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DPO6000, MPO6000 Series Digital Fluorescent Oscilloscope Product Manual V1.3
78
Application of Bode plots
When studying the frequency response of the amplifier circuit, because the frequency
range of the signal is very wide (from a few hertz to several hundred megahertz or
more), the amplification factor of the amplifier circuit is also very large (up to one million
times). It is a compressed coordinate to expand the field of view when drawing the fre-
quency characteristic curve, the frequency coordinates are exponentially scaled, and
the amplitude (in dB) or phase angle is logarithmic. The amplitude-frequency and
phase-frequency curves drawn in such semi-logarithmic coordinates are called log-
frequency characteristics or Bode plots.
The Bode plots contain both new (blue) data and old (green) data. The "sampling
noise" in traditional systems can be seen in the plot.
When analyzing the stability of negative feedback amplifier circuits in the course of
analog electronic technology, colleges and universities generally use the Bode plot
analysis method.
Enable Bode plots
Press the front-panel Utility-> Bode Plots -> Function [On, Off].
Bode plots data source settings
Press the front-panel Utility-> Bode Plots-> Settings-> Input Source. The input source
can be set from CH1 to CH4.
Press Utility-> Bode Plots -> Settings-> Output Source on the front panel. The output
source can be set to CH1～CH4.
Note:
Input sources and output sources are mutually exclusive.
The minimum frequency is 100HZ.
The maximum frequency is 25MHZ.
The amplitude is 10mV～7V.
Bode plots chart settings
Press Utility-> Bode Plots-> Graph on the front panel.
Gain gear-> Set the grid step value of the gain.
Gain Offset-> Set the grid center value of the gain.
Phase scale-> Set the grid step value of the phase.
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