megohmmetern.
/mɛɡˈəʊmˌmiːtə/, U.S. /mɛɡˈoʊ(m)ˌmidər/ An ohmmeter calibrated in megohms, used chiefly for measuring the electrical resistance of insulation materials.
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the world > matter > physics > electromagnetic radiation > electricity > resistance > [noun] > unit of resistance > instrument for measuring
ohmmeter1884
megohmmeter1909
1909 Cent. Dict. Suppl. Megohmmeter, an instrument similar in type to an ohmmeter but suitable for the measurement of very high electric resistances.
1925 Science 6 Feb. 160/1 On display..meg-ohmmeter, precision ammeters and volt-meters, [etc.].
1969 Strain 5 221 (title) A megohmmeter for the measurement of the insulation resistance of ceramic installations for strain gauges.
2002 Electr. Constr. & Maintenance (Electronic ed.) 1 Dec. Time-saving tips include changing brushes, checking winding insulation with a megohmmeter, and machining commutators in place.
This is a new entry (OED Third Edition, March 2004; most recently modified version published online March 2022).
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