  Thermoelectric power sensors can now be used as transfer standards, instead
of bolometers, in the microcalorimeter technique. This alternative has the
technical advantages to be less sensitive to absolute temperature and not
downward frequency limited. At INRiM the high frequency power standards are now
based on coaxial thermocouples from dc to 34 GHz. Modified commercial
thermocouple mounts in 7 mm and 3.5 mm coaxial line are used to realize the
national power standard with an accuracy ranging from 0.03 % to 1 % in the
mentioned frequency range.
