Patent ID: 6829553
Filing Date: 2004-12-07
Classification: G01R

Abstract:
A method of determining the correctness of the calibration of an automatic test arrangement testing a device, the automatic test arrangement including a tester driver, a pin electronics card having an input connected to the tester driver and an output connected to a first output pin, and a tester interface unit having an input connected to the first output pin and an output connected to a second output pin, said method comprising with the second output pin connected to the device under test, determining a first electrical length from the tester driver to a grounding point of the device under test; with no connection to the second output pin, determining a second electrical length from the tester driver to the tester interface unit output; with the second output pin connected to ground by a shorting block, determining a third electrical length from the tester driver to the ground; determining as a first difference value the difference between the first electrical length and the second electrical length; determining as a second difference value the difference between the first electrical length and the third electrical length; determining as a third difference value the difference between the first difference value and the second difference value; and evaluating the third difference value to determine the correctness of the calibration of the automatic test arrangement.