Patent ID: 8866503

Claim:
A method for correcting a first inclination of a wafer chuck which occurs when electrical characteristics of a plurality of semiconductor chips of a semiconductor wafer are tested by bringing the semiconductor wafer held by the wafer chuck into electrical contact with a multiplicity of probes of a probe card at least once, the probe card having a size which covers substantially all the semiconductor chips, the method comprising the steps of: (a) measuring first displacements for each of the semiconductor chips by applying a load to each of the semiconductor chips and storing the first displacements in a data storage unit; (b) calculating a contact load of each of the semiconductor chips occurring when the semiconductor wafer comes into electrical contact with the probes; (c) calculating second displacements of each of the semiconductor chips based on the first displacements and the contact load of a corresponding semiconductor chip and storing the second displacements as a correction amount of each of the semiconductor chips in the data storage unit; (d) overdriving the wafer chuck to render the probes to make electrical contact with at least a part of the semiconductor chips; (e) obtaining correction amounts of semiconductor chips which contact with the probes of the probe card having the size which covers substantially all the semiconductor chips by said overdriving and calculating a total correction amount by adding the obtained correction amounts; and (f) correcting the first inclination of the wafer chuck prior to a measurement of the electrical characteristics of substantially all the semiconductor chips to arrive at a second inclination by adjusting an incline of the wafer chuck based on the total correction amount obtained by adding the obtained correction amounts.