Patent ID: 8067943
Filing Date: 2011-11-29
Classification: G01R

Abstract:
1. A test apparatus that tests a device under test, comprising: a driver that outputs a signal to a transmission line that is to be connected to the device under test; a comparator that compares a level of the signal transmitted on the transmission line to a set reference level; a judging section that judges acceptability of the device under test based on a measurement result, obtained by the comparator, of a response signal from the device under test; and a response characteristic detecting section that, with an end of the transmission line on the device under test side connected to a prescribed potential, sequentially outputs a rising waveform and a falling waveform from the driver, and that detects a difference between a response time of the comparator for the rising waveform and a response time of the comparator for the falling waveform, based on measurement results, obtained by the comparator, of the waveforms and corresponding reflected waveforms, wherein the response characteristic detecting section calculates a difference between output characteristics of the rising waveform and the falling waveform output from the driver, based on the measurement results from the comparator of the waveforms and the corresponding reflected waveforms, and corrects a difference between the response times of the comparator based on the difference between the output characteristics.