Decade Resistance Boxes 2793 #279303

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).

  • Up to 100MΩ in 100Ω stop
  • Low voltage coefficient
    Variation of the resistance value is less than ±0.1% at 1MΩ and 10MΩ steps against 100V application, and less than ±0.04% at 100Ω 1Ω 10Ω, and 100Ω flaps against 10V application.
  • Shock and vibration proof construction
  • Easy-to-read in line indication
  • Best suited for calibration of insulation resistance testers and bridges



Dielectric Strength 2,500 AC for one minute between Panel and Circuit
Insulation Resistance More then 1011Ω at 1,000V 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. 5.3kg
11.7 lbs
Resistance Range 0 to 1,111.110Ω
Dial Composition 100Ω x 10 + 1kΩ x 10 + 10kΩ x 10 + 100kΩ x 10 + 1MΩ x 10 + 10MΩ x 10
Resolution 100mΩ
Accuracy 100Ω, 1kΩ, 10kΩ, 100kΩ Steps - ±(0.05%+0.05Ω)
1 MΩ and 10MΩ Steps - ±0.2%
(At temperature 23 ±2°C, humidity below 75%, including residual resistance of approx. 0.05Ω).
Max. Allowable Input 100 Ω Step 100mA
1 Ω Step 30mA
10 Ω Step 10mA
100 Ω Step 3mA (100 to 600 kΩ)
    2000 V (700 kΩ to 1 MΩ)
1 Ω Step 2000 V
10 Ω Step 2000 V

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