Page 8 - February 2023 Track N Times
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TECHNICAL TRAINING
Ring It Out Continued
3) Once you have the meter leads connected, begin by rotating the crank on the side of the meter until the green LED illumi-
nates on the upper left corner of the meter panel. This indicates the desired test voltage has been reached. Keep cranking the
meter for at least 15 seconds and note the meter reading. Typically, a reading of 1.0 Megaohm per 100 volts is a sufficient
value. For 480V circuits a reading of 4.8 Megaohms is okay. Note: readings will vary with humidity. Higher humidity levels will
result in lower insulation readings. Take note of any readings that are low. Motors that are “shorted” or show a very low insula-
tion value should be replaced. Bus cables and other wiring that give very low insulation values should be inspected for
cracked or worn insulation. Damaged cables should be repaired or replaced.
In summary, continuity and resistance/insulation testing is a useful method for troubleshooting a variety of problems
in electrical circuits. Take the time to study the user manual of the Fluke Multimeter and the AEMC 6503 Megohmme-
ter. They are availble at the respective company’s websites.
If you have questions contact us at the tech department. We are always here to help.
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VOLUME 4 : ISSUE 1
