a number normalized between 1.000 and 9.999. As a re-
sult, the digital load signal to the LOAD display and the
analog load signal to a recorder are both normalized
with respect to stress. This allows calibration of the re-
corder scale in terms of stress (normalized), with the full
scale value easily changed by selecting a % RANGE on
the Recorder Panel. When the normalized area value for
each additional specimen is entered, the recorder scale
remains calibrated. Thus, each specimen can easily be
compared as all plots are on the same stress scale.
Determining Stress Range
The stress range indicated by full scale on a recorder
chart may be determined from the following equation
Full Scale Stress = A.C.x
L.R.
A
where:
A.C. = Area Compensation value -
the normalized base number (mantissa)
of the specimen cross-sectional area.
L.R. = Load Range - in pounds (g or kg, N or
kN). Load range is determined by the
load cell in use and the % RANGE
selected on the Recorder Panel.
A = Cross-sectional Area (actual) of
specimen
EXAMPLE:
Assume a specimen has an Area = 0.075 in ; that a 100-
lb capacity load cell is installed; and a 10% RANGE has
Appendix A
Test Planning
Area Compensation
A-11
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