Closed-loop tester systems provide unsurpassed performance reliability, stability, and flexibility when compared to dead weight-type hardness testers. Additionally, the components employed in a closed-loop system naturally lend themselves to a considerably simpler design than a dead-weight system, allowing it to continuously measure the test force applied. As was already established, in order for dead-weight systems to operate well, they need levers, pivots, and other parts that cause friction. The weights themselves are separated from the indenter, the only component of the system in touch with the test sample, by levers, pivots, etc.

For instance, the load cell won’t report the right force if the actuator’s friction is so high that the appropriate force is not applied to the indenter. As a result, the system will stop the test rather than output a false positive. In this approach, the system constantly verifies that it is only applying the appropriate test forces to the indenter. The feedback loop makes it simple to control the actuator’s mass.

NextGen’s BrinGen – 3000 Series – Digital Brinell and Automatic Brinell Hardness Tester is equipped with a closed loop system.

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