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Chapter 4
Theory of Operation
This chapter contains a functional overview of the SC-2043-SG board and explains the operation
of each functional unit making up the SC-2043-SG.
Functional Overview
The SC-2043-SG consists of eight channels, each comprising a bridge completion network, an
instrumentation amplifier with a gain of 10, offset nulling, filtering, and screw terminal
connections to accommodate strain gauge bridge measurements. An onboard excitation voltage
source is provided, along with the option of user-supplied external excitation. Additional
breakout screw terminals are also provided for signal termination of analog, digital, and timing
I/O lines on the DAQ board I/O connector.
The key functional components of the SC-2043-SG are:
•
Bridge completion network
•
Amplification
•
Offset nulling
•
Filtering
•
MIO and Lab/1200 I/O connectors and breakout screw terminals
•
Excitation voltage source
•
Power supply
The remainder of this chapter describes the theory of operation for each of these components.
© National Instruments Corporation
4-1
SC-2043-SG User Manual
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