Fluke 91 Series II User Manual page 157

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The voltage at the left cursor is about 400 mV. Remember
that this waveform is DC coupled, so you are measuring
the absolute DC value. Note that the ground is marked by
the " " indicator. To make absolute DC measurements,
such as Vrms, Vmean, Vmax peak, Vmin peak, V at LEFT,
or V at RIGHT, you must always use DC input coupling.
To make measurements referenced to certain waveform
levels, first locate the cursors on the two levels (use the
present positions):
17. Press and you will see that "ZERO
activated (highlighted).
The dV readout now changes to 0.00
cursor to the right:
18. Press
You should have the same value for both cursor readouts
because the absolute voltage change is the same for both
functions. To see this as a % change:
19. Press
∆
The dV readout is about 50% because you moved the left
" is
cursor halfway up the slope. Its reference points were the
top and bottom of the slope.
91/92/96/99/105
∆
V. Move the left
until it is about halfway up the slope.
and "%" is activated (highlighted).
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