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2793 Decade Resistance Box
Brand: Yokogawa
Model 2793 resistance box is high-accuracy, stable DC variable resistor with 6 dials and is available in two styles: 279301 for medium resistance from 0.1 to 1,111.210 Ω in 1 mΩ steps (best suited for calibration of resistance thermometers or bridges); 279303 for high resistance from 0 to 111.1110 MΩ in 100 Ω steps (suitable for calibration of insulation resistance testers or bridges).
Features- High accuracy and stability
- High reproducibility
- Excellent reproducibility is obtainable because dial switches with low contact resistance are used. For example, changes in contact resistance is within ± 1.1mΩ at 0.1Ω setting.
- 1 mΩ resolution
- Simple, quick dial operation
- In-line display for city reading
- Ideal for calibration of resistance thermometers and brides
- Due to its high accuracy and a dial system, various types of resistance thermometers and bridges can be calibrated accurately and promptly.
- Excellent anti shock and -vibration properties
Specifications
Brand
Accuracy
- (± 0.05% + 0.05 ohm) at 23° ± 2° C (73.4° ± 3.6° F) - 279303
- ± (0.01% + 2 MegaOhms) at 23° ± 2° C (73.4° ± 3.6° F) - 279301
- ± 0.2% at 23° ± 2° C (73.4° ± 3.6° F) - 279303 (1 MegaOhm & 10 MegaOhms Steps)
Current
- 1.5 A (0.1 ohm Steps) - Maximum
- 150 mA (10 ohms Steps) - Maximum
- 50 mA (100 ohms Steps) - Maximum
- 500 mA (1 ohm Steps) - Maximum
Environmental Protection
- Shock-Proof - 279303
- Vibration-Proof - 279303
Humidity
- < 75% - 279303
- 45 to 75% - 279301
Input
- 10 mA (10 KiloOhms Step) - Maximum
- 100 mA (100 ohms Step) - Maximum
- 2,000 V (700 KiloOhms to 1 MegaOhm) (1 MegaOhm, 10 MegaOhms Step) - Maximum
- 3 mA (100 to 600 KiloOhms) (100 KiloOhms Step) - Maximum
- 30 mA (1 KiloOhms Step) - Maximum
Insulation Resistance
- > 10¹¹ ohms at 1,000 Vdc between Panel & Circuit - 279303
- > 500 MegaOhms at 500 Vdc between Panel & Circuit - 279301
Power
- 0.1 W Power Application - 279301
- 0.25 w/Step within 1 W - Maximum
Resistance
- 0 to 111.1110 MegaOhms - 279303
- Contact Resistance is within ± 1.1 MegaOhms at 0.1 ohm Setting - 279301
- Medium Resistance from 0.1 to 1,111.210 ohms in 1 MegaOhm Steps - 279301
Resolution
- 0.001 ohms - 279301
Supply Voltage
- 1,000 Vac for One Minute between Panel & Circuit - Dielectric Strength (279301)
- 2,500 Vac for One Minute between Panel & Circuit - Dielectric Strength (279303)
Temperature Coefficient
- 10 KiloOhms, 100 KiloOhms, 1 MegaOhm, 10 MegaOhms Step: ± 30 x 10⁻⁶ / °C - 279303
- α₂₀ = (-2 to 20) x 10⁻⁶ / °C for 100 ohms, 1 KiloOhm Step - 279303
- α₂₀ = (20 to 90) x 10⁻⁶ / °C Approximately for 1 ohm - 279301
- α₂₀ = (-5 to 10) x 10⁻⁶ / °C for 100 ohms Step - 279301
- α₂₀ = (-5 to 20) x 10⁻⁶ / °C for 10 ohms - 279301
- α₂₀ = (90 to 900) x 10⁻⁶ / °C Approximately for 0.1 ohm - 279301
- β = (-0.3 to -0.7) x 10⁻⁶ / °C² for 100 ohms, 1 KiloOhm Step - 279303
- β = (-0.3 to -0.7) x 10⁻⁶ / °C² for 100 ohms, 10 ohms Step - 279301
