Measurement-computing CIO-EXP-GP Manual do Utilizador descarregar pdf (Página 29)

EXCITATION CURRENT (+)

SENSE HIGH (+)

SENSE LOW (-)

EXCITATION CURRENT (-)

4 WIRE

RTD

These connections eliminate the fixed inaccuracy

associated with the 2-wire RTD. Since virtually no

current flows on the sense lines, there is no voltage

drop in the sense lines. Thus, the error associated with

2-wire RTDs is eliminated. We recommend the 4-wire

RTD, but you must judge if the added cost is worth the

additional accuracy.

Figure 6-5. Four-Wire RTD Hookup

6.9 Verifying the Installation

To verify the installation, use the InstaCal program installed on your computer. This software came with

your A/D board if you bought the board from the same manufacturer as the CIO-EXP-GP. If your A/D

board is not from the same manufacturer but is compatible, please call technical support and request a

copy of InstaCal.

Use InstaCal's TEST option to verify that a signal present at one of the CIO-EXP-GP inputs can be read.

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Measurement-computing CIO-EXP-GP Manual do Utilizador Página 29