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Doble M4100

Doble M4100 – Tan Delta test equipment

Model number
Shipping details
Hard case 25kg 45L 45W 35H
Daily rates
Cost per day
Duration (days)
Typical Hire Periods
1 month
2 month
All prices are ex-GST
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Industry standard for power apparatus and insulation testing

The M4100’s unique combination of test capabilities and artificial intelligence analysis software makes it the power industry’s most trusted Power Factor/Tan-Delta instrument.

The M4100 instruments are used around the globe thanks to their comprehensive testing options, safety features and measurement accuracy.

Testing is simple and accurate with the M4100 and Doble Test Assistant (DTA) software. You can then analyze your test results with the help of FRANK™, the First Response Analytics Knowledgebase, which provides clear recommendations and explanations.


• Power Factor/Tan-Delta testing to confirm insulation integrity and quality
• Capacitance testing to measure physical changes that may have occured to the apparatus
• HV turns ratio testing to detect shorted turns or winding damage
• Leakage reactance/short circuit impedance testing to evaluate winding
• Single phase excitation current testing to evaluate transformer magnetizing circuit
• Capacitor bank testing to detect deteriorating or failed capacitors within a bank
• Generates its own precise sine wave test signal
• Self-calibrating in the field
• Easy and accurate testing with Doble Test Assistant software (DTA)

• Safety is our priority with dual safety switches, power strobes and ground earth
relay interlocks
• Eliminates the effect of varying electrostatic interference with patented Line
Frequency Modulation, which makes measurements at a frequency above and
below the system frequency
• Reliability & Accuracy—generates its own clean test signal using an internal
waveform generator for reliable results and stable readings
• Software firmware system senses abnormal current, temperature and voltage
operation even before a user would notice
• Instantly analyze your test results, providing clear recommendations and
explanations with FRANK™, the First Response Analytics Knowledgebase

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Doble M4100