380363-en-GB_V-3.2 12/15
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Introduction
Congratulations on your purchase of Extech’s Insulation Tester/Megohmmeter. The Model 380363
provides three test ranges plus continuity and AC/DC voltage measurement. Manual datalogging
stores up to 9 data sets. This professional meter, with proper care, will provide years of reliable
service.
Safety
1. Circuits under test must be de-energized and isolated before connections are made (except for
voltage measurements).
2. Circuit connections must not be touched during a test. Use extreme caution when working near
bare conductors and bus bars. Accidental contact with conductors could result in electrical
shock.
3. Use caution when working near voltages above 60VDC or 30VACrms.
4. After insulation tests, capacitors must be discharged.
5. Test leads (including alligator clips) must be in good working order, clean and without broken
or cracked insulation.
6. When servicing, use only specified replacement parts.
International Safety Symbols
Caution, refer to this manual before using this meter
Dangerous Voltages
Meter is protected throughout by double or reinforced insulation
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