Good or bad decision manner and automatic recognition evaluation mode null of code error factor of

摘要

PURPOSE:To automate measurement by automatically adjusting a light attenuator by a microcomputer and accurately plotting the measured data of a code error rate on standard error rate paper and automatically confirming the linearity of the measured data. CONSTITUTION:The beam power value of laser of an object 3 to be measured is measured and the beam transmitting code error rate of the object 3 to be measured corresponding to said beam power value is measured. The code error rate data signal (p) corresponding to the beam power outputted from an error rate measuring device 14 is taken in a microcomputer 1 to be accurately displayed on a measuring graph. The straight line passing through the error rate data in the lowest value of beam power and smallest in inclination on the basis of this points is calculated. It is judged whether the arrangement of the remaining measured data not riding on a straight line excepting the code error rate data used in the calculation of the straight line becoming min. in inclination and a reference point has linearity on the basis of the straight line min. in inclination.