Instruction Manual

12
Publication 1790-IN010B-EN-P - April 2003
To ensure that the lead values match as closely as
possible:
• Keep lead resistance as small as possible and less than
25 ohms.
• Use quality cable that has a small tolerance impedance
rating.
• Use a heavy-gauge lead wire which has less resistance
per foot.
RTD Wiring Configurations
Three configurations of RTDs can be connected to the
blocks:
• 2-wire RTD, which is composed of an RTD EXC
(excitation) lead wire and a RTN (return) wire.
• 3-wire RTD, which is composed of a Sense and 2 RTD
lead wires (RTD EXC and RTN).
• 4-wire RTD, which is composed of a Sense and 2 RTD
lead wires (RTD EXC and RTN). The second sense
wire of a 4-wire RTD is left open.
2-Wire RTD Configuration
CH0_A
CH0_B
COM
Add Jumper
Cable Shield (to Ground)
RTD EXC RTD EXC
Return Return