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National Instruments AMUX-64T User Manual - Chapter 3

Manual is about: Analog Multiplexer with Temperature Sensor

Summary of AMUX-64T

  • Page 1

    © copyright 1989, 1994 national instruments corporation. All rights reserved. Amux-64t user manual analog multiplexer with temperature sensor november 1994 edition part number 320253b-01.

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    National instruments corporate headquarters 6504 bridge point parkway austin, tx 78730-5039 (512) 794-0100 technical support fax: (800) 328-2203 (512) 794-5678 branch offices: australia (03) 879 9422, austria (0662) 435986, belgium 02/757.00.20, canada (ontario) (519) 622-9310, canada (québec) (514)...

  • Page 3

    Limited warranty the amux-64t 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 defective during the wa...

  • Page 4

    Warning regarding medical and clinical use of national instruments products national instruments products are not designed with components and testing intended to ensure a level of reliability suitable for use in treatment and diagnosis of humans. Applications of national instruments products involv...

  • Page 5: Contents

    © national instruments corporation v amux-64t user manual contents about this manual ............................................................................................................. Ix organization of this manual .............................................................................

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    Contents amux-64t user manual vi © national instruments corporation chapter 4 signal conditioning ............................................................................................................4-1 analog input ................................................................................

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    Contents © national instruments corporation vii amux-64t user manual figures figure 1-1. The relationship between the programming environment, ni-daq, and your hardware ...............................................................................1-4 figure 2-1. Amux-64t parts locator diagram ........

  • Page 8: About This Manual

    © national instruments corporation i x amux-64t user manual about this manual this manual describes the mechanical and electrical aspects of the amux- 64t and contains information about configuring, operating, and programming the amux-64t. The amux-64t is a front-end analog multiplexer that quadrupl...

  • Page 9

    About this manual amux-64t user manual x © national instruments corporation chapter also contains register-level programming information for the mio board. • appendix a, specifications, lists the specifications for the amux-64t. • appendix b, customer communication, contains forms you can use to req...

  • Page 10

    About this manual © national instruments corporation x i amux-64t user manual conventions used in this manual the following conventions are used in this manual: bold italic bold italic text denotes a note, caution, or warning. Italic italic text denotes emphasis, a cross reference, or an introductio...

  • Page 11: Related Documentation

    About this manual amux-64t user manual x i i © national instruments corporation national instruments documentation the amux-64t user manual is one piece of the documentation set for your system. You could have any of several types of manuals, depending on the hardware and software in your system. Us...

  • Page 12: Customer Communication

    About this manual © national instruments corporation x i i i amux-64t user manual in addition, the national instruments daq board user manuals contain information you may find helpful as you read this manual. Customer communication national instruments wants to receive your comments on our products ...

  • Page 13: Chapter 1

    © national instruments corporation 1-1 amux-64t user manual chapter 1 introduction this chapter describes the amux-64t; lists what you need to get started with your amux-64t; describes the software programming choices and optional equipment; and explains how to unpack your amux-64t. About the amux-6...

  • Page 14: Software Programming Choices

    Introduction chapter 1 amux-64t user manual 1-2 © national instruments corporation software programming choices there are four options to choose from when programming your national instruments daq and scxi hardware. You can use labview, labwindows, ni-daq, or register-level programming software. You...

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    Chapter 1 introduction © national instruments corporation 1-3 amux-64t user manual ni-daq has both high-level daq i/o functions for maximum ease of use and low-level data acquisition i/o functions for maximum flexibility and performance. Examples of high-level functions are streaming data to disk or...

  • Page 16

    Introduction chapter 1 amux-64t user manual 1-4 © national instruments corporation labview (pc, macintosh, or sun sparcstation) conventional programming environment (pc, macintosh, or sun sparcstation) ni-daq driver software daq or scxi hardware personal computer or workstation figure 1-1. The relat...

  • Page 17: Optional Equipment

    Chapter 1 introduction © national instruments corporation 1-5 amux-64t user manual 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 ineffi...

