Winding Resistance Meter : XWRM-10A

XWRM-10A transformer winding resistance meter is designed for accurate & fast measurement of the highly inductive loads such as transformers, reactors, HT motors, etc. The selectable smooth DC test current is useful to test windings with different ratings. The 48V open circuit voltage can saturate the core quickly to get stable readings.


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    XWRM-10A transformer winding resistance meter is designed for accurate & fast measurement of the highly inductive loads such as transformers, reactors, HT motors, etc. The selectable smooth DC test current is useful to test windings with different ratings. The 48V open circuit voltage can saturate the core quickly to get stable readings. The three resistance measurement channels are used for the simultaneous measurement of the three windings to reduce the testing time. The heat run test feature can be availed with graphical representation with the software and also has demagnetization property. XWRM-10A can test the make-before-break operation of on-load tap-changers which can help you analyze the OLTC switch contracts. Backed with EMF protection against high inductive kickbacks, the large LCD with a keypad provides easy operations. It also has an internal memory for 2000 test results. The software is designed for detailed report generation and control. The in-built thermal printer provides onsite report printing.

    XWRM-10A has a Bluetooth module with the Motware mobile app for remote access to the testing data & storage in the cloud for further analysis & record purposes.


    The winding resistance test is an essential test that enables the identification of shorted turns, loose connections, or deteriorating contacts in tap changers and measurements on all tap changer positions. The transformer’s condition can be compared to previous or factory test values for evaluating the condition of the current windings and leads. The accepted criteria for the field-measured values should be within 3% of the factory values. A change higher than the accepted criteria is indicative of short-circuited turns, poor joints, or bad tap changer contacts. This test should be performed during acceptance testing and can also be performed while other maintenance electrical tests are conducted.

    • Power Transformer 
    • Motor and Generator
    • Reactor
    • Heat Run Test


    • Test currents of 10A,1A, 100mA & 10mA 
    • Resolution of 0.1μΩ with ± 0.1% accuracy 
    • 3 independent resistance measuring channels
    • Auto range facility
    •  Heat run rest facility 
    • 48V open circuit voltage for stable readings 
    • Demagnetization facility
    • OLTC dynamic test with a graph: Time vs Current 
    • Inbuilt thermal printer & memory 
    • Bluetooth enabled for Motware mobile app

    Power Supply: 115/230VAC,50/60 Hz 

    Test Current:

    10A, 5A, 1A, 100mA & 10mA 
    Open-Circuit Test Voltage: 48 VDC 
    Burden: 500VA

    Resistance Measurement Range 

    Accuracy: ±(0.1% of rdg. ± 5counts) 

    Test Current Range (Ω) Resolution (Ω) Maximum Display (Ω)
    10A 1A 100mA 10mA
    2mΩ 0.1uΩ 1.9999mΩ
    20mΩ   1uΩ 19.999mΩ
    200mΩ 10uΩ 199.99mΩ
    0.1mΩ 1.9999Ω
    20Ω 1mΩ 19.999Ω
    200Ω 10mΩ 199.99Ω
    2000Ω 0.1Ω 1999.9 Ω


    Test Current Range (Ω) Resolution (Ω) Maximum Display (Ω)
    5A 4 mΩ 0.1 µΩ 4.0000 mΩ
    40 mΩ 1 µΩ 40.000 mΩ
    400 mΩ 10 µΩ 400.00 mΩ
    4 Ω 0.1mΩ 4.0000 Ω


    Principle: 4 wire measurement 
    Measurement Channel: 2 resistance & 1 current channel
    Display: LCD 
    Keypad: Sealed soft touch keypad 
    Indication: LED and beep during the test on & discharge 
    PC Interface: USB 
    Internal memory: 100 test readings

    Safety & Standards 

    Ingress Protection: IP 54 
    CE Certification
    Safety: Compliant with IEC 61010-1 
    EMC: Compliant with IEC 61326-1


    Conditions Operating Temperature: 0°C to 55°C 
    Storage Temperature: -10°C to 55°C 
    Humidity: <90% RH, non condensing

    Physical Specifications 

    Dimensions (L×W×D) mm: 485 x 392 x 192
    Weight: 10 kg 

    Software Details 

    Type: Windows based analytical software 
    Data Transfer: Real-time data transfer 
    Features: Online data acquisition 
             Graph plotting for heat run test & OLTC dynamic test 
             Remote operation 
             Test report generation 

    Standard Accessories 

    15 meters measuring test lead set 
    Mains power cord 
    Short links – 2Nos. 
    Earthing lead 
    User manual 
    Calibration certificate 
    Carry case for test leads 

    Optional Accessories

    OLTC probe
    PC Software 
    USB cord 
    Temperature sensor 
    Bluetooth application via cloud based Motware application

    Motware Cloud Application

    Motwane has designed and developed MOT-WARE – a cloud-based Test Data platform to aid in accurate Asset Health Assessment. Through Motware, the Test and Measurement industry has taken a huge leap forward. It is a revolution in the way tests are conducted and the way data is analyzed. 

    MOT-WARE captures data from a full range of BLE Enabled Motwane Testing Equipment. It is accessible from web based applications, desktop applications, and mobile applications. In addition, it offers an open architecture that can seamlessly integrate with any non Motwane Test and Measurement equipment for quick and authentic digital test data. Data can be captured periodically as well as streamed in real-time via sensors from IoX’n Series of IoT devices. (link to Ioxn page)

    Some of its features include a pre-loaded repository of test templates for various assets as well as customizable test templates. A customized report builder in MOT-WARE allows users to create reports that can be designed and generated as per their desire. MOT-WARE also has a facility to upload test data history and the breakdown history of the assets. Tests can also be viewed by various metrics such as Pass/Fail.

    Digital test data enables data analytics and visualization which offers multiple statistical advantages. It improves productivity & efficiency, enables cost reduction, and improves asset life. Data analysis done through MOT-WARE includes trend analysis, MIS reports, and pivot tables. As an add-on, MOT-WARE also offers ‘Motwane AI Analytics’(Link to AI Analytics page)  which uses a proprietary AI algorithm and Machine Learning to make accurate predictions about your asset’s life based on its behavioral patterns and operating conditions.

    MOT-WARE can be used for various applications across customer segments like Utilities, OEMs, Industries, Electrical contractors (Testing, O&M) or Field repairs & service providers, EPCs, commercial premises, and many more. 

    Join the latest innovation in Electrical Testing by using Motware on your Test and Measurement equipment.

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