Simulation of everyday use

After the exact time is set, the Calibre 36 models are moved with a rotating test device into different positions over the course of 24 hours. This makes it possible to simulate the day-to-day conditions of a watch worn on the wrist. The rate deviation tolerance is -2 to +6 seconds per day.

12-day monitoring of the rate (accuracy) in six positions

The rate performance test begins on the second day of the extended tested period and runs for 12 days. The daily rate is tested in six different positions – for example “dial side up”. The watch is tested in each position for two days. Mechanical watches are usually tested in five positions. With the Calibre 36 movement, Glashütte Original adds a sixth position – the “numeral 12 up” position.

Performance of the watch in the event of temperature fluctuations

The accuracy of mechanical watches can be affected by marked changes in temperature. As a consequence, starting on day 14 of the excellence test, a three-day temperature test is undertaken, during which the performance of the watches is tested at temperatures of 8°, 23° and 38° centigrade.

Resumption of the rate

This part of the test checks the rate stability. To this end the value is measured after the previous 16 days of testing and compared to the value at the outset. Then the overall running time is monitored for 5 days with the watch in the “dial up” position. For this test the tolerance value is a minimum of 100 hours of running time.

Water resistance and condensation test 

On the penultimate day of the test, the water resistance of the 5 bar watches is tested.To this end, both a positive and a negative pressure (over- and underpressure) are created under a vacuum bell. A number of watches are chosen at random and heated to 40-45° C, then splashed with a drop of water. Should there be any moisture in the watch, it will appear at this point in the form of condensation on the crystal.

Final aesthetic review

As a final step of the excellence test, the appearance and functionality of the watches are reviewed to ensure that the surfaces (case, polish and decorative finishes) are flawless and that the manual winding and crown functions are working properly.