Applied Physics and Mathematics Annotation << Back On reducing the instrumental error of measurement of temperature fields of electrical and railway equipment Kudryavtsev I.E. Ovcharov I.V. When we measure the temperature fields of railway and electrical equipment, there are occasions when the studied area have angular sizes comparable to the spatial resolution of the camera. In this case, inevitably increases measurement accuracy. To reduce the error should measure the modulation transfer function (MTF) of the thermal imager and take it into account when processing the results of measurements. Measure the MTF comfortable using a test object having a set of heat radiating different spatial frequencies from zero to the maximum reproducible. This test object is created in the VEI. A theoretical and experimental study of different types of MTF measurement of thermal imagers is presented. Given the downturn has improved the accuracy of the MTF of thermal measurements on electrical installations. In high-precision thermal imagers thermography appropriate use of singleelement radiation detectors. An example is the domestic appliance IRTIS. Keywords: thermographic measurements, modulation transfer function, diagnosis, and monitoring. Contacts: E-mail: commers@vei.ru Pp. 03-08.