We now begin our discussion of balanced current coaxial techniques as applied to impedance measurement with AC bridges. As mentioned in the introduction, this provides a good example of how these techniques can be applied in general to sensitive electrical measurements of other parameters -voltage, current, power and so forth. Before moving on, it is as well to note the advantage of a substitution measurement in comparing two nearly equal impedances, and indeed in metrology in general. We can make a formal statement of the philosophy of a substitution measurement as follows.
General principles of accurate impedance measurement, Page 1 of 2
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