As soon as the heat-transfer fluid has reached the starting temperature, the specimens are inserted into the measuring stations and lowered (motor-driven) into the oil bath. In the next step the test weight specified in the standards is applied to type A1 instrument manually and to type A3 by motor drive and the test sequence is started by the PC software.
On completion of pre-heating under the influence of force, the displacement signals are zeroed (program-controlled) and the heating of the heat-transfer liquid at the previously set rate is started. As soon as the required deflection, outer-fiber strain or penetration is attained, the heating is switched off and the test is ended.
Re-cooling of the heat-transfer fluid is started automatically via a solenoid valve. The specimens can afterwards be removed.