What are the differences between the six bit digital multimeter, the two-wire method and the four wire method?
The two-wire resistance measurement and the four wire resistance measurement are based on the connection of the resistance and the measuring lead.
Four systemmethods: at the two ends of the resistance connecting two wires is called four wire: the two leads to resistance to provide a constant current of I, the resistance R is converted into a voltage signal U; the other two leads to voltage signal to the U instrument. This method of lead can completely eliminate the influence of the resistance of the wire. This method is mainly used for high-precision resistance measurement.
The two-wire mode: the two-wire system is at the two ends of the resistor with a lead wire, this way is simple, but the cost is low;The wire itself also has a resistance, and the resistance varies with the ambient temperature, which results in additional errors in the resistance measurement.
