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Isotech North America Temperature Controlled Fixed Resistor Model 456

Description
By temperature controlling an otherwise very stable resistor, a performance close to the very best available in the world can be achieved at a surprisingly low price. The resistor itself is oil filled and hermetically sealed. 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% and a resistance range from 5O to 3.3 MO 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±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 a LED shows when the temperature has been reached. A test pocket is provided so that the resistors' temperature can be monitored if required. 0.1 ppm/month or better stability can be expected. We can supply the value you choose ±0.1% between a minimum of 5O and a maximum of 3.3 megaO. However we bulk buy and keep in stock the following standard values: 10W, 25W, 100W, 1000W, 10,000W. For the highest quality traceability we recommend that the 456 be UKAS Certified. We can offer the 2 Sigma Uncertainties shown in the table.

Suppliers

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Product
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Temperature Controlled Fixed Resistor - Model 456 - Isotech North America
Colchester, VT, USA
Temperature Controlled Fixed Resistor
Model 456
Temperature Controlled Fixed Resistor Model 456
By temperature controlling an otherwise very stable resistor, a performance close to the very best available in the world can be achieved at a surprisingly low price. The resistor itself is oil filled and hermetically sealed. 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% and a resistance range from 5O to 3.3 MO 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±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 a LED shows when the temperature has been reached. A test pocket is provided so that the resistors' temperature can be monitored if required. 0.1 ppm/month or better stability can be expected. We can supply the value you choose ±0.1% between a minimum of 5O and a maximum of 3.3 megaO. However we bulk buy and keep in stock the following standard values: 10W, 25W, 100W, 1000W, 10,000W. For the highest quality traceability we recommend that the 456 be UKAS Certified. We can offer the 2 Sigma Uncertainties shown in the table.

By temperature controlling an otherwise very stable resistor, a performance close to the very best available in the world can be achieved at a surprisingly low price. The resistor itself is oil filled and hermetically sealed. 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% and a resistance range from 5O to 3.3 MO 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±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 a LED shows when the temperature has been reached. A test pocket is provided so that the resistors' temperature can be monitored if required. 0.1 ppm/month or better stability can be expected. We can supply the value you choose ±0.1% between a minimum of 5O and a maximum of 3.3 megaO. However we bulk buy and keep in stock the following standard values: 10W, 25W, 100W, 1000W, 10,000W. For the highest quality traceability we recommend that the 456 be UKAS Certified. We can offer the 2 Sigma Uncertainties shown in the table.

Supplier's Site

Technical Specifications

  Isotech North America
Product Category Resistance Standards and Decades
Product Number Model 456
Product Name Temperature Controlled Fixed Resistor
Type Standard; Resistance; Oil Filled
Special Features Stand Alone or Bench; Suitable for AC Applications; Suitable for DC Applications
Temperature Coefficient 0.0 ±ppm/°C
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