the invention relates to a rissfortschritts - gauge with a loading equipment, in which a sample einspannbar, and a test for unidirectional optical messgeraet. in the materialpruefung of samples is often the length of cracks, and to identify the rissfortschritt during a static load or a schwingbeanspruchung the sample to be measured.to determine the rissfortschrittes microscopic methods being used. this herkoemmliche measurement method for each individual measurement requires a considerable amount of time and beguenstigt arising from measurement errors.task of the invention is a rissfortschrittsmesseinrichtung of the above-mentioned type to create the objective and with great accuracy the relative extension of the sample with materialrissen and also with a very large speed works, so that the individual readings after a short time, and.can be electronically processed. for solution of this task is provided, the optical messgeraet a television camera which, to a diskriminator is connected to the pixels of the display, which in binaerimpulse transforms. the diskriminator is a binaerimpulse a host memory display is connected.a vergleicher provides the contents of the memory with the binaerimpulsen a subsequent display is compared. ...u.s.w
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