Related Manuals for National Instruments SC-2040
Summary of Contents for National Instruments SC-2040
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Page 1: User Manual
SC-2040 User Manual Eight-Channel Simultaneous Sample-and-Hold Accessory September 1994 Edition Part Number 371191A-01 © Copyright 1994 National Instruments Corporation. All Rights Reserved. - 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 2321, France (1) 48 14 24 24, Germany 089/741 31 30, Italy 02/48301892, Japan (03) 3788-1921, Netherlands 03480-33466, Norway 32-848400, Spain (91) 640 0085, Sweden 08-730 49 70, Switzerland 056/20 51 51, U.K.
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Page 3: Limited Warranty
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 labor. - Page 4 Any use or application of National Instruments products for or involving medical or clinical treatment must be performed by properly trained and qualified medical personnel, and all traditional medical safeguards, equipment, and procedures that are appropriate in the particular situation to prevent serious injury or death should always continue to be used when National Instruments products are being used.
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Page 5: Table Of Contents
Contents About This Manual ...ix Organization of This Manual ...ix Conventions Used in This Manual...x The National Instruments Documentation Set...x Related Documentation ...xi Customer Communication ...xi Chapter 1 Introduction ... 1-1 About the SC-2040...1-1 What You Need to Get Started ...1-1 Software Programming Choices ...1-2... - Page 6 Chapter 5 Calibration Procedures ...5-1 Software Calibration ...5-1 Offset Adjustment...5-1 Gain Adjustment ...5-2 Linearity Adjustment ...5-2 Hardware Calibration...5-2 Appendix A Specifications ... A-1 Appendix B Customer Communication Glossary ...Glossary-1 Index ...Index-1 SC-2040 User Manual ... B-1 © National Instruments Corporation...
- Page 7 The Relationship between the Programming Environment, NI-DAQ, and Your Hardware... 1-3 Figure 2-1. SC-2040 Parts Locator Diagram...2-2 Figure 3-1. SC-2040 I/O Connectors J11 and J12...3-2 Figure 3-2. SC-2040 Signal Routing...3-6 Figure 3-3. Ground-Referenced Signal Connection...3-7 Figure 3-4. Floating Signal Connection ...3-8 Figure 3-5.
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Page 8: About This Manual
Organization of This Manual The SC-2040 User Manual is organized as follows: • Chapter 1, Introduction, 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. -
Page 9: Conventions Used In This Manual
Glossary. The National Instruments Documentation Set The SC-2040 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. Use the manuals you have as follows: •... -
Page 10: Related Documentation
Your DAQ hardware user 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 11: Chapter 1 Introduction
AT versions of that board. The SC-2040 is a circuitboard assembly that is placed on a workbench or mounted in a 19-in. rack. You can configure the SC-2040 to draw power from the MIO-16E board or from an external +5 V supply. -
Page 12: Software Programming Choices
Introduction Chapter 1 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-2040 works with LabVIEW for Windows, LabVIEW for Macintosh, LabWindows for DOS, LabWindows/CVI for Windows, NI-DAQ software for PC compatibles, and NI-DAQ software for Macintosh. -
Page 13: 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, EISA, 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 Professional BASIC, Turbo Pascal, Turbo C, Turbo C++, Borland C++, and Microsoft C for DOS;... -
Page 14: Register-Level Programming
Single or double height rack-mount kit with metal wraparound cover Unpacking Your SC-2040 board is shipped in an antistatic package to prevent electrostatic damage to the board. Electrostatic discharge can damage several components on the board. To avoid such damage in handling the board, take the following precautions: •... -
Page 15: Configuration And Installation
SC-2040 configuration. Board Configuration The SC-2040 has 10 jumpers, eight DIP switches, and one slide switch that you use to configure the board. These switches and jumpers are shown in Figure 2-1. © National Instruments Corporation... -
Page 16: Figure 2-1. Sc-2040 Parts Locator Diagram
Configuration and Installation Chapter 2 Figure 2-1. SC-2040 Parts Locator Diagram SC-2040 User Manual © National Instruments Corporation... -
Page 17: Table 2-1. Power Supply Selection
Chapter 2 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 jumpers that configure the gain settings and input modes of the eight SC-2040 channels. -
Page 18: Table 2-2. Shield Selection
SC-2040. Description AIGND-AIGND position— Use this setting if you are using a MIO-16E DAQ board. Place the jumper in this position to keep the SC-2040 digital ground and analog grounds isolated (factory setting). AIGND-DGND position— Place the jumper in this... -
Page 19: Supplementary Configuration Information
