Model 3442 Miniature Extensometers - 2 Pages

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Model 3442 Miniature Extensometers

Catalog excerpts

3442 Miniature / Low Profile Extensometers Small profile and ultra-light weight, these units are appropriate for testing small and delicate samples yet rugged enough for daily use on standard specimens. Ideal for strain measurement of wire specimens, sheet materials, and standard ASTM or ISO specimen geometries. Excellent for low and high cycle fatigue testing. Model 3442 with 6.0 mm gauge length, ±1.0 mm (±16.7% strain) measuring range, and suspension tether Model 3442 with 6.0 mm gauge length and +5.0 mm/-1.0 mm (+83%/-17% strain) measuring range Weighing as little as 8 grams, these miniature extensometers are designed to have very low operating force with minimal specimen influence. All use an improved version of Epsilon’s dual flexure design which makes them very rugged for their size. With a compact Model 3442 low-profile extensometer with gauge length pin module that is 15.2 mm (0.6 inches) high, they will fit in the limited space between grips that is typical with small test samples. Gauge lengths can be as short as 3 mm or as long as 50 mm. A newly designed gage setting pin and assembly allows the gauge length to be set accurately and repeatably to ASTM and ISO requirements for all gauge lengths. Reengineered quick attach wire forms provide simple and secure specimen attachment. Wire forms for round and flat specimens are included, as well as knife edges in flat, 3-point, and vee configurations. The wire forms may be removed to enable mounting using elastic bands or springs. A tethering attachment point provides fall protection and enables counterbalancing of the extensometer’s weight when testing delicate specimens. Model 3442 extensometers are strain gaged devices, making them compatible with any electronics designed for strain gaged transducers. Most often they are connected to a test machine controller, and Epsilon will equip the extensometer with a compatible connector wired to plug directly into the controller. For systems lacking the required electronics, Epsilon can provide a variety of solutions for signal conditioning and connection to data acquisition systems or other equipment. Extensometers for Composites Compression Testing Model 3442 with 25 mm gauge length testing carbon fiber tow See the Model 3442 extensometer videos Models 3542 and 3442 extensometers can be furnished to clip directly onto composites compression fixtures, such as for ASTM D695. These use specially made quick attach kit wire forms for the test fixture. Consult the factory for specifics. Also see the Model 3542 extensometer. Rubber band and spring attachment options included with Models 3442 and 3542 Visit our website at www.epsilontech.

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Features Ordering Information May be left on through specimen failure. Full bridge, 350 ohm strain gaged design for compatibility with nearly any test system. Model 3442 Available Versions: ANY combination of gauge length, measuring range and temperature range listed above is available, except as noted. The measuring range should not exceed the gauge length. Other configurations may be available with special order; please contact Epsilon to discuss your requirements. Standard units meet ASTM class B-1 requirements for accuracy for gauge lengths >6 mm and class B-2 for <5 mm. A test...

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