Patent ID: 6960920
Filing Date: 2005-11-01
Classification: G01R

Abstract:
1. A method of correcting a measurement error in which when electrical characteristics of an electronic component under test having a plurality of ports are measured using a test instrument with the electronic component under test mounted on a production test fixture, a production test fixture measurement value of the electronic component under test using the production test fixture is corrected to electrical characteristics that are assumed to be obtained when one of the test instrument and another test instrument considered equivalent to the test instrument in measurement performance characteristic measures the electronic component under test in the mounted state thereof on a standard test fixture that results in a measurement result of electrical characteristic of the electronic component different from the measurement result of electrical characteristic of the electronic component provided by the production test fixture, the method comprising: preparing at least three correction data acquisition specimens different in electrical characteristics and having an extremely small transmission coefficient between ports thereof; acquiring a standard test fixture measurement value of the correction data acquisition specimens by measuring electrical characteristics of the correction data acquisition specimens in the mounted state thereof on the standard test fixture using one of the test instrument and the another test instrument; acquiring a production test fixture measurement value of the correction data acquisition specimens by measuring electrical characteristics of the correction data acquisition specimens in the mounted state thereof on the production test fixture using one of the test instrument and the another test instrument; identifying an error factor of a relative correction adapter from the standard test fixture measurement value and the production test fixture measurement value of the correction data acquisition specimens, wherein the relative correction adapter is modeled as including a two-port network connected to ports of the production test fixture adjacent to the test instrument, and as having a characteristic that modifies the electrical characteristics generated by the production test fixture having the electronic component under test mounted thereon into the electrical characteristics generated by the standard test fixture having the electronic component under test mounted thereon; acquiring a production test fixture measurement value of the electronic component under test by measuring the electronic component under test in the mounted state thereof on the production test fixture using one of the test instrument and the another test instrument; and calculating a standard test fixture measurement value of the electronic component under test which is assumed to be obtained when one of the test instrument and the another test instrument measures the electronic component under test in the mounted state thereof on the standard test fixture, by correcting the production test fixture measurement value of the electronic component under test with the error factor of the relative correction adapter; and wherein the step of identifying the error factor of the relative correction adapter is performed in accordance with the following equation: where C