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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

1 - 2 of 2 Part Numbers
279301
279301
  • Resistance - 0.1 to 1,111.21 Ohms in 1 MilliOhm Steps
279303
279303
  • Resistance - 0 to 111.1110 MegaOhms in 100 Ohms Steps
1 - 2 of 2 Part Numbers

Specifications

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) - Max.
  • 150 mA (10 ohms Steps) - Max.
  • 50 mA (100 ohms Steps) - Max.
  • 500 mA (1 ohm Steps) - Max.

Environmental Protection

  • Shock-Proof - 279303
  • Vibration-Proof - 279303

Humidity

  • < 75 % - 279303
  • 45 to 75 % - 279301

Input

  • 10 mA (10 kiloohms Step) - Max.
  • 100 mA (100 ohms Step) - Max.
  • 2,000 V (700 kiloohms to 1 Megaohm) (1 Megaohm, 10 megaohms Step) - Max.
  • 3 mA (100 to 600 kiloohms) (100 kiloohms Step) - Max.
  • 30 mA (1 kiloohms Step) - Max.

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 - Max.

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)
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