Keithley 2651 RTDs1 free download

File name 2651 RTDs1.pdf

A G R E AT E R M E A S U R E O F C O N F I D E N C E where T is temperature, P is the I2R power generated, and S is degrees C/milliwatt. Temperature Measurement Methods There are several techniques for meas- uring temperature with an RTD. The first is a two-wire method. This method works by forcing current through the RTD and measuring the resulting voltage. The benefit is that it's a simple method using only two wires, making it easy to connect and imple- ment. The main drawback is that the lead resistance is part of the measurement, which can cause some error. An improvement on the two-wire method is the three-wire method. Here again, a cur- rent is forced through the device and a re- sulting voltage is measured. However, using Basics of Temperature a third wire provides compensation for the lead resistance. This requires either a three- wire compensating measurement unit or ac- Measurement: RTDs