Fluke 91 Series II User Manual page 105

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Multiply Multiplies two waveforms (each sourced from
an active input or a memory location) and stores the result
in the next free waveform memory. For example, power can
be calculated with MULTIPLY if SOURCE1 represents the
voltage drop across a device and SOURCE 2 represents
current through that device. In the following Figure,
waveforms from Waveform 4 memory (upper) and INPUT A
(middle) are multiplied, resulting in the waveform stored in
Waveform 5 memory (lower).
Invert INVERT allows you to reverse the polarity on
an active input or memory waveform and store the new
waveform in another memory location.
Integrate This function calculates and displays the area
of the selected waveform. Integrate allows you to totalize
the waveform over a period of time, showing the real power
dissipation when the waveform changes levels.
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