The General Radio 1433 Series is a family of precision decade resistors used for precision measurement applications, as resistance standards, and as components in dc and audio-frequency impedance bridges. The series includes 36 models featuring 3 to 11 dials, providing exceptional accuracy, stability, and low zero resistance. It features dust-proof switches with solid silver contacts and relies on robust 0510 Decade-Resistance Units enclosed in aluminum shielding.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | None (Manual operation) |
| Display | None (Switch dial position indicators) |
Physical
| Parameter | Value |
|---|---|
| Power Supply | None (Passive device) |
Resistance Specifications
| Parameter | Value |
|---|---|
| Resistance Range | 1 mΩ to 111.11111111 MΩ (model dependent) |
| Number of Decades | 3 to 11 dials (model dependent) |
| Resolution | 0.001 Ω to 10 MΩ (model dependent) |
| Accuracy (≤1 MΩ steps) | ±(0.01% + 2 mΩ) |
| Accuracy (10 MΩ steps) | ±0.03% |
| Zero Resistance (≤1 MΩ decades) | <1 mΩ per decade at dc |
| Zero Resistance (10 MΩ decade) | ≈3 mΩ at dc |
| Zero Impedance | <0.001 Ω/decade at dc; 0.04 Ω/decade at 1 MHz |
Electrical Ratings
| Parameter | Value |
|---|---|
| Maximum Current (Per Decade) | 0.1 mA to 8 A (decade dependent) |
| Maximum Voltage (Per Step) | 8 mV to 1000 V (decade dependent) |
| Maximum Power Dissipation (Per Step) | 0.064 W to 0.64 W (decade dependent) |
| Maximum Voltage (Terminal to Case) | 2000 V peak |
AC and Frequency Characteristics
| Parameter | Value |
|---|---|
| Switch Capacitance | <1 pF between contacts |
| Zero Inductance (Lo) | 0.1 μH/decade + 0.2 μH |
Switch and Contact Characteristics
| Parameter | Value |
|---|---|
| Switch Type | Dust proof, long life switches |
Environmental and Calibration
| Parameter | Value |
|---|---|
| Reference Temperature for Accuracy | 23 °C |
| Calibration Traceability | Traceable to SI |
Options and Accessories
| Parameter | Value |
|---|---|
| Rack Mount Kit Option | Available |
Technology
| Parameter | Value |
|---|---|
| Resistor Construction (≤ 100 kΩ steps) | Precision wirewound |
| Resistor Construction (≥ 1 MΩ steps) | Metal film / oxide |
Performance
| Parameter | Value |
|---|---|
| Temperature Coefficient (100 Ω to 100 kΩ steps) | ±10 ppm/°C |
| Temperature Coefficient (10 Ω, 1 MΩ, 10 MΩ steps) | ±20 ppm/°C |
| Insulation Resistance (Terminals to Case) | ≥ 10^9 Ω |
Inputs & Outputs
| Parameter | Value |
|---|---|
| Terminal Type | Gold-plated tellurium-copper jack-top binding posts |
| Terminal Spacing | 19 mm (0.75 in) |
| Shielding/Ground | Separate ground terminal internally connected to the enclosure |
Mechanical
| Parameter | Value |
|---|---|
| Switch Life | > 1,000,000 operations |
Technology
Precision Decade Resistor
Applications
Precision measurements, resistance standards checking, dc and audio-frequency impedance bridges