Thanks for your answers. You said that ±40V are generated from ±50 V with 10V difference. Does this mean that I can use for example a simplest voltage deviders (resistors 2 KOhms and 10 KOhms ?) on ±50V in order to generate a ±40V? Or I have to build completely separate power supply for ±40V? And what is current consumption on the ±40V?
Thanks