Let's raise a forgotten topic... I couldn't find a newer topic about this Crest mode.
I recently purchased a BM789 and decided to use it to check my car battery. And at the same time I compared it with what the oscilloscope shows. This is what happened.

The result is more or less the same, but there is still a small difference.
Then I decided to conduct a small experiment at home with this scheme.

I manually closed and opened the switch shown in the diagram, simulating a voltage drop. The average value for several measurements in the Crest mode was 7.60 V. As a result, the relative error was approximately 4%.