  • Page 18: Unpacking

    Introduction chapter 1 amux-64t user manual 1-6 © national instruments corporation for more information about optional equipment available from national instruments, refer to your national instruments catalog or call the office nearest you. Unpacking your amux-64t board is shipped in an antistatic p...

  • Page 19: Chapter 2

    © national instruments corporation 2-1 amux-64t user manual chapter 2 configuration and installation this chapter describes the configuration and installation of your amux-64t. The topics discussed include switch and jumper configuration, connection of the amux-64t to the mio board, power, and signa...

  • Page 20

    Configuration and installation chapter 2 amux-64t user manual 2-2 © national instruments corporation 1 4 2 3 5 6 12 11 10 9 7 8 1 j41 5 u12 9 j1 2 sw1 6 product name and assembly number 10 j2 3 w3 7 serial number 11 j42 4 w2 8 w1 12 temperature sensor figure 2-1. Amux-64t parts locator diagram.

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    Chapter 2 configuration and installation © national instruments corporation 2-3 amux-64t user manual table 2-1. Power supply selection switch description configuration sw1 int position—use this setting to configure the amux-64t to draw +5 v power through the mio board. (factory setting) ext position...

  • Page 22

    Configuration and installation chapter 2 amux-64t user manual 2-4 © national instruments corporation table 2-3. Shield selection jumper description configuration w2 no connect position—use this setting to disconnect the amux-64t analog ground from the shield of a rack-mounted chassis. (factory setti...

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    Chapter 2 configuration and installation © national instruments corporation 2-5 amux-64t user manual table 2-4. Mio board power budget board power allotted power used power remaining total number of amux-64ts that can be powered through mio board at-mio-16 no restriction* 1.5 a 1.0 a (limited by a f...

  • Page 24

    Configuration and installation chapter 2 amux-64t user manual 2-6 © national instruments corporation jumper w3 connects the shield of the 68-position connector to the rack-mount kit. Setting this jumper to the cable shld position connects the shield of the 68-position connector to the metal standoff...

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    Chapter 2 configuration and installation © national instruments corporation 2-7 amux-64t user manual single-board and multiple-board configurations the amux-64t is designed so that up to four amux-64t boards can be daisy-chained and connected to a single mio board, as shown in figure 2-2. You can co...

  • Page 26

    Configuration and installation chapter 2 amux-64t user manual 2-8 © national instruments corporation mio board daisy-chaining cable 50-pin ribbon cable cascade up to four amux-64t boards for a total of 256 single-ended (128 differential) analog input channels mounting holes for standoffs or for moun...

  • Page 27

    Chapter 2 configuration and installation © national instruments corporation 2-9 amux-64t user manual single-board configuration the amux-64t is shipped from the factory with u12 set for single-board configuration as shown in table 2-5. Two-board configuration for the two-board single-ended configura...

  • Page 28: Installation

    Configuration and installation chapter 2 amux-64t user manual 2-10 © national instruments corporation table 2-8. U12 switch settings for four-board configuration board channel address range switches single-ended differential sw1 sw2 sw3 sw4 sw5 board a 0–63 0–31 on on on on off board b 64–127 64–95 ...

  • Page 29: Power-On Sequence

    Chapter 2 configuration and installation © national instruments corporation 2-11 amux-64t user manual power-on sequence if the amux-64t is powered by an external power source, you must turn on power to the amux-64t before turning on the computer. Similarly, you must turn off power to the amux-64t af...

  • Page 30: Chapter 3

    © national instruments corporation 3-1 amux-64t user manual chapter 3 signal connections this chapter describes the amux-64t signal connections and has specifications and connection instructions for the amux-64t connector signals. The following warnings contain important safety information concernin...

  • Page 31

    Signal connections chapter 3 amux-64t user manual 3-2 © national instruments corporation table 3-1. Pin mapping for i/o connectors j1, j2, and j42 50-pin connector (j1 and j2) pin numbers 68-pin connector (j42) pin numbers 1, 2 24, 27, 29, 32, 56, 59, 64, 67 3 68 4 34 5 33 6 66 7 65 8 31 9 30 10 63 ...

