Ohm Labs SmartResistor and Automated Resistance Standard

The Ohm Labs SmartResistor combines all the elements needed to maintain the unit of resistance in one transportable device: a set of standard resistors, a controlled temperature bath, a low thermal emf scanner and measurement data.

EIGHT RESISTANCE STANDARDS

To maintain and discriminate the Ohm, a laboratory must have a set of resistance standards and usually at decade values (1 Ω, 10 Ω, 100 Ω, etc.). The SmartResistor contains eight resistors. A typical model has eight decade values ranging from 1 Ω to 10 M Ω. However, any of the eight resistor values can be specified when ordering. Due to power and leakage limitations, the value must be between 0.1 Ω and 10 M Ω.

BATH WITH CONSTANT TEMPERATURE

Traditional resistance standards are usually held in an oil bath at a constant temperature: these baths are large, noisy and cannot be transported. The SmartResistor contains a constant temperature housing, which makes portability possible. The control circuit has sufficient power to cope with variations in ambient temperature. The nominal setting is 25.00 ° C. In normal chamber environments this constant temperature housing has a stability better than 10 mK.

IMMUNE TO THE ENVIRONMENT

The standards are hermetically sealed and therefore immune to changes in air pressure and relative humidity.

CHARACTERISATION OF THE STANDARDS

A resistance standard has no value without its characterization. These data include a reference value in ohms, coefficients of temperature, power coefficient, frequency range and drift over time. The SmartResistor’s internal computer maintains all this data and provides it to the user. The data is available for integration into automated systems.

CORRECTED FOR DRIFT

As time passes, the SmartResistor applies drift corrections to the displayed value. The SmartResistor software generates and maintains control cards for each of the eight standards.

LOW THERMAL EMF SCANNER

The 8-channel low-thermal emf scanner cards of the Ohm Labs SmartResistor are from DataProof, a world leader in scanner technology. This integrated scanner makes automated build ups. Each of the eight resistance standards is a choice of R1 or R2 on the front panel.

INTERNAL DATALOGGER

The SmartResistor includes a battery-powered temperature logger, which monitors and warns of exposure to potentially harmful extreme temperatures during storage or transportation.

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