As a result of many years development, Isothermal are now able to offer a temperature controlled Standard Resistor Maintenance Bath. Using Peltier heating/cooling modules, temperatures 20°C either side of ambient temperature may be set to a resolution 0.01°C.

Stability and temperature differences total less than ±0.015K when measured directly in the oil of the bath and ±0.003K when measured inside a Fixed Standard Resistor.

The bath will house several Resistors depending on their size and is ideal for measuring the temperature coefficients of Fixed Resistors, as well as maintaining them at a selected temperature.

The oil used in the bath is very special, it has to be very high resistance and very low viscosity. Wrong choice of oil will cause larger temperature gradients and may cause the motor to burn out.