User manual

58
Math Operations
The Math operations can add, subtract, or perform FFT on the input waveforms. The resulted
waveform can be measured using the cursors, and saved or recalled just like normal input signals.
Overview
Addition (+) Adds the amplitude of CH1 & CH2 signals.
Subtraction (–) Extracts the amplitude difference between CH1 & CH2.
FFT Performs a FFT calculation on a signal. Four types of FFT windows are available:
Hanning, Flattop, Rectangular, and Blackman.
Hanning FFT
window
Frequency resolution Good
Amplitude resolution Not good
Suitable for.... Frequency measurement on
periodic waveforms
Flattop FFT
window
Frequency resolution Not good
Amplitude resolution Good
Suitable for.... Amplitude measurement on
periodic waveforms
Rectangular
FFT window
Frequency resolution Very good
Amplitude resolution Bad
Suitable for.... Single-shot phenomenon
(this mode is the same as
having no window at all)
Blackman FFT
window
Frequency resolution Bad
Amplitude resolution Very good
Suitable for.... Amplitude measurement on
periodic waveforms