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National Instruments BNC-208 Series, User Manual

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Chapter 3

BNC-2081 Board

© National Instruments Corporation

3-15

BNC-208X Series User Manual

BNC Connector

DAC0 OUT

AOGND

R9

C5

Jumpers Installed Here
at Factory

DAC0 OUT

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.

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Summary of Contents for BNC-208 Series

Page 1: ...BNC 2080...

Page 2: ...Copyright 1991 1994 National Instruments Corporation All Rights Reserved BNC 208X Series User Manual Analog BNC Breakout Boards September 1993 Edition Part Number 320407 01...

Page 3: ...ria 0662 435986 Belgium 02 757 00 20 Canada Ontario 519 622 9310 Canada Qu bec 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 0...

Page 4: ...event shall National Instruments be liable for any damages arising out of or related to this document or the information contained in it EXCEPT AS SPECIFIED HEREIN NATIONAL INSTRUMENTS MAKES NO WARRA...

Page 5: ...or application designer 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 an...

Page 6: ...080 board in detail including its function specifications compatibility connection mounting and application notes Chapter 3 BNC 2081 Board describes the BNC 2081 board in detail including its function...

Page 7: ...ions for units of measure in this manual Prefix Meaning Value micro 10 6 m milli 10 3 k kilo 103 M mega 106 The following abbreviations are used in this manual A amperes C Celsius dB decibels degrees...

Page 8: ...O 16 User Manual part number 320295 01 Lab NB User Manual part number 320174 01 IBM PC XT AT users AT MIO 16F 5 User Manual part number 320266 01 AT MIO 16 User Manual part number 320476 01 Lab PC Use...

Page 9: ...2 7 Storage Environment 2 7 Board to Board Cabling 2 7 Mounting 2 9 Application Notes 2 9 Soldering and Desoldering on the BNC 2080 Board 2 9 Channel Configurations 2 9 MIO 16 Analog Input 2 9 Connect...

Page 10: ...or 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 Connecti...

Page 11: ...2 19 Analog Output Schematic for DACs DAC0 OUT Shown 2 23 Figure 3 1 BNC 2081 Analog Breakout Board 3 1 Figure 3 2 BNC 2081 Board Parts Locator Diagram 3 2 Figure 3 3 Onboard Equivalent Circuit 3 3 Fi...

Page 12: ...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...

Page 13: ...urrently be used with the BNC 208X Series boards Table 1 1 Data Acquisition Boards for Use with BNC 208X Series Boards NB Series Macintosh NuBus MC Series IBM PS 2 PC and AT Series PC XT AT Lab Series...

Page 14: ......

Page 15: ...0 5 m NB1 cable 181635 01 180524 05 BNC 2081 kit with 1 0 m cable 776599 10 BNC 2081 board 50 conductor 1 0 m NB1 cable 181635 01 180524 10 BNC 2081 without cable 776599 90 BNC 2081 board 181635 01 Y...

Page 16: ...m cable SC 2060 and 26 conductor cable 0 2 m cable 0 4 m cable SC 2061 and 26 conductor cable 0 2 m cable 0 4 m cable SC 2062 and 26 conductor cable 0 2 m cable 0 4 m cable SC 2050 and 50 conductor c...

Page 17: ...ectrostatic 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 Touch the antistatic...

Page 18: ......

Page 19: ...080 Board Chapter 2 BNC 208X Series User Manual 2 2 National Instruments Corporation Figure 2 2 illustrates the parts locator diagram for the BNC 2080 board Figure 2 2 BNC 2080 Board Parts Locator Dia...

Page 20: ...C Warning If the data acquisition board does not use pins 33 34 or pins 49 50 for power connections set switch S5 to position B Failure to set switch S5 to position B under these conditions could resu...

Page 21: ...mode BNC Connector 3 2 1 Channel 9 Center Case COMMON DIFF SE 5 V 5 V AIGND AIGND R21 R15 R20 R4 R11 R3 C2 C D A B E F G S2 AIGND AISENSE 1 2 3 NRSE RSE Jumpers Installed Here at Factory W1 Figure 2 3...

Page 22: ...d jumpers are inserted in the E and F positions of the input network as in Figure 2 3 These jumpers can be easily removed to build analog input signal conditioning circuits Several applications showin...

Page 23: ...g board If you want access to all MIO 16 signals via screw terminals you must use the SC 2070 or SC 2072 board For more information on the SC 205X Series boards the SC 206X Series boards or the SC 207...

