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GW Instek GDS-800 Series User Manual User Manual

Page 20

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GDS-800 Series Digital Storage Oscilloscope Operation Manual

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Position: Adjusts the FFT position on the display area by rotating the

VARIABLE knob. The “ ” math position indicator which located on the left side

of LCD screen is always pointed to 0 dB approximately, where 0dB is defined as

1Vrms.

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Unit/div 20/10/5/2/1 dB: Press F5 softkey to expand the FFT spectrum vertically.

Expand factors are 20dB/Div, 10dB/Div, 5dB/Div, 2dB/Div and 1dB/Div.

FFT spectrum measurement by using cursors: FFT spectrum’s magnitude (dB)

and frequency (Hz) can be measured by using cursors. Press CURSOR pushbutton

and select Source MATH by pressing F1 softkey.

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Source MATH: Selects FFT spectrum cursors measuring function.

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Horizontal

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: Adjust vertical cursors by

rotating the VARIABLE knob. The reference values are also shown on the LCD

screen:

f1: first cursor frequency indication
f2: second cursor frequency indication

: The difference value of f1 and f2

Div: frequency per division at present

For more detail operations, please refer to page 59.

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Vertical

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: Adjust horizontal cursors by

rotating the VARIABLE knob. The reference values are also shown on the LCD

screen: The color of two horizontal cursors will be changed to red for the color

oscilloscope.

M1: magnitude indication of first cursor
M2: magnitude indication of second cursor

: The difference value of M1 and M2

For more detail operations, please refer to page 60.