Description
Technical Specifications
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Model: DM-251
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Measurement Range: 0.1 μΩ to 1.9999 kΩ
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Measurement Method: 4-Wire Kelvin connection
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Alpha (α) Values: Changeable for different metals & alloys
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Temperature Compensation: Automatic correction to R20
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Display Parameters: Rt, R20, α value, material type, temperature
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Zero Adjustment: Set-zero function for lead resistance elimination
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Controls: Precision range selector knob
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Construction: Portable, rugged enclosure with carry case
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Power Supply: Mains operated
Product Overview
The Digital Micro-Ohm Meter with changeable alpha (α) values is a high-precision instrument designed for accurate low-resistance measurements with built-in temperature compensation. It allows users to select material-specific α values, ensuring true resistance readings regardless of ambient temperature variations.
Using the 4-wire Kelvin measurement technique, the instrument eliminates contact and lead resistance errors, making it ideal for measuring very low resistances in cables, conductors, joints, and metallic components.
The digital display provides real-time indication of measured resistance (Rt), corrected resistance at 20°C (R20), selected alpha value, material type, and temperature—offering complete visibility and confidence during testing.
Key Features
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Selectable α (alpha) values for different metals and alloys
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Accurate temperature-corrected resistance measurement
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4-wire Kelvin method for ultra-low resistance accuracy
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Wide measuring range from micro-ohms to kilo-ohms
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Clear digital display with multiple parameters
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Set-zero function to cancel test lead resistance
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Portable design with rugged carry case for field applications
Applications
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Cable and wire resistance testing with temperature correction
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Quality control and R&D laboratories
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Testing of conductors, busbars, joints, and coils
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Evaluation of metallic materials and alloys
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Electrical maintenance and inspection work
