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Calibration Procedures Chapter 5
SC-2043-SG User Manual 5-2 © National Instruments Corporation
External Excitation Source
You can connect an external excitation source of up to 10 VDC to screw terminal block J7 on the
SC-2043-SG. If you are using an external excitation source, you must perform the following
steps.
1. If you are using a rack-mount kit, remove the cover.
Caution: If you are using the SC-2043-SG with a Lab/1200 board, you MUST set jumper
W8 to the ST position. Failure to do so can damage your Lab/1200 board if
your excitation voltage exceeds 10 V. National Instruments is
NOT liable for
any damages resulting from incorrect configuration of jumper W8. Refer to
Table 2-5 and Chapter 2, Configuration and Installation, for more information.
2. Configure the SC-2043-SG for external excitation so that your excitation source is connected
to screw terminal block J7. Refer to Chapter 2, Installation and Configuration, and
Chapter 3, Signal Connections, for more information.
3. Configure all your strain gauge bridges to the desired SC-2043-SG channels so that the
excitation voltage source is calibrated with the exact bridge load it must supply.
Note: Remember to short the input terminals (CHn
±
) of any unused channel to its
negative excitation output terminal (-EXn).
4. Select and read the channel that is configured for local excitation sensing. If you have not
configured the SC-2043-SG for local excitation sensing, refer to Chapter 2, Installation and
Configuration, for more information.
5. Adjust your excitation source output level until the voltage you are monitoring reaches the
exact level desired. Do
NOT exceed 10 VDC.
6. Replace the rack-mount chassis cover, if used.