Bernina 8 SERIES V29.39.00 - Manual (Page 11)

3.4 Thread tension can be changed to a minimum of 0.5
A new parameter controls the minimum thread tension range (between 0.0 - 1.0)
In the embroidery mode, the thread tension can be lowered to a minimum level of 0.5, instead of 1.0.
When decreasing the tension values to less than 1 a warning message appears.
After confirmation, the minimum tension of 0.5 can be set.
11/14, 04.11.2009