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National Instruments SC-2040 manual

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Table of contents for the manual

  • Page 1

    © Copyright 1994 National Instruments Corporation. All Rights Reserved. SC-2040 User Manual Eight-Channel Simultaneous Sample-and-Hold Accessory September 1994 Edition Part Number 3 71191 A-01[...]

  • Page 2

    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) 694-8521, Denmark 45 76 26 00, Finland (90) 527 [...]

  • Page 3

    Limited Warranty The SC-2040 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 warranty period. This warranty includes parts and lab[...]

  • 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 involving medical or clinical treatment can create a pot[...]

  • Page 5

    © National Instruments Corporation v SC-2040 User Manual Contents About This Manual ................................................................................................................ ix Organization of This Manual ............................................................................................ ix Conventions Used in This [...]

  • Page 6

    Contents SC-2040 User Manual v i © National Instruments Corporation Chapter 4 Theory of Operation .......................................................................................................... 4-1 Functional Overview ...................................................................................................... 4-1 Analog Circui[...]

  • Page 7

    Contents © National Instruments Corporation v i i SC-2040 User Manual Figures Figure 1-1. The Relationship between the Programming Environment, NI-DAQ, and Your Hardware ............................................................................. 1-3 Figure 2-1. SC-2040 Parts Locator Diagram........................................................[...]

  • Page 8

    © National Instruments Corporation i x SC-2040 User Manual About This Manual This manual describes the electrical and mechanical aspects of the SC-2040 and contains information concerning its configuration and operation. The SC-2040 is an eight-channel simultaneously sampling differential amplifier for the National Instruments MIO-16E Series DAQ b[...]

  • Page 9

    About This Manual SC-2040 User Manual x © National Instruments Corporation 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 introduction to a key concept. MIO-16E MIO-16E refers to the N[...]

  • Page 10

    About This Manual © National Instruments Corporation x i SC-2040 User Manual Related Documentation The following document contains information that you may find helpful as you read this manual: • Your DAQ hardware user manual Customer Communication National Instruments wants to receive your comments on our products and manuals. We are interested[...]

  • Page 11

    © National Instruments Corporation 1- 1 SC -2040 User Manual Chapter 1 Introduction This chapter describes the SC -2040, lists what you need to get started with your SC-2040, describes the optional software and optional equipment, and explains how to unpack your SC -2040. About the SC-2040 The SC-2040 is an eight-channel simultaneously sampling di[...]

  • Page 12

    Introduction Chapter 1 SC -2040 User Manual 1- 2 © National Instruments Corporation Software Programming Choices Your SC-2040 kit does not include software. 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. The SC-[...]

  • Page 13

    Chapter 1 Introduction © National Instruments Corporation 1- 3 SC -2040 User Manual NI-DAQ also internally addresses many of the complex issues between the computer and the DAQ hardware such as programming interrupts and DMA controllers. NI-DAQ maintains a consistent software interface among its different versions so that you can change platforms [...]

  • Page 14

    Introduction Chapter 1 SC -2040 User Manual 1- 4 © National Instruments Corporation Register-Level Programming There are no register-level programming concerns for the SC-2040. When using the SC -2040, only the MIO-16E Series board needs to be programmed. Refer to your MIO-16E board manual for further information on register-level programming. Opt[...]

  • Page 15

    © National Instruments Corporation 2- 1 SC -2040 User Manual Chapter 2 Configuration and Installation This chapter describes the configuration and installation of your SC-2040. The topics discussed are switch and jumper configuration, connection of the SC-2040 to the MIO-16E, and the power- on sequence for your SC -2040 configuration. Board Config[...]

  • Page 16

    Configuration and Installation Chapter 2 SC -2040 User Manu al 2- 2 © National Instruments Corporation Figure 2-1. SC-2040 Parts Locator Diagram[...]

  • Page 17

    Chapter 2 Configuration and Installation © National Instruments Corporation 2- 3 SC-2040 User Manual The SC-2040 has one switch that controls whether the board is powered from an external supply or from the MIO-16E board. Furthermore, two jumpers control how the board is shielded and grounded. Additionally, there are eight sets of switches and jum[...]

  • Page 18

    Configuration and Installation Chapter 2 SC -2040 User Manu al 2- 4 © National Instruments Corporation Table 2-2. Shield Selection Jumper Description Configuration W1 SHLD OFF position—Place the jumper in this position to keep the SC-2040 analog ground isolated from the metal standoffs in the corners of the board (factory setting). W1 SHLD OFF S[...]

