The DB-33000E Series and DB-31000E Series consist of jitter meters which extract the 3T components from the RF signals of DVDs, and CD-Rs and measure the level of jitters in the 3T components. These jitter meters display sigma values of measured jitters on the meters and output the DC voltages corresponding to the jitter sigma values as well as the voltages corresponding to the time span of jitters before sigma processing through BNC connectors on the rear panel. These jitter meters have LEDs for indicating GO/NG judgment results of measured values. It is possible to set the threshold value for GO/NG judgment for each speed independently. This simplifies operations and improves the measurement efficiency. With these functions, the DB-33000E Series and DB- 31000E Series have a wide variety of applications including development and production lines.