M4100 4th Gen Insulation Analyzer Series


M4100 4th Gen: The world's most advanced test system for power apparatus diagnostics

M4100 4th Gen Insulation Analyzer

The M4100 is the world’s premier power apparatus and insulation test instrument. Its unique combination of test capabilities and artificial intelligence analysis software makes it the power industry’s most trusted Power Factor/Tan-Delta instrument. These instruments are used around the globe thanks to their comprehensive testing options, safety features and measurement accuracy.

Doble Test Assistant® (DTA) Software



DTA6 is the most comprehensive software tool for the collection, analysis and management of test results for the Doble M-Series family of instruments. DTA6 includes remote access to stored data from your personal Doble Database for backup and asset management. 

DTA6 takes asset management to the next level with the First Response Analytics Knowledgebase™. FRANK is an artificial intelligence system that "thinks", helping you instantly analyze your test results along with clear recommendations and explanations.

 Options to extend the capabilities of your M4100:

Safety Strobe

The Safety Strobe flashes while M4100 tests are in progress, providing a visual warning of high voltage.

Temperature/Humidity Probe

The Temperature/Humidity Probe automatically measures temperature and humidity, providing critical information for the diagnostic evaluation.

M4300 Transport

The M4300 Transport cart ensures smooth, easy travel over all terrain.

Transformer Turns Ratio Capacitor

With the addition of the Transformer Turns Ratio Capacitor, the M4100 can measure the turns ratio of power transformers at potentials up to 10 kV.

M4140 Capacitor Bank Test Kit

The M4140 Capacitor Bank Test Kit contains a clamp-on CT probe and cable that allow you to test individual capacitors in a capacitor bank without disconnecting them from the bank.

Type C Resonating Inductor

The Type C Resonating Inductor is an adjustable reactor designed to extend the charging current range of the M4100, for testing larger apparatus.


M4110 Leakage Reactance Interface

Use the M4110 Leakage Reactance Interface to perform short-circuit impedance tests on transformers – a vital tool in diagnosing winding deformation.

M4120 External Reference Module

The M4120 External Reference Module allows you to use the measurement circuit of the M4100 with an external power supply and reference capacitor to test at voltages greater than 12 kV.

Equipment Cases

High-density-plastic molded transport cases are designed for shipping the M4100 or M4300 by air freight or truck over rough terrain.



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