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© National Instruments Corporation 4-1 SC-2040 User Manual
Chapter 4
Theory of Operation
This chapter contains a functional overview of the SC-2040 board and explains the operation of
each functional unit making up the SC-2040.
Functional Overview
The SC-2040 consists of eight channels, each one comprising an instrumentation amplifier with
DIP switch-programmable gains of 1, 10, 100, 200, 300, 500, 600, 700, or 800, and a track-and-
hold amplifier. The analog inputs are overvoltage protected. The DAQ board or a user-supplied
external trigger switches the SC-2040 between hold mode and track mode as desired. All eight
channels are simultaneously placed in hold mode.
The block diagram in Figure 4-1 illustrates the key functional components of the SC-2040.