National Instruments 1142 用户手册
Chapter 4
Theory of Operation
4-2
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Figure 4-1. SCXI-1141/1142/1143 Module Block Diagram
External Clock
Analog Bus
Rear Signal Connector
Analog
Switch
Analog
Switch
Digital
Interface
and Control
Filter
Input
Protection
F
ront Signal Connector
SCXIbus Connector
Calibr
ation
Selection
+
–
Instrumentation
Amplifier
Instrumentation
Amplifier
Filter
Bypass
Input
Protection
Calibr
ation
Selection
Calibration
EEPROM
+
–
Output Clock
AI 0
AI 7
AI 0+
AI 0–
AI 7+
AI 7–
Digital Control Bus
Internal
16-Pin Analog
Input Connector
8 to 1 Multiple
x
e
r
Filter
Filter
Bypass
AI 0
AI 7