TC-Fixed-Resistors
By temperature controlling an otherwise very stable resistor a performance close to the very best available World-wide can be achieved at a surprisingly low price. The resistor itself is oil filled and hermetically sealed.
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The function of hermetic sealing is to eliminate the ingress of moisture and oxygen both of which play a role in the long term degradation of unsealed resistors. A further enhancement in both short and long term stability is achieved by oil filling. The oil also acts as a thermal conductor allowing the device to accept short periods of overload without degradation.
With accuracies of ±0.005%, a wide resistance range and long term drift of less than 5ppm, these devices are virtually secondary standards that can be kept in a laboratory as references to calibrate other devices.
The Resistor is held in a temperature controlled environment heated to 30°C ±0.1°C other temperatures are available to special order. The heater requires 2 watts at 5V which can be supplied by a battery or an unregulated DC supply. In an ambient of 20°C the Resistor’s heater will warm up in typically 30 minutes, and an LED shows when the temperature has been reached. A test pocket is provided so that the resistors’ temperature can be monitored if required.
Stability of 0.1 ppm/month or better can be expected. Standard models are: 10, 25, 100, 1000, 10,000Ω. For other values please contact Isotech.
For the highest quality traceability we recommend that the 456 be UKAS Certified. The 10, 25 & 100Ω models can be provided with a DC calibration to ±2ppm; the uncertainty for the 1000 and 10,000Ω versions is 12ppm; other options on request.
| Model | 456 |
|---|---|
| Rating | 0.5 Watt |
| Stability | Typically 1ppm per year at 1mA 10,000 Ohm 5ppm per year at 0.1mA |
| Temperature Coefficient 10,000 Ohms | < 0.3ppm |
| Traceability | A Traceability certificate accompanies your 456 to the 2 sigma uncertainties shown. |
| Induction | 0.08μH typical |
| Capacitance | 0.5pF |
| Dimensions | 114 x 110 x 96mm (in box) |
| Weight | 1kg (including box) 550g (excluding box) |
| How to order | 456 Temperature Controlled Fixed AC/DC Resistor. Please specify ohmic value. State with UKAS Calibration or without UKAS Calibration. |
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