[SI-LIST] Re: DC resistance measurement
- From: "Taylor Jones" <taylor.jones@xxxxxxxxx>
- To: si-list <si-list@xxxxxxxxxxxxx>
- Date: Wed, 23 Aug 2006 12:42:23 -0700
On 8/22/06, Andrew Ingraham <a.ingraham@xxxxxxxx> wrote:
>
> Accurate DC resistance measurements sometimes require a "kelvin" or 4-lead
> connection ... two leads to pass current through the device, and two
> *separate* leads for measuring the resulting voltage drop. That way, I*R
> voltage drop across the connection points, leads, etc. is negated.
This brings up a term for which I was looking for more information, but
couldn't find anything. I have an AppNote that says:
The traces to and from the FET's source and the
VDDEXT supply pin on the Blackfin processor
should, if possible, be Kelvined to their power
supply to avoid transient effects on other devices
connected to the same supply.
What exactly does it mean to be "Kelvined" to their power supply?
~ Taylor
Regards,
> Andy
>
> > Now, we are measure DC resistance of power plane in PCB. The presision
> > should be 0.1 mohm at least. However, because of the clamp of the meter,
> > the error is about 1m ohm. In another word, the difference between two
> > measurement for the same DUT is about 1 mohm. Is there any advice about
> > this topic? Anything will be help. In your measurement, how to connect
> the
> > probe to the plane?
>
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