Figure 19. Automatic deadweight machine for testing weighing instruments up to 3 t. It is situated in the climatic chamber of Figure 7 and operates the weight stacks in Figure 3. A computer controls the machine and optimizes the configuration of the weights with respect to order and number. Figure 20. Digital compensator of type DMP 39 and HBM make is used to test strain-gauge load cells and to calibrate load cell simulators. The compensator in turn is calibrated at regular intervals against a 350 Ohms bridge standard of type BN 100, HBM make, linked to PTB standards of Division 2. Figure 21. Pneumatic endurance test assembly of size W×D×H = 1.1m×0.9m×1.4m and maximal load of 100 kg. Repetition cycle length is minimal 3, maximal 10 seconds. Down- and up-times are adjustable independently.