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MPK105R High-Current Micro-ohmmeter

The MPK105R is a portable, microprocessor-controlled high-current micro-ohmmeter optimized for low resistance testing in electrical substations and industrial applications. With test currents from 5 A up to 100 A, it is ideal for accurately measuring very low contact resistances in circuit breakers, switches, and busbars.

Employing the four-terminal U/I method, the MPK105R eliminates errors due to test leads and their resistances. It provides measurement resolution down to 0.1 μΩ, with digital display of results up to 4½ digits. Built with advanced filtering, Modbus communication, and robust protections, it is suited for both field and laboratory environments.

Housed in an IP65-rated impact-resistant cabinet, the MPK105R is strong yet lightweight and designed for reliable operation under severe environmental conditions.

Function

• Low resistance measurement with 4-terminal Kelvin method
• Test currents adjustable from 5 A to 100 A true DC
• High resolution readings down to 0.1 μΩ
• Built-in memory for up to 4000 readings
• Auxiliary clamp input for additional current measurement
• Communication via USB, Bluetooth, and Modbus protocol
• Programmable test time for flexible applications
• Advanced protections against overheating, overcurrent, and short-circuit
• Rugged IP65 construction for substation and field testing
• BSG (Both Side Grounded) mode for enhanced safety

Technical Specifications

test current

  • 5 A to 100 A (true DC)

  • Adjustable in 0.2 A steps (5–20 A) and 1 A steps (20–100 A)

resistance ranges

  • 0.1 μΩ to 2 mΩ (0.1 μΩ resolution)

  • 2 mΩ to 300 mΩ (10 μΩ resolution)

measurement principle

  • Four-terminal U/I method

accuracy

  • ±1 % of reading (50 μΩ to 300 mΩ)

programmable test time

  • 15 to 120 seconds (5–100 A range)

auxiliary clamp measurement

  • Range: 0.1 A DC to 60 A DC

  • Accuracy: 1 % + 3 digits

display

  • Alphanumerical, 4½ digits resolution

memory / communication

  • Memory for 4000 readings, organized by records

  • USB interface for configuration, control, and data download

  • Bluetooth connectivity for configuration and control

  • Modbus open protocol for integration with PLC, LabView, or Android app

protection

  • Overheating

  • Overcurrent

  • Short-circuit

environmental protection

  • IP65 (with closed lid)

safety compliance

  • IEC 61010-1

power supply

  • 100–240 V AC mains

operating conditions

  • Temperature: -10 °C to +50 °C

  • Humidity: 95 % RH (non-condensing)

storage conditions

  • Temperature: -25 °C to +70 °C

dimensions

  • 502 × 394 × 190 mm

weight

  • ~11 kg

Key Features

  • BSG mode (Both Side Grounded)

  • High resolution 0.1 μΩ readings

  • Open Modbus protocol for remote control

  • Rugged and portable for field and lab applications

  • Performs fast, accurate, and repeatable measurements

Standard Accessories

  • Auxiliary current clamp

  • Ground cable

  • Power cord

  • USB cable

  • Accessory case

  • User manual

  • T-Logger software (download)

  • Tentech Remote Control Android app (download)

Optional Accessories

  • 2 combined current and potential leads – 6 m

  • 2 combined current and potential leads – 8 m

  • 2 combined current and potential leads – 10 m

  • 2 combined current and potential leads – 12 m

  • 2 combined current and potential leads – 15 m

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