Home

BNC-208X Series User Manual

1. Oo BNC Connector 10 kQ Resistor Input Schematic for ACH Channel 1 Center To BNC Connector Input R14 10kQ Multiplexer Figure 3 11 Attenuator for Use with BNC 2081 Board Inputs National Instruments Corporation 3 13 BNC 208X Series User Manual BNC 2081 Board Chapter 3 Example Using the values in Figure 3 12 es Le TOkQ 10kQ Therefore VLab 1 2 Vsc When the Lab board is configured for 5 V inputs the board can acquire 10 V signals with this attenuator circuit The input impedence of the circuit is 10 kQ 10 KQ 20 KQ The source impedence of the circuit is as follows 10 KQ 10 KQ 5 KQ Lab Board Analog Output Analog output BNC connectors each have two 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 DACO OUT is shown in Figure 3 12 Circuitry for DAC1 OUT is the same When the board is shipped 0 Q jumpers are inserted into the R 7 an R18 positions These can be easily removed to build passive analog output signal conditioning circuits such as voltage dividers and lowpass filters Figure 3 12 shows the DACO OUT schematic Figure 3 13 shows the analog output schematic for DACs with DACO OUT shown DACO OUT BNC C t Jumpers Installed onnector Here at Factory Figure 3 12 DACO OUT Schematic BNC 208X Series User Manual 3 14 National Instrumen
2. ooooocccnoccccconacononcnonancnonnnccnananann 4 4 Double Height Mounting iris cidad irritan encia casaine eh 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 oooooncncccnconennnnononccnnccnonannononicnncnnanennoninonorcnccnennononiniccnons 4 6 BNC 208X Series User Manual 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 PoOSItIONS ooooccooccconocccnonnnononacononccnnnnccnnnncnnns 2 5 Table 2 3 Data Acquisition Boards Used with the BNC 2080 Board coooconoccnnocccocncnoncnns 2 7 Table 3 1 Component Positions in Each Chamnel ooooonnnncccnoncccnoncccnnonanononcnnnnnccnonnccnanancnns 3 4 Table 3 2 Data Acquisition Boards Used with the BNC 2081 Board eee eeeeeeee 3 6 BNC 208X Series User Manual xi National Instruments Corporation Chapter 1 Introduction This chapter 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 The BNC 2080 and BNC 2081 boards are two analog breakout boards with signal labeled BNC connectors and analog signal conditioning areas T
3. o Jo o ON o S q la o o o o 24 CHANNEL DIGITAL 1 0 ASSY181639 01 REV B 01931 S N e Shield O 4 Product Two User Selection Name Defined Ports Part Number and Revision Letter Figure 3 2 BNC 2081 Board Parts Locator Diagram Analog Input Each analog input has four 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 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 3 2 O National Instruments Corporation Chapter 3 BNC 2081 Board Input Schematic for ACH1 Channel 1 Center BNC Connector R4 r Jumper Installed Here at Factory To Input Multiplexer on MIO 16 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 3 3 BNC 208X Series User Manual BNC 2081 Board Chapter 3 Table 3 1 Component Positions in Each Channel Position in Figure 3 3 Channel A B C D NA wu b amp b Y NY When the board is shipped a jum
4. Introduction Chapter 1 Signal Conditioning Accessories SSR Series eight channel backplane with 0 4 m cable for SC 2050 Series 776290 18 SC 2070 and 50 conductor cable 0 5 m cable 1 0 m cable SC 2071 and 50 conductor cable 0 5 m cable 1 0 m cable SC 2072 and 50 conductor cable 0 5 m cable 1 0 m cable SC 2072D and 50 conductor cable 0 5 m cable 1 0 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 cable 0 5 m cable 1 0 m cable SC 2051 and 50 conductor cable 0 5 m cable 1 0 m cable SC 2052 and 50 conductor cable 0 5 m cable 1 0 m cable SC 2053 and 50 conductor cable 0 5 m cable 1 0 m cable BNC 208X Series User Manual 776358 00 776358 10 776358 01 776358 11 776358 02 776358 12 776358 102 776358 112 776336 00 776336 10 776336 01 776336 11 776336 02 776336 12 776335 00 776335 10 776335 01 776335 11 776335 02 776335 12 776335 03 776335 13 National Instruments Corporation Chapter 1 Introduction Software Support The BNC 208X Series boards require no additional software support beyond that provided for the data acquisition board in use 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
