Charpy Impact Testing: Minimizing Hammer Changes
With the release of Instron’s latest MPX Motorized Pendulum Impact Testing System, we wanted to remove the need to swap hammers or have multiple systems in one lab. In order to achieve this, we had to address two areas: the resolution of the device and the method for changing hammer energies (weight).
The resolution of the latest encoder has been improved fourfold compared to the previous model. This enables the MPX to achieve far better resolution than had previously been possible with dial indicators or their digital predecessors. The MPX encoder delivers a resolution of 0.023J on a 450J system, this is compared to about 1-0.5J resolution on a dial indicator. This improved resolution translates to a usable limit down to 0.6 J to ASTM E23, the dial on the other hand has between 12.5J and 25J.