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university:tools:m2k:scopy:networkanalyzer [21 May 2018 16:02]
Alexandra Fix typo
university:tools:m2k:scopy:networkanalyzer [11 Apr 2019 17:47]
rgetz [Network Analyzer - Low Pass Filter Example]
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 To zoom in or out, you can use the + and - buttons (See above image). When zoomed in, you can hold left click and drag the plot around. To zoom in or out, you can use the + and - buttons (See above image). When zoomed in, you can hold left click and drag the plot around.
 +
 ==== Nichols Plot ==== ==== Nichols Plot ====
  
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 You can determine the gain and phase margins graphically and easily using this plot. The gain margin can be graphically determined by getting the absolute value of the magnitude axis intersect. The phase margin is determined by the distance between the origin and the phase axis intersect. You can determine the gain and phase margins graphically and easily using this plot. The gain margin can be graphically determined by getting the absolute value of the magnitude axis intersect. The phase margin is determined by the distance between the origin and the phase axis intersect.
 The settings you applied to the controls when plotting either in bode or Nyquist will also reflect in the Nichols plot. The settings you applied to the controls when plotting either in bode or Nyquist will also reflect in the Nichols plot.
 +
 +===== Network Analyzer - Low Pass Filter Example =====
 +
 +The following example we will show how to use the Network Analyzer to obtain the frequency response of a low pass filter circuit. When ever using the network analyzer, you need a stimulus/​reference channel (always waveform output channel 1 and oscilloscope channel 1) and a measurement channel (always oscilloscope channel 2).
 +
 +Consider the circuit in the figure below:
 +
 +<WRAP centeralign>​{{:​university:​tools:​m2k:​scopy:​na_lpf.png|}}</​WRAP>​
 +
 +To characterize the filter we need an input/​stimulus,​ and way to measure the response, ​
 +  - the reference channel:
 +    * the stimulus : Waveform Generator channel 1 ('​W1'​) ​
 +    * the reference channel measurement:​ Oscilloscope Positive Channel 1 ('​+1'​)
 +  - the response channel:
 +    * the output of the filter : Oscilloscope Positive Channel 2 ('​+2'​)
 +
 +Since everything in this example is ground referenced, the oscilloscope negative input channels are connected to ground.
 +
 +Breadboard connections for such a circuit are displayed below:
 +
 +<WRAP centeralign>​{{:​university:​tools:​m2k:​scopy:​na_lpf_bb.png?​400|}}</​WRAP>​
 +
 +In the Network Analyzer interface, set the Reference: Channel 1 and the frequency range: Min Freq 1kHz and Max Freq 10MHz. ​
 +
 +Run the instrument. The resulted plot is the frequency response of the low pass filter for the component values chosen.
 +
 +{{:​university:​tools:​m2k:​scopy:​na_lpf_plot.png|}}
 +
 +The signal'​s amplitude is attenuated for frequencies larger then the cutoff frequency.
  
 **Return to [[university:​tools:​m2k:​scopy|Scopy Main Page]]** **Return to [[university:​tools:​m2k:​scopy|Scopy Main Page]]**
university/tools/m2k/scopy/networkanalyzer.txt · Last modified: 11 Apr 2019 17:47 by rgetz