5. BNC 208X Series User Manual 2 20 National Instruments Corporation Chapter 2 To Input G Multiplexer BNC 2080 Board Channel 9 in A Channel 1 in O D BNC Connector B ial 10 kQ Resistor C Input Schematic for ACH1 R3 10 kQ Channel 1 in Center C2 10kQ BNC Connector Resistor Channel 9 in Case R20 10 kQ Figure 2 16 Attenuator for Use with Differential Inputs National Instruments Corporation 2 21 BNC 208X Series User Manual BNC 2080 Board Chapter 2 Example Using the values in Figure 2 13 ee 10 kQ a TOkKQ 10kQ 410kQ 3 Therefore 1 Vmio 3 Ysc 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 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 BNC 2080 is also RSE mode In this mode all 16 analog input BNC connectors are used Switches S1 through S4 and S6 through S9 must be in the SE position and jumper W1 should be in the AIGND COMMON position as shown in Figure 2 17 and Figure 2 18 respectively Single
6. Ended Mode Figure 2 17 Switch Configurations for SE Mode PC LPM 16 Note All the switches are required to be in the same position that is S1 through 4 and S6 through S9 must all be in the SE position for use with the PC LPM 16 BNC 208X Series User Manual 2 22 National Instruments Corporation Chapter 2 BNC 2080 Board AISENSE COMMON AIGND Figure 2 18 Ground Reference Jumper Position for Use with the PC LPM 16 The application information given for MIO 16 in the RSE input mode also applies to the PC LPM 16 MIO 16 Analog Output Analog output BNC connectors each have two 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 DACO OUT is shown in Figure 2 19 DAC1 OUT circuitry is identical to that of DACO OUT When the board is shipped 0 62 jumpers are inserted into the R9 position These can be easily removed to build passive analog output signal conditioning circuits such as voltage dividers and lowpass filters DACO OUT Jumpers Installed Here at Factory Figure 2 19 Analog Output Schematic for DACs DACO OUT Shown O National Instruments Corporation 2 23 BNC 208X Series User Manual Chapter 3 BNC 2081 Board This chapter describes the BNC 2081 board in detail including its function specifications compatibility connection mounting and application notes The BNC 2081 i
7. G BNC Connector Channel 9 in Case R20 19 8 kQ Figure 2 13 Lowpass Filter on Differential Channel 1 Building 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 frequency noise rejection By substituting resistance and capacitance values into the following formula hereafter referred to as Formula 2 2 you can calculate a simple one pole R C filter to have a 3 dB point fe 1 fe RARO Formula 2 2 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 BNC 2080 Board Chapter 2 Amplitude 0 0001 0 001 0 01 0 1 1 Normalized Frequency Figure 2 14 Normalized Frequency Response of Highpass Filter When measuring high frequency signals about 50 kHz if you have 50 Hz noise on your inputs you can add a highpass filter with a cutoff frequency of 50 kHz The 50 Hz noise then attenuates by 60 dB Notice that your 50 kHz signal also attenuates but by only 3 dB Do not neglect any potential attenuation of signals of interest if you add a low order filter You must also choose the filter component values The resistance or the capacitance can be selected arbitrarily one value determi
8. Ground Reference Jumper Position for Use with the PC LPM 16 2 23 Analog Output Schematic for DACs DACO OUT Shown eee 2 23 BNC 2081 Analog Breakout Board sico ida 3 1 BNC 2081 Board Parts Locator DiagraM ooonocccnoncccnoncccnonnccnnnnccnoncncnnnncnnnncnnnns 3 2 Onboard Equivalent Cr A aden eke 3 3 WEJ mper SSMS A O esau a ia 3 4 Direct Connection between a Lab Board and the BNC 2081 Board 3 7 Connection between a Lab Board the BNC 2081 and the SC 2071 Board or the Connection between a Lab Board the BNC 2081 and the SC 206X Series Board via the SC 2053 Board cccccncnnnnnocccnnnnonononananacicncnnononananicnicicnnnnons 3 7 Normalized Frequency Response of Lowpass Filter cess eeeeeeeeeeseeeeeeeees 3 9 Lowpass Filter on Camello A adhd 3 10 Normalized Frequency Response of Highpass Filter oooonnncccnnoncccnncccnnncncnn 3 11 Highpass Filter on Channel 1 siii As artis 3 12 Attenuator for Use with BNC 2081 Board Inputs ooonnocccnnoccccnocccinanccinnncnnn 3 13 DACOOUT Schema 1 A ii 3 14 Analog Output Schematic for DACs DACO OUT Shown ccooocccnoccninonccnnnncnnn 3 14 Mounting Locations for the BNC 208X Series Board and SC 207X Seres Boardu heenreis e eet Ota ee A AR RE E eid ees 4 3 Mounting Locations for the BNC 208X Series Board and SC 205X Series Board or SC 206X Series BOal O oooooccnncononnconnnonanononcnoncnnnncnnn cono ncno recono 4 3 Attaching a Mountable Board to the Chassis
