>> >> Why all the resistor I buy (rated at 5% or more) then (once
>> >> measured with my ohmeter) prove to be even better than 1%,
>> in reality?
>> >
>> >Did you measure over the full temperature range, and after
>> (accelerated)
>> >ageing?
>>
>> Of course not. :D
>
> Then why are you surprised?

Metal film "5%" resistors from a reputable manufacturer will be well
within spec across full everything range. They just can't reasonably
dumb their process down enough to get out to 5%.

This makes the process of 'select on test" whereby you found a
resistor that suited your high accuracy needs by sorting through a bin
if eg 5% values. Such a method is questionable for various reasons but
nowadays it just doesn't;t work as the R's all cluster quite tightly
about their nominal values.


        RM

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