[R-390] Resistor Tolerances

[JAMES T BRANNIGAN]

There was an article in QST several months ago that was a real "eye-opener"
about stored resistors.

Jim


> Scott -
>
> I assume the resistors used in R-390x's are carbon composition.  Moisture
> absorption alone will shift their tolerance up to about +-20%.
>
> When they were more commonly used (20 years ago), I occasionally had to
> educate customer incoming inspection departments claiming to have received
> "out of tolerance" product with the proper method for measuring the
> resistance value of carbon composition resistors.
>
> Among other requirements, before measuring resistance, they must be baked
> for a specific period of time at a specific temperature to eliminate
> absorbed moisture.
>
> - Greg