  System compliances of two testing machines (Keysight T150 and Instron 3365)
were studied for the tensile testing of carbon nanotube (CNT) fibers. Due to
the different gripping methods, the T150's system compliance was nearly zero,
while that of the Instron was nonnegligible. By analyzing the data dispersion
with the Weibull theory, a safe gauge length of >10 mm was suggested for CNT
fibers. Therefore, a standard test procedure should involve the compliance
evaluation, choice of gauge length, and Weibull statistical analysis.
