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National Instruments AT-MIO-16F-5 User Manual

National Instruments AT-MIO-16F-5 User Manual

Analog multiplexer with temperature sensor
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  • Page 1 AT-MIO-16F-5...
  • Page 2 AMUX-64T User Manual Analog Multiplexer with Temperature Sensor AMUX-64T User Manual January 1999 Edition Part Number 320253C-01...
  • Page 3 Singapore 2265886, Spain 91 640 0085, Sweden 08 730 49 70, Switzerland 056 200 51 51, Taiwan 02 377 1200, United Kingdom 01635 523545 National Instruments Corporate Headquarters 6504 Bridge Point Parkway Austin, Texas 78730-5039 USA Tel: 512 794 0100 © Copyright 1989, 1999 National Instruments Corporation. All rights reserved.
  • Page 4 90 days from date of shipment, as evidenced by receipts or other documentation. National Instruments will, at its option, repair or replace software media that do not execute programming instructions if National Instruments receives notice of such defects during the warranty period.

  • Page 5: Table Of Contents

    Contents About This Manual Organization of This Manual ..................ix Conventions Used in This Manual.................x National Instruments Documentation ................xi Related Documentation....................xi Customer Communication .....................xii Chapter 1 Introduction About the AMUX-64T....................1-1 What You Need to Get Started ..................1-2 Unpacking ........................1-2 Software Programming Choices..............1-2 LabVIEW and LabWindows Application Software........1-3...
  • Page 6 Programming Channel Scanning with the AMUX-64T..........5-11 Initialize the AMUX-64T Scanning Counter..........5-11 Configure Counter 1 to Control the MIO Board Scanning Clock ....5-12 Set the SCANDIV Bit in MIO Command Register 1 ........5-12 AMUX-64T User Manual © National Instruments Corporation...
  • Page 7 Two-Level Multiplexer Arrangement Showing Channel 9 Selected ..5-7 Figure 5-5. Scanning Order for Different AMUX-64T Board Configurations..5-9 Tables Table 2-1. Power Supply Selection.................2-3 Table 2-2. Temperature Sensor Selection...............2-3 Table 2-3. Shield Selection..................2-4 Table 2-4. MIO Board Power Budget..............2-5 © National Instruments Corporation AMUX-64T User Manual...
  • Page 8 Component Positions in Each Channel ..........4-2 Table 5-1. AMUX-64T Channel Selection ............5-4 Table 5-2. Multiple AMUX-64T Board Addressing..........5-5 Table 5-3. AMUX-64T Scanning Order for Each MIO Board Input Channel ..5-10 AMUX-64T User Manual viii © National Instruments Corporation...

  • Page 9: About This Manual

    AMUX-64T. The AMUX-64T is a front-end analog multiplexer that quadruples the number of analog input signals that can be digitized with a National Instruments MIO board (except the AT-MIO-64). The AMUX-64T also has an integrated circuit temperature sensor that can...

  • Page 10: Conventions Used In This Manual

    About This Manual • Appendix B, Customer Communication, contains forms you can use to request help from National Instruments or to comment on our products and manuals. • Glossary contains an alphabetical list and description of terms used in this manual, including abbreviations, acronyms, metric prefixes, mnemonics, and symbols.

  • Page 11: National Instruments Documentation

    Based on the ITS-90, National Institute of Standards and Technology, 1993 The following document contains information you may find helpful as you read this manual and is available from National Instruments upon request: • Application Note 043, Measuring Temperature with Thermocouples In addition, the National Instruments DAQ board user manuals contain information you may find helpful as you read this manual.

  • Page 12: Customer Communication

    About This Manual Customer Communication National Instruments wants to receive your comments on our products and manuals. We are interested in the applications you develop with our products, and we want to help if you have problems with them. To make it easy for you to contact us, this manual contains comment and configuration forms for you to complete.

  • Page 13: Introduction

    19-in. rack. You can configure the AMUX-64T to draw power from the MIO board or from an external +5 V supply. A red LED indicates when the board is powered on. Input signal leads are attached at screw terminals. © National Instruments Corporation AMUX-64T User Manual...

