Not more than 5 min before the commencement of the test,
the initial temperatures recorded by all thermocouples should be checked
to ensure consistency and the datum values should be noted. Similar
datum values should be obtained for deformation, and the initial condition
of the test specimen should be noted.
At the time of the test, the initial average internal temperature
and unexposed surface temperature of the specimen should be 20 ±
10°C and should be within 5°C of the initial ambient temperature.