User Manual

GDS-1000A-U Series User Manual
64
FFT RMS
Performs a FFT RMS calculation on a signal. RMS
is similar to FFT, however the amplitude is
calculated as RMS and not dB. 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
Adding, subtracting or multiplying signals
Procedure
1. Activate both CH1 and
CH2.
CH 1 CH 2
2. Press the Math key.
MA
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