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National Instruments BNC-208X Series User Manual

Analog bnc breakout boards
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BNC-208X Series
User Manual
Analog BNC Breakout Boards
September 1993 Edition
Part Number 320407-01
© Copyright 1991, 1994 National Instruments Corporation.
All Rights Reserved.

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Summary of Contents for National Instruments BNC-208X Series

  • Page 1 BNC-208X Series User Manual Analog BNC Breakout Boards September 1993 Edition Part Number 320407-01 © Copyright 1991, 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,...

  • Page 3: Limited Warranty

    Any action against National Instruments must be brought within one year after the cause of action accrues. National Instruments shall not be liable for any delay in performance due to causes beyond its reasonable control. The warranty provided herein does not cover damages, defects, malfunctions, or service failures caused by owner’s failure to follow the National...
  • 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...
  • Page 5 The BNC-208X Series User Manual is organized as follows: • Chapter 1, Introduction, describes the BNC-208X Series boards; lists the contents of your BNC-2080 and BNC-2081 kits; describes the optional equipment, signal conditioning accessories, and software support; and explains how to unpack your BNC-208X Series board.
  • Page 6 The following acronyms are used in this manual: alternating current CMRR common-mode rejection ratio direct current DGND digital ground DIFF differential input input/output light-emitting diode NRSE nonreferenced single-ended input referenced single-ended input volts direct current BNC-208X Series User Manual © National Instruments Corporation...
  • Page 7 SC-206X Series User Manual (part number 320200-01) • SC-207X Series User Manual (part number 320239-01) The following National Instruments documents may also be helpful to you depending on the type of system you are using with your BNC-208X Series boards: •...

  • Page 8: Table Of Contents

    Building Highpass Filters...................2-17 Building Attenuators (Voltage Dividers)............2-20 PC-LPM-16....................2-22 MIO-16 Analog Output................2-23 Chapter 3 BNC-2081 Board ......................... 3-1 Analog Input ........................3-2 Shield Ground ........................3-4 Fuse and Power LED .....................3-5 Digital and Timing Signals ....................3-5 © National Instruments Corporation BNC-208X Series User Manual...
  • Page 9 Hardware Installation for the BNC-2080 and the BNC-2081......4-1 Installing the SC-205X Series Cable Adapter Boards ........4-2 Installing the SC-207X General-Purpose Termination Breadboards....4-2 Rack Mounting....................4-2 External Power Connection (If Necessary)............4-5 BNC-208X Series Board Connection ..............4-6 Signal Connections ......................4-7 Ribbon-Cable Connectors..................4-7 Rack-Mount Chassis Cover Attachment............4-7 Appendix Customer Communication ....................A-1...
  • Page 10 DAC0 OUT Schematic..................3-14 Figure 3-13. Analog Output Schematic for DACs, DAC0 OUT Shown ......3-14 Figure 4-1. Mounting Locations for the BNC-208X Series Board and SC-207X Series Board......................4-3 Figure 4-2. Mounting Locations for the BNC-208X Series Board and SC-205X Series Board or SC-206X Series Board............4-3 Figure 4-3.
  • Page 11 Contents Tables Table 1-1. Data Acquisition Boards for Use with BNC-208X Series Boards ....1-1 Table 2-1 Switch S5 Settings for National Instruments Data Acquisition Boards ...2-3 Table 2-2. DIFF Mode Channel Component Positions............2-5 Table 2-3. Data Acquisition Boards Used with the BNC-2080 Board ......2-7 Table 3-1.

  • Page 12: Chapter 1 Introduction

    Table 1-1 lists the specific data acquisition boards that can currently be used with the BNC-208X Series boards. Table 1-1. Data Acquisition Boards for Use with BNC-208X Series Boards...

  • Page 13: Figure 1-1. Bnc-2080 Board Directly Connected To An Mio-16 Board

    206X Series signal conditioning board, and an SC-207X Series general-purpose termination breadboard in a 19-in. rack-mount chassis. You can mount your BNC-208X Series board on the left or right side of the rack mount. Mounting the BNC-208X Series board on the left side and running the cable under the BNC-208X Series board to connect to the any of the SC Series boards will make access to both boards easier.

  • Page 14: What Your Kit Should Contain

    BNC-2081 board 181635-01 You can identify which version of the BNC-208X Series kit you have by looking up the part number in the preceding table. In addition to the board, each version of the BNC-208X Series kit contains the following component.