Page 24: ...limited to 750 mA Physical Board dimensions including standoffs 7 9 by 4 9 by 1 725 in I O connectors Two 50 pin male ribbon cable connectors BNC connectors 24 Operating Environment Temperature 0 to 7...

Page 25: ...SSR Figure 2 6 Connection between an MIO 16 Board the BNC 2080 Board and the SC 2070 72 Board or the MIO 16 and the BNC 2080 and SC 206X Series Boards via the SC 2050 Board Warning Do not connect the...

Page 26: ...cuum type tools work best Use care when desoldering to avoid damaging component pads Only rosin core electronic grade solder should be used Acid core solder damages the printed circuit board and compo...

Page 27: ...osition or in the SE position The single ended mode is configured by flipping the switches next to each pair of BNC connectors to SE This must be done to all eight switches in order to have 16 single...

Page 28: ...Chapter 2 BNC 2080 Board National Instruments Corporation 2 11 BNC 208X Series User Manual Figure 2 9 BNC 2080 Switch Configurations for an MIO 16 Configured in DIFF Mode Factory Default Setting...

Page 29: ......

Page 30: ...sources are outputs for thermocouples transformers battery powered devices optical isolators and isolation amplifiers The ground reference of a floating source must be tied to the ground of the data a...

Page 31: ...nfigured to supply a ground reference Therefore the MIO 16 should be configured for RSE mode In this configuration the negative input of the MIO 16 instrumentation amplifier is tied to the analog grou...

Page 32: ...puts When measuring ground referenced signals the external signal supplies its own reference ground point and the MIO 16 should not supply one Therefore the MIO 16 board should be configured for the N...

Page 33: ...is available the resistance is by substitution into Formula 2 1 39 789 1 or about 39 8 k1 This resistance must be divided by two to get the resistor value on each input of a differential channel Ther...

Page 34: ...ing Highpass Filters Simple R C highpass filters are easily installed in the BNC 2080 board on any differential input channel The filters are useful for accurate high frequency measurement and low fre...

Page 35: ...pacitances For example two 0 001 F capacitors in series have a net capacitance of 0 0005 F The two capacitors should be the same value or the CMRR is degraded If capacitors of 0 001 F are available th...

Page 36: ...in BNC Connector R4 R11 R15 R21 R3 R20 C2 6 34 k1 Resistor Channel 9 in Case Channel 1 in Center F G E To Input Multiplexer Input Schematic for ACH1 BNC Connector 0 001 F Capacitor C2 6 34 k1 Resisto...

Page 37: ...ta acquisition board 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 h...

Page 38: ...Channel 9 in Channel 1 in BNC Connector R4 R11 R15 R21 C2 10 k1 Resistor Channel 9 in Case Channel 1 in Center F G E To Input Multiplexer Input Schematic for ACH1 BNC Connector R3 10 k1 R20 10 k1 C2 1...

Page 39: ...ld junction compensation PC LPM 16 The analog input section of an PC LPM 16 data acquisition board consists of 16 ground referenced single ended channels therefore the only valid configuration for the...

Page 40: ...ons for optional signal conditioning components One of these is designated as a resistor and the other as a capacitor The equivalent circuit for DAC0 OUT is shown in Figure 2 19 DAC1 OUT circuitry is...

Page 41: ......

Page 42: ...our open positions for signal conditioning components All signal conditioning components are designated as resistors but capacitors can be inserted for the construction of R C filters The board is shi...

Page 43: ...on MIO 16 Input Schematic for ACH1 BNC Connector J4 Case 5 V AIGND R4 R5 R6 R14 A B C D Jumper Installed Here at Factory Figure 3 3 Onboard Equivalent Circuit The components are numbered differently...

Page 44: ...The jumper can be easily removed to build analog input signal conditioning circuits A few specific applications showing the use of these open component positions are discussed in Application Notes la...

Page 45: ...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 b...

Page 46: ...male ribbon cable connectors BNC connectors 15 Operating Environment Temperature 0 to 70 C Relative humidity 5 to 90 noncondensing Storage Environment Temperature 55 to 125 C Relative humidity 5 to 9...

Page 47: ...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 boa...

Page 48: ...n 20 to 30 W when soldering to the board To desolder on the BNC 2081 vacuum type tools work best Use care when desoldering to avoid damaging component pads Only rosin core electronic grade solder shou...

Page 49: ...board The inputs of the BNC 2081 board can be left in the factory original condition that is with a jumper in the series position C see Table 3 1 and Figure 3 3 Signal conditioning circuitry such as t...

