"Ian Iveson"


The question to which I can't find an answer is, do they chop off
the tails of the distribution? The only way that could be done would
be by measuring every resistor.

Looks like they do.



** Metal film and other spiralled resistors are made initially as fully
coated tubes of ceramic - then the film is cut into a spiral in an
automatic lathe to from the final value. The same coated blank tube can
make a range of values.

The lathe machine that does the spiral cutting MEASURES the value as it cuts
and STOPS when the pre-set value is reached. The accuracy and consistency
depends on the speed at which the machine is producing finished resistors.

Accuracy and consistency of within 1% is easy to achieve and so has became
the industry standard - and every resistor is measured.





.......... Phil