The present invention relates to an antiglare apparatus having a self-diagnosis mode for preventing abnormal operation through the advance self-diagnosis of the working environment and operating conditions, wherein work convenience is improved by displaying the remaining battery power and the self-diagnosis is performed immediately through a one-touch input. The apparatus comprises: an optical detection means detecting the light generated by a welding and cutting torch an electromagnetic-wave sensor sensing electromagnetic waves generated by the welding and cutting torch a means for detecting electromagnetic waves whereby, when a signal operating the means for detecting electromagnetic waves is applied, a signal, which is to be resonated and which is inputted through the means for detecting electromagnetic waves, is compared with a reference value which is variably set a control means monitoring the change in electromagnetic waves inputted by the output of the means for detecting electromagnetic waves after applying the signal operating the means for detecting electromagnetic waves to the means for detecting electromagnetic waves by starting the detection of light in the optical detection means and a means for controlling light penetration, which controls the change in the light penetration ratio of the antiglare plate according to the output signal of the control means, wherein the apparatus is characterized by comprising a means for inputting a self-diagnosis order for recognizing a signal to verify the normal operation of a device, to check light-shading, to check sensitivity, and to check the degree of delay and the remaining battery power by a control of the user or by adjusting a direct selection inputted to the control means.La présente invention concerne un appareil antireflet qui possède un mode dautodiagnostic pour empêcher le fonctionnement anormal grâce à lautodiagnostic avancé de lenvironnement de fonctionnement et des conditions de fonctionnement. Dans