  • Page 14: What You Need To Get Started

    • Remove the device from the package and inspect the device for loose components or any other sign of damage. Notify National Instruments if the device appears damaged in any way. Do not install or connect a damaged device in your computer or to your MIO device.

  • Page 15: Labview And Labwindows Application Software

    ANSI standard C programming language. The LabWindows Data Acquisition Library, a series of functions for using LabWindows with National Instruments DAQ hardware, is included with the NI-DAQ software kit. The LabWindows Data Acquisition libraries are functionally equivalent to the NI-DAQ software except that the SCXI functions are not included in the LabWindows/CVI software for Sun.
  • Page 16 An example of a low-level function is writing directly to registers on the data acquisition device. NI-DAQ does not sacrifice the performance of National Instruments data acquisition devices because it lets multiple devices operate at their peak performance—up to 500 kS/s on ISA computers and up to 1 MS/s on...

  • Page 17: Figure 1-1. The Relationship Between The Programming Environment, Ni-Daq, And Your Hardware

    Figure 1-1. The Relationship between the Programming Environment, NI-DAQ, and Your Hardware The National Instruments PC, AT, MC, DAQCard, and DAQPad Series DAQ hardware is packaged with NI-DAQ software for PC compatibles. NI-DAQ software for PC compatibles comes with language interfaces for...

  • Page 18: Register-Level Programming

    Chapter 1 Introduction The National Instruments SB Series DAQ boards are packaged with NI-DAQ software for Sun, which comes with a language interface for ANSI C. Register-Level Programming The final option for programming any National Instruments DAQ hardware is to write register-level software. Writing register-level programming software can be very time-consuming and inefficient, and is not recommended for most users.

  • Page 19: Optional Equipment

    Rack-mount kit with acrylic plastic cover (single- or double-height) • Rack-mount kit with metal wraparound cover (single- or double-height) For more information about optional equipment available from National Instruments, refer to your National Instruments catalog or call the office nearest you. © National Instruments Corporation AMUX-64T User Manual...

  • Page 20: Configuration And Installation

    Power, Temperature Sensor, and Shield Configuration To configure the AMUX-64T board, use the three user-configurable jumpers (W1–W3) shown in the parts locator diagram, Figure 2-1. Tables 2-1 to 2-3 list the description and configuration of the user-configurable jumpers. © National Instruments Corporation AMUX-64T User Manual...

  • Page 21: Figure 2-1. Amux-64T Parts Locator Diagram

    5 J42 9 W2 2 J1 6 Temperature Sensor 10 W3 3 W1 7 Product Name and Assembly Number 11 SW1 4 J2 8 U12 12 J41 Figure 2-1. AMUX-64T Parts Locator Diagram AMUX-64T User Manual © National Instruments Corporation...

  • Page 22: Table 2-1. Power Supply Selection

    CH0 and CH32 position—Use this setting to select CH0 and CH32. (factory setting) CH32 Temp Channel 0 and 32 Selected (Factory Setting) Temp position—Use this setting to select the temperature sensor. CH32 Temp Temperature Sensor Selected © National Instruments Corporation AMUX-64T User Manual...

  • Page 23: Supplementary Configuration Information

    Set SW1 to the INT position to power the AMUX-64T by drawing power through the MIO board. Set SW1 to the EXT position to draw power from an external +5 V source connected to J41. AMUX-64T User Manual © National Instruments Corporation...

  • Page 24: Temperature Sensor

    This sensor is a National Semiconductor LM-35CZ that provides a voltage output of 10 m V/°C, with an accuracy of ±1 °C. The sensor is jumper-selected on differential input channel 0. © National Instruments Corporation AMUX-64T User Manual...

  • Page 25: Shield Selection

    Ground the rack via a ground strap or other recommended ways. You may ground it using jumper W3. In general, you will get the best results if all grounds and shields have exactly one conduction path to earth ground. AMUX-64T User Manual © National Instruments Corporation...

