78 Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide
5 Math Waveforms
Units for Math Waveforms
Units for each input channel can be set to Volts or Amps using the Units control in
the Probe dialog box. Units for math function waveforms are:
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.
Arithmetic Math Functions
Math operators perform arithmetic operations (like add, subtract, or multiply) on
analog input channels.
• "Add or Subtract" on page 79
• "Multiply or Divide" on page 79
Math Operating Hints
If the analog channel or math function is clipped (not fully displayed on screen) the resulting
displayed math function will also be clipped.
Once the function is displayed, the analog channel(s) may be turned off for better viewing of
the math waveform.
The math function waveform can be measured using markers and/or measurements.
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 72.
√(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 50Ω. 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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