B-C position—Use this setting for connecting floating (non- ground referenced) sources. A 100 k resistor is connected from the negative channel input to the SC-2040 analog ground. Configuration and Installation Configuration A B C D The unity gain position has the number side up. -
Page 20: Power Supply Selection
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 V power supply connected to J13. -
Page 21: Input Mode Selection
Table 2-7. Switch Settings for Gain Selection Input Mode Selection Jumpers W2 through W9 select the input mode for each channel on the SC-2040. Position A-B leaves the negative input of the instrumentation amplifier connected only to the front connector. -
Page 22: Installation
Chapter 2 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/O connector to connector J12 on the SC-2040. -
Page 23: Chapter 3 Signal Connections
Connector J12 carries the signals to and from the MIO-16E board. Use connector J11 to access these signals. You can use this connector to monitor these signals, using a National Instruments CB-50, for example, or you can use this connector to connect to other DAQ accessories. -
Page 24: Figure 3-1. Sc-2040 I/O Connectors J11 And J12
Figure 3-1. SC-2040 I/O Connectors J11 and J12 Table 3-1 lists the pin assignments for the breakout connector J11 and the I/O connector J12 on the SC-2040 and the corresponding and MIO-16E Series signal names. SC-2040 User Manual B. I/O Connector J12 ©... -
Page 25: Table 3-1. Pin Assignments For Connectors J11 And J12
Table 3-1. Pin Assignments for Connectors J11 and J12 Breakout Connector J11 Pin Numbers Signal Names 1, 2 24, 33 34, 35 TRACK*/HOLD 1 All signals labeled NC are unused by the SC-2040. © National Instruments Corporation SC-2040 MIO-16E Series Signal Names AIGND AIGND ACH0... -
Page 26: Signal Connection Description
+5 VDC Source—When external power is selected, this input provides DC power for the SC-2040 from an external +5 V. The SC-2040 fuses the input to 1 A of the +5 V supply. Signal Name... - Page 27 The signals from the SC-2040 screw terminal connectors are connected to the MIO-16E via J12 as shown in Figure 3-2. Observe that the PFI7/STARTSCAN signal returns from the MIO-16E as a level-sensitive track-and-hold signal to the SC-2040. Notice also that AISENSE is disconnected.
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Page 28: Figure 3-2. Sc-2040 Signal Routing
SC-2040 Input Signals AIGND CH0+ CH0- CH1+ CH1- TRIG DGND SC-2040 Screw Terminals SC-2040 User Manual Track*/Hold Figure 3-2. SC-2040 Signal Routing Chapter 3 Signals Sent to MIO-16 AIGND AISENSE ACH0 ACH1 ACH7 PFI2/ STARTSCAN PFI7 DGND J11 and J12 Connectors on SC-2040 ©... -
Page 29: Analog Signal Input
Figure 3-3 illustrates how to connect a ground-referenced signal. Figure 3-3. Ground-Referenced Signal Connection © National Instruments Corporation 100 k SC-2040 Signal Connections... -
Page 30: Ac-Coupled Signals
The inputs of the SC-2040 have a typical bias current of about 100 pA. When you use a 1 M resistor, the result is 100 V of offset, which is insignificant in most applications. -
Page 31: Figure 3-5. Ground-Referenced Ac-Coupled Signal Connection
Chapter 3 Figures 3-5 through 3-7 illustrate how to connect AC-coupled signals. Figure 3-5. Ground-Referenced AC-Coupled Signal Connection Figure 3-6. Ground-Offset AC-Coupled Signal Connection © National Instruments Corporation 100 k SC-2040 100 k SC-2040 Analog Signal Connections SC-2040 User Manual... -
Page 32: Analog Input Ranges
The common-mode input range of the SC-2040 instrumentation amplifiers is defined as the magnitude of the greatest common-mode signal that can be rejected. Thus the common-mode input range for the SC-2040 depends on the gain and size of the differential input signal: diff... -
Page 33: Digital Signal Input
MIO-16E supplies power, it provides this reference. If an external supply provides power, it provides this reference through connector J13. A rising edge on the trigger will place the SC-2040 into hold mode, and the SC-2040 will return to track mode when the MIO-16E indicates that the data acquisition is complete. -
Page 34: Chapter 4 Theory Of Operation
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 switch-programmable gains of 1, 10, 100, 200, 300, 500, 600, 700, or 800, and a track-and- hold amplifier. -
Page 35: Figure 4-1. Sc-2040 Block Diagram
Theory of Operation • • • • Input • Protection • Figure 4-1. SC-2040 Block Diagram SC-2040 User Manual 68-Pin I/O Connector 50-Pin Breakout Connector • • • • Input • • Protection • • Chapter 4 © National Instruments Corporation... -
Page 36: Analog Circuitry
Because all of the track-and-hold amplifiers in each SC-2040 board enter hold mode at the same time, they implement simultaneous sampling of all channels. Simultaneous sampling is useful for preserving phase relationships between channels. -
Page 37: Triggering From The Daq Board
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 elapsed will cause the SC-2040 to "hold"... -
Page 38: External Triggering
SC-2040 outputs. After the MIO-16E board has acquired data from all of the channels, it returns the SC-2040 to track mode. The external trigger signal is a digital input and must conform to digital logic levels. -