  • Page 15: Signal Conditioning Accessories

    776335-01 0.5 m cable 1.0 m cable 776335-11 SC-2052 and 50-conductor cable 0.5 m cable 776335-02 1.0 m cable 776335-12 SC-2053 and 50-conductor cable 776335-03 0.5 m cable 1.0 m cable 776335-13 BNC-208X Series User Manual © National Instruments Corporation...

  • Page 16: Software Support

    Unpacking Your BNC-208X Series board is shipped in an antistatic package to prevent electrostatic damage to the board. Several components on the board can be damaged by electrostatic discharge. To avoid such damage in handling the board, take the following precautions: •...

  • Page 17: Chapter 2 Bnc-2080 Board

    The BNC-2080 board is used with the National Instruments data acquisition boards for the Macintosh NuBus (NB Series), IBM PS/2 Micro Channel (MC Series), and PC/XT/AT and compatible computers.

  • Page 18: Figure 2-2. Bnc-2080 Board Parts Locator Diagram

    BNC-2080 Board Chapter 2 Figure 2-2 illustrates the parts locator diagram for the BNC-2080 board. Art not available in PDF version of this document. Figure 2-2. BNC-2080 Board Parts Locator Diagram BNC-208X Series User Manual © National Instruments Corporation...

  • Page 19: Power Connections

    I/O pins in position B, and to pins 49 (+5 V) and 50 (DGND) in position C. Table 2-1 shows the setting to be used with each of the National Instruments data acquisition boards. Table 2-1. Switch S5 Settings for National Instruments Data Acquisition Boards...

  • Page 20: Figure 2-3. Onboard Equivalent Circuit For Diff Mode

    Figure 2-3. Onboard Equivalent Circuit for DIFF Mode The components are numbered differently for each channel. Table 2-2 lists the components in each channel and their correspondence to the circuit shown in Figure 2-3. BNC-208X Series User Manual © National Instruments Corporation...

  • Page 21: Shield Ground

    BNC-2080 board is on metal standoffs and is mounted in a grounded metal case. Shield grounding can be selected to reduce noise. Figure 2-4 details the jumper settings for W2. Shield Ground Selected Shield Ground Not Selected Figure 2-4. W2 Jumper Settings © National Instruments Corporation BNC-208X Series User Manual...

  • Page 22: Fuse And Power Led

    For more information on the SC-205X Series boards, the SC-206X Series boards, or the SC- 207X Series boards, refer to either your National Instruments catalog, the SC-205X Series User Manual, the SC-206X Series User Manual, or the SC-207X Series User Manual.

  • Page 23: Power Requirements

    Table 2-3. Data Acquisition Boards Used with the BNC-2080 Board NB Series MC Series AT Series (Macintosh NuBus) (IBM PS/2) (PC AT) BNC-2080 NB-MIO-16 MC-MIO-16 AT-MIO-16 NB-MIO-16X AT-MIO-16D* AT-MIO-16F-5 AT-MIO-16X PC-LPM-16 *Requires an NB5 cable, available separately. © National Instruments Corporation BNC-208X Series User Manual...

  • Page 24: Figure 2-5. Direct Connection Between An Mio-16 Board And The Bnc-2080 Board

    Figure 2-5. Direct Connection between an MIO-16 Board and the BNC-2080 Board If any signal conditioning of the digital I/O ports with the National Instruments SC-206X Series boards is desired, then the SC-2050 cable adapter board must be used with the data acquisition boards listed in Table 2-2.

  • Page 25: Mounting

    BNC connectors to DIFF. This must be done to all eight switches in order to have eight differential channels. In DIFF mode, the first eight © National Instruments Corporation BNC-208X Series User Manual...

  • Page 26: Figure 2-7. Switch Configurations For Differential Mode Or Single-Ended Mode

    NRSE Figure 2-8. W1 Ground Reference Jumper The three configurations of the BNC-2080 board corresponding to the input mode configuration of the MIO-16 are shown in Figure 2-9 and Figure 2-10. BNC-208X Series User Manual 2-10 © National Instruments Corporation...

  • Page 27: Figure 2-9. Bnc-2080 Switch Configurations For An Mio-16 Configured In Diff Mode (Factory Default Setting)

    Chapter 2 BNC-2080 Board Art not available in PDF version of document. Figure 2-9. BNC-2080 Switch Configurations for an MIO-16 Configured in DIFF Mode (Factory Default Setting) © National Instruments Corporation 2-11 BNC-208X Series User Manual...

  • Page 28: Connecting Nonreferenced (Or Floating) Signal Sources

    Building Lowpass Filters, Building Highpass Filters, and Building Attenuators (Voltage Dividers) later in this chapter, can be built in the open component positions. BNC-208X Series User Manual 2-12 © National Instruments Corporation...

