The IET/General Radio 1433-20 is a precision decade resistor providing stable, highly accurate resistance values from 1 mΩ to 111.11111111 MΩ. Engineered for laboratory and industrial calibration, testing, and circuit design applications, the 1433-20 delivers 0.01% accuracy with six selectable dials and 0.01 Ω/step resolution. Its gold-plated tellurium-copper binding posts, low zero resistance, and excellent frequency characteristics make it suitable for DC through RF measurements.
## Technical Specifications
• **Resistance Range:** 1 mΩ to 111.11111111 MΩ
• **Total Resistance (1433-20):** 11.1111 kΩ
• **Resolution:** 0.01 Ω/step
• **Accuracy:** 0.01% (up to 10 MΩ)
• **Number of Dials:** 6
• **Temperature Coefficient:** <10 ppm/°C (values above 100 Ω); 20 ppm/°C (100 Ω and below, room temperature)
• **Zero Resistance:** <0.001 Ω/decade DC; ~0.04 Ω/dial at 1 MHz
• **Inductance (Lo):** 0.1 µH/decade + 0.2 µH
• **Shunt Capacitance:** 15–20 pF/decade (low terminal to shield); 0–20 pF greater when shield tied to switch or zero end
• **Maximum Current:** 8 A per decade (1 mΩ and 10 mΩ decades)
• **Voltage to Case:** Maximum 2000 V
• **Switch Capacitance:** <1 pF
## Key Features
• Three-terminal configuration: high (H), low (L), and guard/shield (G)
• Gold-plated binding posts, 3/4 inch spacing
• Shorting link included
• Low, stable zero resistance across frequency
• Minimal residual reactance
• Long-term stability
## Typical Applications
• Precision impedance measurement and calibration
• RF circuit characterization
• Bridge and meter calibration
• AC and DC resistance standards
## Compatibility & Integration
Rear outputs and Kelvin connections available as options [-K Option]. Two-terminal or three-terminal operation supported via guard terminal configuration.
