title: Matlab Simulink Random number generator block
body: <p>I am using a random number generator block with a controlled voltage source to generate noise in my circuit. There is a 15V voltage source seperate from controlled voltage source. What would be a 'realistic' value for variance in the random number generator block?</p>
  
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  <p>Initially i have every value set on default setting:</p>
  
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  <p>Mean: 0
  Variance: 0.1
  Seed: 0
  Sample time: 0.1</p>
  
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  <p>So i want the controlled voltage source to output 'realistic' changes in voltage (noise).</p>