....Model 3560 Bi-Axial and
    Axial Averaging Extensometers ....

A single integral unit provides simultaneous averaged axial strain measurement and averaged lateral or transverse strain. Also available with averaged axial readings alone.

Ideally suited for testing anisotropic materials such as advanced composites as well as general purpose tests like determining Poisson’s ratio. The Model 3560 uses a design unique to Epsilon, where the knife edges remain parallel during the travel. This approach greatly reduces crosstalk between axes and allows use on round or flat specimens with equal ease. These extensometers are very easy to mount. Integral springs hold the unit on the test sample. The parallel multiple flexure design makes these units very durable.

The Model 3560-AVG reads axial strain only, as a single averaged output. It may also be supplied with two independent outputs, one measurement from each side of the specimen. This is most commonly done when an indication of specimen bending is desired. The second version, the Model 3560-BIA, includes both the averaged axial strain and the transverse strain. Again, this may also be configured as dual independent axial readings. This results in a 3 channel extensometer.


Knife edge mounting and parallel travel allow mounting on round or flat specimens. Much easier to mount than designs using conical points (especially on thin flat specimens and round ones).
High accuracy and minimal crosstalk between channel.
Works on wide range of specimen sizes, from 0.1 to 1 inch width or diameter (2.5 mm to 25 mm).
Includes high quality foam lined case and spare set of tool steel knife edges.
Multiple sets of dual flexures and mechanical stops allow testing through failure and provide a rugged unit.
Ultra-flexible cable, 8 ft (2.5 m) long as standard


Linearity: 0.15%
Crosstalk: less than 0.5%
Output: 2 to 4 mV/V, depending on model
Excitation: 10 VDC recommended, 15 VDC or VAC max
Temperature range: -40 to +100 C (-40 to +210 F) standard (others optional).
Shunt Calibration Modules available.

Model 3560 Available Versions:
ANY combination of gage length, travel and temperature range
listed below is available.

Gage Length:
10 mm 0.500 in.
25 mm 1.000 in.
50 mm 2.000 in.

Travel in Percent Strain:

± 5 ±0.5 mm (±0.025 in.)
± 10 ±1.0 mm (±0.05 in.)

example: 10% strain in a 50 mm gage length version
results in total measuring range of 5 mm.

Temperature Ranges:

Low: -265 to + 100 C (-450 to +210 F)
Standard: -40 to +100 C (-40 to +210 F)
High 1: -40 to +150 C (-40 to +300 F)
High 21: -40 to +175 C (-40 to +350 F)

1Short term use to +200 C (400 F) acceptable

For more information on calibration services or digital retrofits please contact us.



300 Buttertown Road
Emlenton, PA 16373
(724) 867-6664 or (800) 793-1870
FAX (724) 867-1346

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