In order to increase the calibration capabilities of infrared thermometer, an extension to the non-contact temperature scale has been performed by the National Institute for Standards (NIS) using a LSBB for the low temperature range from − 30.0 to + 30.0 °C. A high emissivity cavity was developed as a temperature source for the infrared thermometers under calibration. A characterization had been performed and included studies of temperature stability, homogeneity, cavity bottom uniformity, efficiency, blackbody emissivity evaluation, determination of the source size, distance effect, the effect of reflected ambient radiation and the cavity bottom heat exchange. This study showed that NIS is capable of calibrating the secondary standards, establishing the metrological tractability and disseminating those calibration services. This calibration service is now accredited from the Egyptian Accreditation Council (EGAC) with uncertainty ranged from 0.4 to 0.5 °C.

为了提高红外温度计的校准能力，美国国家标准研究院 (NIS) 使用 LSBB 对 - 30.0 至 + 30.0 °C 的低温范围进行了非接触式温度范围的扩展。开发了一个高发射率腔作为校准红外温度计的温度源。已经进行了表征，包括温度稳定性、均匀性、腔底均匀性、效率、黑体发射率评估、源尺寸的确定、距离效应、反射环境辐射的影响和腔底热交换的研究。这项研究表明，NIS 能够校准二级标准，建立计量易处理性并传播这些校准服务。