  • Page 29: Single-Ended Inputs

    AIGND. Signal conditioning circuitry such as filters and attenuators, as described in the sections titled Building Lowpass Filters, Building Highpass Filters, and Building Attenuators (Voltage Dividers) later in this chapter, can be built in the open component positions. © National Instruments Corporation 2-13 BNC-208X Series User Manual...

  • Page 30: Connecting Ground-Referenced Signal Sources

    (2πRC) The frequency response rolls off at a rate of -20 dB per decade of increase thereafter. A Bode plot of the amplitude versus normalized frequency is shown in Figure 2-12. BNC-208X Series User Manual 2-14 © National Instruments Corporation...
  • Page 31 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 (CMRR).

  • Page 32: Building Highpass Filters

    (Formula 2-2) (2πRC) The frequency response rolls off at a rate of -20 dB per decade decrease thereafter. A Bode plot of the amplitude versus normalized frequency is shown in Figure 2-14. BNC-208X Series User Manual 2-16 © National Instruments Corporation...

  • Page 33: Figure 2-14. Normalized Frequency Response Of Highpass Filter

    Note: Due to space constraints, when a resistor is inserted in position G (capacitor position) it must be inserted vertically before bending the other lead to the board. © National Instruments Corporation 2-17 BNC-208X Series User Manual...

  • Page 34: Figure 2-15. Highpass Filter On Differential Channel 1

    (Capacitor) Channel 1 (+in {Center}) BNC Connector C2 = 6.34 kΩ Input (Resistor) Multiplexer Channel 9 (-in {Case}) R20 = 0.001 µF (Capacitor) Figure 2-15. Highpass Filter on Differential Channel 1 BNC-208X Series User Manual 2-18 © National Instruments Corporation...

  • Page 35: Building Attenuators (Voltage Dividers)

    Input voltages greater than 42 V can result in damage to the BNC-2080 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 not liable for damage or injury resulting from such misuse.

  • Page 36: Figure 2-16. Attenuator For Use With Differential Inputs

    R3 = 10 kΩ Channel 1 (+in {Center}) BNC Connector C2 = 10 kΩ Input (Resistor) Multiplexer Channel 9 (-in {Case}) R20 = 10 kΩ Figure 2-16. Attenuator for Use with Differential Inputs BNC-208X Series User Manual 2-20 © National Instruments Corporation...

  • Page 37: Figure 2-17. Switch Configurations For Se Mode (Pc-Lpm-16)

    When the MIO-16 is configured for ±10-V inputs, the board can acquire ±30-V signals with this attenuator circuit. If the use of thermocouples is required in your applications, using National Instruments SC-2070 board is better suited for the task. The SC-2070 board is equipped with an onboard temperature sensor for use with thermocouple cold-junction compensation.

  • Page 38: Pc-Lpm-16

    DAC0 OUT DAC0 OUT BNC Connector Jumpers Installed Here at Factory AOGND Figure 2-19. Analog Output Schematic for DACs, DAC0 OUT Shown BNC-208X Series User Manual 2-22 © National Instruments Corporation...

  • Page 39: Chapter 3 Bnc-2081 Board

    I/O ports. This connector is in the standard pinout for connection to one of National Instruments DIO-24 boards. The BNC-2081 board is used with the National Instruments Lab data acquisition boards for the Macintosh (Lab-NB and Lab-LC), IBM PC/XT/AT, and compatible computers (Lab-PC and Lab-PC+).

  • Page 40: Analog Input

    The board is shipped with wire jumpers in one position for each input. The equivalent circuit of one input is shown in Figure 3-3. For specific applications illustrating signal conditioning with single-ended inputs, refer to Application Notes later in this chapter. BNC-208X Series User Manual © National Instruments Corporation...

  • Page 41: Figure 3-3. Onboard Equivalent Circuit

    Figure 3-3. Onboard Equivalent Circuit The components are numbered differently for each channel. Table 3-1 is a listing of the components in each channel and their correspondence to the circuit shown in Figure 3-3. © National Instruments Corporation BNC-208X Series User Manual...

  • Page 42: Shield Ground

    BNC-2081 board is on metal standoffs and mounted in a grounded metal case. Shield grounding can be selected to reduce noise. Figure 3-4 shows the jumper settings for W1. Shield Ground Selected Shield Ground Not Selected Figure 3-4. W1 Jumper Settings BNC-208X Series User Manual © National Instruments Corporation...

