Abstract
A 'round robin' exercise was carried out by the UK SPATE users' group to determine factors affecting the calibration of SPATE equipments. The participants separately measured, using their own SPATE equipments and calibration techniques on identical materials, SPATE output per unit range of principal stress sum. Even after known differences in factors such as system responsivity or test temperature have been allowed for, there is a considerable scatter (of the order of 20%) in the results obtained. The cause of this is not yet known. This variation causes SPATE calibration using material properties to be less reliable than calibration by 'known stress' methods.
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