NI 9237E Operating Instructions and Specifications
10
ni.com
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 9237E. The
NI 9237E connects all the T– signals together internally. The
NI 9237E with DSUB has only three T– pins. To connect four
TEDS sensors to the NI 9237E with DSUB, wire the TEDS return
signals of two of the sensors to one of the T– pins. Visit
ni.com/info
and enter the info code
rdteds
for more
information about TEDS sensors.
Connection Options to Correct for Resistance Errors
Wiring resistance can create errors in bridge circuits. The
NI 9237E 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