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- Memory Points: Set the number of points to be saved in the scope memory, when Save function is activated. The number of points varies between 100 to 2000 points. - A/D Rate: Set the acquisition data rate. The range is from 500Hz to 4,000KHz and is determined automatically according to your computer speed. FFT Function The FFT mode can be reached by pressing the Hold button and followed by selecting either X or Y buttons. A graphical display of Position (X or Y) or of power at each frequency is shown. This data is obtained by performing a Fast Fourier Transform (FFT) on the data in the SCOPE mode. The vertical scale is automatically selected and is not adjustable. The horizontal (frequency) scale can be varied and shifted. Within the graphical area, the value of the DC or zero Hertz component is displayed. The box labeled Data FFT denotes the Frequency (horizontal) and Amplitude (vertical) locations of the Cursor. Clicking and dragging with the mouse pointer changes the position of the cursor. OBP Series - USB Version 61