National Instruments SCXI -1125 用户手册
© National Instruments Corporation
4-1
4
Theory of Operation
The section includes a brief overview and a detailed discussion of the
circuit features of the module. The two major modes of operation,
multiplexed and parallel mode, are discussed. Refer to Figure 4-1 while
reading this section.
circuit features of the module. The two major modes of operation,
multiplexed and parallel mode, are discussed. Refer to Figure 4-1 while
reading this section.
Figure 4-1. SCXI-1125 Block Diagram
Gain
The SCXI-1125 has 12 different gain settings, from 1 to 2000, enabling
signal ranges ±5 V to ±2.5 mV. When the SCXI-1125 is used with a
terminal block that provides attenuation, the input range expands up to
1000 V. Refer to Appendix A,
signal ranges ±5 V to ±2.5 mV. When the SCXI-1125 is used with a
terminal block that provides attenuation, the input range expands up to
1000 V. Refer to Appendix A,
for a full list of input ranges.
Gain Select
Rear Signal Connector
AI 0+
AI 0–
AI 7+
AI 0
AI 7
AI 7–
AI 0
AI 7
+
Gain Select
+
+
–
+
–
MTEMP
Lowpass
Filter
Lowpass
Filter
Lowpass
Filter
Lowpass
Filter
F
ront Signal Connector
Analog
Multiplexer
Multiplexer
Control
Buffer
Analog
Bus
Switch
To
Analog
Bus
Scan
Clock
Digital Interface
and Control
SCXIb
us Connector