Doble M Rent and purchase options available at JM Test. The M is the leading instrument for evaluating the condition of high-voltage power. Insulation systems associated with many types of high-voltage power apparatus and devices often consist of a mix of non-homogeneous component parts. The Doble M evaluates the integrity of high-voltage substation apparatus by measuring the power factor/tangent delta along with capacitance to evaluate.

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Click the “Get A Quick Quote” button to get started. Get a quick quote: The M is the leading instrument for evaluating the condition of high-voltage power apparatus.

The M has the power to test a wide range of apparatus, making it highly versatile. The accuracy of test results is doblw related to the quality of the test signal.

The M allows you to perform a variety of diagnostic tests: The internal measurement circuitry is fully digital. Electrical glove testing is available at JM Test Systems. Rugged construction provides the accuracy of a laboratory instrument with the ability to withstand harsh field conditions.

It also measures capacitance, to evaluate physical changes to the apparatus.


The result is highly accurate and repeatable measurements. New PurchaseRental.

Doble M4100, 4th Gen

We can also help with these: While most test instruments use available power lines or portable generators to generate the output test signal, the M uses an internal waveform generator to create its own precise sine wave. Cleaning, dielectric testing, drying, visual inspections, stamping, packing, and documentation is all Automated setup eliminates errors. Even a small change in a measurement becomes a reliable diagnostic indicator.

This produces reliable results and stable readings. With a maximum output of mA at 10 kV, the M offers high charging current, allowing you to run single-phase exciting current tests at higher voltages, increasing the turn-to-turn stress.

Unlike other test instruments, the M eliminates the need to balance the bridge, automatically making measurements for you. It sets the standard for accuracy, reliable test results, and intelligent diagnostics for customers worldwide.

Get a Quick Quote. Advanced digital technology takes accuracy to new levels. Built-in test set diagnostics provide information on instrument status. It also offers a range of built-in self-diagnostic tools.

Electrical Safety Onsite Testi Generates its own clean test signal for the most reliable and repeatable results.

Doble M, 4th Gen | Accutech Rentals

JM Test Rental options can help you save capital, get the latest technology, and expand your capabilities. If you need more current than mA for large apparatus, the Type C Resonator option extends the range. The Liquid-Insulation Cell Oil Cellalso supplied with the M, can be used in the field for a quick accuracy check.


The quality of the power source is not an issue. Provides the highest power to better replicate in-service conditions. The M also uses a patented technique called Line Frequency Modulation, in which measurements are made at a frequency above and below the system frequency, to eliminate the effect of electrostatic interference.

Records are presented in a format that is easy to read, save, and print.

Dielectric testing for our electrical testing laboratory. M software makes testing easy, fast, and smart.

Doble M4100 Insulation Analyzer

Daily, Weekly and Monthly rates are available on select items. The M instrument comes with M software odble simplify the management of test results. Doble M Power Factor tester.