New topics, ideas, reviews for the video blog > New topics, ideas, reviews for the video blog
T4D #14 - DMM Ref Check giveaway, Lascar Graphic Panel Meter...and more news..
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Tooms:
http://www.youtube.com/watch?v=HBWibhYqx3c&feature=plcp
Tooms:
Hi
you can also build your own power shunt, i have just done this http://www.tooms.dk/Tblog/Showblog1.asp?BlogID=201205271840516179
I found some very good resistors on ebay and then mount then on an heat shink.
Thomas
Fennec:
If you have a high quality Ohm range meter, you can use simple a piece of copper, like electric installation cable.
http://en.wikipedia.org/wiki/Electrical_resistivity_and_conductivity
And it's pretty easy to calculate.
Maybe you want measure 40A in a mV range.
length = (resistance * profile) / resistivity
(0,001 Ohm * 1,5mm2) / 0,0175 Ohm = 8,57 cm
0,001Ω * 40A = 40mV
If you need a higher range, make it longer or use Aluminium, Steel, Constantan or something like that. The most effort is the adjustment.
And you don't need such a big heat sink. For sure, don't forget the thickness, the demand ot the profile and the temperature coefficient.
MJLorton:
--- Quote from: Tooms on July 01, 2012, 02:56:24 AM ---
Hi
you can also build your own power shunt, i have just done this http://www.tooms.dk/Tblog/Showblog1.asp?BlogID=201205271840516179
I found some very good resistors on ebay and then mount then on an heat shink.
Thomas
--- End quote ---
Great project Thomas, thanks for posting. You have far too many "toys"! ;-)
I'll contact you about LAN access to the 8846A as soon as time allows.
Cheers,
Martin.
Tooms:
Hi
yes it is an nice shunt and i have already used it an number of times
Just let know if i can help with the LAN access on the 8846A but i dont understand why it is not working on yours.
Maybe a phone call to fluke support can be an good idea so they can tell what is wrong and make sure that there is not anything wrong with the meter.
Thomas
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