Advantages and disadvantages of two points and four points in multifunctional bridge experiment

The advantages and disadvantages of two-point and four-point multifunctional bridge experiments are as follows:

1, two-point resistance measurement is to connect the measured resistance to the measuring instrument with two test wires. Its advantages are many measuring points and low cost. However, when measuring resistance at two points, the resistance of the test line will also be included in the measurement result, so the measurement accuracy is relatively low.

2. Four-point measuring resistor uses a pair of test wires to connect the current source, and the other pair of test wires introduces the voltage on the measured resistor into the measuring instrument. Four-point measurement can eliminate the influence of test line resistance on measurement results and improve measurement accuracy. The advantage is accurate measurement. Four-point measurement requires more test lines and contact points, and the cost is relatively high.