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Chapter 3 Configuring Your SCXI Hardware and Software

RSE Input (Eight Channels, Factory Setting)

RSE input means that all input signals are referenced to a common ground

point that is also tied to the SCXI-1200 analog input ground. The

instrumentation amplifier negative input is tied to analog ground. The RSE

configuration is useful for measuring floating signal sources. With this

input configuration, the SCXI-1200 can monitor eight different analog

input channels.

Considerations for using the RSE configuration are discussed in the

SCXI-1200 User Manual. Notice that in this mode the return path of the

signal is analog ground at the connector through the AISENSE/AIGND

pin.

NRSE Input (Eight Channels)

NRSE input means that all input signals are referenced to the same

common-mode voltage, which floats with respect to the SCXI-1200 analog

ground. This common-mode voltage is subsequently subtracted by the

input instrumentation amplifier. The NRSE configuration is useful for

measuring ground-referenced signal sources.

Considerations for using the NRSE configuration are discussed in the

SCXI-1200 User Manual. Notice that in this mode, the return path of the

signal is through the negative terminal of the amplifier at the connector

through the AISENSE/AIGND pin.

Note

To measure the conditioned signals provided by analog input modules in the same

chassis, the SCXI-1200 must be configured for NRSE input mode.

DIFF Input (Four Channels)

DIFF input means that each input signal has its own reference, and the

difference between each signal and its reference is measured. The signal

and its reference are each assigned an input channel. With this input

configuration, the SCXI-1200 can monitor four differential analog input

signals.

Considerations for using the DIFF configuration are discussed in the

SCXI-1200 User Manual. Notice that the signal return path is through

the negative terminal of the amplifier and through channel 1, 3, 5, or 7,

depending on which channel pair you select.

National Instruments SCXI Series Getting Started

Other manuals for National Instruments SCXI Series