Re: [volt-nuts] Test Leads
Randy, Here is the Cal Lab standard solution but the most expensive: http://us.flukecal.com/secure-download?u=http%3A%2F%2Fdownload.flukecal.com%2Fsecure%2F54407002iseng0200.pdf%3Fnvb%3D20150721204511%26amp%3Bnva%3D20150721210011%26amp%3Btoken%3D0a3239567a669e8c502a5n=44512r=Literature The Keysight leads are made by Pomona: http://www.keysight.com/en/pd-100308%3Aepsg%3Apro-pn-11053A/low-thermal-emf-lug-to-lug-jumper-set?cc=USlc=eng Pomona banana plug: http://www.pomonaelectronics.com/pdf/d5291A_102.pdf You can find the Keysight or Pomona with combinations of spade-lug and banana plug. I like spade-lug for the reference end and banana plug for the 3458a side. These are my favorite everyday Cal leads: http://www.tequipment.net/Pomona5295.asp You can usually find these on eBay. Don't forget to get two sets for 4-wire ohms standards. Regards... Don -Original Message- From: volt-nuts [mailto:volt-nuts-boun...@febo.com] On Behalf Of Randy Evans Sent: Tuesday, July 21, 2015 11:33 AM To: volt-nuts@febo.com Subject: [volt-nuts] Test Leads I recently acquired a Fluke 752A to go with my Fluke 732A and HP-3458A. Now I need to address the need for low thermal test leads. Does anyone have any suggestions for test leads that have low thermal contributions to measurements? I have looked at Pomona 1756 Low Thermal EMF Cables as a starting point but haven't found any other candidates. I have heard that old TV twin lead works well since most are stranded copper wire. I have tried it between my 732A and 3458A and it seems to work fine but I would like to use more professional looking test leads, particularly with correct copper spade lugs (Pomona 2305 Low thermal EMF spade lug, Gold-plated?). Any other suggestions? Thanks, Randy Evans AE6YG ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
Re: [volt-nuts] Test Leads
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 randyevans2...@gmail.com To: volt-nuts@febo.com Sent: Tuesday, July 21, 2015 9:33 AM Subject: [volt-nuts] Test Leads I recently acquired a Fluke 752A to go with my Fluke 732A and HP-3458A. Now I need to address the need for low thermal test leads. Does anyone have any suggestions for test leads that have low thermal contributions to measurements? I have looked at Pomona 1756 Low Thermal EMF Cables as a starting point but haven't found any other candidates. I have heard that old TV twin lead works well since most are stranded copper wire. I have tried it between my 732A and 3458A and it seems to work fine but I would like to use more professional looking test leads, particularly with correct copper spade lugs (Pomona 2305 Low thermal EMF spade lug, Gold-plated?). Any other suggestions? Thanks, Randy Evans AE6YG ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
Re: [volt-nuts] Test Leads
On 21/07/2015 17:33, Randy Evans wrote: I recently acquired a Fluke 752A to go with my Fluke 732A and HP-3458A. Now I need to address the need for low thermal test leads. Does anyone have any suggestions for test leads that have low thermal contributions to measurements? I have looked at Pomona 1756 Low Thermal EMF Cables as a starting point but haven't found any other candidates. I have heard that old TV twin lead works well since most are stranded copper wire. I have tried it between my 732A and 3458A and it seems to work fine but I would like to use more professional looking test leads, particularly with correct copper spade lugs (Pomona 2305 Low thermal EMF spade lug, Gold-plated?). Any other suggestions? Thanks, Randy Evans AE6YG I am told NPL uses the van damme quad star cable, so try some and see how it works? ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
[volt-nuts] Test Leads
I recently acquired a Fluke 752A to go with my Fluke 732A and HP-3458A. Now I need to address the need for low thermal test leads. Does anyone have any suggestions for test leads that have low thermal contributions to measurements? I have looked at Pomona 1756 Low Thermal EMF Cables as a starting point but haven't found any other candidates. I have heard that old TV twin lead works well since most are stranded copper wire. I have tried it between my 732A and 3458A and it seems to work fine but I would like to use more professional looking test leads, particularly with correct copper spade lugs (Pomona 2305 Low thermal EMF spade lug, Gold-plated?). Any other suggestions? Thanks, Randy Evans AE6YG ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
Re: [volt-nuts] Test Leads
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 randyevans2...@gmail.com wrote: I recently acquired a Fluke 752A to go with my Fluke 732A and HP-3458A. Now I need to address the need for low thermal test leads. Does anyone have any suggestions for test leads that have low thermal contributions to measurements? I have looked at Pomona 1756 Low Thermal EMF Cables as a starting point but haven't found any other candidates. I have heard that old TV twin lead works well since most are stranded copper wire. I have tried it between my 732A and 3458A and it seems to work fine but I would like to use more professional looking test leads, particularly with correct copper spade lugs (Pomona 2305 Low thermal EMF spade lug, Gold-plated?). Any other suggestions? Thanks, Randy Evans AE6YG ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
Re: [volt-nuts] Test Leads
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). Gesendet: Dienstag, 21. Juli 2015 um 18:33 Uhr Von: Randy Evans randyevans2...@gmail.com An: volt-nuts@febo.com volt-nuts@febo.com Betreff: [volt-nuts] Test Leads I recently acquired a Fluke 752A to go with my Fluke 732A and HP-3458A. Now I need to address the need for low thermal test leads. Does anyone have any suggestions for test leads that have low thermal contributions to measurements? I have looked at Pomona 1756 Low Thermal EMF Cables as a starting point but haven't found any other candidates. I have heard that old TV twin lead works well since most are stranded copper wire. I have tried it between my 732A and 3458A and it seems to work fine but I would like to use more professional looking test leads, particularly with correct copper spade lugs (Pomona 2305 Low thermal EMF spade lug, Gold-plated?). Any other suggestions? Thanks, Randy Evans AE6YG ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there. ___ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