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    Chapter 3 signal connections © national instruments corporation 3-3 amux-64t user manual the signals from the amux-64t input connector screw terminals are connected to the mio board via j1, j2, or j42 as shown in figure 3-1. Observe that aisense is connected directly to the mio board aisense pin and...

  • Page 33: Differential Connections

    Signal connections chapter 3 amux-64t user manual 3-4 © national instruments corporation differential connections on the amux-64t, channels 0 through 31 are connected to channels 0 through 7 of the mio board. Amux-64t channels 32 through 63 are connected to channels 8 through 15 of the mio board. If...

  • Page 34

    Chapter 3 signal connections © national instruments corporation 3-5 amux-64t user manual table 3-2. Thermocouple voltage output extremes (mv) 1 thermocouple low high j -8.095 at -210 ° c 2 69.553 at 1,200 ° c 2 k -6.458 at -270 ° c 54.886 at 1,372 ° c e -9.835 at -270 ° c 76.373 at 1,000 ° c t -6.25...

  • Page 35

    Signal connections chapter 3 amux-64t user manual 3-6 © national instruments corporation table 3-3. Nist polynomial coefficients type e e j j t t temp. Range -200 ° c to 0 ° c 0.03 ° c to -0.01 ° c 0 ° c to 1,000 ° c ± 0.02 ° c -210 ° c to 0 ° c 0.0.3 ° c to -0.05 ° c 0 ° c to 760 ° c ± 0.04 ° c -20...

  • Page 36

    Chapter 3 signal connections © national instruments corporation 3-7 amux-64t user manual thermocouple. Since thermocouples are floating signal sources, you must attach a bias return resistor between the negative channel and ground, which is connected to the mio board aignd (analog input ground) pin....

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    Signal connections chapter 3 amux-64t user manual 3-8 © national instruments corporation 2. Translate the reading into the voltage for a j-type thermocouple at that temperature using either a look-up table or an nist polynomial. Notice that the polynomials required here are the inverses of those giv...

  • Page 38

    Chapter 3 signal connections © national instruments corporation 3-9 amux-64t user manual single-ended measurement connect the temperature sensor to channels 0 and 32 by configuring jumper w1 as shown in table 2-2. Connect the positive leads of the thermocouples to any amux-64t input channels except ...

  • Page 39

    Signal connections chapter 3 amux-64t user manual 3-10 © national instruments corporation measurement error is the result of inaccuracies in the mio board. These include gain and offset errors. If the board is properly calibrated, the offset error should be zeroed out. The only remaining error is a ...

  • Page 40: Chapter 4

    © national instruments corporation 4-1 amux-64t user manual chapter 4 signal conditioning this chapter discusses signal conditioning and describes how to build systems such as filters and attenuators for passive analog input signal conditioning. Analog input each differential analog input has seven ...

  • Page 41

    Signal conditioning chapter 4 amux-64t user manual 4-2 © national instruments corporation the components are numbered differently for each channel. Table 4-1 lists the components in each channel and their correspondence to the circuit shown in figure 4-1. Table 4-1. Component positions in each chann...

  • Page 42: Application Notes

    Chapter 4 signal conditioning © national instruments corporation 4-3 amux-64t user manual when the board is shipped, jumpers are inserted in the e and f positions of the input network (see figure 4-1). You can easily remove these jumpers to build analog input signal conditioning circuits. Several ap...

  • Page 43

    Signal conditioning chapter 4 amux-64t user manual 4-4 © national instruments corporation connecting nonreferenced or floating signal sources a floating signal source is a signal source that is not connected in any way to the building ground system, but has an isolated ground-reference point. If an ...

  • Page 44

    Chapter 4 signal conditioning © national instruments corporation 4-5 amux-64t user manual single-ended inputs when measuring floating signal sources, you should configure the mio board to supply a ground reference. Therefore, you should configure the mio board for referenced single-ended input. In t...

  • Page 45

    Signal conditioning chapter 4 amux-64t user manual 4-6 © national instruments corporation building lowpass filters you can easily install simple resistance-capacitance (rc) lowpass filters in the amux-64t board on any differential input channel. The filters are useful for accurate measurement and no...

