National Instruments SCXI -1122 - Manual (Page 37)

Theory of Operation Chapter 4
SCXI-1122 User Manual 4-2 © National Instruments Corporation
IEX+ IEX-
VEX+ VEX/2
VEX-
Current Source
V
oltage
Source
Configuration Register
LPF-Sel
Amplifier Input
Selector Control
Gain
Status Register
Digital Control
&
Interface
Rear Signal Connector SCXIbus Connector
+1
AB0 Switch
AB0+
AB0-
MCH0+ MCH0-
AB0 Control
Attenuator
Calibration EEPROM
TEMP+ TEMP- RSVD
CH0 CH7 CH8
CH15
+ - + - + - + -
IEX+
IEX-
VEX+
R
LPF and
Protection
T
emp+
Auto Zero
Protection
T
emp
+
MIEX
Mux
Counter
8 Input Relays
8 InputT/Output
Relays
Counter Control
Amplifier Input Selection Control
LPF
Gain
Gain
LPF
LPF-Sel
Gain
Gain
LPF and
Output
Mux
LPF-Sel & Output Control
100:1
Attenuator
Amplifier Input
Selector
shunt
SENSE+ SENSE-
AB0
Control
LPF-Sel and
Output Control
Figure 4-1. SCXI-1122 Block Diagram