9. 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 Applications of National Instruments products involving medical or clinical treatment can create a potential for accidental injury caused by product failure or by errors on the part of the user 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 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 National Instruments products are NOT intended to be a substitute for any form of established process procedure or equipment used to monitor or safeguard human health and safety in medical or clinical treatment Preface This manual describes the electrical and mechanical aspects of the BNC 2080 and 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
10. board and components Connecting Nonreferenced or Floating Signal Sources A floating signal source is a signal source that is not connected in any way to the building ground system but has an isolated ground reference point If an instrument or device has an isolated output that instrument or device falls into the floating signal source category Some examples of floating signal 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 acquisition board No special components are needed to measure signals from floating sources connected to the BNC 2081 board Because the negative side of the single ended inputs is grounded all floating sources are referenced to the same ground 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 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 3 8 National Instruments Corporation Chapter 3 BNC 2081 Board A grounded signal source is connected in some way to the building system ground therefore the signal source is already connected
11. board must be used with the Lab board Figure 3 6 shows a connection using the SC 2053 cable adapter board SC 2071 50 Conductor Cable SC 206X Series Lab Board BNC 2081 SC 2053 A Series SC 206X Digital I O Series Figure 3 6 Connection between a Lab Board the BNC 2081 and the SC 2071 Board or the Connection between a Lab Board the BNC 2081 and the 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 Attempts to use the BNC 2081 board with products for which it was not intended can result in damage to the BNC 2081 board the data acquisition board or the host computer National Instruments is not liable for damages resulting from these connections The BNC 2081 board uses a 50 pin ribbon cable connector to connect to the 50 pin I O connector on either a Lab data acquisition board an SC 2053 cable adapter board or the SC 2071 If the BNC 2081 board is to be used with the SC 2053 or the SC 2071 boards and is mounted in a rack the cable should run underneath the BNC 2081 board for easier access to the BNC 2081 For more information see Chapter 4 Installation and Connections National Instruments Corporation 3 7 BNC 208X Series User Manual BNC 2081 Board Chapte
12. but by only 3 dB Do not neglect any potential attenuation of signals of interest if you add a low order filter You must also choose the filter component values The resistance or the capacitance can be selected arbitrarily one value determines the other Picking the capacitor first and letting its value determine the resistance required is preferable because more standard resistor values are available If a 0 001 uF capacitor is available the resistance is by substitution into Formula 3 2 7 958 Q or about 8 0 KQ Therefore in this example the input channel has a 7 96 kQ resistor or the closest standard value in position D and a 0 001 uF capacitor in position C The closest standard 5 tolerance resistor is 8 2 KQ 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 BNC 2081 Board Chapter 3 Channel 1 Center 9 BNC Connector LJ 8 2 kQ Resistor 0 001 uF Capacitor Input Schematic for ACHI R6 0 001uF Capacitor Channel 1 Center To BNC Connector Input R14 8 2 KQ Multiplexer Figure 3 10 Highpass Filter on Channel 1 Building Attenuators Voltage Dividers Attenuators can be connected to the analog inputs of the BNC 2081 board Attenua
