National Instruments Module SCXI-1503 - Manual (Page 32)

Chapter 4 Theory of Operation
SCXI-1503 User Manual 4-2 ni.com
Figure 4-1. Block Diagram of SCXI-1503
AI 15 + AI 15 –
Calibr
ation
Source
SCXIb
us
Interf
ace
CJSENSOR
Front Signal Connector
Rear Signal Connector
32-to-1 Mux
Input Protection
and Lo
wpass Filter
Switch
Switch
Switch
Mux
Inst. Amp + –
AI 0 + AI 0 –
AI 0 + AI 0 –
Lo
wpass Filter
Buff
er
Buff
er
Inst. Amp + –
Gain 31
Gain 0
Lo
wpass Filter
Gain Select
Digital Interf
ace
and Control
Buff
er
Buff
er
Mux
Calibr
ation EEPR
OM
Input Select
OUT REF AI GND AB 0 + AB 0
–
SCXIbus Connector
100
µ
A
IEX 15 – IEX 15 +
100
µ
A
IEX 0 – IEX 0 +