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CRM 100B Contact Resistance Meter

The CRM 100B is a portable 100 A DC contact resistance meter designed for accurate measurement of low resistance values in switchgear, busbars, transformer terminals, and circuit breakers. It features a true four-terminal Kelvin measurement method, micro-ohm accuracy, and high-current stability for precise evaluation of electrical contact integrity in field and laboratory conditions.

Key Features

  • True four-terminal (Kelvin) measurement ensures high accuracy

  • High output current up to 100 A DC for low-resistance testing

  • Digital display with direct readout in µΩ / mΩ

  • Over-temperature and open-circuit protection

  • Auto current reversal for thermal EMF compensation

  • USB / RS-232 interface for data logging

  • Compact, rugged and lightweight for field use

  • Conforms to IEC standards for contact resistance testing

Technical Specifications

Parameter Specification
Output Current 10 A – 100 A DC (selectable)
Resistance Range 0.1 µΩ – 299.9 mΩ
Resolution 0.1 µΩ
Accuracy ± 0.5 % of reading ± 2 digits
Display 4½-digit LCD
Power Supply 230 V AC ± 10 %, 50 Hz
Protection Thermal and short-circuit
Communication RS-232 / USB
Dimensions 430 × 370 × 190 mm
Weight ≈ 12 kg

Standard Accessories

  • Main unit with test current and potential leads

  • Power cord

  • Calibration certificate and user manual

  • Carrying case

Applications

  • Measurement of contact resistance in switchgear & circuit breakers

  • Busbar joint and transformer connection testing

  • Quality control for conductors and connectors

  • Field diagnostic testing and periodic maintenance

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