YOKOGAWA 2793 Decade Resistance Box 0.100 to 1111.210Ω High Accuracy

The Yokogawa 2793 Decade Resistance Box is a high-accuracy DC variable resistor for precision calibration and measurement applications. Available in two models - the 279301 for medium resistance ranges (0.1 Ω to 1,111.210 Ω) and the 279303 for high resistance ranges (0 Ω to 111.1110 MΩ) - this instrument delivers stable, repeatable performance in demanding laboratory environments. The six-dial configuration with in-line display enables rapid resistance setting and clear readability.

Shock and vibration proof construction ensures reliable operation across calibration, testing, and bridge measurement workflows.

Technical Specifications

Model 279301 (Medium Resistance)

• Resistance range: 0.1 Ω to 1,111.210 Ω


• Resolution: 1 mΩ


• Accuracy: ±(0.01 Ω + 2 mΩ) at 23 ±2°C, 45–85% humidity, 0.1 W or ±0.01%


• Maximum input power: 0.2 W/step; 1 W overall


• Maximum input current: 50 mA (100 Ω), 150 mA (10 Ω), 500 mA (1 Ω), 1.5 A (0.1 Ω) Model 279303 (High Resistance)


• Resistance range: 0 Ω to 111.1110 MΩ


• Resolution: 100 Ω


• Accuracy: ±0.05% or ±0.05 Ω


• Voltage coefficient: <±0.1% at 1 MΩ and 10 MΩ steps (100 V); 500 MΩ at 500 V DC (panel to circuit)


• Power dissipation: ≤1 W overall


• Operating conditions: 23 ±2°C, 45–85% humidity


• Rack-mountable

Key Features

• Six-dial selector for precise, repeatable resistance values


• 1 mΩ minimum step (279301) or 100 Ω step (279303)


• Low power dissipation suitable for delicate circuits


• High dielectric strength for safety-critical calibration work


• Stable performance across specified environmental ranges

Typical Applications

• Calibration of resistance thermometers and bridge circuits (279301)


• Calibration of insulation resistance testers and bridges (279303)


• Laboratory measurement and standard reference applications

Compatibility & Integration Rack-mounting capability enables integration into standardized test benches and automated calibration systems. Both models accept connection within the specified current and voltage limits for bridge circuits and precision measurement setups.