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Digital Micro-ohmmeter HARES 300A

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Digital Micro-ohmmeter HARES 300A

HARES-300A is a micro-ohmmeter produced using advanced engineering technologies which can apply up to 300 A current. With its easy-to-use software, HARES-300A can easily measure contact resistances of circuit breakers, shunt and disconnector by applying adjustable current from 1A to 300A.

It can calculate the real values of the resistors by providing penetration with the feature of the continuous current application. HARES-300A can measure from 0.1 µ Ω to 5 Ω. HARES-300A is capable of measuring static and dynamic resistance of the contact points of the circuit breaker.

HARES-300A can measure idle circuit breakers as well as dual grounded circuit breakers. The optional current clamp will be able to measure the part of the current going through the ground line during the test and make the calculations considering this component.

The frequently used test models can be saved as templates and the tests can be performed more rapidly and quickly. Thanks to the quick test feature of the HARES-300A user interface, the test can be performed in barely 15 seconds.

The 4.3-inch touch colour display shows all measurement results manifest on a single screen. With an easy-to-use user-friendly interface, the HARES-300A guides operators to perform tests quickly.

HARES-300A’s flash memory feature allows controlling, recording and storing measurement results (up to 300 Test Records). And also the user can copy test records using a USB drive. Operators can easily print the measurement results with the 2.25-inch built-in printer of HARES-300A and can prepare on-field reports easily.

The HighTest data management platform (DMP Software) can also be used to control HARES-300A remotely by a PC and the measurement results can be easily analysed and stored in the PC.

With the HARES-300A’s Bluetooth option, tests can be started remotely via DMP software and the results can be transferred to the PC. Thus, on-field tests can be performed even by a single person.

With HARES-300A’s temperature measurement channel, the temperature values of the measured sample can be taken and calculated according to the desired temperature value. HARES-300A is a compact, rugged device with IP67 protection class (case closed) which weighs 9 kg.


    Measurement Parameter Contact Resistance
    Measurement Modes Static Resistance, Dynamic Resistance & Dual ground
    Test Current 1 A to 200 A
    Measurement Range 0.1 µΩ to 5 Ω
    Accuracy Typical: 0.1% ± 0.1% Fs


    Guaranteed: 0.5% ± 0.1% Fs

    Display 4.3-inch TFT touch Display (visible under sunlight)
    Memory Up to 200 records with 25 intervals for each
    Communication USB 2.0/1.1 Standard-A, USB 2.0/1.1 Standard-B, Bluetooth (factory-installed option)
    PC Software DMP Software
    Printer 2.25-inch Built-in Printer
    Test Plan Up to 6 plans
    Current Clamp Yes, Optional
    Power Supply 100-240 V 47/63 Hz
    Dimensions 16.7″ x 13.4″ x 6.8″  (424 mm x 340 mm x 173 mm )
    Weight 9 kg
    Operating and Storage temperature Working:   -10 °C to + 60 °C


    Storage:     -30 °C to 70 °C

    Humidity 95% RH non-condensing
    Protection Class IP67 (case closed)
    Set of Package DARES-200, Power Cable, Ground Cable, 10 m (33 ft.) Standard Test Cable Set, USB Cable, Printer Paper (x2), USB flash drive, Instruction Manual (Soft Copy), DMP Software, Cable Bag
    Options Hard Carrying Case, Length Customised Cables, Bluetooth (factory-installed option), Current Clamp


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