Yokogawa 2792A Standard Resistor

The Yokogawa 2792A Standard Resistor is a precision reference standard for DC resistance calibration and metrology applications. Engineered for laboratories and industrial environments requiring traceable electrical measurements, the 2792A delivers calibrated accuracy from ±5 ppm to ±100 ppm across a resistance range of 0.001 Ω to 1 MΩ. Metal foil and wire resistor elements ensure superior stability compared to older winding designs.

Four-terminal construction (0.001 Ω to 1 kΩ) and three-terminal construction (100 kΩ, 1 MΩ) minimize thermal EMF and contact resistance. The 2792A integrates directly with potentiometers and bridges for precise DC measurements.

Technical Specifications

• Resistance Range: 0.001 Ω to 1 MΩ across 10 steps


• Nominal Values: 0.001 Ω, 0.01 Ω, 0.1 Ω, 1 Ω, 10 Ω, 100 Ω, 1 kΩ, 10 kΩ


• Element Material: Manganin wire (0.001 Ω–10 kΩ); nickel and chromium wire (100 kΩ–1 MΩ)


• Calibrated Limit of Error: ±10 ppm to ±100 ppm; Testing (Calibrated) Accuracy: ±5 ppm


• Temperature Coefficient: −5 to +15 ppm/°C (α₂₀); less than −0.7 ppm/°C² (β₂₀)


• Annual Drift: ±100 ppm/year (0.001 Ω) to ±30 ppm/year (1 Ω, 10 Ω, 100 Ω, 1 kΩ)


• Maximum Power: 3 W at ±100 ppm/W


• Insulation Resistance: >1000 MΩ @ 500 V DC


• Dielectric Strength: 1.5 kV AC, 1 minute (terminal to case)


• Dimensions: ø104 × 150 mm (terminal width ~174 mm); Weight: 1.2 kg


• Case: Plastic with damage-resistant terminal block

Key Features

• Four-terminal design (sub-1 kΩ models) reduces lead resistance errors


• Copper wire connections and reversed-current averaging suppress thermal EMF


• Specific model accuracies: 2792A01 (0.001 Ω) ±100 ppm; 2792A06 (100 Ω) ±0.005%


• Low annual drift ensures long recalibration intervals


• Resistance change modeled by: Rₜ = R₂₀[1 + α₂₀(t − 20) + β(t − 20)²]

Typical Applications

• Resistance bridge calibration and verification


• Potentiometer reference standards


• Electrical metrology in standards laboratories


• Industrial precision resistance measurement traceability

Compatibility & Integration The 2792A connects to standard precision bridges, potentiometers, and multi-function calibrators requiring DC resistance references. Terminal construction supports both 4-wire (lower values) and 3-wire (higher values) measurement configurations.