Like your car’s oil can wear out over time and become less effective at properly lubricating the engine, tester components can deviate from their original behavior. Part of the process of designing an accurate tester is determining what the appropriate calibration interval should be. Fluke reviews specifications as well as looking at real world experience with the thousands of testers in use. As with any electronic, resistors, capacitors and circuits can drift over time due to temperature, humidity and warming up and cooling down every time you turn your tester on and off. The circuit boards within the tester can also be contaminated by dust or other materials.
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