Digital Micro-Ohm Meter (4-Terminal Kelvin)

About.

The MR-253A (formerly catalogued as MR-253) is a compact, precision bench-top micro-ohm meter for measuring low values of resistance - in cables, transformer and motor windings, switch and relay contact resistance, PCB track resistance, and ammeter shunt wire calibration. It uses a four-terminal (Kelvin) measurement technique that eliminates errors from lead and contact resistance, which is critical for accurate measurement in the microohm-to-kiloohm range. Displayed on a 3½-digit, 1999-count seven-segment LED display. Test current varies automatically by range, from 2 A (lowest resistance range) down to 0.01 mA (highest range). Accuracy: ±0.5% ±2 digits. Built using MOS LSI technology. Mains powered, 230 V, 50 Hz. Dimensions: 285 × 210 × 100 mm. Weight: 2.8 kg. Supplied with 2 pairs of test leads.

• Cable and wire resistance measurement
• Transformer and motor winding resistance checks
• Switch and relay contact resistance testing
• PCB track resistance testing and ammeter shunt calibration

Specifications.

Display

3½-digit, 1999 counts, seven-segment LED

Measurement Technique

4-terminal (Kelvin) - eliminates lead and contact resistance error

Accuracy

±0.5% ±2 digits

Range

1999 µΩ / 19.99 mΩ / 199.9 mΩ / 1999 mΩ / 19.99 Ω / 199.9 Ω / 1999 Ω / 19.99 kΩ

Test Current

Automatically varies by range: 2 A (1999 µΩ range), 1 A on the next two ranges, down to 0.01 mA (kΩ range)

Power

230 V, 50 Hz, single phase

Dimensions

285 × 210 × 100 mm (approx.)

Weight

2.8 kg (approx.)

Accessories

2 pairs of test leads (supplied)

Warranty

12 months against manufacturing defects only