  • Page 26: Single-Board And Multiple-Board Configurations

    SW1 SW2 SW3 SW4 SW5 single-board OFF OFF OFF OFF OFF configuration. (factory setting). U12—Set for two-board configuration. Board A Board B U12—Set for four-board configuration. Board A Board B Board C Board D © National Instruments Corporation AMUX-64T User Manual...

  • Page 27: Figure 2-2. Daisy-Chaining Multiple Amux-64T Boards

    Therefore, each board is assigned a different channel address range determined by the configuration of switch U12. The switch settings for each board configuration are given in the following sections. AMUX-64T User Manual © National Instruments Corporation...

  • Page 28: Single-Board Configuration

    C; and the board that you assign addresses 192 through 255 (or 96 through 127) is referred to as board D. You can configure any board as board A, board B, board C, or board D, as shown in Table 2-8. © National Instruments Corporation AMUX-64T User Manual...

  • Page 29: Installation

    You can install the AMUX-64T into a 19-in. rack-mount kit as shown in Figure 2-3. If you use a round 68-pin shielded cable, route the cable as shown, leaving passage for the ribbon cable (if you use it for daisy-chaining) in the other direction. AMUX-64T User Manual 2-10 © National Instruments Corporation...

  • Page 30: Power-On Sequence

    AMUX-64T before turning on the computer. Similarly, you must turn off power to the AMUX-64T after turning off the computer. The red LED, labeled D2, indicates when power is applied to the board. © National Instruments Corporation 2-11 AMUX-64T User Manual...

  • Page 31: Signal Connections

    . Because of the danger of O NOT SUBSTITUTE PARTS OR MODIFY EQUIPMENT introducing additional hazards, do not install unauthorized parts or modify the board. Return the board to National Instruments for service and repair to ensure that its safety features are not compromised. Caution connect a signal to screw terminals CH0–CH63 that violates their...
  • Page 32 (J1 and J2) Pin Numbers Pin Numbers 1, 2 24, 27, 29, 32, 56, 59, 64, 67 54, 55 24, 33 4, 7, 9, 12, 13, 15, 18, 35, 36, 39, 44, 50, 53 AMUX-64T User Manual © National Instruments Corporation...
  • Page 33 Chapter 3 Signal Connections Table 3-1. Pin Mapping for I/O Connectors J1, J2, and J42 (Continued) 50-Pin Connector 68-Pin Connector (J42) (J1 and J2) Pin Numbers Pin Numbers 34, 35 8, 14 © National Instruments Corporation AMUX-64T User Manual...

  • Page 34: Figure 3-1. Amux-64T Signal Routing

    CH32 CH33 ACH8 CH34 CH35 CH36 CH37 ACH9 CH38 CH39 CH60 CH61 ACH15 CH62 CH63 AISENSE AISENSE Screw Terminals J1, J2, and J42 Connectors on AMUX-64T on AMUX-64T Figure 3-1. AMUX-64T Signal Routing AMUX-64T User Manual © National Instruments Corporation...

  • Page 35: Differential Connections

    If you are using the thermocouples in a known temperature range, consult a book of thermocouple tables to determine the approximate millivolt output and the best gain and input range settings. © National Instruments Corporation AMUX-64T User Manual...

  • Page 36: Linearizing The Data

    AMUX-64T screw terminals in degrees Celsius, and a through a are coefficients that are specific to each thermocouple type. To speed computation time, a polynomial should be AMUX-64T User Manual © National Instruments Corporation...
  • Page 37 Table 3-3 lists the National Institute of Standards and Technology (NIST) polynomial coefficients for several popular thermocouples. © National Instruments Corporation AMUX-64T User Manual...
  • Page 38 Table 3-3. NIST Polynomial Coefficients Type °C °C °C °C Temp. –200 °C to 0 °C to 1,000 –210 °C to 0 °C 0 °C to 760 °C –200 °C to 0 °C to 400 °C °C Range 0.0°3 C to –0.01 °C ±...

  • Page 39: Differential Measurements

    Therefore, you could select either a ±5 V input range with a gain of 100 (±50 mV maximum signal) or a ±10 V input range with a gain of 500 (±20 mV maximum signal). In this case, the ±10 V © National Instruments Corporation AMUX-64T User Manual...