  • Page 19

    Chapter 2 Configuration and Installation © National Instruments Corporation 2- 5 SC-2040 User Manual Table 2-4. Channel Gain Selection Switch Description Configuration U2 U6 U9 U14 U17 U21 U24 U28 Gain T able Unity gain position—For unity gain (gain = 1), open all the switches by pushing down the OFF end of the switches. (factory setting) OFF 12[...]

  • Page 20

    Configuration and Installation Chapter 2 SC -2040 User Manu al 2- 6 © National Instruments Corporation Supplementary Configuration Information Power Supply Selection Set switch SW1 to the INT position to connect the SC-2040 power converter to the +5 V lines on the MIO-16E board. Set switch SW1 to the EXT position to draw power from an external +5 [...]

  • Page 21

    Chapter 2 Configuration and Installation © National Instruments Corporation 2- 7 SC-2040 User Manual To close a switch, push down the number side. Closing switch A selects a gain of 500. Closing switch B selects a gain of 200. Closing switch C selects a gain of 100. Closing switch D selects a gain of 10. Opening all the switches selects a gain of [...]

  • Page 22

    Configuration and Installation Chapter 2 SC -2040 User Manu al 2- 8 © National Instruments Corporation Installation Note: You must turn off power to the PC, and to the SC-2040 board if the board is externally powered, before installing the board or making any connections to it. To install the SC-2040, connect the 68-pin ribbon from the MIO -16E I/[...]

  • Page 23

    © National Instruments Corporation 3-1 SC-2040 User Manual Chapter 3 Signal Connections This chapter describes the signal connections to the SC-2040 board, and cable wiring. I/O Connector Pin Description Warning: Connections that exceed any of the maximum ratings of input or output signals on the MIO-16 can result in damage to the MIO-16 board and[...]

  • Page 24

    Signal Connections Chapter 3 SC-2040 User Manual 3- 2 © National Instruments Corporation 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 A. Breakout Connector J1 1 B. I/O Connector J12 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11[...]

  • Page 25

    Chapter 3 Signal Connections © National Instruments Corporation 3- 3 SC-2040 User Manual Table 3-1. Pin Assignments for Connectors J11 and J12 Breakout Connector J11 Pin Numbers SC-2040 Signal Names 1 MIO-16E Series Signal Names I/O Connector J12 Pin Numbers 1, 2 AIGND AIGND 24, 27, 29, 32, 56, 59, 64, 67 3 ACH0 ACH0 68 4 AIGND ACH8 34 5 ACH1 ACH1[...]

  • Page 26

    Signal Connections Chapter 3 SC-2040 User Manual 3- 4 © National Instruments Corporation Signal Connection Description Table 3-2. Input Connectors Signal Summary Connector Signal Name Description J5 AIGND Analog Input Ground—These inputs provide a bias current return point for AC-coupled signals. J1, J2, J3, J4, J6, J7, J8, J9 CH+<0..7> Po[...]

  • Page 27

    Chapter 3 Signal Connections © National Instruments Corporation 3- 5 SC-2040 User Manual Table 3-3. Output Connectors (J11 and J12) Signal Summary (Continued) J11 Pin (50-pin) J12 Pin (68-pin) Signal Name Description 46 38 TRACK*/HOLD (PFI7/STARTSCAN) Track-or-hold—This pin, used as an output from the MIO-16E, controls whether the SC-2040 is in [...]

  • Page 28

    Signal Connections Chapter 3 SC-2040 User Manual 3- 6 © National Instruments Corporation SC-2040 Input Signals AIGND CH0+ CH0- CH1+ CH1- . . . . . . CH7 CH7 TRIG DGND SC-2040 Screw T erminals Signals Sent to MIO-16 AIGND AISENSE ACH1 . . . . . . . . ACH7 PFI2/ ST ARTSCAN PFI7 DGND J1 1 and J12 Connectors on SC-2040 ACH0 T/H T/H T/H J5 J1 J2 J9 J10[...]

  • Page 29

    Chapter 3 Signal Connections © National Instruments Corporation 3- 7 SC-2040 User Manual Analog Signal Inputs Connect the differential signals to be measured to the screw terminal connectors J1 through J4 and J5 through J9. DC-Coupled Inputs Note: If all your inputs are DC-coupled, leave connector J5 disconnected. All eight channels have fully dif[...]

