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© 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.
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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.
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.
© National Instruments Corporation v SC-2040 User Manual Contents About This Manual ................................................................................................................ ix Organization of This Manual ......................
Contents SC-2040 User Manual v i © National Instruments Corporation Chapter 4 Theory of Operation .......................................................................................................... 4-1 Functional Overview .....................
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.
© 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.
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.
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.
© 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.
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.
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.
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.
© 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.
Configuration and Installation Chapter 2 SC -2040 User Manu al 2- 2 © National Instruments Corporation Figure 2-1. SC-2040 Parts Locator Diagram.
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.
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).
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.
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.
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.
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.
© 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.
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.
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 .
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.
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.
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 .
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.
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.
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.
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.
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.
© 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.
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.
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.
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.
Chapter 4 Theory of Operation © National Instruments Corporation 4- 5 SC-2040 User Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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 .
© 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.
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.
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.
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.
© 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.
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 .
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.
© 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.
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.
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.
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.
© National Instruments Corporation Glossary- 1 SC-2040 User Manual Glossary ___________________________________________________ Prefix Meaning Value p- pico- 10 - 12 n- nano- 10 - 9 µ - micro- 10 - .
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 t.
© 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.
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.
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.
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 cha.
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