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MPK203x Digital Ohmmeter

The MPK203x is a smart, portable high-current micro-ohmmeter designed for accurate measurement of very low contact resistances in high-voltage circuit breakers, switches, busbars, and similar applications. With selectable test currents up to 200 A, the MPK203x combines advanced filtering, protection systems, and digital precision to deliver reliable results in both field and laboratory environments.

Using the four-terminal Kelvin method, the MPK203x eliminates errors due to test lead and contact resistances. Resistance readings are displayed on an alphanumeric display with up to 4½ digits resolution, with a best resolution of 0.1 μΩ. The instrument also features internal memory for data storage, a USB interface for data transfer, and a built-in printer for direct reporting.

Housed in a rugged IP65-rated cabinet, lightweight and impact-resistant, the MPK203x is suitable for demanding environments while maintaining laboratory-grade accuracy.

Function

• Precision measurement of very low resistances from 0.1 μΩ to 20 mΩ
• High test current up to 200 A true DC
• Four-terminal Kelvin principle eliminates lead resistance errors
• Digital alphanumeric display with up to 4½ digits resolution
• USB interface and built-in memory for storing 200 readings
• Built-in printer for immediate test report generation
• Bargraph display of test current for inductive load stabilisation
• IP65-rated housing for robust field performance
• Fast and accurate measurements with high repeatability

Technical Specifications

test current

  • 100 A and 200 A (true DC)

  • Continuously adjustable from 0 to 100%

resistance ranges

  • 0 to 2000 μΩ (up to 200 A)

  • 0 to 20 mΩ (up to 100 A)

resolution

  • 0.1 μΩ (0 to 2000 μΩ)

  • 1 μΩ (2 mΩ to 20 mΩ)

output voltage

  • 3.5 V DC at 200 A

  • 4.5 V DC at 100 A

  • 5.8 V DC without load

maximum load resistance

  • 10 mΩ at 200 A

  • 30 mΩ at 100 A

measurement principle

  • Four-terminal, U/I

accuracy

  • 2000 μΩ range:
    • ±0.5 % ±2 digits (200 μΩ to 1999.9 μΩ)
    • ±1 % ±2 digits (0 to 199.9 μΩ)

  • 20 mΩ range:
    • ±0.5 % ±2 digits (2 mΩ to 20 mΩ)
    • ±2 % ±2 digits (0 to 1999.9 μΩ)

continuous operation time

  • 200 A: approx. 3 minutes before thermal protection activates

  • 100 A: approx. 15 minutes before thermal protection activates

display

  • Alphanumeric, up to 4½ digits

  • Current bargraph indicator

memory / interface

  • Built-in memory for 200 readings

  • USB interface for data transfer

  • Compatible with T-Logger software for analysis and reporting

  • Built-in thermal printer for direct reporting

protection

  • Overheating protection for all sensitive components

environmental protection

  • IP65 (with closed lid)

safety compliance

  • IEC 61010-1

power supply

  • Mains: 220–240 V AC

operating conditions

  • Temperature: -5 °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

  • Microprocessor controlled

  • Resolution down to 0.1 μΩ

  • Resistance range up to 20 mΩ

  • High test current up to 200 A

  • Four-terminal Kelvin-type measurement

  • Internal memory for 200 readings

  • Built-in USB interface and printer

  • Overheating protection

  • Rugged IP65-rated housing

Standard Accessories

  • Power cord

  • Ground cable

  • USB cable

  • Accessory case

  • User guide

  • T-Logger software (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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