Still around of course:
Dave :)
Still around of course:
Dave :)
When I think back (as W. Neville Williams used to say), RS used to be in exactly the same position in the industry where Farnell is now. Then Farnell gradually became more and more popular while RS sort-of faded into the background. Probably the better catalog and component range had a lot to do with it, as you said.
Bob
I remember reading an article a few years back that listed the turnover for all the major electronics companies in Australia, and if I remember rightly RS had about 3 times the turnover of Farnell at the time. Anyone know who the current winner is?
I always reach for the Farnell catalog first, and only go to RS if Farnell don't have it, or I want to price match for a larger QTY.
Dave :)
all very relevant if I turned it to Ohms and measured R directly.
not so much use if I turn it to extremely low volts, and continue measuring current and voltage. I can measure my current to much better than 1%.... with a uVolt meter I can wind the current down, avoid self-heating problems and still get a great measurement.
?!
There isnt much of a correlation between inductance and resistance, unless the core fill factor remains constant. and even then I can still get widely varying R for the same L - eg using TIW instead of magnet wire gives much higher R for the same L, as TIW has much, much thicker insulation. ditto for using Litz
Im not using wire, and one of the things I dont know is the actual resistivity of the material, although I do know the geometry.
Cheers Terry
law.
4-wire (Kelvin) measurement.Cheers Terry
2c
law.
I expected you would, but there is still the connection (aka junction) resistance where you somehow make connection with the winding.
Well in theory it doesn't matter as long as the total measured current flows through the resistance under test, and the impedance of the voltmeter is high enough, and the voltmeter connection is positioned where you want the reading. ie not including current leads.
MrT.
2000 1000A.
problem
Which is what I said already, but doesn't address the calibration issue.
close
inductance is
And you don't know what wire you are using or what the meanufacturers spec for resitsance is? Would be a lot easier to find that out and measure the length, than to try to measure the resistance IMO.
know
That's
I see, (well not exactly since it's a bit vague), good luck then.
MrT.
Sort of. Even with a four-wire connection, you will need to ensure that the sensing connections are good.
Yes, if they are "bad" you might not get a reading at all :-)
(for the purpose of this limited discussion I will ignore things like thermally induced EMF's etc.)
MrT.
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