76 Keysight InfiniiVision 3000 X-Series Oscilloscopes User's Guide
4 Math Waveforms
A scale unit of U (undefined) will be displayed for math functions when two source
channels are used and they are set to dissimilar units and the combination of units
cannot be resolved.
Math Operators
Math operators perform arithmetic operations (like add, subtract, or multiply) on
analog input channels.
• "Add or Subtract" on page 76
• "Multiply or Divide" on page 77
Add or Subtract
When you select add or subtract, the Source 1 and Source 2 values are added or
subtracted point by point, and the result is displayed.
You can use subtract to make a differential measurement or to compare two
waveforms.
If your waveforms' DC offsets are larger than the dynamic range of the
oscilloscope's input channels you will need to use a differential probe instead.
Math function Units
add or subtract V or A
multiply
V
2
, A
2
, or W (Volt-Amp)
d/dt V/s or A/s (V/second or A/second)
 dt
Vs or As (V-seconds or A-seconds)
FFT dB* (decibels). See also "FFT Units" on
page 88.
√(square root)
V
1/2
, A
1/2
, or W
1/2
(Volt-Amp)
* When the FFT source is channel 1, 2, 3 or 4, FFT units will be displayed in dBV when channel units
is set to Volts and channel impedance is set to 1 MΩ. FFT units will be displayed in dBm when
channel units is set to Volts and channel impedance is set to 50
Ω. FFT units will be displayed as dB
for all other FFT sources or when a source channel's units has been set to Amps.
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