Fluke 105B User Manual page 115

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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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