General Description
1-3
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The initial gauge length of the particular
extensometer is accurately and conveniently
set by the insertion of a gauge length pin into
a hole precisely located in the flexural beam,
enhancing test repeatability and reducing the
possibility of damage to the extensometer
when not in use.
The extensometers are clamped to the flat or
round specimens with special high-tear
strength rubber bands or with tension
springs. Replaceable tool steel knife edges
attached to the ends of both the fixed and
flexural beams bear against the specimen and
prevent slippage. Although the clamping
force is low, positive positioning of the
extensometer on the specimen is assured
without generating high localised stresses
which can initiate fatigue cracks.
The extensometer can be quickly and easily
calibrated, the method varies depending on
the testing instrument and control console
being used. A full description of all
calibration procedures is detailed in a later
section of this manual. Refer to
“Calibration” on page 2-11
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