B&K Precision 8540 - Manual - Manual (Page 11)

OFF, which means the display will show
your set value on the top display while
you make adjustments. It will then blink
for 2 seconds before toggling the display
to show measured voltage. If users want
to adjust the set value using knob while
see the measured voltage and current
simultaneously without interruption,
select ON.
A B C D
V Short CV
W
30A CR
A OFF Shift