Experimental pretest survey-a new technique for determining EMP/lightning test points

Abstract

Experimental pretest survey uses a short, simple, preliminary measurement program to find and characterize the significant points of entry and coupling paths through the shielding topology surfaces to obtain an initial estimate of the upset threshold distribution. Shielding topology is characterized at one or a few frequencies using continuous wave (CW) excitation and simple measurement apparatus. The random repetitive square-wave pulse generator (R/sup 2/SPG) technique is used to obtain an initial upset threshold distribution. It is shown how several techniques, such as single point excitation for hardness surveillance (SPEHS), hardness surveillance illuminator (HSI) and R/sup 2/SPG, can be used to guide the test planner towards a successful test. By investing a few days in an experimental pretest survey, the test planner gets a set of transfer functions that allows test points to be selected and prioritized with increased confidence.<>