National Instruments SCXI-1121 - Manual

National Instruments SCXI-1121

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Table of Contents:

  • Page 2 – Worldwide Offices
  • Page 3 – Important Information; Warranty; Copyright; WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS
  • Page 4 – Contents; About This Manual
  • Page 6 – Glossary
  • Page 7 – Figures
  • Page 8 – Tables
  • Page 9 – Conventions; The following conventions appear in this manual:; bold; italic
  • Page 10 – Related Documentation
  • Page 11 – Introduction; Configuration and Installation
  • Page 12 – What Your Kit Should Contain; Kit Component
  • Page 14 – Optional Equipment; Equipment
  • Page 15 – Refer to the; Custom Cables
  • Page 16 – Unpacking
  • Page 17 – Module Configuration
  • Page 18 – The jumpers are used as follows:
  • Page 19 – Digital Signal Connections; Timing Requirements and
  • Page 21 – Jumper; Parking position
  • Page 22 – Analog Configuration; The SCXI-1121 has 45 analog configuration jumpers.
  • Page 23 – Position AB-R1 connects the analog reference to the SCXIbus guard.
  • Page 24 – Input Channel Jumpers; Gain Jumpers
  • Page 25 – Filter Jumpers; Excitation Jumpers; Current and Voltage Excitation Jumpers; Input Channel
  • Page 26 – Excitation Level; In the Current mode; Excitation
  • Page 28 – Using the Internal Half-Bridge Completion; ± 0.05% ratio tolerance resistors with a temperature coefficient of; Channel
  • Page 30 – Hardware Installation; Technical Support Resources
  • Page 31 – Signal Connections; Cautions
  • Page 32 – 0 Vrms and 42.4 V peak or 60 VDC) are present, you must connect a; Front Connector
  • Page 34 – Front Connector Signal Descriptions; Pin; Do not connect any signal to these pins.
  • Page 36 – Analog Input Channels
  • Page 38 – Excitation Channels; Warning; Temperature Sensor Connection; Warning
  • Page 40 – Optional; ) are present, you must connect the safety earth ground to the
  • Page 41 – SCXI-1321 Nulling Circuitry; Configure your bridge to the selected channel.; Channel Number
  • Page 42 – where
  • Page 43 – as given; Using the SCXI-1321 with RTDs and Thermistors; Remove the nulling resistor from its sockets.
  • Page 44 – SCXI-1121 Shunt Calibration; Nulling circuit of Channel 0 is disabled
  • Page 46 – Terminal Block Temperature Sensor; Configuration Register; where T
  • Page 47 – = resistance of the thermistor in; = output voltage of the temperature sensor; Terminal Block Jumper Configuration; ln
  • Page 48 – DTS mode selected; DTS mode selected
  • Page 49 – Terminal Block Signal Connection; Warnings; with RTDs and Thermistors
  • Page 52 – Terminal Block Installation
  • Page 53 – Rear Signal Connector; Note
  • Page 54 – Rear Signal Connector Signal Descriptions
  • Page 55 – Analog Output Signal Connections; Terminal Blocks
  • Page 56 – Digital I/O Signal Connections; The digital output signal is pin 26.
  • Page 57 – Theory of Operation; SCXIbus Line
  • Page 58 – Timing Requirements and Communication Protocol; Timing Signal; The data acquisition timing signal is SCANCLK.; For output selection time specifications, refer to Appendix A,; Communication Signals; Register Descriptions
  • Page 60 – To write to the Configuration Register, follow these steps:
  • Page 61 – To read from the Module ID Register, follow these steps:
  • Page 62 – Figure 2-19 illustrates a read of the SCXI-1121 Module ID Register.; Programming
  • Page 63 – Functional Overview
  • Page 64 – The major components of the SCXI-1121 are as follows:
  • Page 65 – SCXIbus Connector; Figure 3-2 shows the pin assignments for the SCXIbus connector.
  • Page 66 – SCXIbus Connector Signal Descriptions
  • Page 68 – Digital Interface; 4 metral receptacle and to the data acquisition board via a 50-pin
  • Page 69 – Digital Control Circuitry
  • Page 70 – Analog and Timing Circuitry; Calibration; Figure 3-5 is a diagram of the analog input block.
  • Page 72 – where G; is the overall gain and G; with; B W
  • Page 73 – Excitation Output Channels; Configuration and
  • Page 74 – /4 W precision resistor with tempco less than; Offset Null Adjust; Follow these steps to null the offset of the amplifier channels:
  • Page 75 – Excitation Adjust
  • Page 78 – Refer to the following
  • Page 79 – Scanning Modes; Multiplexed Scanning
