/B and other high precision
calibrators.  They are RG-58 with Tellurium Copper conductors/ Beryllium
Copper Tip Springs.  Again I cannot see differences between all of these
cables with the best measuring equipment I have.  HP 3458A DVM and Fluke
845AB Null Detector and measuring between 732A/Bs, 5440B for nulls.

I am sure that Fluke has done extensive research on this subject.  It

may well be that measurements can be made faster using the "purest" approach
of pure copper and gold plated connectors.  I don't know at the present
time.

Hope this helps you in making up what you need.

Bill

----- Original Message -----
From: "Randy Evans" randyevans2688@gmail.com
To: volt-nuts@febo.com
Sent: Tuesday, July 21, 2015 9:33 AM
Subject: [volt-nuts] Test Leads

https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts