Post by thread:Bridge Measurement Circuits

I'm attempting to measure LCR (particularly L & C) in electrically complex combinations. eg inductors with open magnetic paths, various cable stubs etc. Commercial meters / bridges exist to do the hard work for you. I'd like to avoid making Messrs HP or Wayne-Kerr richer if possible. Has anyone got links for the various traditional bridge circuits for measuring these. I dimly recall a very capable version (Marconi?) which allowed determination of all parameters for either L or C. Diagonally opposing legs were AFAIR R in series with L in one leg and R in parallel with C in the other plus pure R's in the other 2 legs. Basic calculations fail to produce useful balance conditions for this combination so I have probably missed a key point. Anyone got any useful information. (Perhaps an auto balance version utilising a PIC could be built :-)) Russell McMahon _____________________________ What can one unbalanced person do? Help the hungry at no cost to yourself! at http://www.thehungersite.com/