Answer Posted / guest

Resistanc Temperature Detector(RTD)encorporates two basic
concepts

1)Variation of temperature varies the resistance of Pt wire.
2)Variation in resistance affects the balancing of DC
bridge circuit.

For measurement purposes lead wires are brought out to make
external connections.These lead wires have some resistances
which affects the bridge balancing.

Since we can not reduces the resistances of lead wire to
zero.So, either 3 wire or 4 wire connection is employed to
ELIMINATES THE IMBALANCING TO THE BRIDGE CIRCUIT caused by
resistances of lead wires so that an accurate measurement
can be made.These wires(3 or 4) are called compensating
leads.

Author:arbelectbit@yahoo.com

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