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SDS3000X HD Series Digital Oscilloscope User Manual
int.siglent.com 185
Touch Vertical or Horizontal in the math dialog box to
recall the FFT vertical or horizontal settings dialog box:
A. Set the vertical scale and reference level
B. Set the unit (dBVrms, Vrms, and dBm).
C. Return to the previous menu
D. Set the horizontal scale, include center frequency,
frequency span, starting frequency, and end frequency
Unit
The unit of the vertical axis can be set to dBm, dBVrms, or Vrms. dBVrms and Vrms respectively using
either logarithmic or linear scaling. dBVrms is recommended to show larger dynamic ranges. dBm is
a power unit, the correct result can be obtained only if the value of Ext Load is set to be consistent
with the load impedance of the actual measured signal.
Vertical Control
Touch Ref Level to set the reference level of the FFT waveform by the universal knob or the virtual
keypad. It can also be set by the offset knob shared by Decode, Digital, Math, and Ref on the front
panel.
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