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National Instruments
SCXI-1121
Manuel D’Utilisation
National Instruments SCXI-1121 Manuel D’Utilisation
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Contents
SCXI-1121 User Manual
viii
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Figures
Figure 2-1.
SCXI-1121 General Parts Locator Diagram ......................................... 2-2
Figure 2-2.
SCXI-1121 Detailed Parts Locator Diagram ........................................ 2-3
Figure 2-3.
SCXI-1121 Front Connector Pin Assignment ...................................... 2-18
Figure 2-4.
Ground-Referenced Signal Connection with
High Common-Mode Voltage .............................................................. 2-21
Figure 2-5.
Floating Signal Connection Referenced to Chassis Ground for
Better Signal-to-Noise Ratio................................................................. 2-21
Figure 2-6.
Floating AC-Coupled Signal Connection ............................................. 2-22
Figure 2-7.
AC-Coupled Signal Connection with High Common-Mode Voltage .. 2-22
Figure 2-8.
Assembling and Mounting the SCXI-1330
Connector-and-Shell Assembly ............................................................ 2-25
Figure 2-9.
Nulling Circuit ...................................................................................... 2-29
Figure 2-10.
Shunt Circuit ......................................................................................... 2-30
Figure 2-11.
SCXI-1320 Parts Locator Diagram....................................................... 2-36
Figure 2-12.
SCXI-1328 Parts Locator Diagram....................................................... 2-37
Figure 2-13.
SCXI-1321 Parts Locator Diagram....................................................... 2-38
Figure 2-14.
SCXI-1121 Rear Signal Connector Pin Assignment ............................ 2-39
Figure 2-15.
SCANCLK Timing Requirements ........................................................ 2-43
Figure 2-16.
Slot-Select Timing Diagram ................................................................. 2-44
Figure 2-17.
Serial Data Timing Diagram ................................................................. 2-45
Figure 2-18.
Configuration Register Write Timing Diagram .................................... 2-46
Figure 2-19.
SCXI-1121 Module ID Register Timing Diagram ............................... 2-47
Figure 3-1.
SCXI-1121 Block Diagram................................................................... 3-1
Figure 3-2.
SCXIbus Connector Pin Assignment.................................................... 3-3
Figure 3-3.
Digital Interface Circuitry Block Diagram ........................................... 3-6
Figure 3-4.
SCXI-1121 Digital Control................................................................... 3-7
Figure 3-5.
Analog Input Block Diagram................................................................ 3-9
Figure 3-6.
Analog Output Circuitry ....................................................................... 3-15
Figure 3-7.
Single-Module Parallel Scanning ......................................................... 3-17
Figure 3-8.
Single-Module Multiplexed Scanning (Direct) .................................... 3-18
Figure 3-9.
Single-Module Multiplexed Scanning (Indirect) .................................. 3-19
Figure 3-10.
Multiple-Module Multiplexed Scanning............................................... 3-19
Figure 3-11.
Multiple-Chassis Scanning ................................................................... 3-20
Figure B-1.
SCXI-1121 Rear Signal Connector Pin Assignment ............................ B-1
Figure C-1.
SCXIbus Connector Pin Assignment.................................................... C-2
Figure D-1.
SCXI-1121 Front Connector Pin Assignment ...................................... D-2
Figure E-1.
SCXI-1340 Installation ......................................................................... E-4
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