Page 39: Output Connection
Connections. Power Supply The SC-2040 contains an onboard power switch to either power the SC-2040 from the MIO-16E board or to draw power from an external +5 V supply. From the +5 V power, an onboard DC-to-DC converter generates a 15 V source, which is used to power the analog circuitry. A red LED indicates that the board is receiving power. -
Page 40: Calibration Procedures
You can perform software calibration fairly frequently, which helps reduce drift effects. Because board-introduced errors are minimal with the SC-2040, the use of software rather than hardware calibration does not significantly reduce dynamic range. The main drawback of software calibration is reduced throughput due to the increased processing time. -
Page 41: Gain Adjustment
(y x) Linearity Adjustment The SC-2040 seldom needs linearity adjustment because its linearity is quite good, especially at low gains. Linearity error is often caused by the nonlinearity of the DAQ board you use. If necessary, the method described previously for correcting gain and offset error may be extended to include linearity by taking more points along the transfer function and processing the subsequently acquired data according to a polynomial fit of the calibration points. -
Page 42: Table 5-1. Calibration Component Identification
The magnitude of the hold step on the SC-2040 is approximately 5 mV, enough to make it necessary to calibrate output offset in hold mode rather than track mode. You may calibrate input offset without switching the board to hold mode. - Page 43 If necessary, repeat steps 5 and 6 until the offset is calibrated at both gains. 8. Repeat steps 5 through 7 for the additional channels you want to calibrate. There is no calibration interdependence among the channels. 9. Replace the rack-mount chassis cover, if used. SC-2040 User Manual © National Instruments Corporation Chapter 5...
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Page 44: Appendix A Specifications
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 Input signal ranges Input coupling... - Page 45 Bandwidth System noise Noise spectral density Input noise (gain = 1) Output noise Slew rate SC-2040 User Manual 100 G in parallel with 20 pF 100 pA, 10 mA max 10 pA Gain dB (min and typ) Gain = 1...
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Page 46: Power Requirement
+5 VDC ( 10 %) Total power dissipation Physical Dimensions I/O connectors Input Output Environment Operating temperature Storage temperature Relative humidity © National Instruments Corporation Measurement 0.012% 0.003% Track mode 10 s acquisition time Hold mode settling time Hold step... -
Page 47: Customer Communication
Filling out a copy of the Technical Support Form before contacting National Instruments helps us help you better and faster. National Instruments provides comprehensive technical assistance around the world. In the U.S. and Canada, applications engineers are available Monday through Friday from 8:00 a.m. to 6:00 p.m. - Page 48 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 49 Completing this form accurately before contacting National Instruments for technical support helps our applications engineers answer your questions more efficiently.
- 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: 371191A-01 Please comment on the completeness, clarity, and organization of the manual.
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Page 51: Glossary
© National Instruments Corporation Meaning pico- nano- micro- milli- kilo- mega- Glossary-1 Value 10 - 10 -... - Page 52 Underwriters Laboratory volts virtual instrument volts input high volts input low volts in volts output high volts output low volts out volts alternating current volts direct current Vrms volts, root mean square SC-2040 User Manual Glossary-2 © National Instruments Corporation...
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Page 53: Index
(illustration), 3-8 ground-referenced signal connection (illustration), 3-7 leaving connector J5 disconnected (note), 3-7 block diagram of SC-2040, 4-2 board configuration. See configuration. calibration procedures hardware calibration, 5-2 to 5-4 calibration component identification (table), 5-3 steps for, 5-3 to 5-4... - Page 54 (illustration), 3-7 leaving connector J5 disconnected (note), 3-7 DGND signal input connector summary (table), 3-4 SC-2040 User Manual output connector summary (table), 3-4 to 3-5 digital signal inputs, 3-9 documentation conventions used in manual, x National Instruments documentation...
- Page 55 4-6 output connectors (J11 and J12) signal summary (table), 3-4 to 3-5 parts locator diagram, 2-2 physical specifications, A-3 pin assignments for SC-2040 I/O connectors J11 and J12 (table), 3-3 power-on sequence, 2-8 power supply description, 4-6 selecting...
- Page 56 TRIG (PF12) signal (table), 3-4 triggering from DAQ board, 4-4 to 4-5 external digital signal inputs, 3-11 illustration, 4-6 theory of operation, 4-5 to 4-6 unity gain position (table), 2-5 unpacking the SC-2040, 1-4 SC-2040 User Manual Index-4 © National Instruments Corporation...