  • Page 40: Procedure 1

    J-type thermocouple is 10.667 mV. By applying the third formula in the Linearizing the Data section and using the coefficients from Table 3-3, you can calculate that the temperature is 198 °C. AMUX-64T User Manual 3-10 © National Instruments Corporation...

  • Page 41: Procedure 2

    Configure the MIO board for ground-referenced, single-ended inputs. For more information about signal sources and their connections, see the Signal Connections chapter of the user manual that came with your MIO board. © National Instruments Corporation 3-11 AMUX-64T User Manual...

  • Page 42: Using More Than One Amux-64T

    ±10 V and the gain is 500, gain error will contribute 0.0008 x 20 mV, or 16 µV of error. If the Seebeck coefficient of a thermocouple is 32 µV/±C, this measurement error will add 0.5 °C of uncertainty to the measurement. AMUX-64T User Manual 3-12 © National Instruments Corporation...

  • Page 43: Thermocouple Measurement Accuracies

    ±10 V input range. Table 3-4. Thermocouple Measurement Accuracies Type Gain ±2.7 °C ±3.7 °C ±2.9 °C ±3.6 °C ±9.8 °C ±8.5 °C ±1.4 °C ±2.1 °C ±1.8 °C ±1.9 °C ±3.6 °C ±2.9 °C © National Instruments Corporation 3-13 AMUX-64T User Manual...

  • Page 44: Other Connection Considerations

    Refer to the sections titled Analog Input Signal Connections and Cabling and Field Wiring in the Signal Connections chapter of the user manual that came with your MIO board for additional signal connection information. AMUX-64T User Manual 3-14 © National Instruments Corporation...

  • Page 45: Signal Conditioning

    For specific applications illustrating signal conditioning with both single-ended and differential inputs, refer to Application Notes later in this chapter. © National Instruments Corporation AMUX-64T User Manual...

  • Page 46: Figure 4-1. Onboard Equivalent Circuit

    Figure 4-1. Table 4-1. Component Positions in Each Channel Channel (Positions in Figure 4-1) Differential Single-Channel (0, 32) (1, 33) (2, 34) (3, 35) (4, 36) (5, 37) AMUX-64T User Manual © National Instruments Corporation...
  • Page 47 R116 (26, 58) R169 R170 R171 R172 R117 R118 (27, 59) R173 R174 R175 R176 R119 R120 (28, 60) R177 R178 R179 R180 R121 R122 (29, 61) R181 R182 R183 R184 R123 R124 © National Instruments Corporation AMUX-64T User Manual...

  • Page 48: Application Notes

    To desolder on the AMUX-64T, use vacuum-type tools for best results. Use care when desoldering to avoid damaging component pads. You should use only rosin-core electronic-grade solder. Acid-core solder damages the printed circuit board and components. AMUX-64T User Manual © National Instruments Corporation...

  • Page 49: Channel Configurations

    (the D position in Table 4-1). You can build additional signal conditioning circuitry, such as filters and attenuators (described in Building Lowpass Filters, Building Highpass Filters, and Building Attenuators (Voltage Dividers) later in this chapter), in the open component positions. © National Instruments Corporation AMUX-64T User Manual...

  • Page 50: Single-Ended Inputs

    AIGND. You can build signal conditioning circuitry such as filters and attenuators (described in Building Lowpass Filters, Building Highpass Filters, and Building Attenuators (Voltage later in this chapter) in the open component positions. Dividers) AMUX-64T User Manual © National Instruments Corporation...

  • Page 51: Connecting Ground-Referenced Signal Sources

    CH0–CH63 that violates their EVER overvoltage protection limits. When the AMUX-64T is powered on, the screw terminals CH0–CH63 overvoltage protection is ±35 V; when the AMUX-64T is powered off, overvoltage protection is ±20 V. © National Instruments Corporation AMUX-64T User Manual...

