GW Instek GDS-1000A-U Series User Manual - Manual (Page 64)

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. MATH