GenRad 1491 D, G Precision Decade Inductor IET LABS

The GenRad 1491 Decade Inductance Box is recognized as the most accurate commercially available decade inductor, offering exceptional precision and reliability in various applications. Below are the key features and specifications of the GenRad 1491:

GenRad 1491 D, G Precision Decade Inductor IET LABS :

1. Accuracy:
   • The GenRad 1491 achieves an accuracy as high as 0.8%, making it ideal for applications requiring precise inductance measurements.
2. Inductance Range:
   • Available in models with different step resolutions, the GenRad 1491 offers a maximum inductance of 11.11 H. The step resolution varies between models:
     • 1491D: 4 decades, with 1 mH per step.
     • 1491G: 5 decades, with 100 µH per step.
3. Shielded Toroidal Cores:
   • The inductor uses shielded toroidal cores to minimize mutual inductance and reduce the influence of external electromagnetic fields, ensuring consistent and accurate measurements.
4. Moisture-Sealed Construction:
   • The inductor is sealed against moisture to maintain long-term stability, making it suitable for a wide range of environmental conditions.
5. High-Q Factor:
   • With a Q factor of 200 and above, the GenRad 1491 provides high-quality performance, particularly at low frequencies, which is critical for applications in wave filters, equalizers, and tuned circuits.
6. Switching Mechanism:
   • The decade switch is built with high-quality ceramic stator and rotor members, and silver alloy contacts with positive wiping action, ensuring durability and reliability. The switch also features well-defined ball-and-socket detents for precise operation.

Applications:

• The GenRad 1491 series is highly versatile and can be used in a variety of applications, including wave filters, equalizers, oscillators, analyzers, and similar equipment. It is particularly valuable during the preliminary design stages, where the ability to vary circuit elements is necessary to determine optimum operating values.

Basic Specifications:

• Accuracy (Low Frequency, Low Signal Level):

  • Model 1491-D: 0.8% accuracy for inductances of 100 mH and 1 H.
  • Model 1491-G: 0.8% accuracy for inductances of 100 mH and 1 H, with 2% accuracy for lower inductance ranges.
• Maximum Voltage:
  • Rated for up to 500V rms, with a caution against using voltages above 150V due to the potential for destructive arcing if the switch is between detent positions.
• Zero Inductance:
  • Approximately 1 µH.

The GenRad 1491 Decade Inductor series is a reliable choice for professionals requiring high precision, stability, and quality in inductance measurement and circuit design applications.