The Class H uses a servo-motor drive to handle all pendulum movement, so the operator does not waste time on manual lifting. After the specimen is loaded and the door is closed, the motor brings the pendulum up to the preset starting angle within a few seconds. The starting angle can be set anywhere in the working range, and the system repeats that angle from test to test without drift.

Right after impact, the pendulum continues its swing, and the system calculates the absorbed energy. The machine then brings the pendulum back to a safe locked position automatically. In routine work, the time between pressing start and having the pendulum ready for the next specimen is very short, which keeps the line moving.

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