National Instruments Module SCXI-1503 Manual de usuario descargar pdf (Pagina 20)

Chapter 2 Connecting Signals

In this configuration, the lead-resistance voltage drop across R

converted into a common-mode voltage that is rejected by the differential

amplifier. Also, the polarity of the lead-resistance voltage drops across R

and R

are series opposing, relative to the inputs of the differential

amplifier, eliminating their effect on the voltage measured across R

Note R

and R

are assumed to be equal.

The effectiveness of this method depends on the matching of the current

sources. Each current source on the SCXI-1503 has an accuracy of ±0.05%.

This accuracy results in a worst-case matching of ±0.1%. Refer to the

Chapter 4, Theory of Operation, for accuracy considerations of RTDs and

thermistors.

Front Connector

The pin assignments for the SCXI-1503 front signal connector are shown

in Table 2-1.

Note Do not make any connections to RSVD pins.

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 78 79

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National Instruments Module SCXI-1503 Manual de usuario Pagina 20