Infinite resistance (open circuit) is read as “OL” on the Fluke meter display, and means the resistance is greater than the meter can measure. Resistance measurements must be made with the circuit power off – otherwise, the meter or circuit could be damaged.

What does OL mean in resistance?

If the screen displays 1 or OL (open loop), there's no continuity—that is, there's no path for electric current to flow from one probe to the other.

Does Ol mean short circuit?

If your multimeter shows infinite ohms or OL, then that means the breaker could have deteriorated and tripped from a lower current flow. ... If the multimeter shows continuity, there is a short circuit. It could be caused by a faulty breaker, broken wire, or a faulty receptacle or switch.