Ground-referencing the signals, Connecting resistive devices to the scxi-1503, Ground-referencing the signals -2 – National Instruments Module SCXI-1503 User Manual
Page 15: Connecting resistive devices to the scxi-1503 -2
Chapter 2
Connecting Signals
2-2
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Note
Exceeding the differential or common-mode input channel ranges results in a
distorted signal measurement, and can also increase the settling time requirement of the
connected E/M Series DAQ device.
Ground-Referencing the Signals
Do not ground signals that are already ground-referenced; doing so results
in a ground loop, which can adversely affect the measurement accuracy.
Directly grounding floating signals to the chassis ground without using a
bias resistor is not recommended as this can result in noisy readings
Connecting Resistive Devices to the SCXI-1503
You can connect resistive devices to the SCXI signal conditioning system
in a 4-, 2-, or 3-wire configuration. Figures 2-1 through 2-4 illustrate
various ways to connect sensors for current excitation and voltage
measurements using the SCXI-1503 with the SCXI-1306 terminal block.
Refer to the appropriate ADE and SCXI documentation for information
concerning setting appropriate voltage gains for the analog inputs.
You can use the SCXI-1306 terminal block to make signal connections to
the SCXI-1503. When using the SCXI-1306 terminal block, refer to the
SCXI-1306 Terminal Block Installation Guide.