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Chapter 3
Theory of Operation
SCXI-1121 User Manual
The major components of the SCXI-1121 are as follows:
•
SCXIbus connector
•
Digital interface
•
Digital control circuitry
•
Timing and analog circuitry
The SCXI-1121 consists of four isolated amplifier channels with gains of
1, 2, 5, 10, 20, 50, 100, 200, 500, 1,000, and 2,000, and four isolated
excitation channels with voltage or current excitation. The SCXI-1121 also
has a digital section for automatic control of channel scanning, for
temperature selection, and for MUXCOUNTER clock selection.
The theory of operation for each of these components is explained in the
rest of this chapter.
3-2
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