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National Instruments BNC-208 Series User Manual

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  • Page 1 BNC-2080...
  • Page 2 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 3 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 4 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 5 Any use or application of National Instruments products for or involving medical or clinical treatment must be performed by properly trained and qualified...
  • Page 6 BNC-2081 boards and contains information about installing and making connections to the boards. The BNC-208X Series boards are analog breakout boards with BNC-style connectors. These breakout boards connect to the National Instruments multifunction data acquisition boards for the IBM PC/XT/AT, Personal System/2, and compatible computers, and Macintosh NuBus computers.
  • Page 7 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 8 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 9: 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 10 Figure 2-2. BNC-2080 Board Parts Locator Diagram............2-2 Figure 2-3. Onboard Equivalent Circuit for DIFF Mode ............2-4 Figure 2-4. W2 Jumper Settings..................2-5 Figure 2-5. Direct Connection between an MIO-16 Board and the BNC-2080 Board..2-8 BNC-208X Series User Manual © National Instruments Corporation...
  • Page 11 Attaching a Mountable Board to the Chassis ...........4-4 Figure 4-4. Double-Height Mounting..................4-5 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..................4-6 © National Instruments Corporation BNC-208X Series User Manual...
  • Page 12 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 13: Chapter 1 Introduction

    NB10 cable. If any SC-206X Series digital signal conditioning boards are also being used with the same data acquisition board for conditioning of the digital I/O signals, then an SC-205X Series cable adapter board is required. © National Instruments Corporation BNC-208X Series User Manual...

  • Page 15: What Your Kit Should Contain

    0.5 m 181304-05 1.0 m 181305-05 Rack-mount chassis kit with acrylic plastic cover Single height 180636-01 Double height 180636-02 Rack-mount chassis kit with metal wraparound cover Single height 181080-01 Double height 181080-02 © National Instruments Corporation BNC-208X Series User Manual...

  • Page 16: Signal Conditioning Accessories

    0.5 m cable 776335-01 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 0.5 m cable 776335-03 1.0 m cable 776335-13 BNC-208X Series User Manual © National Instruments Corporation...

  • Page 17: Software Support

    • Remove the board from the package and inspect the board for loose components or any other sign of damage. Notify National Instruments if the board appears damaged in any way. Do not install a damaged board into your computer.

  • Page 19: 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. Figure 2-2. BNC-2080 Board Parts Locator Diagram BNC-208X Series User Manual © National Instruments Corporation...

  • Page 20: Bnc-2080 Board

    BNC-2080 to connect to pins 33 (DGND) and 34 (+5 V) in position A, to no 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.

  • Page 21: 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 22: 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 23: Fuse And Power Led

    Solder holes for remaining MIO-16 signals Note: The DAC0 OUT and DAC1 OUT BNC connectors are for use with only the MIO-16 boards. These connectors are connected to ±12 VDC when the LPM-16 board is in use. BNC-208X Series User Manual © National Instruments Corporation...

  • Page 24: 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) NB-MIO-16 MC-MIO-16 AT-MIO-16 BNC-2080 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 25: 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 26: Mounting

    This must be done to all eight switches in order to have eight differential channels. In DIFF mode, the first eight analog (ACH0 through ACH7) BNC connectors are used. The remaining eight © National Instruments Corporation BNC-208X Series User Manual...
  • Page 27 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 28 Chapter 2 BNC-2080 Board 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 30: Connecting Nonreferenced (Or Floating) Signal Sources

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

  • Page 31: Single-Ended Inputs

    Building Lowpass Filters, Filters, and later in this chapter, can be Building Highpass Building Attenuators (Voltage Dividers) built in the open component positions. BNC-208X Series User Manual 2-14 © National Instruments Corporation...

