How to Use the Insulation Multimeter
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- Read all instructions and warnings that came with your insulation multimeter.
- Plug into the correct ports (1, 2) for insulation testing. This is easy to get wrong especially if you use the EL-50772 for standard DMM testing too. Do NOT use ports (3, 4) for insulation testing.
- Always test at the 500V range.
- With the test leads not connected to anything, press and hold test button to know how your meter displays an infinite measurement. The EL-50772 will display 550M Ω when measuring an open circuit while set to the 500V range.
- With the test leads connected together, press and hold test button to know how your meter displays continuity. The EL-50772 will display 0.0 Ω.
- When performing insulation testing you need a good ground reference. When possible use an alligator clamp to attach the ground lead. Typically, the reference point will be to vehicle chassis except cable testing which requires connection to the cable shield termination at the connector and not to the chassis.
- Verify your ground connection prior to every test measurement at a suitable ground location near your test point. The EL-50772 should display 0.0 Ω, indicating continuity.
- When testing components with large capacitance or inductance, such as certain modules and larger motor stators, it may be necessary to hold the test for a few seconds until the maximum resistance value is displayed.