"Ruud Broens"


http://www.universalimport.se/Mfr.pdf


** Meaningless.

.......... Phil


Who'd have thought a 1 W resistor could lead to such heated argument :-)
Where to get is off the screen.

Just measured some 156 56K 1% BC (Philips) metalfilm resistor values.
Result: Avg 55,86 K Max: 56,26 K Min 55,69 K average is 0,25 % off,
95% are within 0.6 %, all are within -0.6..+0.45 %


Since they are on a (much longer) roll, it's interesting to see the values
in sequence. It suggests a production process with upper and lower
trigger levels changing some production parameter , ie. values are
continuously measured and fed back into the manufacturing process,
hence some 'extreme' value on the roll will give a 'swing of values' into
the
other direction and vice versa, some kind of noisy oscillation around the
mean value. From this, it doesn't seem likely such a low cost product as
a resistor is scrutinized for possible 0.1 % values, a separate more
controllable
production process for those makes more sense.

It's just one batch, but measurements seem to bear out Phil's statements,
in this case



** Now that is " real data " and confirms my experience exactly.

The main production variable is imperfect consistency in the metal coating
applied to the ceramic tubes - it they were all perfectly identical, the
lathe that cuts the spiral in the surface would not need to measure each one
as it worked.

Thanks for those figures - Rudy.




.......... Phil