Contact Resistance Meter: CRM100A

Motwane’s Contact Resistance Meter- CRM-100A is a Digital Micro Ohmmeter, designed to measure extremely low resistances. The instrument is based on the proven four wire measurement method for low resistances to eliminate the effect of lead resistance of two wire methods.

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    Motwane’s Contact Resistance Meter- CRM-100A is a Digital Micro Ohmmeter, designed to measure extremely low resistances. The instrument is based on the proven four wire measurement method for low resistances to eliminate the effect of lead resistance of two wire methods. The instrument is designed to replace a complex bridge set up with a single compact unit. The DC injection is adjustable between 10A to 100A. The testing information is displayed on a large LCD with a backlight and real-time data is displayed during the test ON conditions. The instrument gives a high resolution of 0.1μΩ on 200 μΩ resistance range. The instrument is easy to operate and user friendly. Accessories are rugged and come with heavy duty clips for better grip on the test objects. The kit and accessories are housed in a trolley mounted case for easy transportation. Advanced Dot Net based software is provided for data downloading, analysis, and report generation. The instrument can be operated through software from a remote location. Internal memory is provided for onsite data storage.


    Stationary and moving contacts are built from alloys that are formulated to endure the stresses of electrical arcing. However, if contacts are not maintained regularly, their electrical resistance builds up due to repeated arcing, resulting in a significant decrease in the contact’s ability to carry current and an increase in resistance. Excessive corrosion of contacts is detrimental to the breaker’s performance. Hence to check contacts, apply DC and measure the contact resistance or voltage drop across the closed contacts. The use of a higher current value gives more reliable results than using lower current values. The resistance value is usually measured in micro ohms (μΩ).

    CRM-100A has a large application for direct and indirect measurements in various industries and manufacturing facilities. High accuracy and repeatability make it a reliable tool for quality assurance and easy operations. It is a very handy tool for quick maintenance checks in various industries. 

    Typical resistance measurement applications are:

    1. Circuit breaker contact resistance in non-energized areas
    2. Electrode resistance measurement
    3. Bus bar joints
    4. Isolator contacts
    5. Cable drum resistance measurement
    6. Cable splice
    7. Weld joints
    8. Bond resistance


    • Continuously selectable current in steps of 10, 20, 50 & 100A respectively
    • Digital resistance reading from 0.1μΩ to 20mΩ
    • Simultaneous display of test current and resistance
    • Minimum resolution of 0.1μΩ
    • Accuracy ± (0.5% +5 digits)
    • 31⁄2-digits readings for resistance
    • Custom-built LCD with a backlight and sealed soft touch membrane keypad
    • Data exchange to PC through the USB interface
    • Built-in memory to store up to 99 test results
    • Test ‘ON’ indicator with LED & beep, provided to signify the flow of Direct Current to DUT

    Output current :

    DC test current: 10A, 20A, 50A & 100A 
    Accuracy: 5% 
    Open circuit voltage: 5V DC

    Resistance Measurement:

    Resistance ranges      200μΩ 2mΩ 20mΩ
    Resolution 0.1μΩ   1μΩ 10μΩ
    Accuracy ±(0.5% + 5 digits)

    Operation Time 

    Continuous operation up to 50A 
    4 minutes-ON and 10 minutes-OFF for 100A


    3½ digit large LCD display

    PC interface 

    USB for data transfer


    Audio-visual indication for test on operation
    Indication on mains on the operation 
    Blinking display for over range indication

    Power Supply 

    230V, 50Hz ± 10%


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


    Dimensions ( DxWxH in mm ) : 365 x 426 x 178
    Weight : 12 Kg

    Safety Standards 

    Safety : According to EN 61010 – 1 
    EMC : According to EN 61326 – 1 

    Accessories Standard 

    Output lead set 4 X 5m 
    Mains power cord
    Mains protection fuse 5A 
    User manual 
    Calibration certificate 
    Carry case 


    Software CD 
    USB cord

    Note: Do not use this instrument in the HT switchyard

    Our Customers

    Motwane’s customer base is a testament to its ongoing ability to provide reliable, accurate, and long-lasting products, resulting in enduring relationships that are based on mutual satisfaction, loyalty, and trust.

    Contact Us

    Motwane products are highly reliable, built with great quality, and deliver accurate results.  We at BSES Rajdhani Power have been using Motwane products for many years, and continue to do so.

    Shailendra Saxena

    Additional VP Protection BSES Rajdhani Power Ltd.

    Motwane is the oldest and the most trusted company in electrical testing products and solutions also. Motwane is known for reliable and rugged products also, we have procured from them. And our organization has been using these products and have found them satisfactory in performance and services also.

    Mr. Shrikant S Rajurkar

    Director Technical MSETCL

    By using the MOT-WARE software, all equipment testing difficulties have been removed, leading to increased efficiency and happy clients.

    Mr. Milind Thekedar

    Managing Director JBS Enterprises Pvt. Ltd.

    Motwane offers great products! The company fullfills our demands, and supplies reliable products for our Power, Oil & Gas, and other industry projects.  

    Justin Thomas

    FAWAZ Trading & Engineering Services Co. W.L.L.

    MOTWANE is reputed brand since many years & we prefer it for all our International Projects

    Nikunj Mistri

    DGM- India Operations MBH Power Pvt. Ltd.

    We are very satisfied on Motwane’s oil testing products to test electrical properties of Insulation Oil


    LABGULF Sharjah UAE

    TATA Projects regularly uses Motwane’s Test & Measurement equipment for various undertakings. We are satisfied with the product performance!

    Naiyar Kamal Siddiqui

    AGM Projects Tata Projects Ltd.

    MOT-WARE will enable us to go live with data immediately after recording

    Sanjay Sarkar

    Head Projects IBMS SPG, Sterling and Wilson

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