Low Cost Dummy Load
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davemrtn
Yes but, as you can see from his photo, he paid for a 1% resistor !!
For $11 (+ shipping), I would be calling the vendor. OR MAYBE, the error is in the device he is using to measure the resistance ?? On 5/11/2015 2:05 PM, Wayne Dillon
wayne.dillon@... [4sqrp] wrote:
-- David Martin - K5DCM Mountain Home, Ar. -+-+-+-+-+-+-+-+-+-+- "It's only "work" if you'd rather be doing something else" - Dean Kamen
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John Lonigro
I could be wrong, but I don't think a 1% resistor necessarily
means the value is within +/- 1%. I think there are some
statistics involved which might say, for example, that the
standard deviation is 1%, meaning there are about 40% of the
resistors in a particular lot that would fall outside the 1% value
and a few percent even falling outside the 2% value.
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And, of course, David is right that the error (or at least some of the error) could be coming from the measuring device itself. As they say, if you have one clock, you know what time it is. If you have multiple clocks, you have no idea... 72, John AA0VE
On 05/11/2015 02:20 PM, David Martin
davemrtn@... [4sqrp] wrote:
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davemrtn
I am not saying it isn't, but I have never heard 'Resistor
Tolerance' related to standard deviations.
I am sure it's it used by the manufacturer to control their manufacturing process, but I think at lot of precision resistors (< 5% tolerance) manufactured these days use laser trimming to bring the parts to within rated tolerance. Maybe there is an engineer in our group that works for a resistor mfg that can give us the full skinny ?? On 5/11/2015 6:12 PM, 'John R. Lonigro'
jonigro@... [4sqrp] wrote:
-- David Martin - K5DCM Mountain Home, Ar. -+-+-+-+-+-+-+-+-+-+- "It's only "work" if you'd rather be doing something else" - Dean Kamen
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