The Isotech 999 Medusa R blackbody source is a primary source in which radiation pyrometers can be calibrated. Specifically designed to accommodate black body fixed point cells, the Isotech 999 Medusa R blackbody source is the optimal choice for primary labs needing the highest levels of radiation measurement.
The temperature of the Isotech 999 Medusa R blackbody source’s cavity can be set to ±0.1°C over the temperature range 30 to 550°C. The controller reaches 550°C approximately 45 minutes from switch on. Also, the Isotech 999 Medusa R blackbody source’s cavity temperature, as measured by a radiation thermometer takes approximately 45 minutes to reach stability from switch on.
The Isotech 999 Medusa R blackbody source has a variation seen on the controller’s temperature indication over a 5 minute period of ±0.2°C. Similar variations were detected by a radiation thermometer looking into the cavity.
Using a portable radiation thermometer having a target diameter of 13mm, the 48mm target was surveyed. Maximum temperature differences of ±1°C were found for set temperatures in the range 100 to 500°C. Temperatures along the inner 200mm of the 285mm long cavity were measured at 400°C and 500°C, using a hand held fiber-optic radiation probe. Maximum temperature differences of ±4°C were found.
Large Fixed Point Cells can be fitted to the Isotech 999 Medusa R blackbody source to give small uncertainties suitable for Primary Standards.
