Patent ID: 6225798
Filing Date: 2001-05-01
Classification: G01R

Abstract:
A semiconductor device testing apparatus comprising one tester part and one handler, wherein said handler has a first test station provided therein which conducts a primary measurement on semiconductor devices under test and a second test station provided therein which conducts a secondary measurement on semiconductor devices under test, and wherein said tester part waits, in case that the preparation of a test in the one test station is completed, till the preparation of a test in the other test station is completed within the limit of a maximum waiting time (Tmax), and if the preparation of a test in the other test station is completed within the maximum waiting time, performs the simultaneous measurements in both the test stations, and if not completed, performs the measurement only in the one test station,said semiconductor device testing apparatus being arranged such that in case that the preparation of a test in the first test station is completed and the preparation of a test in the second test station is not completed, the measurement is started only in the first test station without waiting for the completion of the preparation of a test in the second test station if there is no test tray in the second test station, and when there is a test tray in the second test station, the handler waits till the preparation of a test in the second test station is completed within the limit of the maximum waiting time (Tmax), and in case that the preparation of a test in the second test station is completed within the maximum waiting time, the simultaneous measurements are carried out in the first and the second test stations at the same time, and in case that the preparation of a test in the second test station is not completed, the measurement is started only in the first test station; andthat in case that the preparation of a test in the second test station is completed and the preparation of a test in the first test station is not completed, the measurement is started only in the second test station without waiting for the completion of the preparation of a test in the first test station if there is no test tray in a loader section or the first test station, and when there is a test tray in the loader section or the first test station, the handler waits till the preparation of a test in the first test station is completed within the limit of the maximum waiting time (Tmax), and in case that the preparation of a test in the first test station is completed within the maximum waiting time, the measurements are carried out in the first and the second test stations at the same time, and in case that the preparation of a test in the first test station is not completed, the measurement is started only in the second test station.