Re: 2K vs 2.2K - not a problem

["Dave" <google.3.trustme@xxxxxxxxxxxxxxx>]

It'll work just fine.  You guys are forgetting that a 2.2k resistor is
not 2.20000000 ohms.  There is a tolerance in every resistor, and it's
usually 5 to 10 percent, as indicated by a gold or silver band on the
resistor.

That means the 2.2k resistor that comes with the FBI panel is somewhere
between 2310 ohms and 2090 ohms, if it's a 5% resistor.  The 2.0k
resistor that comes with the Ademco panel is actually somewhere between
1900 and 2100 ohms.  See the overlap in values?  Add to that a loop
resistance of 100 ohms or so, and you can see this stuff is not all
that precise.

If you really want to know for sure, connect a potentiometer across the
zone terminals and see for yourself how high you can dial the pot
before the zone goes into trouble.  It's probably about 2800 ohms.  Not
a problem.

mikey wrote:
> I'm upgrading my old FBII panel to an Ademco. Ademco want 2K EOL and
my
> contacts all have 2.2K resistors in here. Is the Ademco panel going
to be
> okay with that? Seems close enough to me tolerance-wise but I'd feel
better
> if somebody's done it and all is well. I suppose I could 200R
resistors in
> the panel but yuck.
>
> Thanks