 23.05.2012 The new MG300 from Extech Instruments is a true-rms multimeter with a built-in insulation resistance tester. The instrument’s wireless data streaming provides added safety to users, who can monitor real-time readings on a laptop or computer screen from up to 30 ft away. By adding insulation-testing capabilities to a DMM (digital multimeter), Extech has made it easier for electricians to make insulation testing a more routine part of predictive maintenance. The waterproof combination meter includes a digital insulation-resistance tester (or megohmmeter) with four test voltages for measuring resistance up to 4 GΩ with 0.001-MΩ resolution. The full-function DMM includes duty-cycle measurements and milliamp readings for analog 4–20-mA current loops in industrial analog process controls.
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