# Locus Diagram

Discussion in 'General Electronics Chat' started by Faidi, Feb 20, 2007.

1. ### Faidi Thread Starter New Member

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what is meant by locus diagram and what is it used for
Plz help me

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Personally, I've never heard of a locus drawing and neither did Wikipedia, however, according to them, Locus is the name of several journals for artists. Also, one definition of locus [or loci] is the set of points satisfying a condition such as a curve; as such it/they would be used in mechanical drafting or drawings. Hope this helps; if not, give Google a try.

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4. ### Distort10n Active Member

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It's all about the poles and zeroes...used in control system stability calculations.

5. ### Dave Retired Moderator

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I too thought root locus diagrams when I first read this question. Its an old, in some practical cases obsolete method, however for learning the rudiments of control system theory it is a good way of cementing the basics.

Dave

6. ### sword of truth New Member

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locus diagram is presentation of impedance (L(&or)c(&or)R) where the 'R' is on the x axis and the(L,c) are on the y axis and can be used in the presention admittance and using ohms lw we can get the current in a circuit or voltage on that circuit

7. ### Papabravo AAC Fanatic!

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Smith charts also serve this function.

8. ### sword of truth New Member

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i don't know much about smith charts but i think by locus diagram we can determine the behaviour of the circuit

9. ### Dave Retired Moderator

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Do you care to embellish? This is certainly a different interpretation from those outlined previously, when we talked about the root locus diagram which is essentially a graphical method for ascertaining the location of the closed loop poles of a system without the necessity to compute them explicitly.

Dave

10. ### amit _bhadauriya New Member

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If one of the circuit element is variable , then the characteristics of the circuit varies .The locus of the extremity of current phasor ,obtained for various values of a variable element is called a locus diagram .