  • Page 43: Fuse And Power Led

    Lab board user manual for information on the use of these signals. If you want screw terminal access to all signals, a National Instruments SC-2071 board can be used in conjunction with the BNC-2081 board. If you want optical isolation of or relay control by the digital I/O lines, you must use a National Instruments SC-2053 cable adapter board and the appropriate SC-206X Series digital signal conditioning board.

  • Page 44: Physical

    The BNC-2081 board directly connects to the Lab-PC, Lab-PC+ and Lab-NB using the 50-pin NB1 cable supplied with the BNC-2081. The Lab-LC board connects to the BNC-2081 using an NB10 cable, available separately. BNC-208X Series User Manual © National Instruments Corporation...

  • Page 45: Figure 3-5. Direct Connection Between A Lab Board And The Bnc-2081 Board

    SC-206X Series Board, via the SC-2053 Board Warning: Do not connect the BNC-2081 board to any board other than a National Instruments Lab data acquisition board, the SC-2053 cable adapter board, or the SC-2071 board. The BNC- 2081 board is not compatible with any other data acquisition boards or cable adapter boards.

  • Page 46: Mounting

    C (see Table 3-1). Signal conditioning circuitry, such as the filters and attenuators described in Building Lowpass Filters, Building Highpass Filters, and Building Attenuators (Voltage Dividers) later in this chapter, can be used. Connecting Ground-Referenced Signal Sources BNC-208X Series User Manual © National Instruments Corporation...

  • Page 47: Building Lowpass Filters

    The frequency response rolls off at a rate of -20 dB per decade of increase thereafter. A Bode plot of the amplitude versus normalized frequency is shown in Figure 3-7. Amplitude 0.01 0.001 0.0001 1,000 10,000 (f ) Normalized Frequency Figure 3-7. Normalized Frequency Response of Lowpass Filter © National Instruments Corporation BNC-208X Series User Manual...

  • Page 48: Figure 3-8. Lowpass Filter On Channel 1

    1-µF Capacitor Input Schematic for ACH1 R6 = 39 kΩ Channel 1 (Center) BNC Connector R14 = 1 µF Input (Capacitor) Multiplexer AIGND (Case) AIGND Figure 3-8. Lowpass Filter on Channel 1 BNC-208X Series User Manual 3-10 © National Instruments Corporation...

  • Page 49: Building Highpass Filters

    Resistor tolerance is not a concern in this application because most capacitors have poor tolerances (for example, 20% to 30%). Figure 3-10 illustrates both the schematic and the component placement for a 20-kHz highpass filter placed on input Channel 1. © National Instruments Corporation 3-11 BNC-208X Series User Manual...

  • Page 50: Building Attenuators (Voltage Dividers)

    Input voltages greater than 42 V can result in damage to the BNC-2081 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 not liable for damage or injury resulting from such misuse.

  • Page 51: Figure 3-11. Attenuator For Use With Bnc-2081 Board Inputs

    BNC Connector 10-kΩ Resistor Input Schematic for ACH1 Channel 1 (Center) BNC Connector R14 = 10 kΩ Input Multiplexer AIGND (Case) AIGND Figure 3-11. Attenuator for Use with BNC-2081 Board Inputs © National Instruments Corporation 3-13 BNC-208X Series User Manual...

  • Page 52: Lab Board Analog Output

    Figure 3-12 shows the DAC0 OUT schematic. Figure 3-13 shows the analog output schematic for DACs with DAC0 OUT shown. DAC0 OUT DAC0 OUT BNC Connector Jumpers Installed Here at Factory AOGND Figure 3-12. DAC0 OUT Schematic BNC-208X Series User Manual 3-14 © National Instruments Corporation...

  • Page 53: Figure 3-13. Analog Output Schematic For Dacs, Dac0 Out Shown

    AOGND Figure 3-13. Analog Output Schematic for DACs, DAC0 OUT Shown Additional Signal Connection Information For more information about signal connection, refer to Chapter 2 of your Lab board user manual. © National Instruments Corporation 3-15 BNC-208X Series User Manual...

  • Page 54: Installation And Connections

    This chapter explains how to install and make connections to the BNC-208X Series boards. Hardware Installation Most of the sections that follow apply to all the BNC-208X Series boards. However, several topics are more board-specific than others. Unless a given topic is delineated by board, the topic applies to all BNC-208X Series boards.

  • Page 55: Installing The Sc-205X Series Cable Adapter Boards

    BNC-208X Series board on the left or right side of the 19-in. rack mount. Mounting the BNC-208X Series board on the left side of the rack and any other of the SC Series boards on the right side of the rack will make access to both boards easier.

