Extech Instruments MG310 User Manual page 2

Introduction
Thank you for selecting the MG310 Insulation Resistance Tester. This meter measures insulation
resistance, continuity, and AC Voltage. The MG310 is CAT III 600V AC and ideal for measuring
insulating materials and electrical equipment such as transformers, cables, switches, and
appliances. Applications include maintenance, testing, and inspection. Proper use and care of this
meter will provide many years of reliable service.
Safety
This tester is designed and manufactured in compliance with the IEC61010 standard. This user
manual includes detailed information related to the safe operation and care of this instrument.
Please read carefully before using the instrument.

Please read and understand this user manual before using the device.

Always use the device as specified in the user manual, retain the manual for future use and
check the www.extech.com website for newer versions of the user manual.

Misuse of this device may cause personal injury and damage to the instrument and
connected equipment.

This symbol on the instrument indicates that for safe operation the user must use the
instrument as described in the user manual.

Danger icons: Alert to conditions and actions that may cause serious or fatal injury.
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Warning icons: Alert the user to the potential of electric shock.
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Caution icons: Alert to conditions and actions that may cause damage to the instrument or
that may affect the instrument accuracy.
Danger

Do not measure circuits with voltages greater than 750V AC.

Do not use this instrument in areas where flammable conditions exist.

Do not use this instrument in areas of high humidity. Do not operate this instrument with
wet hands.

Do not touch conductive sections of the test leads when taking measurements.

When test leads are shorted and connected to the instruments do not press the TEST button.

Do not open the battery cover during tests.

Do not touch the tested circuits or wires during insulation measurements.
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