Decade Resistance Boxes 2793 #279301

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).

  • 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


Dielectric Strength 1,000 V AC for one minute between Panel and Circuit
Insulation Resistance More than 500MΩ at 500V DC between panel and circuit
Dimension 497(W)×116(H)×140(D)mm, excluding protrusions
19.57 x 4.57 x 5.51 in.
Weight Approx. 4.8kg
10.6 lbs
Resistance Range 0.1mΩ to 1,111.2100Ω (minimum resistance is 0.1Ω)
Dial Composition 0.001Ω x 10 + 0.01Ω x 10 + 0.1Ω x 11 + 1Ω x 10 + 10Ω x 10 + 100Ω x 10
Resolution 1mΩ
Accuracy ±(0.01Ω + 2mΩ) at temperature of 23 ±2°C, humidity of 45 to 85%, and 0.1W Power Application
Max. Allowable Input Power 0.2SW/slep. Within 1W for overall instrument.
Max. Allowable Input Current 50mA (100Ω steps), 150mA (10Ω steps), 500mA (10 Ω steps) and 1.5A (0.1Ω steps)

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