EZ Digital DS-1000 Series, Operation Manual

Page: 60 / 67

The FFT math waveform vertical scale is dBV
RMS
, which is dB relative
to 1 V
RMS
(0 dB = 1 V
RMS
).
1. Push the math menu button
2. Push the menu button of the advanced function to select FFT.
3. Select FFT source channel
4. Select FFT window (Rectangular, Hamming, Hanning)
-
window
- type
- window
5. Push the menu button of stop
Rectangular Best window for resolving frequencies but worst for
accurately measuring the amplitude of those frequencies.
Best for measuring the frequency spectrum of nonrepetitive signals
and measuring frequency components near DC.
Hamming Very good for resolving frequencies with somewhat
improved amplitude accuracy over the rectangular window.
Hanning Very good for measuring amplitude accuracy but
degraded for resolving frequencies.
Procedure of Using FFT
59