Calibrations (IMAGE) U.S. National Science Foundation Caption A researcher performs calibrations on the Sandia Lightning Simulator, which allows test objects to be subjected to severe levels of simulated lightning currents. Credit Sandia Labs Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.