[SI-LIST] Re: help me
- From: "Andrew Ingraham" <a.ingraham@xxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Fri, 3 Feb 2006 11:38:39 -0500
> after I have populated that 3 dsp I have checked between the 1Vpwr
> supply and gnd resistance is only 3 ohms
>
> my 1v pwr section is 20A design
"Only 3 ohms?" How much resistance did you expect to measure?
3 ohms would mean 0.33 A (if the resistance were linear), far less than the
power supply's 20 A. If you expected 10 A in normal operation, the
resistance should be 0.1 ohm (again, if it were linear) at 1 V.
Because IC components are nonlinear, how much resistance you measure
strongly depends on the ohmmeter's applied voltage. (Most ohmmeters don't
apply a voltage, so don't expect a fixed value from your meter.)
Regards,
Andy
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