Comparison of the units of resistance maintained at the national metrological laboratory, is traditionnally performed by transportation of standard resistors in the airoplane. Changes of standard resistors due to variation of temperature and pressure during transportation increases the time and the uncertainty of such intercomparisons.
It should be possible to avoid these problems by maintaining the standards in an enclosure which provides stable temperature during transportation and calibration. Such enclosure for the 100 ohms standard (Tinsley) was developed at VTT and used in 1997-1998 in the calibration of that standard against the quantum Hall resistance.
The aim of this intercomparison is to test the behavior of such a transfer standard in practice and to check possible systematic errors.