Nrse Input Mode (Eight Channels); Diff Input Mode (Four Channels) - National Instruments PCI-1200 User Manual

Chapter 2 Installing and Configuring the NI PCI-1200

NRSE Input Mode (Eight Channels)

NRSE input means that all input signals are referenced to the same
common-mode voltage, which floats with respect to the NI PCI-1200
analog ground. This common-mode voltage is subsequently subtracted by
the input instrumentation amplifier. NRSE mode is useful for measuring
ground-referenced signal sources.
Considerations for using NRSE mode are discussed in Chapter 3, Signal
Connections. Notice that in this mode, the signal return path is through the
negative terminal of the amplifier at the connector through the
AISENSE/AIGND pin.

DIFF Input Mode (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 NI PCI-1200 can monitor four differential AI signals.
Considerations for using DIFF mode are discussed in Chapter 3, Signal
Connections. 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 Corporation 2-5 NI PCI-1200 User Manual