Black body for calibration of the IR camera has been developed and manufactured. This relatively small device will be used inside an apparatus and serve as an internal temperature standard. The thermograms taken through KBr windows are affected by the non ideal KBr transparency and the black body known temperature provides necessary calibration standard. The black body can be heated as well as cooled by the means of a Peltier heat pump, which is in turn cooled by a cooling water. First results show behavior very similar to the commercial, much larger device. Authors of the design: Mařík, Haidl, Rejl. Special thanks to Štěpán Svoboda, SpektraVision.