Error rate measuring device and error rate measuring method

摘要

PROBLEM TO BE SOLVED: To provide an error rate measuring device and an error rate measuring method capable of providing information for identifying a cause of a problem when a multilevel modulation signal output from a test object has a problem. SOLUTION: A PAM decoder 21 for separating a PAM4 signal from a DUT 200 into MSB and LSB bit string signals, a level measuring unit 22 for measuring the levels of the MSB and LSB bit string signals separated by the PAM decoder 21, respectively, and a level. Between the bit rate signals of MSB and LSB based on the measurement result by the level measurement section 22, and the error rate calculation section 23 that calculates the BER of the MSB and LSB bit sequence signals respectively based on the measurement result by the measurement section 22. A bit shift amount calculation unit 24 that calculates the bit shift amount, a BER calculated by the error rate calculation unit 23, and a display unit 30 that displays the bit shift amount calculated by the bit shift amount calculation unit 24 are provided. .. [Selection diagram] Figure 1