The present invention relates to a method for measurement of optical rsp. electrical signal sequences and an eye diagram monitor for measurement and display of signal sequences with at least one threshold decision circuit 3 , at least one storage device 4 , and an analysis device 5. With the eye diagram monitor in accordance with the present invention the generation of an eye diagram 1 is possible even at very high transmission data rates which is accomplished by at least one counter 6 , a signal sequence S fed to an input 7 of the threshold decision circuit 3 , an adjustable threshold value SW fed to the other input 8 of the threshold decision circuit 3 , and the output 9 of the threshold decision circuit 3 connected with the input 10 of counter 6.
Method for measurement of optical or electrical signal sequences and eye diagram monitor for measurement and display of signal sequences