All About Circuits Forum Locus Diagram
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#1
02-20-2007, 06:57 PM
 Faidi New Member Join Date: Jan 2007 Location: Cairo Posts: 1
Locus Diagram

what is meant by locus diagram and what is it used for
Plz help me
#2
02-21-2007, 03:42 AM
 wireaddict Senior Member Join Date: Nov 2006 Location: E. Central MI [Temp.] Posts: 133

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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#3
02-21-2007, 03:46 AM
 Ron H E-book Developer Join Date: Apr 2005 Location: Idaho, USA (GMT-7) Posts: 7,050

#4
02-21-2007, 03:57 AM
 Distort10n Senior Member Join Date: Dec 2006 Posts: 429

It's all about the poles and zeroes...used in control system stability calculations.
#5
02-21-2007, 02:11 PM
 Dave Senior Member Join Date: Nov 2003 Posts: 6,961 Blog Entries: 17

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
03-02-2007, 03:47 PM
 sword of truth New Member Join Date: Jan 2007 Posts: 5

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
03-02-2007, 04:04 PM
 Papabravo Senior Member Join Date: Feb 2006 Location: Michigan, USA (GMT-5) Posts: 5,839

Smith charts also serve this function.
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#8
03-02-2007, 04:16 PM
 sword of truth New Member Join Date: Jan 2007 Posts: 5

i don't know much about smith charts but i think by locus diagram we can determine the behaviour of the circuit
#9
03-03-2007, 12:17 AM
 Dave Senior Member Join Date: Nov 2003 Posts: 6,961 Blog Entries: 17

Quote:
 Originally Posted by sword of truth 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
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
09-20-2010, 04:24 AM
 amit _bhadauriya New Member Join Date: Sep 2010 Location: jaipur Posts: 1

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 .

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