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    Chapter 4 signal conditioning © national instruments corporation 4-7 amux-64t user manual filter placed on differential input channel 1. If the input signal source is floating, you must place a bias return resistor in the d position (r8 in this case). Do not install rc lowpass filters on the amux-64...

  • Page 48

    Chapter 4 signal conditioning © national instruments corporation 4-9 amux-64t user manual note: highpass filters generally exhibit poorer common-mode rejection characteristics than lowpass filters because capacitors are in the series input paths. Capacitors have poorer tolerances than resistors, and...

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    Signal conditioning chapter 4 amux-64t user manual 4-10 © national instruments corporation computer. Overvoltage can also cause an electric shock hazard for the operator. National instruments is not liable for damage or injury resulting from such misuse. A three-resistor circuit for attenuating volt...

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    Chapter 4 signal conditioning © national instruments corporation 4-11 amux-64t user manual example: using the values in figure 4-7, g = 10 k Ω 10 k Ω + 10 k Ω + 10 k Ω ( ) = 13 therefore, v mio = 1 3 v sc when the mio board is configured for ± 10 v inputs, the board can acquire ± 30 v signals with t...

  • Page 51: Chapter 5

    © national instruments corporation 5-1 amux-64t user manual chapter 5 theory of operation and register-level programming this chapter contains a functional overview of the amux-64t and explains the operation of each functional unit making up the amux-64t. This chapter also contains register-level pr...

  • Page 52

    Theory of operation and register-level programming chapter 5 amux-64t user manual 5-2 © national instruments corporation ch0 ch1 ch2 ch3 jumper w1 ic temperature sensor ch60 ch61 ch62 ch63 multiplexers 64 analog inputs 50-pin i/o connector 16 analog inputs 50-pin i/o connector scanning counter dip s...

  • Page 53

    Chapter 5 theory of operation and register-level programming © national instruments corporation 5-3 amux-64t user manual the dip switch attached to the scanning counter configures the amux-64t for one-board, two-board, or four-board operation. Individual amux-64t boards are selected depending on the...

  • Page 54

    Theory of operation and register-level programming chapter 5 amux-64t user manual 5-4 © national instruments corporation 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...

  • Page 55

    Chapter 5 theory of operation and register-level programming © national instruments corporation 5-5 amux-64t user manual table 5-2. Multiple amux-64t board addressing digital port a bits ado board selected channels selected 00 a 0–63 01 b 64–127 10 c 128–191 11 d 192–255 observe that channels on a s...

  • Page 56

    Theory of operation and register-level programming chapter 5 amux-64t user manual 5-6 © national instruments corporation to perform an a/d conversion on a single amux-64t channel, perform the following programming steps: 1. Select an analog input channel on the amux-64t by writing the appropriate ch...

  • Page 57

    Chapter 5 theory of operation and register-level programming © national instruments corporation 5-7 amux-64t user manual cable ch0 ch1 ch2 ch3 ch4 ch5 ch6 ch7 ch8 ch9 ch10 ch11 ch12 ch13 ch14 ch15 ch0 ch1 ch2 ch3 ch4 ch5 ch6 ch7 ch8 ch9 ch10 ch11 ch32 ch33 ch34 ch35 ch60 ch61 ch62 ch63 . . . . . . 6...

  • Page 58

    Theory of operation and register-level programming chapter 5 amux-64t user manual 5-8 © national instruments corporation 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. Scanning order single board conf...

  • Page 59: Scanning Order

    Chapter 5 theory of operation and register-level programming © national instruments corporation 5-9 amux-64t user manual scanning order the order in which channels are scanned depends on the contents of the mux-gain memory. The mux-gain memory on the mio board can be loaded with a sequence to scan t...

  • Page 60

    Theory of operation and register-level programming chapter 5 amux-64t user manual 5-10 © national instruments corporation if the mio board is programmed with a sequential channel scan sequence (0 through 7 or 0 through 15) the amux-64t channels are scanned from top to bottom in the order given in ta...

