Abstract: A unit having differing thermal emissivities at differing regions thereof is monitored with an infrared camera for deriving a signal having magnitudes representing infrared emission from multiple pixels in the camera field of view. A computer responsive to the signal (a) stores data representing emissivity and standard temperature of the unit at each of the pixels, (b) combines indications of the infrared emission from each pixel and the stored data representing emissivity of each pixel to derive an indication of monitored temperature of each pixel, (c) compares the stored data representing standard temperature of each pixel and the indications of monitored temperature of each pixel, and (d) derives an indication of the deviation between the magnitude of the standard temperature and monitored temperature at each pixel. In response to the indication of the deviation at each pixel, a property of the unit related to the deviations at the pixels is derived.

Abstract: A fixture for securing a plurality of circuit boards during vibratory testing is shown, wherein the fixture comprises a first end fixture member having a first wall surface, and a second end fixture member space from the first end fixture member. The second end fixture member has a second wall surface facing the first wall surface, and the first and second end fixture members are relatively movable so as to very the spacing therebetween. Each of the first and second wall surfaces includes a plurality of spaced parallel notches for securing the opposite edges of a circuit board, and each of the notches is to have resilient characteristics to accommodate dimensional variations between similar circuit boards and an included angle in a range of 110.degree. to 130.degree. in order to secure a circuit board so that it is free to vibrate in a free-free manner during the vibratory testing.