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Why open loop transfer function ?

  1. Sep 14, 2011 #1
    I don't understand why always we use open loop transfer function G(s)H(s) to draw the root locus.
    can somebody please clarify my doubt.

    Thanks in advance.
  2. jcsd
  3. Sep 14, 2011 #2
    because G(s)H(s) is easily available in factor form as it is obtained by simply modelling the transfer functions of individual components and multiplying them . this helps in obtaining the poles and zeroes easily as opposed to closed loop transfer function whose roots are hard to find.
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