With a 4 wire meet method eliminating the lead resistance effects circuit diagram

Published:2011/7/1 2:12:00 Author:Rebekka | Keyword: 4 wire meet method , lead resistance effects | From:SeekIC

The distance measurement temperature resistance is closed to the ADT70, and its lead resistance generally can be neglected. But the leads of the platinic resistance can be up to a dozen meters and even hundreds of meters, the effects are not allow to ignore. Useing the 4 wire meet method can eliminate the influence of lead resistance. The specific circuit is shown in the figure. The characteristics of the circuit is to make the IOUTA and-INIA, IOUTB and + INIA separate from the original. It devides the line 2 into 4 connection. There are 4 nodes. Because A and C node node of the amplifier input lead has not the current, so R1, R2 lead resistance will not cause the measurement error.



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