4.6.1 Deformation measurements should be made
using equipment employing mechanical, optical or electrical techniques.
Instrumentation for the measurement of deflection of the test specimen
should be located so as to provide data in terms of the amount and
rate of deflection during the fire test.
4.6.2 The deformation data should be recorded
to an accuracy of ± 2 mm during the testing period.
4.6.3 For a bulkhead, measurement should be made
of the axial contraction and of the horizontal deflection.
4.6.4 For a deck, measurement should be made of
the vertical deflection.