Mathematical operations
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Copyright © Qingdao Hantek Electronics Co., LTD Tablet1000 User manual
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periodic waveform.
Rectangle: A dedicated window for a discontinuous waveform, similar to the case without
a window. Used for measuring transient and short pulse waveforms.
Center
The FFT (amplitude) frequency waveform at the central grid line.
Span
The frequency span of the FFT (amplitude) waveform displayed on the screen.
Reference level
The reference level position of the FFT (amplitude) waveform.
FFT operation:
1. Tap the MATH channel icon to access the MATH menu.
2. Select FFT and perform FFT operation.
3. Select data source and click the arrow to select CH1~CH4.
4. Select the vertical unit and click the arrow to select dB or VRms.
5. Select the FFT function and click the arrow to select different window functions.
6. Set the frequency of frequency domain waveform corresponding to the horizontal
center of the screen, click the arrow for fine adjustment, or click the data and input
the value on the digital keyboard popping up.
7. To set the frequency span, click the arrow and select 62.50KHz or 31.25KHz.
8. To set the reference level, click the arrow for fine adjustment, or click the data, input
the value on the popping up numeric keypad.
Figure 7.3 FFT operation
A signal with a DC component or deviation will result in an error or deviation of the FFT
waveform component. To reduce the DC component, set the "Channel coupling" of the
data source to "AC" mode.
In order to reduce the random noise and aliasing frequency component of repeated or
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