Page 50: ...determine the resistance required is preferable because more standard resistor values are available If a capacitance of 1 F is available then the resistance is by substitution into Formula 3 1 39 789...

Page 51: ...r inputs you can add a highpass filter with a cutoff frequency of 20 kHz The 20 Hz noise then attenuates by 60 dB Notice that your 20 kHz signal also attenuates but by only 3 dB Do not neglect any pot...

Page 52: ...g inputs of the BNC 2081 board Attenuators can be used to reduce a signal that is outside the normal input range of the data acquisition board 10 V maximum Warning The BNC 2081 board is not designed f...

Page 53: ...the Lab board VLab is as follows VLab VSC G where VSC is the voltage applied to the BNC connectors of the BNC 2081 board The accuracy of this gain equation depends on the tolerances of the resistors u...

Page 54: ...open component positions for optional signal conditioning components One of these is designated as a resistor and the other as a capacitor The equivalent circuit for DAC0 OUT is shown in Figure 3 12 C...

Page 55: ...r Manual BNC Connector DAC0 OUT AOGND R9 C5 Jumpers Installed Here at Factory DAC0 OUT Figure 3 13 Analog Output Schematic for DACs DAC0 OUT Shown Additional Signal Connection Information For more inf...

Page 56: ...e what signal conditioning is desired for the analog inputs and install the necessary components into the open component positions If no signal conditioning is needed on an input then the factory inst...

Page 57: ...ing 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 b...

Page 58: ...ting Position Right Hand Mounting Position Figure 4 1 Mounting Locations for the BNC 208X Series Board and SC 207X Series Board SC 205X Series Board or SC 206X Series Board BNC 208X Series Board Left...

Page 59: ...g your board to the rack mount as shown in Figure 4 3 Notice that jumper W2 BNC 2080 and jumper W1 BNC 2081 can connect the digital ground for both boards to the metal standoffs attached to the board...

Page 60: ...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 61: ...s boards using an appropriate cable MIO 16 50 Conductor Cable BNC 2080 MIO 16 BNC 2080 SC 2070 SC 2072 SC 206X Series SC 2050 Digital I O OR Lab Board BNC 2081 50 Conductor Cable Lab Board BNC 2081 50...

Page 62: ...oards to the MIO 16 Signal Connections Ribbon Cable Connectors The pinout for the 50 pin ribbon cable connector on the BNC 2080 board is exactly the same as the 50 pin connector on the MIO 16 and LPM...

Page 63: ...h 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 Corporate Headquarters 512 795 8248 Technical support fax 8...

Page 64: ...iciently 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 N...

Page 65: ...l Edition Date September 1993 Part Number 320407 01 Please comment on the completeness clarity and organization of the manual If you find errors in the manual please record the page numbers and descri...

Page 66: ...analog output lab board 3 14 MIO 16 2 23 schematic for DACs DAC0 OUT 2 23 3 15 attenuators building BNC 2080 2 20 BNC 2081 3 12 for use with differential inputs 2 21 B bias return resistor 2 14 BNC 20...

Page 67: ...6 used with SC 2080 2 7 desoldering BNC 2080 2 9 BNC 2081 3 8 DGND vii DIFF vii DIFF mode 2 11 channel component positions 2 5 onboard equivalent circuit 2 4 differential inputs 2 13 2 15 differential...

Page 68: ...23 ground referenced signal sources BNC 2080 2 15 BNC 2081 3 8 H hardware installation 4 1 highpass filters BNC 2080 on differential channel 1 2 19 BNC 2081 on channel 1 3 12 building BNC 2080 2 17 B...

Page 69: ...t 4 5 locations 4 3 N NRSE vii mode 2 12 O onboard equivalent circuit BNC 2081 3 3 for DIFF mode 2 4 operating environment BNC 2080 2 7 BNC 2081 3 6 optional equipment 1 3 P PC LPM 16 2 1 2 22 switch...

Page 70: ...mode switch configurations 2 22 shield ground BNC 2080 2 5 BNC 2081 3 4 signal conditioning accessories 1 4 signal conditioning capability BNC 2080 2 6 BNC 2081 3 5 signal connections BNC 2081 4 7 sig...

Page 71: ...SE and NRSE modes 2 12 differential mode 2 10 for SE mode LPM 16 2 22 single ended mode 2 10 switch S5 2 3 settings 2 3 settings for data acquisition boards 2 3 T timing and digital signals 3 5 U unpa...

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