Author Topic: Cabeling PSU for "best" precision?  (Read 1349 times)

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Offline FriedMuleTopic starter

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Cabeling PSU for "best" precision?
« on: May 07, 2019, 02:16:19 am »
I have a DC PSU (max 15V 60A, 0.1mV 0.1mA resolution with 5½ display and with 5V sense lines.)

I know that shorter cables with bigger diameter is better but how much does matter, within reason?
My question is most if I can place the PSU on the top shelve and run the cables the 10 feet "long" way round or I shall place the PSU on bottom shelve, 2 feet right above the work table?

What thickness is best for the power/sense lines, shielded, twisted, more?

My goal is not to compete with NASA but I would like to know that what I send is what I end up delivering. :-)
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Offline FriedMuleTopic starter

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Re: Cabeling PSU for "best" precision?
« Reply #1 on: May 07, 2019, 03:05:41 am »
Great advice, and thanks for the math!


Before I did ask, I did think of making one cable with the sense (yes real s+ s- lines) but then I found out that a 60A maybe shall be about 4 awg, so wary thick or?

That gave me the idea to run them separate so I can use whatever I need in awg and the sense lines parallel.
I was thinking on using crocodile clamps.

After your answer, am I not sure that it is any good?
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Offline FriedMuleTopic starter

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Re: Cabeling PSU for "best" precision?
« Reply #2 on: May 07, 2019, 03:42:07 am »
Thanks again, cant seme to find anything about voltage drop, would you please take a look? http://www.maynuo.com/downloadfile/2009102937237341.pdf

4x cable, so 6 wires in total?
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Offline FriedMuleTopic starter

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Re: Cabeling PSU for "best" precision?
« Reply #3 on: May 07, 2019, 04:13:21 am »
yes my bad:-)
Ok thanks I'll ask!

Is 10 wires better then 4 (2 power + 2 sense) ?
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Offline FriedMuleTopic starter

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Re: Cabeling PSU for "best" precision?
« Reply #4 on: May 07, 2019, 04:32:03 am »
yes that makes sense! :-)

How would you terminate the cables, in alligator or?
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Offline FriedMuleTopic starter

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Re: Cabeling PSU for "best" precision?
« Reply #5 on: May 07, 2019, 05:17:56 am »
I am so happy that you help!

Yes if I need 60A we are talking about using different connectors, but I am thinking for powering generic DUT where there are no high amp input.
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Offline FriedMuleTopic starter

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Re: Cabeling PSU for "best" precision?
« Reply #6 on: May 07, 2019, 07:57:17 am »
I have got the following answer, that I do not understand.

The compensate voltage is 05V~1V. A higher voltage has a higher compensated voltage.
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Offline FriedMuleTopic starter

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Re: Cabeling PSU for "best" precision?
« Reply #7 on: May 07, 2019, 08:28:21 am »
The compensate voltage is 05V~1V. A higher voltage has a higher compensated voltage.

Even a native Chinese speakers can have a hard time understanding Chinglish.
LOL so I may have to ask again:-)
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