What is the difference between the various bridge measurements?

The advantage of the BrHalf4W circuit is that the effect of lead resistance is measured and compensated for. The disadvantage is that it requires two differential (four single-ended) voltage input channels and four wires to the sensor.

Some sensors have four wires and are sensitive enough that the lead resistance would cause too great an error.

The BrHalf, a two-wire measurement, does not compensate for lead resistance.

The BrHalf3W lead compensation assumes that both leads are of the same resistance.

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