Hello all,

This is an electronic question, it is related to a security panel and the
End Of Line Resistor. For those that do not know the EOLR is a resistor
that in placed within the protected loop to provide a small amount of
current to flow and thus supervises the loop. If the loop is cut it is an
alarm, if the loop is shorted it could be an alarm or trouble depending upon
the status of the panel. Enough background.

Today I had a strange occurrence with a EOLR. The system was not reporting
the zone open even though I was holding the door open and looking at the
keypad. After a period of troubleshooting found that the 3.74k resistor was
now 5.86k. Replaced with new and all is well. This is the second time in 17
years that this has happened to me. Very Strange???
I wonder what would make it change in this way. Any thought???

Just looking for opinions on this. The environment was a clean office,
normal temps, humidity very comfortable. No signs of overheating of the
resistor, no corrosion present. All looked as it did when I installed about
4 years ago except for the very high value.

Thanks in advance.

Les