Re: small, very accurate shunt resistors?
- From: "Jonathan Westhues" <google-for-my-name@xxxxxxxxxx>
- Date: Sun, 24 Jul 2005 15:32:11 -0400
"Michael Noone" <mnoone.uiuc.edu@xxxxxxxxx> wrote in message
news:Xns969D7578A68F0mnooneuiucedu127001@xxxxxxxxxxxxxxxxx
> Hi - I'm looking for some small (physically), very low resistance, very
> accurate resistors to use as shunts for current sensing. Ideally I'd like
> something like a .05 ohm resistor in a 0805 package with maybe .1% or
> better accuracy. I've been able to find plenty of larger resistors that
> match these specs, and among 0805s I've been able to find ones of the
> right
> resistance but that are less accurate (lots of 1% parts), and I've found
> many that are the right accuracy but not the right resistance (normally
> 10-
> 100 ohms is the smallest I can find among the .1 and .05% parts).
An 0.1% 50 milliohm resistor must be accurate to within 0.05 milliohms. If
you really need that kind of accuracy, then I think that trace resistance
will be a catastrophic problem. Is your circuit designed for a Kelvin
(four-wire) connection? I have very little knowledge in this area, but I am
sure that it would be necessary and I doubt that it would be sufficient.
Also, you implied in a previous posting that you were trying to use a
smaller current sense resistor so that your circuit would produce 0 to 2.048
volts instead of 0 to 4.096 volts. Clearly there is more to your circuit
than just the resistor; perhaps if you posted that then someone with
experience in this area could help you.
Jonathan
.
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- From: Michael Noone
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