User Manual

78
6 Math Functions
The 2540C Series oscilloscopes support math operations between the analog channels and
reference waveforms, including addition ( + ), subtraction ( - ), multiplication ( * ), division ( / ),
FFT, differentiation ( d/dt ), integration (∫dt), and taking the square root (√). The resulting math
waveform is displayed in white and labeled with the letter M at the left of the screen.
6.1 Math Operations and Their Units
Use the channel function menu (page 2) to set the unit of each channel to V or A. The
oscilloscope’s math operations are:
Math Operation
Symbol
Unit
Addition or subtraction
+ or -
V, A
Multiplication
*
V
∧
2, A
∧
2 or W (Volt-Amp)
Division
/
Ω, S, or None
FFT
FFT
dBVrms, Vrms, dBArms, Arms
Differentiation
d/dt
V/s or A/s
Integration
∫dt
Vs or As
Square root
√
sqr(V) or sqr(A)
Addition, subtraction, multiplication, and division require two waveforms. FFT, differentiation,
integration, and taking the square root operate on a single waveform.
6.2 Addition and Subtraction
When you select addition or subtraction, The Source A and Source B values are added or
subtracted point-by-point and the result is displayed.
1. Press the Math button to enter the MATH menu.
2. Press the Operation softkey and turn the Universal Knob to select + or -.
3. Press the Source A and Source B softkeys and use the Universal Knob to select the two
sources to add or subtract. The analog channels and the reference waveforms (REF) can be
used as sources.
4. The Invert softkey is available to invert the result.
5. Press the Scale softkey and turn the Universal Knob to scale the V/div.
6. Press the Position softkey and turn the Universal Knob to move the result’s vertical position.
Note: If the analog channels used with the math function are truncated (waveforms do not display
on the screen completely), the resulting math waveform will also be truncated.