  • Page 52: Building Lowpass Filters

    You must also choose the filter component values. You can select the resistance or the capacitance arbitrarily; one value determines the other. Picking the capacitor first and letting its value determine the resistance required is preferable because more standard resistor values are available. AMUX-64T User Manual © National Instruments Corporation...
  • Page 53 E and F. The closest standard 5% tolerance resistors are 20 kΩ. The closest standard 0.5% resistors are 19.8 kΩ. National Instruments recommends using 1% or better tolerance resistors in this application because differences between the resistor values degrade the common-mode rejection ratio.

  • Page 54: Building Highpass Filters

    You must also choose the filter component values. You can select the resistance or the capacitance arbitrarily; one value determines the other. Picking the capacitor first and letting its value determine the resistance required is preferable because more standard resistor values are available. AMUX-64T User Manual 4-10 © National Instruments Corporation...
  • Page 55 Do not install RC highpass filters on the AMUX-64T board open component locations when the MIO board is configured for single-ended inputs. © National Instruments Corporation 4-11 AMUX-64T User Manual...

  • Page 56: Building Attenuators (Voltage Dividers)

    AMUX-64T board, any and all boards connected to it, and the host computer. Overvoltage can also cause an electric shock hazard for the operator. National Instruments is liable for damage or injury resulting from such misuse. AMUX-64T User Manual 4-12 © National Instruments Corporation...

  • Page 57: Figure 4-7. Attenuator For Use With Differential Inputs

    Channel 33 F R68 (–in) D R8 10 kΩ Resistor Input Schematic + Channel 10 kΩ MIO board 10 kΩ 10 kΩ – Channel – Figure 4-7. Attenuator for Use with Differential Inputs © National Instruments Corporation 4-13 AMUX-64T User Manual...
  • Page 58 -- - 10 kΩ 10 kΩ 10 kΩ Therefore, -- - V When the MIO board is configured for ±10 V inputs, the board can acquire ±30 V signals with this attenuator circuit. AMUX-64T User Manual 4-14 © National Instruments Corporation...

  • Page 59: Theory Of Operation And Register-Level Programming

    Figure 5-1 shows the block diagram of the AMUX-64T. The AMUX-64T contains 16 CMOS four-to-one analog multiplexers for a total of 64 channels. Each analog multiplexer expands a single MIO analog input channel to four AMUX-64T analog input channels. © National Instruments Corporation AMUX-64T User Manual...

  • Page 60: Figure 5-1. Amux-64T Block Diagram

    EXTSTROBE* loads the value at digital I/O port A into the AMUX-64T scanning counter. The MIO signal SCANCLK, which is active during scanned data acquisition, switches the input channels automatically on the AMUX-64T after each A/D conversion. AMUX-64T User Manual © National Instruments Corporation...

  • Page 61: How To Address Amux-64T Analog Input Channels

    Bits ADO0 and ADO1 address each four-to-one multiplexer on the AMUX-64T and work in combination with the MIO Mux-Gain Register (the Mux-Mem Register in the AT-MIO-16F-5) to select the analog input channel. An address map for selecting analog input channels on a single AMUX-64T is shown in Table 5-1.
  • Page 62 ADO<1..0> 0000 0000 0000 0000 0001 0001 0001 0001 — — — — — — 0111 0111 0111 0111 1000 1000 1000 1000 — — — — — — 1111 1111 1111 1111 AMUX-64T User Manual © National Instruments Corporation...
  • Page 63 0 to 255, eight bits are required to address any single channel. This 8-bit address must be split and written to the Digital Output Register and the Mux-Gain Register (the Mux-Mem Register in the AT-MIO-16F-5). Figure 5-3 shows the mapping of the 8-bit channel address to the Digital Output and Mux-Gain Registers.

  • Page 64: Figure 5-3. Amux-64T Channel Address Mapping

    A/D conversions on a single input channel of the MIO board with one exception—the bits MA<3..0> of the Mux-Gain Register must correspond to the middle four bits of your channel address shown in Figure 5-3. AMUX-64T User Manual © National Instruments Corporation...

