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72
V5.1
‐
March
2010
Fig.45 - Hamming window
Quick Tips
If desired, use the zoom feature to magnify the FFT waveform.
Use the default dBV RMS scale to see a detailed view of multiple frequencies,
even if their amplitudes vary greatly. Use the linear RMS scale to see an overall
view of how frequencies compare.
Signals that have a DC component or an offset can cause incorrect FFT
waveform component magnitude values. To minimize the DC component, choose
AC Coupling on the source signal.
To reduce random noise and aliased components in repetitive or single-shot
events, set the oscilloscope acquisition mode to ‘average’.
NOTE 1:
Nyquist frequency:
The highest frequency that a Real Time Digital Oscilloscope
can measure at exactly half the sampling rate is called the Nyquist frequency. If
under-sampling occurs when the frequency sampled is higher than the Nyquist
frequency, “False Wave” phenomenon will occur. The relationship between the
frequency being sampled and measured is of great importance in this context.
NOTE 2:
In FFT mode, the following settings are prohibited:
1) Window
set
2) Changing the source channel (in CH1 Setup or CH2 Setup menu)
Summary of Contents for HOS-MS420
Page 11: ...10 V5 1 March 2010 FRONT PANEL AND KEYPAD OVERVIEW Figure 3 ...
Page 32: ...31 V5 1 March 2010 Figure 20 AC Coupling ...
Page 72: ...71 V5 1 March 2010 Fig 42 Rectangle window Fig 43 Blackman window Fig 44 Hanning window ...
Page 79: ...78 V5 1 March 2010 ...
Page 85: ...84 V5 1 March 2010 Figure 4 Continuity Test ...
Page 89: ...88 V5 1 March 2010 ...
Page 91: ...90 V5 1 March 2010 Figure 10 400mA AC Current Measurement ...
Page 95: ...94 V5 1 March 2010 ...