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© National Instruments Corp. 11 NI 9237 Operating Instructions and Specifications
Wiring TEDS Channels
Ensure that neither the TEDS data (T+) nor the TEDS return (T–)
signal is tied in common to any AI signals on the NI 9237. The
NI 9237 connects all the T– signals together internally. Visit
ni.com/info and enter the info code rdteds for more
information about TEDS sensors.
NI 9237 Connection Options
Wiring resistance can create errors in bridge circuits. The NI 9237
provides two mechanisms to correct for these errors: remote
sensing and shunt calibration.
Remote Sensing
Remote sensing continuously and automatically corrects for errors
in excitation leads, and generally is most appropriate for half- and
full-bridge sensors.
Long wire and small gauge wire have greater resistance, which can
result in gain error. The resistance in the wires that connect the
excitation voltage to the bridge causes a voltage drop, which is a
source of gain error. The NI 9237 includes remote sensing to
compensate for this gain error. Connect remote sense wires to the
points where the excitation voltage wires connect to the bridge