Theory of Operation Chapter 3
SCXI-1120 User Manual 3-2 © National Instruments Corporation
The major components of the SCXI-1120 are as follows:
• SCXIbus connector
• Digital interface
• Digital control circuitry
• Timing and analog circuitry
The SCXI-1120 consists of eight isolated amplifier channels with gains of 1, 2, 5, 10, 20, 50,
100, 200, 500, 1,000, and 2,000. The SCXI-1120 also has a digital section for automatic control
of channel scanning, temperature selection, and MUXCOUNTER clock selection.
The theory of operation of each of these components is explained in the rest of this chapter.
SCXIbus Connector
Figure 3-2 shows the pinout of the SCXIbus connector.