Introduction - Extech Instruments MG320 User Manual

1. Introduction
Congratulations on your purchase of the MG320 True RMS Insulation Resistance CAT IV 600V DMM.
The MG320 features a rugged design for heavy duty use. The MG320 measures Insulation
Resistance, AC/DC Voltage, and Resistance.
Insulation Resistance tests are automatic ranging with 5 test voltages from 50V to 1000V. The
MG320 can store and recall up to 99 measurements.
The MG320 is suitable for measuring the insulation resistance on elecrical equipment such as
transformers, motors, cables, switches, and appliances.
Proper use and care of this meter will provide years of reliable service.
Features

True RMS AC/DC Voltage Measurments to 600V

Insulation Resistance Measurements up to 20G

Low Resistance/Continuity Measurements to 20k

Auto Ranging measurements

Polarization Index (PI) and Dielectric Aborption Ratio (DAR) tests

Five (5) Insulation Resistance test voltages (50, 100, 250, 500, and 1000V)

Insulation Resistance tests in10% voltage steps (from 50% to 120% of range)

Front panel LED test voltage alert lamp

Eight (8) Insulation Resistance measurement ranges (automatic ranging)

Pass/Fail Comparator function

Auto-discharge at end of test

High voltage display symbols

Hand's free test lock feature

Manually store and recall up to 99 readings

Overload indication

Optional remote test probe for controlling the TEST button remotely

Test leads, alligator clips, batteries, user manual, and case included
2. Safety
Warning and Caution safety label
Double Insulation
DC Direct Current
AC Alternating Current
Low Battery
Fuse symbol
High Voltage Alert
Audible beeper
Earth ground
Complies with EC standard
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