What is standard leads length? - Page 1
Forum section: electronics / general

author: 001
author_rank: Super Contributor
timestamp: November 10, 2017, 04:56:55 pm
content: I'm gonna make my own bnc/bnc cable (based tasker rg58) and few banana wires(2sq.mm)What is standart length?

author: Mr. Scram
author_rank: Super Contributor
timestamp: November 10, 2017, 04:59:38 pm
content: Quote from: 001 on November 10, 2017, 04:56:55 pmDo you do any research before you post your questions?

author: tggzzz
author_rank: Super Contributor
timestamp: November 10, 2017, 05:02:31 pm
content: Quote from: 001 on November 10, 2017, 04:56:55 pmSeehere.

author: Neilm
author_rank: Super Contributor
timestamp: November 10, 2017, 05:08:03 pm
content: The standard length is slightly shorter than the length you need

author: Gyro
author_rank: Super Contributor
timestamp: November 10, 2017, 05:10:12 pm
content: The distance between the things you want to connect together plus or minus about 6 inches.You should probably store them in the Beginners or Test Equipment sections rather than the Metrology closet too, unless they are specifically low thermal emf.

author: David Hess
author_rank: Super Contributor
timestamp: November 10, 2017, 08:53:18 pm
content: I usually make my BNC patch cables in lengths of 1 or 2 nanoseconds so the physical length depends on the velocity factor of the coaxial cable.

author: Mjolinor
author_rank: Frequent Contributor
timestamp: November 10, 2017, 09:16:10 pm
content: Quote from: David Hess on November 10, 2017, 08:53:18 pmExcellent.

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: November 10, 2017, 09:48:06 pm
content: Hi,Interesting idea from David to determine the length by the electrical delay.In my lab I make my own cables. I have two favourite lengths, 2ft (60cm) and 4ft (120cm). But this is to suit my bench. I use the short cables for equipment on the bench. The longer cables are for equipment on the shelves above the bench or equipment on my scope cart.There two kind of RG58 cable. You want the kind with a stranded center conductor for test leads.I mark the ends with colored heatshrink tubing or colored strain reliefs.Regards,Jay_Diddy_B

author: beanflying
author_rank: Super Contributor
timestamp: November 11, 2017, 05:29:23 am
content: Quote from: Neilm on November 10, 2017, 05:08:03 pmI have always found my leads come up short. Want to share some of your spare?Surely the speed of light squared - the resistance of the flux capacitor should determine the length of any lead.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: November 11, 2017, 06:28:00 am
content: Quote from: David Hess on November 10, 2017, 08:53:18 pmI use air.

author: David Hess
author_rank: Super Contributor
timestamp: November 13, 2017, 04:47:41 am
content: That GR874 10cm air line is uniquely useful for several applications; it can serve as a high precision 50 ohm impedance reference and a short low loss delay for sampling measurement of tunnel diode and avalanche pulse generators which otherwise may suffer from false triggering. I do not have one yet and I am not sure what the modern equivalent is.I like RG-400 for patch cables because it lasts longer and is more reliable; the double shielding makes the ends tough and the Teflon insulation is resistant to contamination. It comes out to 16.5 inches for 2 nanoseconds and 41.1 inches for 5 nanoseconds. A typical 100 MHz oscilloscope with a sweep of 5ns/div can easily resolve 1 nanosecond of timing difference.RG-174 (or RG-316 which is the Teflon version) make for very easy to use coaxial patch cables for less critical applications.