  • Page 56: Figure 4-1. Mounting Locations For The Bnc-208X Series Board And Sc-207X Series Board

    SC-205X Series Board BNC-208X Series Board SC-206X Series Board Left-Hand Right-Hand Mounting Mounting Position Position Figure 4-2. Mounting Locations for the BNC-208X Series Board and SC-205X Series Board or SC- 206X Series Board © National Instruments Corporation BNC-208X Series User Manual...

  • Page 57: Figure 4-3. Attaching A Mountable Board To The Chassis

    Installation and Connections Chapter 4 Mount the BNC-208X Series board in the chassis by removing the screws on the bottoms of the four standoffs attached to the board and using the same screws to attach the board to the mounting rack. The two standoffs in the center of the board are for support only and have no screws to attach the board to the rack as shown in Figure 4-3.

  • Page 58: External Power Connection (If Necessary)

    SC-206X Series digital signal conditioning boards, such as the SC-2062 board, are being used on the same data acquisition board as the BNC-208X Series board, some of these boards need to be powered by an external +5-VDC supply. Because the SC-206X Series boards draw much more current...

  • Page 59: Bnc-208X Series Board Connection

    Port -B- SC-206X Lab Board BNC-2081 SC-2053 Series SC-206X Series Digital I/O Figure 4-5. Connections between Data Acquisition Boards and BNC-208X Series Boards and between SC-205X Series Boards and BNC-2080 and BNC-2081 Boards BNC-208X Series User Manual © National Instruments Corporation...

  • Page 60: Signal Connections

    Chapter 4 Installation and Connections A 50-pin ribbon cable connects your BNC-208X Series board to either an SC-205X Series board, an SC-207X Series board, or directly to the data acquisition board. Remember to turn the host computer off before making any connections. One end of the ribbon cable connects to the BNC-208X Series board at connector J1 or J2.

  • Page 61: Appendix

    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 62 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 63 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: BNC-208X Series User Manual Edition Date: September 1993 Part Number: 320407-01 Please comment on the completeness, clarity, and organization of the manual.

  • Page 64: Index

    3-2 BNC-208X board connection, 4-6 connected to MIO-16, 1-2 contents of kit, 1-3 unpacking, 1-5 board dimensions BNC-2080, 2-7 BNC-2081, 3-6 cable adapter boards, installing, 4-2 cabling, board-to-board © National Instruments Corporation Index-1 BNC-208X Series User Manual...
  • Page 65 BNC-2081, 3-5 DIO connector, 3-5 double-height mounting, 4-5 external power connection, 4-5 field connections BNC-2080, 2-6 BNC-2081, 3-5 filters. See also highpass filters.; lowpass filters. highpass BNC-2080, 2-17 BNC-2081, 3-11 lowpass BNC-208X Series User Manual Index-2 © National Instruments Corporation...
  • Page 66 BNC-2080, 2-18 BNC-2081, 3-11 I/O connectors, 2-7 installation, 4-1 lowpass filters building BNC-2080, 2-15 BNC-2081, 3-9 normalized frequency response, 2-16, 3-9 on channel 1, 3-10 on differential channel 1, 2-17 © National Instruments Corporation Index-3 BNC-208X Series User Manual...
  • Page 67 PC-LPM-16, 2-1, 2-22 switch configurations, 2-22 physical specifications BNC-2080, 2-7 power and fuse LED BNC-2080, 2-6 BNC-2081, 3-5 power connections, 2-3 power consumption, 2-7 BNC-2081, 3-5 power requirements, 2-7 BNC-2081, 3-5 BNC-208X Series User Manual Index-4 © National Instruments Corporation...
  • Page 68 (BNC-2080), 3-8 nonreferenced BNC-2080, 2-13 BNC-2081, 3-8 single-ended inputs, 2-14, 2-15 mode switch configurations, 2-10 soldering BNC-2080, 2-9 BNC-2081, 3-8 specifications BNC-2080, 2-6 BNC-2081, 3-5 storage environment BNC-2080, 2-7 BNC-2081, 3-6 © National Instruments Corporation Index-5 BNC-208X Series User Manual...
  • Page 69 2-3 timing and digital signals, 3-5 unpacking BNC-208X, 1-5 VDC, vii voltage dividers. See attenuators. W1 ground reference jumper, 2-10 W1 jumper settings, 3-4 W2 jumper settings, 2-5 BNC-208X Series User Manual Index-6 © National Instruments Corporation...

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