Sensoray 7429 Manual do Utilizador descarregar pdf (Página 33)

no current passes through the sense lines, therefore no voltage develops across the sense

wires.

Three-wire connection

Using three wires has the advantage of eliminating current through one of the two sense

leads. This yields a 50% reduction in lead-loss errors compared to the two-wire circuit.

Using four wires eliminates all error due to lead-loss.

We recommend use of the four-wire circuit using four-conductor shielded cable. You

should always use shielded cable for RTD's regardless of which circuit you choose for

your application. Make sure you connect the cable shield only to the channel SHIELD

pin.

Four-wire connection

THERMOCOUPLES AND DC VOLTAGE

Thermocouple and DC voltage inputs are connected directly to the channel SENSE+

and SENSE- pins. The positive wire is connected to SENSE+, while the negative wire

is connected to SENSE-.

Sense+

Sense-

Power+

Power-

Shield

Sense+

Sense-

Power+

Power-

Shield

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