  • Page 65: Automatic Channel Scanning With The Amux-64T

    – CH11 CH10 CH11 CH32 CH12 CH33 CH13 CH34 CH14 CH35 CH15 CH60 CH61 CH62 Cable CH63 64-to-16 Multiplexer 16-to-1 Multiplexer MIO board AMUX-64T Figure 5-4. Two-Level Multiplexer Arrangement Showing Channel 9 Selected © National Instruments Corporation AMUX-64T User Manual...
  • Page 66 A are scanned first, followed by the first four channels on board B, the first four channels on board C, and finally the first four channels on board D. AMUX-64T User Manual © National Instruments Corporation...

  • Page 67: Figure 5-5. Scanning Order For Different Amux-64T Board Configurations

    CH3 (131) CH0 (192) CH1 (193) Board D CH2 (194) CH3 (195) Channel Number as Addressed from MIO Board Channel Number as Labeled on AMUX-64T Figure 5-5. Scanning Order for Different AMUX-64T Board Configurations © National Instruments Corporation AMUX-64T User Manual...

  • Page 68: Scanning Order

    44–47 108–111 172–175 236–239 48–51 48–51 112–115 48–51 112–115 176–179 240–243 52–55 52–55 116–119 52–55 116–119 180–183 244–247 56–59 56–59 120–123 56–59 120–123 184–187 248–251 60–63 60–63 124–127 60–63 124–127 188–191 252–255 AMUX-64T User Manual 5-10 © National Instruments Corporation...

  • Page 69: Programming Channel Scanning With The Amux-64T

    To initialize the AMUX-64T scanning counter, use the following programming sequence: Write 0 to digital I/O port A. Write to the External Strobe Register to load 0 into the AMUX-64T scanning counter. © National Instruments Corporation 5-11 AMUX-64T User Manual...

  • Page 70: Configure Counter 1 To Control The Mio Board Scanning Clock

    Set the SCANDIV Bit in MIO Command Register 1 To enable SCANCLK division, set the SCANDIV bit in Command Register 1. After this programming sequence, the analog inputs on the AMUX-64T are automatically scanned during MIO-scanned A/D conversion operations. AMUX-64T User Manual 5-12 © National Instruments Corporation...
  • Page 71 Max working voltage (signal + common mode) ....... Each input should remain within ±12 V of ground Active overvoltage protection (CH0–CH63) .......... ±35 V powered on ±20 V powered off On resistance .......... 1 kΩ © National Instruments Corporation AMUX-64T User Manual...
  • Page 72 Two AMUX-64T Boards AT-MIO-16E-2 AT-MIO-16E-10 NB-MIO-16 Gain ±FS 0 to +FS ±FS 0 to +FS ±FS 0 to +FS — — — — — — — — — — — — — — AMUX-64T User Manual © National Instruments Corporation...
  • Page 73 From computer through MIO board or external power +5 VDC (±5%)........ 150 mA typ Physical Dimensions..........12.75 by 3.80 in (32.43 by 9.65 cm) I/O connector.......... Two 50-pin male ribbon-cable connectors, one 68-pin male shielded or ribbon-cable connector 78-screw terminals © National Instruments Corporation AMUX-64T User Manual...
  • Page 74 Appendix A Specifications Environment Operating temperature ......0° to 70 °C Storage temperature ........–55° to 150 °C Relative humidity ........5% to 90% noncondensing AMUX-64T User Manual © National Instruments Corporation...

  • Page 75: Customer Communication

    Electronic Services Bulletin Board Support National Instruments has BBS and FTP sites dedicated for 24-hour support with a collection of files and documents to answer most common customer questions. From these sites, you can also download the latest instrument drivers, updates, and example programs. For recorded instructions on how to use the bulletin board and FTP services and for BBS automated information, call 512 795 6990.
  • Page 76 Telephone and Fax Support National Instruments has branch offices all over the world. Use the list below to find the technical support number for your country. If there is no National Instruments office in your country, contact the source from which you purchased your software to obtain support.
  • Page 77 National Instruments for technical support helps our applications engineers answer your questions more efficiently. If you are using any National Instruments hardware or software products related to this problem, include the configuration forms from their user manuals. Include additional pages if necessary.
  • Page 78 Complete a new copy of this form each time you revise your software or hardware configuration, and use this form as a reference for your current configuration. Completing this form accurately before contacting National Instruments for technical support helps our applications engineers answer your questions more efficiently.
  • Page 79 Documentation Comment Form National Instruments encourages you to comment on the documentation supplied with our products. This information helps us provide quality products to meet your needs. Title: AMUX-64T User Manual Edition Date: January 1999 Part Number: 320253C-01 Please comment on the completeness, clarity, and organization of the manual.

