Patent ID: 8280667
Filing Date: 2012-10-02
Classification: G01R

Abstract:
1. A test apparatus that tests a device under test, comprising: a waveform generator that generates a test signal to be supplied to the device under test; a digitizer that measures a response signal output by the device under test; a judging section that judges acceptability of the device under test based on the measurement result of the digitizer; a loop-back path that connects an output terminal of the waveform generator to an input terminal of the digitizer when calibration is performed for the waveform generator and the digitizer, wherein the loop-back path includes: the test apparatus further comprising: a waveform generation control section that, when the digitizer is being calibrated, causes the waveform generator to output a prescribed reference signal and causes the prescribed reference signal to be input to the digitizer through the noise removal filter; a digitizer distortion identifying section that identifies non-linear distortion caused by the digitizer, based on a reference digital signal output by the digitizer according to the reference signal; and a digitizer signal compensating section that compensates the reference digital signal output by the digitizer according to the response signal from the device under test when the device under test is being tested, based on the non-linear distortion identified by the digitizer distortion identifying section.