Agilent Technologies 3000 Series, User'S And Service Manual, Page: 54 / 156

2 Displaying Data
54 Agilent 3000 Series Oscilloscopes User’s Guide
To add, subtract, or multiply waveforms
1
Press
Math
.
2
In the Math menu, press
Operate
to select:
• 1 + 2
• 1 - 2
• 1 x 2
3 To invert the result of the addition, subtraction, or multiplication (with
respect to the reference level), select
Invert to toggle between “ON” and
“OFF”.
To display the frequency domain using FFT
The FFT math function mathematically converts a time- domain waveform
into its frequency components. FFT waveforms are useful for finding the
harmonic content and distortion in systems, for characterizing noise in DC
power supplies, and for analyzing vibration.
To display a waveform’s FFT:
1
Press
Math
.
2
In the Math menu, press
Operate
until “FFT” is selected.
3
In the FFT menu, press
Source
until the desired input channel is
selected.
N O T E
The FFT of a waveform that has a DC component or offset can cause incorrect FFT
waveform magnitude values. To minimize the DC component, choose AC Coupling on the
source waveform.
To reduce random noise and aliasing components (in repetitive or single-shot waveforms),
set the oscilloscope acquisition mode to averaging.