  • Page 80 – Single-Module Multiplexed Scanning
  • Page 83 – Register Description; Register Description Format; Module ID Register
  • Page 85 – Bit; CLKOUTEN; is placed in parallel with the
  • Page 86 – RTEMP
  • Page 87 – Slot 0 Register Descriptions
  • Page 89 – Register Writes
  • Page 90 – SCANCONEN
  • Page 91 – FIFO Register; Don’t care bits—Unused.
  • Page 92 – Programming Considerations; Notation; For the bit patterns to be written, the following symbols are used:
  • Page 93 – Register Selection and Write Procedure; SCXIbus
  • Page 94 – For each bit to be written to the Configuration Register:; Initialization
  • Page 95 – Single-Channel Measurements; Parallel Output; Multiplexed Output
  • Page 96 – Indirect Measurements; Measurements from Other Modules
  • Page 97 – Measurements from the SCXI-1121 via Another Module
  • Page 98 – Scanning Measurements; Perform all module programming.; Data Acquisition Board Setup Programming; Posttrigger Data Acquisition with Continuous Channel Scanning
  • Page 100 – Counter 1 and SCANDIV
  • Page 101 – Module Programming
  • Page 102 – Channel Scanning from Other Modules; Channel Scanning from the SCXI-1121 via Another Module
  • Page 103 – Configuration
  • Page 104 – Programming the Slot 0 Hardscan Circuitry
  • Page 105 – Example 3
  • Page 106 – Scanning Examples; Example 1; Slot 0 scan list to the FIFO, consists of the following:; Example 2
  • Page 109 – Specifications; Analog Input; Gain accuracy
  • Page 110 – Rise time
  • Page 111 – RTD Mode; tolerance resistors; Cold-Junction Sensor; Accuracy
  • Page 112 – Physical
  • Page 118 – Further information is given in Chapter 3,
  • Page 122 – Further information is given in Chapter 2,
  • Page 123 – SCXI-1180 feedthrough panel
  • Page 127 – Lab Board Pin
  • Page 128 – Make sure that the computer and the SCXI chassis are turned off.
  • Page 129 – Rear Signal Connector Pin
  • Page 130 – Follow these steps to install the SCXI-1342:; SCXI-1180 Feedthrough Panel
  • Page 131 – Follow these steps to install the SCXI-1180:
  • Page 132 – Connect the wires to the screw terminals.
  • Page 133 – Snap the cover back in place.; Follow these steps to install the SCXI-1302:; Grounding
  • Page 134 – Follow these steps to install the SCXI-1351:; SCXI-1350 Multichassis Adapter
  • Page 135 – Follow these steps to install the SCXI-1350:
  • Page 136 – SCXI-1343 Rear Screw Terminal Adapter; Rear Signal
  • Page 142 – NI Web Support; Online Problem-Solving and Diagnostic Resources
  • Page 143 – Software-Related Resources; Worldwide Support
  • Page 144 – Prefix
  • Page 151 – Index; Numbers
  • Page 152 – writing to Configuration Register,
  • Page 156 – SCXIbus to SCXI-1121 rear signal
  • Page 158 – Slot 0 Register
  • Page 159 – trimmer potentiometer and corresponding
  • Page 162 – Web support from National Instruments,
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SCXI

™

SCXI-1121 User Manual

Four-Channel Isolated Universal Transducer Module
for Signal Conditioning

SCXI-1121 User Manual

September 1999 Edition

Part Number 320426C-01

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Summary

Page 2 - Worldwide Offices

Worldwide Technical Support and Product Information www.natinst.com National Instruments Corporate Headquarters 11500 North Mopac Expressway Austin, Texas 78759-3504 USA Tel: 512 794 0100 Worldwide Offices Australia 03 9879 5166, Austria 0662 45 79 90 0, Belgium 02 757 00 20, Brazil 011 284 5011, Ca...

Page 3 - Important Information; Warranty; Copyright; WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS

Important Information Warranty The SCXI-1121 is warranted against defects in materials and workmanship for a period of one year from the date of shipment, as evidenced by receipts or other documentation. National Instruments will, at its option, repair or replace equipment that proves to be defectiv...

Page 4 - Contents; About This Manual

© National Instruments Corporation v SCXI-1121 User Manual Contents About This Manual Conventions ................................................................................................................... xiRelated Documentation..................................................................

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