  • Page 30

    Signal Connections Chapter 3 SC-2040 User Manual 3- 8 © National Instruments Corporation Figure 3-4 illustrates how to connect a floating signal. IN- IN+ SC-2040 V in CH+ CH- A 100 k Ω A B C Figure 3-4. Floating Signal Connection AC-Coupled Signals Note: For AC-coupled signals, you must reference the analog ground of your instrumentation to the [...]

  • Page 31

    Chapter 3 Signal Connections © National Instruments Corporation 3- 9 SC-2040 User Manual Figures 3-5 through 3-7 illustrate how to connect AC-coupled signals. IN- IN+ SC-2040 V in CH+ CH- A 100 k Ω A B C Figure 3-5. Ground-Referenced AC-Coupled Signal Connection IN- IN+ SC-2040 GND Analog V in CH+ CH- A 100 k Ω A B C A Figure 3-6. Ground-Offse[...]

  • Page 32

    Signal Connections Chapter 3 SC-2040 User Manual 3- 10 © National Instruments Corporation IN- IN+ 100 k Ω V in SC-2040 CH+ CH- A A B C Figure 3-7. Floating AC-Coupled Signal Connection Analog Input Ranges Warning: Exceeding the differential and common-mode input ranges results in distorted input signals. Exceeding the maximum input voltage ratin[...]

  • Page 33

    Chapter 3 Signal Connections © National Instruments Corporation 3- 11 SC-2040 User Manual where V + i n is the signal at the positive input (IN0+ through IN7+), and V - i n is the signal at the corresponding negative input (IN0- through IN7-). Both V + i n and V - i n are measured with respect to the SC -2040 chassis ground. Digital Signal Inputs [...]

  • Page 34

    © National Instruments Corporation 4- 1 SC-2040 User Manual Chapter 4 Theory of Operation This chapter contains a functional overview of the SC-2040 board and explains the operation of each functional unit making up the SC-2040. Functional Overview The SC-2040 consists of eight channels, each one comprising an instrumentation amplifier with DIP sw[...]

  • Page 35

    Theory of Operation Chapter 4 SC-2040 User Manual 4- 2 © National Instruments Corporation T/H T/H Input Protection Input Protection + - Inst. Amp + - Inst. Amp Gains Gains • • • • • • • • • • • • • • A A 68-Pin I/O Connector 50-Pin Breakout Connector ACH0 ACH7 PFI7 PFI2 (T rack/Hold Signal) +5 V +15 V -15 V Power-On LED[...]

  • Page 36

    Chapter 4 Theory of Operation © National Instruments Corporation 4- 3 SC-2040 User Manual Analog Circuitry The analog input circuitry consists of eight channels with DIP-switch-programmable instrumentation amplifiers followed by buffered track-and-hold amplifiers. In addition, you can include the voltage-regulation circuitry and input protection i[...]

  • Page 37

    Theory of Operation Chapter 4 SC-2040 User Manual 4- 4 © National Instruments Corporation find the inputs again after having been in hold mode. Therefore, this delay indicates how long the SC-2040 must remain in track mode before it is ready to re-enter hold mode. Returning the SC -2040 to hold mode before the track-mode acquisition delay has elap[...]

  • Page 38

    Chapter 4 Theory of Operation © National Instruments Corporation 4- 5 SC-2040 User Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Differential Channel Input PFI7 (track*/hold) SC-2040 Channel Output hold hold track t DAQ Conversion t DAQ Conversion (DAQ board is scanning) [...]

  • Page 39

    Theory of Operation Chapter 4 SC-2040 User Manual 4- 6 © National Instruments Corporation t DAQ Conversion t DAQ Conversion . . . . . hold hold track track Differential Channel Input PFI2 (external trigger) PFI7 (track*/hold) SC-2040 Channel Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [...]

  • Page 40

    © National Instruments Corporation 5- 1 SC -2040 User Manual Chapter 5 Calibration Procedures This chapter discusses the calibration procedures for the SC-2040 board. Note: In many applications, the SC -2040 factory-hardware calibration is sufficient to meet accuracy requirements, and no further calibration, either hardware or software, is needed.[...]

  • Page 41

    Calibration Procedures Chapter 5 SC-2040 User Manual 5- 2 © National Instruments Corporation Gain Adjustment Gain adjustment requires you to apply two different input signals. One of the two points is typically zero, because zero is easy to generate with a high degree of accuracy. The other should be near full scale, either a DC-voltage from a pre[...]

