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 dual flexure design which makes them very rugged for their size. With a compact 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 ISO and ASTM 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.

Features

• May be left on through specimen failure

• All standard units meet existing ISO 9513, class 0,5 and ASTM class B-1 requirements for gauge lengths ≥6 mm and class 1 according to ISO 9513 and ASTM class B-2 for ≤5 mm accuracy.

• All models can measure in both tension and compression and can be used for cyclic testing.

• Gauge length pin helps set gauge length accurately for all gauge length configurations.

• Full bridge, 350 ohm strain gauged design

• Mechanical overtravel stops in both directions.

• Rugged, dual flexure design for strength and improved performance. Much stronger than single flexure designs, this also allows cyclic testing at higher frequencies.

• Gauge length adapter kits enable configuration of multiple gauge lengths with one extensometer.

• Replaceable arms and spacers for ease of repair.

• Hardened tool steel knife edges are easily replaced

• High and low temperature options extend operation from as low as -265 °C to +200 °C

• Replaceable arms and spacers for ease of repair. This also allows changing the gage length for different test requirements

• Includes high quality foam lined case