  • Page 80: Glossary

    Ω ohms percent ± plus or minus positive of, or plus +5 V +5 Volts signal amperes ACH <0..7> Analog Channel 0 through 7 signals ACK* Acknowledge Input signal analog-to-digital © National Instruments Corporation AMUX-64T User Manual...
  • Page 81 DAC0OUT, DAC1OUT Digital-to-Analog Converter 0, 1 Output signals data acquisition DAQD*/A Data Acquisition Board Data/Address Line signal DATA Data Lines at the Specified Port signal decibels direct current DGND Digital Ground signal DIFF differential AMUX-64T User Manual © National Instruments Corporation...
  • Page 82 EXTTRIG External Trigger signal EXTUPDATE* External Update signal feet GATB <0..2> Counter B0, B1, B2 Gate signals hexadecimal Input Buffer Full signal inches INTR Interrupt Request signal input/output light-emitting diode least significant bit © National Instruments Corporation AMUX-64T User Manual...
  • Page 83 Counter B0, B1 Output signals PA, PB, PC <0..7> Port A, B, or C 0 through 7 signals POSTTRIG Posttrigger mode PRETRIG Pretrigger mode resistance-capacitance Read signal external resistance referenced single-ended RTSI Real-Time System Integration AMUX-64T User Manual © National Instruments Corporation...
  • Page 84 Serial Peripheral Interface Clock signal Slot-select signal Strobe Input signal transistor-transistor logic typical UP/BP* Unipolar/bipolar bit volts V± positive/negative input voltage common-mode noise differential input voltage diff volts direct current external voltage virtual instrument measured voltage © National Instruments Corporation AMUX-64T User Manual...
  • Page 85 Glossary volts, root-mean-square signal source watts WRT* Write signal AMUX-64T User Manual © National Instruments Corporation...
  • Page 86 A/D conversions on single analog input attenuators for use with differential inputs channel, 5-3 to 5-6 (figure), 4-13 channel address mapping (figure), 5-6 input voltage greater than 42 V channel selection (table), 5-4 (warning), 4-12 © National Instruments Corporation AMUX-64T User Manual...
  • Page 87 (table), 2-10 documentation jumpers and switches on AMUX-64T, 2-1 conventions used in manual, x multiple board configuration National Instruments documentation, xi channel ranges for multiple boards organization of manual, ix-x (table), 2-8 related documentation, xi daisy-chaining multiple boards...
  • Page 88 1-3 pin mapping. See I/O connector (J1, J2, and linearizing thermocouple data, 3-6 to 3-9 J42). lowpass filters polynomial coefficients for thermocouples building, 4-8 to 4-9 (table), 3-8 power requirement specifications, A-3 © National Instruments Corporation AMUX-64T User Manual...
  • Page 89 (table), 3-2 to 3-3 (table), 4-2 to 4-4 other connection considerations, 3-14 onboard equivalent circuit thermocouple measurements using (figure), 4-2 AMUX-64T, 3-5 to 3-13 application notes, 4-4 to 4-14 differential measurements, 3-9 AMUX-64T User Manual © National Instruments Corporation...
  • Page 90 (table), 3-8 environment, A-4 selecting gain and input ranges, 3-5 to 3-6 physical, A-3 single-ended measurement, 3-11 power requirement, A-3 sources of error, 3-12 to 3-13 switch settings. See configuration. thermocouple measurement accuracies, 3-13 © National Instruments Corporation AMUX-64T User Manual...
  • Page 91 Index thermocouple output extremes (table), 3-6 using more than one AMUX-64T, 3-12 unpacking the AMUX-64T, 1-2 voltage dividers. See attenuators (voltage dividers), building. AMUX-64T User Manual © National Instruments Corporation...

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