113
FFT
FFT is used to compute the fast Fourier transform of channel input. FFT takes the digitized time
record of the specified source and transforms it to the frequency domain. When the FFT function is
selected, the FFT spectrum is plotted on the oscilloscope display as magnitude in dBV versus frequency.
The readout for the horizontal axis changes from time to frequency (Hertz) and the vertical readout
changes from V to dB.
FFT operation is useful when:
u
Measuring harmonic components and distortion in the device under test
u
Measuring the characteristics of the noise in DC power
u
Analyzing vibration
To display a FFT waveform:
1.
Press
Shift
and
Measure
on the front panel to open the MATH function menu.
2.
Press the
Operator
F key and then turn the
Universal Knob
to select
FFT
. The resulting math
waveform is displayed in pink and labeled with “M”.
Figure 64 FFT Menu
3.
Press the
Source
F key, and then turn the
Universal Knob
to select the source to do FFT operation.
Analog channels can be used as the source.
4.
Press the
Config
F key to enter CONFIG menu.
Figure 65 FFT CONFIG Menu
l
Press the
Maximum points
F key, and then turn the
Universal Knob
to select the Maximum
points.
l
Press the
Window
F key, and then turn the
Universal Knob
to select an appropriate window.
Spectral leakage can be considerably decreased when a window function is used. The
oscilloscope provides five windows (Rectangle, Blackman, Hanning, Hamming and Flattop)
which have different characteristics and are applicable to measure different waveforms. You
need to select the window function according to different waveforms and their
characteristics. Please read the table below carefully to choose an appropriate option
according to the input signal.
Summary of Contents for OSC-9200
Page 1: ...AEGIS Shaft Voltage Tester Handheld Digital Oscilloscope AEGIS OSC 9200...
Page 18: ...3 Appearance and Dimensions mm Figure 1 Front View Figure 2 Side view...
Page 44: ...29 Horizontal Control Contents u Horizontal Scale u Horizontal Delay u Roll Mode u Zoom Mode...
Page 56: ...41 Figure 16 x Interpolation Figure 17 Sinx x Interpolation...
Page 60: ...45 Figure 21 With Random Noise Normal Mode Figure 22 With Random Noise Average Mode...
Page 105: ...90...
Page 135: ...120 Figure 75 Integral with Offset...
Page 139: ...124 Figure 77 Measure Pulse Width...
Page 190: ...175 DC Current Measurement AC Current Measurement...
