testXpert The optional reduction in width monitors are designed for tensile tests on metals. They are mounted on the Macro extensometer and can be operated, selectively, manually or automatically via the test software

4.1.2 Universal extensometer „Macro“

Optional reduction-in-width monitors Range of application The Macro extensometer is a universal, high resolution extensometer for tensile, compression, flexure and cyclic tests on plastics, hard foam materials and metals that have low to average amounts of specimen strain. Sensor arms suitable for tests in temperature chambers are available from the Zwick range for use with this extensometer.
® .The change in width can be measured in 1,2 or 4 cross-section levels. Advantages of the Macro extensometer •Specimen deformation is recorded in the elastic andplastic deformation ranges during the entire tensile test up to specimen break.•The drag forces are extremely low. •The resolution and measurement accuracy isextremely high over the entire measurement range.•It’s also suitable for alternating load tests. •The extensometer can be combined with all analogueor incremental clip-on extensometers, as well as reduction-in-width monitors (Especially important for r- value determination of metals).•Can easily be integrated in systems for fully automatictests.•It fulfills accuracy grade 1 to EN ISO 9513. System description This multi-purpose extensometer is also characterised by its modular construction. Thus, for example, the manual operation extensometer can be converted to an automatic clamping extensometer.Furthermore, a range of optional units for expanding thefunctionality of the Macro extensometer is available: •Different basic models with resolutions up to 0.12 µm•Automatic L
Fig. 9: Universal extensometer „Macro“ Fig. 10: Macro extensometer in combination with a reduction inwidth monitor (With 4 measurement lines) -setting•Interface for the sensor arms •Different sensor arms for tensile, compression andflexure tests as well as for tests in temperature chambers•Different reduction-in-width monitors as well as a driveunit for them 14