  • Page 32: Connecting Ground-Referenced Signal Sources

    (2/RC) 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. © National Instruments Corporation 2-15 BNC-208X Series User Manual...
  • Page 33 E and F. The closest standard 5% tolerance resistors are 20 k1. The closest standard 0.5% resistors are 19.8 k1. 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 34: Building Highpass Filters

    (Formula 2-2) (2/RC) 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. © National Instruments Corporation 2-17 BNC-208X Series User Manual...
  • Page 35 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. BNC-208X Series User Manual 2-18 © National Instruments Corporation...
  • Page 36 (Capacitor) Channel 1 (+in {Center}) BNC Connector C2 = 6.34 k1 Input (Resistor) Multiplexer Channel 9 (-in {Case}) R20 = 0.001 µF (Capacitor) Figure 2-15. Highpass Filter on Differential Channel 1 © National Instruments Corporation 2-19 BNC-208X Series User Manual...

  • Page 37: Building Attenuators (Voltage Dividers)

    Due to space constraints, when a resistor is to be inserted in position G (capacitor Note: position) it must be inserted vertically before bending the other lead to the board. BNC-208X Series User Manual 2-20 © National Instruments Corporation...
  • Page 38 R3 = 10 k1 Channel 1 (+in {Center}) BNC Connector C2 = 10 k1 Input (Resistor) Multiplexer Channel 9 (-in {Case}) R20 = 10 k1 Figure 2-16. Attenuator for Use with Differential Inputs © National Instruments Corporation 2-21 BNC-208X Series User Manual...
  • Page 39 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 40: 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 © National Instruments Corporation 2-23 BNC-208X Series User Manual...
  • Page 42 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 later in this chapter. Application Notes BNC-208X Series User Manual © National Instruments Corporation...

  • Page 43: Bnc-2081 Board

    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 44: 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 45: 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 46: 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 47 Connection between a Lab Board, the BNC-2081, and the SC-206X Series Board, via the SC-2053 Board Do not connect the BNC-2081 board to any board other than a National Instruments Lab Warning: 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 48: Mounting

    C (see Table 3-1). Signal conditioning circuitry, such as the filters and attenuators described in Filters, and Building Lowpass Filters, Building Highpass 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 49: 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 50 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 51: 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 52: 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 53 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 54: 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 55 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 56: Installation And Connections

    Connect the BNC-208X Series board to the data acquisition board.) Connect field signals to the BNC-208X Series board at the BNC connectors or solder holes in the board for remaining digital signals. © National Instruments Corporation BNC-208X Series User Manual...

  • Page 57: Installing The Sc-205X Series Cable Adapter Boards

    Series board, can result in damage to the BNC-208X Series board, the data acquisition boards, or the host computer. High voltage can also cause an electric shock hazard to you. National Instruments is not liable for damages or injuries resulting from these connections. Installing the SC-205X Series Cable Adapter Boards Consult the SC-205X Series User Manual for instructions on the installation of your SC-205X Series board if any of these boards are being used.
  • Page 58 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 59 You need a hardware kit for double-height mounting consisting of two brackets that are installed in the rack mount. A second row of boards can be mounted on these brackets in the same way as the first row. BNC-208X Series User Manual © National Instruments Corporation...

  • Page 60: External Power Connection (If Necessary)

    If an external power supply is needed for the SC-206X or SC-207X Series boards, see the External Power Connection section of the SC-206X Series User Manual and the SC-207X Series User Manual. © National Instruments Corporation BNC-208X Series User Manual...

  • Page 61: 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 62: Signal Connections

    42-V peak cannot be applied to the SC-207X Series inputs. The SC-206X Series boards must be completely enclosed if any onboard voltages or any Warning: voltages connected to the relays can exceed 42 V. © National Instruments Corporation BNC-208X Series User Manual...

  • Page 63: Appendix

    Technical Support Form 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. (central time). In other countries, contact the nearest branch office. You may fax questions to us at any time.
  • Page 64 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 65 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 66: 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 67 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 68 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 69 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 70 (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 71 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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