Accurate mechanical testing requires not only familiarity with measurement systems, but also some understanding of the planning, execution, and evaluation of experiments. Much experimental equipment is often “homemade,” especially in smaller companies where the high cost of specialized instruments cannot always be justified. If the designer of the “homemade” equipment does not carefully consider how the design functions under test conditions, then the stress vs. strain diagram may be in error.
ACCURACY, REPEATABILITY, RESOLUTION