Patent ID: 7902849

Claim:
A method, comprising: scanning a plurality of test structures on a wafer using a high current microscope of an electron beam inspection system, the high current microscope having a probe beam current greater than 1 μA, each of the plurality of test structures having a pad end and an end opposite the pad end, the first test structure being longer in one dimension than in a second dimension, and further having a conducting pad electrically connected to the structure at the pad end thereof, the conducting pad having a larger contiguous area than that of the first test structure and being sized sufficiently to allow the entire current of the probe beam to enter the first test structure and saturate a capacitance of the first test structure to the wafer; monitoring detected signals from the wafer during the scanning to detect electrical errors present in a first test structure of the plurality of test structures; upon detecting an electrical error, storing a position of the first test structure; operating a stage to bring the first test structure under a scan field of a second electron microscope of the electron beam inspection system; and localizing the electrical error using the second electron microscope.