Re: EOL's

[Robert L Bass <sales@xxxxxxxxxxxxxxxxxxxxx>]

It's too bad you didn't keep the resistor.  It might have been
interesting to examine it.  My best guess is it was poorly made
to start with (stuff happens) and it chose your installation in
which to make its home.  :^)

--

Regards,
Robert L Bass

Bass Burglar Alarms
The Online DIY Store
http://www.BassBurglarAlarms.com

--

Never underestimate the power of very stupid people in large
groups.

> Correct Robert, I don't remember the tolerance band on this particular
> resistor but I believe it to have been a 10% Silver.  That would mean it
> would have had a high range of 4.114k but it was at 5.86k that would be
> 56.7% increase in value.  We will never know what happened to have changed
> it so drastically.
>
>
> "Robert L Bass" <sales@xxxxxxxxxxxxxxxxxxxxx> wrote in message
> news:eb6ev1h97at7kufj9b3amplqddkrkuemuu@xxxxxxxxxx
> >> If you begin with a resistor with a 20% tolerance (no tolerance band),
> >> and with some age and heat, the carbon in it can change it's
> >> resistive/conductive properties...
> >
> > No Al.  That is not correct.  Tolerance is a measure of the
> > precision of the resistor in manufacturing.  It does not mean
> > that the resistor will change over time.
> >
> > Resistors are never made to the exact value indicated by the
> > color codes.  Manufacturers use the tolerance color band to tell
> > you just how accurately the resistor was made.  It is a
> > measurement of the imperfections.  Gold = within 5% of dead-on.
> > Silver = within 10%.  In other words, the tolerance band
> > indicates the range of possible values that a given resistor may
> > have.  For example, a resistor with three red bands and one gold
> > band is rated at 2200 Ohms but it can actually read anywhere from
> > 2090 to 2310 Ohms.  Whatever its value was when made, it will
> > remain at that same value permanently.
> >
> > To determine the exact range that the resistor may be, take the
> > value of the resistor and multiply it by 5%, 10%, or 20% for
> > gold, silver or no tolerance band, respectively.
> >
> >> If you really want to control this better, try either 10% tolerant
> >> resistors (silver tolerance band) or better yet 5% (gold tolerance
> >> band) resistors.
> >
> > The above statement is based upon a misunderstanding of resistor
> > tolerance.
> >
> > If you really want to be picky, use 5-band resistors but have fun
> > finding an alarm manufacturer that supplies them.  3-Band and
> > 5-band resistors do exist, though they're not appropriate for use
> > in alarm circuits.
> >
> > It is highly unlikely that the gentleman has a 20% tolerance
> > resistor but even if he did that would not mean that the carbon
> > is more likely to change value.
> >
> > --
> >
> > Regards,
> > Robert L Bass
> >
> > Bass Burglar Alarms
> > The Online DIY Store
> > http://www.BassBurglarAlarms.com
> >
> > --
> >
> > Never underestimate the power of very stupid people in large
> > groups.
>