  • Page 61

    Chapter 5 theory of operation and register-level programming © national instruments corporation 5-11 amux-64t user manual • write the divide-down value to the am9513 data register to load counter 4. The divide- down values are as follows: – one amux-64t board: 4 (hex) – two amux-64t boards: 8 (hex) ...

  • Page 62: Appendix A

    © national instruments corporation a-1 amux-64t user manual appendix a specifications this appendix lists the specifications of the amux-64t. These specifications are typical at 25 ° c unless otherwise noted. Analog input input characteristics number of channels single board ...........................

  • Page 63

    Specifications appendix a amux-64t user manual a-2 © national instruments corporation four amux-64t boards gain at-mio-16e-2 at-mio-16e-10 nb-mio-16 ± fs 0 to +fs ± fs 0 to +fs ± fs 0 to +fs .5 8 8 13 12 — — 1 8 8 13 12 25 12 2 9 8 13 12 — — 5 9 9 13 12 — — 10 9 9 13 12 50 30 20 11 10 14 13 — — 50 1...

  • Page 64: Appendix B

    © national instruments corporation b-1 amux-64t user manual appendix b customer communication for your convenience, this appendix contains forms to help you gather the information necessary to help us solve technical problems you might have as well as a form you can use to comment on the product doc...

  • Page 65: Technical Support Form

    Technical support form ____________________________________________________ photocopy this form and update it each time you make changes to your software or hardware, and use the completed copy of this form as a reference for your current configuration. Completing this form accurately before contact...

  • Page 66: Configuration Form

    Amux-64t hardware and software configuration form record the settings and revisions of your hardware and software on the line to the right of each item. 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 co...

  • Page 67: Documentation Comment Form

    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: november 1994 part number: 320253b-01 please comment on the comp...

  • Page 68: Glossary

    © national instruments corporation glossary-1 amux-64t user manual glossary prefix meaning value p- pico- 10 -12 n- nano- 10 -9 µ - micro- 10 -6 m- milli- 10 -3 k- kilo- 10 3 m- mega- 10 6 ˚ degrees > greater than ≥ greater than or equal to less than - negative of, or minus Ω ohms % percent ± plus o...

  • Page 69

    Glossary amux-64t user manual glossary-2 © national instruments corporation dc direct current dgnd digital ground signal diff differential din deutsche industrie norme dip dual-inline package dma direct memory access eeprom electrically erased programmable read-only memory epp enhanced parallel port...

  • Page 70

    Glossary © national instruments corporation glossary-3 amux-64t user manual up/bp* unipolar/bipolar bit v volts v ± in positive/negative input voltage v cm common-mode noise v diff differential input voltage vdc volts direct current v ext external voltage vi virtual instrument v m measured voltage v...

  • Page 71: Index

    © national instruments corporation index-1 amux-64t user manual index numbers 2-board configuration. See two-board configuration. 4-board configuration. See four-board configuration. A a/d, vi conversions on a single analog input channel, 4-6 accuracies, thermocouple measurements, 2-19 active overvo...

  • Page 72

    Index amux-64t user manual index-2 © national instruments corporation temperature sensor selection (table), 2-3 connections. See also differential connections, floating signal sources, signal connections. Additional information, 2-19 connectors, 3-19 j1 and j2, pinout, 2-10 custom cables, 1-5 custom...

  • Page 73

    Index © national instruments corporation index-3 amux-64t user manual differential channel 1, 3-7 normalized frequency response, 3-6 lsb, vi m manual. See documentation. Mc-mio-16. See mio board. Measurements, thermocouple. See thermocouple measurements. Mio board command register 1 scandiv bit, 4-1...

  • Page 74

    Index amux-64t user manual index-4 © national instruments corporation single-ended connections for floating signal sources, 3-10 rtsi, vi s scandiv bit, 4-11 scanning clock, mio board, 4-10 counter control bits, 4-3 initializing, 4-10 order, 4-8 to 4-10 four-board configuration, 4-9 mio board input ...

  • Page 75

    Index © national instruments corporation index-5 amux-64t user manual v vdc, vi voltage dividers. See attenuators. W w1 jumper settings, 2-8 w2 jumper settings, 2-9 what you need to get started, 1-1.