Oil-Filled Standard Resistance
This model AR-1250 standard resistor is specifically designed for use as an external standard resistor in AC/DC thermometry bridges and ultra-precise thermometry instruments, and can also be utilized for resistance value transfer in electrical measurements. It employs a highly stable, oil-encapsulated metal foil resistor element. The unit is supplied only after undergoing temperature compensation, resistance value matching, and prolonged screening and aging processes. The product features an all-metal enclosure with a fully oil-filled internal cavity. This effectively isolates it from air, mitigates the impact of ambient temperature, and enhances its long-term (annual) resistance stability. The Type A model can achieve a stability better than 2 ppm per year, and does not require placement in a constant temperature oven or oil bath.
Specifications
| Nominal Value | 1Ω、 10Ω 、 25Ω 、 100Ω 、 1KΩ 、 10KΩ 、 100KΩ 、 1MΩ |
| Operating Temperature | 18°C ~ 28°C |
| Storage Temperature | 0°C ~ 45°C |
| Calibration Temperature | 23°C±0.5°C |
| Annual Stability | 1Ω、 10Ω:±3ppm(A)/±6ppm(B) |
| Temperature Coefficient | ±0.5ppm/°C |
| Max. Power Consumption | 1W |
| Dimensions | 130mm (5.1") x 105mm (4.1") x 82mm (302") |
| Net Weight | Approximately 1 kg (2.2 lb) |
Performance Table
| Nominal Value | 1Ω | 10Ω | 25Ω | 100Ω | 1KΩ | 10KΩ | 100KΩ | 1MΩ |
| Anuual Stability A | ±3ppm | ±3ppm | ±1.5ppm | ±1.5ppm | ±1.5ppm | ±1.5ppm(B) | ±3ppm | ±3ppm |
| Anuual Stability B | ±6ppm | ±6ppm | ±3ppm | ±3ppm | ±3ppm | ±3ppm | ±6ppm | ±6ppm |
| Factory Calibration(23°C) | ±5ppm | ±3ppm | ±3ppm | ±3ppm | ±3ppm | ±3ppm | ±5ppm | ±5ppm |
| Max. Current | 500mA | 100mA | 50mA | 20mA | 10mA | 3mA | 1mA | 0.1mA |