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• Press More > Color Grade to enable or disable the color grade display of the
operation results. When enabled, different colors are displayed on the screen to
indicate the times of data acquisition or acquisition probability.
• Press More > Reset ColorGrade to clear the color grade display and display the
color grade again.
9.1.5 FFT
FFT (Fast Fourier Transform) is used to transform time-domain signals to frequency-
domain components (frequency spectrum). This series of oscilloscope provide FFT
operation function which enables you to observe the time-domain waveform and
spectrum of the signal at the same time. FFT operation can facilitate the following
works:
• Measure harmonic components and distortion in the system;
• Display the characteristics of the noise in DC power;
• Analyze vibration.
Press > Math1 > Operator to "FFT":
• Press Operation continuously to enable or disable the FFT operation function.
When enabled, the operation results are displayed as purple waveforms on the
screen. At the same time, the parameters such as vertical scale, center frequency,
and resolution are displayed at the bottom of the screen, as shown in the
following figure. Of which, FFT resolution is the quotient of the sample rate and
the number of FFT points. If the number of FFT points is a fixed value (65535 at
most), then the lower the sample rate, the higher the resolution.
Vertical Scale
Span
ResolutionCenter FrequencySample Rate
• Press
Source, rotate the multifunction knob , and then press the knob to
select the channel. You can also press Source continuously or enable the touch
screen to select the channel. The available channels are CH1, CH2, CH3, CH4.
Operations and Measurements
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