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OCR for page 38
38 IPC equipment moved the gauge points apart at high tem- 4.3 Manufacturer Modifications peratures. IPC designed a set of springs to counter the LVDT Each manufacturer made modifications to their equipment spring force. With these springs, the IPC specimen-mounted during the ruggedness and equipment effects experiments. deformation measuring system can be used to higher tem- The ITC equipment could not accurately control the loading peratures without experiencing the gauge point drift problem. rate for the 0.01 Hz tests at high temperatures. ITC modified Finally poor performance of the specimen-mounted deforma- the control software to use a different control algorithm for tion measuring system for the MDTS equipment resulted in low frequency loading. The spring force in the LVDTs of the complete redesign of this component of the equipment.