The present invention is based on the discovery that a diaphragm (DY) is mounted on a standard sialic (CRT) and the luminance of the sialic screen is detected to automatically adjust the size and position of the screen and the central convergence, and to automatically measure the amount of misconvergence and geometric distortion (DY) screen inspection apparatus comprising: a detector for detecting quantitatively a luminance of a sialic screen, the plurality of photosensors being installed on a front surface of a sialic screen; and a detector for detecting an output value from the detector, A pattern generator for generating an inspection pattern, a pattern generator for generating an inspection signal, a pattern synchronizing signal, and a vertical synchronizing signal of the pattern generated by the inspection pattern, The amount of misconvergence and geometric distortion are measured and displayed, the pattern generator controls to generate a uniform copper pattern, (CPM) control unit for outputting a constant current according to the first control signal of the main control unit, and a display control unit A power control unit for inputting a manual adjustment signal for manually adjusting a size and a position of the main control unit and for selecting either one of an input manual adjustment signal or a second control signal of the main control unit, And a dewar power unit for outputting the synchronization signal to the dewar and the tank gun according to the signal output from the power control unit.
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