Mikron has been designing and manufacturing blackbody sources since 1970. During the 1990's Mikron introduced 8 ultra-precision freezing point blackbody calibration sources as fixed point, primary calibration standards for the checking of transfer standards at discrete temperatures assignments from 29.76°C, the melting point of gallium, to 1084.62°C, the freezing point of copper. All the blackbody sources were compared with NIST equivalent blackbody sources and the temperature uncertainties were established. These precision instruments have been installed in several institutes responsible for maintaining radiance standards. During the last two years, Mikron has added additional high precision, but variable temperature, blackbody sources for producing ultra-accurate radiance standards. These new blackbody sources overcome the limitation of
freezing points that can produce only a single melt or freezing radiance standards. In all of the new blackbody sources very important criteria has been preserved. Flat and near flat unity of the emitter spectral emission response, the reconciliation of the measurement between radiometric and thermometric measurements to
achieve a high degree of precision and repeatability. The models, which will be introduced in this paper, are as follows: Model M300X, an ultra-precision blackbody source for temperature measurement from 50.00° to 1100.0°C; Model M350, a precision blackbody source, exclusively designed for calibration of wide incidence angle of heat
flux gauges, for temperatures of 300° to 1100°C corresponding to over 200KW/m2 of incidence radiance; and Model M345X12, an extended area blackbody source with Lambertian emitter and dimensions of 305X305 mm
for precision non-uniformity correction (NUC) and calibration of the wide-angle thermal imagers.