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SDS5000X Series Digital Oscilloscope User Manual
165 / 236 W W W. S I G L E N T. C O M
Normal: Displays the FFT result of each frame directly.
Max-Hold: Holds the maximum value in the historic frame on the display.
This mode is suitable for detecting discontinuous waves, such as sporadic
pulse signals, or frequency hopping signals. Press the Clear Sweeps button
on the front panel to clear the max-hold waveform.
Average: Reduces the effect of the superimposed random noise on the
signal. After the FFT mode is set as Average, Average will appear under
FFT Mode. The average count can be set here, ranging from 4 to 1024.
Press the Clear Sweeps on the front panel or touch Reset in the dialog box
to restart the average counter.
Unit
The unit of the vertical axis can be set to dBm, dBVrms or Vrms. dBVrms and
Vrms respectively use logarithmic scale and linear scale. dBVrms is
recommended to show larger dynamic range. 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 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.
Touch Scale to set the vertical scale of FFT waveform by the universal knob or
the virtual keypad. It can also be set by the scale knob shared by Decode,
Digital, Math and Ref on the front panel. The reference point for vertical scale
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