  • Page 42

    Chapter 5 Calibration Procedures © National Instruments Corporation 5- 3 SC-2040 User Manual Your accuracy needs determine how carefully the offsets need to be calibrated. A typical requirement might be for total offset referred to output to be less than half of an LSB of the DAQ board being used. For example, a 12-bit, 20 V system has a resolutio[...]

  • Page 43

    Calibration Procedures Chapter 5 SC-2040 User Manual 5- 4 © National Instruments Corporation 4. Set the DAQ board to a high gain and measure its offset by shorting its input. You must subtract this measured offset from all subsequent board measurements to ensure accuracy. For the offset of the DAQ board not to affect the calibration, you must subt[...]

  • Page 44

    © National Instruments Corporation A- 1 SC-2040 User Manual Appendix A Specifications This appendix lists the specifications for the SC-2040. These are typical at 25 ° C unless otherwise stated. The operating temperature range is 0 ° to 50 ° C. Analog Input Input Characteristics Number of channels 8 d ifferential Input signal ranges Board Gain [...]

  • Page 45

    Specifications Appendix A SC-2040 User Manual A- 2 © National Instruments Corporation Amplifier Characteristics Input impedance Normal powered on 100 G Ω in parallel with 20 pF Input bias current ± 100 pA, ± 10 mA max Input offset current ± 10 pA CMRR Gain dB (min and typ) Gain = 1 70 dB min, 90 dB typ Gain = 10 87 dB min, 104 dB typ Gain ≥[...]

  • Page 46

    Appendix A Specifications © National Instruments Corporation A- 3 SC-2040 User Manual S/H Characteristics Measurement 0.012% 0.003% 0.0015% 0.00076% Track mode acquisition time 7 µ s 10 µ s 50 µ s 1 ms Hold mode settling time 1 µ s1 µ s1 µ s2 µ s Hold step -5 mV — — — Droop rate ± 10 mV/s — — — Aperture time 250 ns — — — [...]

  • Page 47

    © National Instruments Corporation B- 1 SC-2040 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 documentation. Filling out a copy of the Technical S[...]

  • Page 48

    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 contacting National Instruments for technical support helps our applications engineers answer your questions m[...]

  • Page 49

    SC-2040 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 configuration. Completing this form accurately before[...]

  • Page 50

    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: SC-2040 User Manual Edition Date: September 1994 Part Number: 3 71191 A-01 Please comment on the completeness, clarity, and organization of the manua[...]

  • Page 51

    © National Instruments Corporation Glossary- 1 SC-2040 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 Ω ohms A amperes ACH# DAQ board analog input channel number A/D analog-to-digital Arms amp[...]

  • Page 52

    Glossary SC-2040 User Manual Glossary-2 © National Instruments Corporation RAM random-access memory rms root mean square s seconds SPI serial peripheral interface tempco temperature coefficient T/H track-and-hold UL Underwriters Laboratory V volts VI virtual instrument V IH volts input high V IL volts input low V in volts in V OH volts output high[...]

  • Page 53

    © National Instruments Corporation Index- 1 SC-2040 User Manual Index Numbers/Symbols +5 V signal input connector summary (table), 3-4 output connector summary (table), 3-4 to 3-5 A AC-coupled inputs, 3-8 to 3-11 common-mode input range, 3-10 to 3-11 exceeding differential and common-mode ranges (warning), 3-10 floating AC-coupled signal connectio[...]

  • Page 54

    Index SC-2040 User Manual Index- 2 © National Instruments Corporation procedure for, 2-6 to 2-7 switch settings (table), 2-7 table, 2-5 channel input mode (table), 2-5 CH+(0..7) signal (table), 3-4 common-mode input range, 3-10 to 3-11 configuration channel gain selection gain switches for each channel (table), 2-6 procedure for, 2-6 to 2-7 switch[...]

  • Page 55

    Index © National Instruments Corporation Index- 3 SC-2040 User Manual unpacking the SC-2040, 1-4 instrumentation amplifiers, 4-3 INT switch position (table), 2-3 J J11 and J12 connectors. See connectors J11 and J12. jumpers and switches. See configuration. L LabVIEW and LabWindows application software, 1-2 M manual. See documentation. MIO-16E DAQ [...]

  • Page 56

    Index SC-2040 User Manual Index- 4 © National Instruments Corporation register-level programming, 1-4 specifications analog input amplifier characteristics, A-2 dynamic characteristics, A-2 input characteristics, A-1 S/H characteristics, A-3 stability, A-3 transfer characteristics, A-1 environment, A-3 physical, A-3 power requirements, A-3 T techn[...]