Area Compensation
Area Compensation is a feature of the Series 4400 sys-
tem that allows the load signal to be calibrated in terms
of stress (Load/Area). Thus, specimens of similar mate-
rial but different cross-sectional area can be tested and a
relationship established between the applied force and
the specimen size. Appendix A, Introduction to Testing,
contains a description of area compensation.
A Series 4400 system accepts values of area compensa-
tion ranging from 9.999 x 10
-50
minimum to 9.999 x
1050 maximum. The default value is 1.000 x 10
0
, as ex-
pressed in scientific notation. However, you enter the ac-
tual number through the keypad using floating point
format with values ranging between 9.999E-50 to
9.999E50. The default value is 1.000E00 in this format.
An area compensation value is entered by two key se-
quences. The initial sequence enters a base number, or
mantissa, between 1.000 and 9.999. This number is the
normalized value of the specimen cross-sectional area.
EXAMPLE:
Specimen cross-sectional area:
A = 0.156 in
2
= 1.56 x 10
-1
Enter 1.56 (normalized value) as the mantissa.
After the first key sequence, the letter “E” and two digits
appear on the display; this is the current exponent (power
of 10) of the area value stored in nonvolatile memory. The
second key sequence enters the exponent of the area value
in the form of two digits ranging from -50 to 50, where the
absence of the “+” sign denotes a positive number.
Area Compensation M10-94400-1
5-38
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