I am trying to calibrate the bld pump speed on an H machine. When I compare it to the debug screen it is off by approx 20 and fluctuates The motor is new. I believe it is the board. When I called Fresenius they stated the speed and debug doesn't neccesarily have to match because the arterial pressure is factored into it. Is this true.

I swapped 3 bld pumps into 3 different machines and the numbers did not match up on any of them. They were close. Maybe your machines are just old. Do you have K machines. And if so. Compare them.