13. contains a 1 0 m cable and one kit contains no cable listed as follows Kit Name Kit Part Kit Component Board Part Number Number BNC 2080 kit with 0 5 m 716579 05 BNC 2080 board 181630 01 cable 50 conductor 0 5 m NB1 cable 180524 05 BNC 2080 kit with 1 0 m 776579 10 BNC 2080 board 181630 01 cable 50 conductor 1 0 m NB1 cable 180524 10 BNC 2080 without cable 776579 90 BNC 2080 board 181630 01 BNC 2081 kit with 0 5 m 776599 05 BNC 2081 board 181635 01 cable 50 conductor 0 5 m NB1 cable 180524 05 BNC 2081 kit with 1 0 m 776599 10 BNC 2081 board 181635 01 cable 50 conductor 1 0 m NB1 cable 180524 10 BNC 2081 without cable 776599 90 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 Kit Component Part Number BNC 208X Series User Manual 320407 01 If your kit is missing any of the components or if you received the wrong version contact National Instruments Optional Equipment Equipment Part Number Type NBS cable for the AT MIO 16D 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 1 3 BNC 208X Series User Manual
14. facilitate use with differential inputs any of the three modes can be selected If the MIO 16 board is configured in the RSE mode all 16 analog input channels are referenced to AIGND If the MIO 16 board is configured in the NRSE mode resistors should not be inserted into positions B or D of Figure 2 3 for any channel Doing so can cause inaccurate readings because of incorrect ground reference Resistors can be inserted into these positions in the RSE mode For information on the input configurations see your MIO 16 board user manual The BNC 2080 board can be configured to work with all three MIO 16 input configurations The DIFF mode is configured by flipping the switches next to each pair of 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 analog ACHO through ACH7 BNC connectors are used The remaining eight National Instruments Corporation 2 9 BNC 208X Series User Manual BNC 2080 Board Chapter 2 analog ACH8 through ACH15 BNC connectors are not used The MIO 16 board must also be configured for differential input The jumper W1 position is irrelevant in DIFF mode o m e DIFF Mode Factory Default Setting Figure 2 7 Switch Configurations for Differential Mode or Single Ended Mode Note All of the switches are required to be in the same position that is S1 through S4 and S6 through S9 must all be in either the DIFF position
15. open component positions in the input paths you can insert resistors and capacitors for conditioning the 16 single ended or 8 differential analog input signals The BNC 208X Series boards can also be used in conjunction with the other signal conditioning accessories including the SC 207X Series boards For connection of multiple signal conditioning accessories an SC 205X Series cable adapter board must be used O National Instruments Corporation 2 1 BNC 208X Series User Manual BNC 2080 Board Chapter 2 Figure 2 2 illustrates the parts locator diagram for the BNC 2080 board Product Name Part Number and RSE or NRSE Revision Letter Selection 50 Pin 1 0 gt E A Two User Connectors Te Defined Ports Solder Holes for Remaining 1 0 Signals DIFF or SE Mode Selector Switch Eight total Shield Ground Selection MIO 16 or LPM 16 Selector Switch Figure 2 2 BNC 2080 Board Parts Locator Diagram BNC 208X Series User Manual 2 2 O National Instruments Corporation Chapter 2 BNC 2080 Board Power Connections Because the BNC 2080 board is an analog breakout board for both the MIO 16 and PC LPM 16 boards it has a flexible power connection scheme Switch S5 is responsible for selecting the power inputs from the I O cable Switch S5 is a three position switch that configures the 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 pos
16. position cable underneath the BNC 208X Series board to the adjoining board The BNC 208X Series board occupies half of a 19 in rack as shown in Figure 4 1 and Figure 4 2 BNC 208X Series User Manual 4 2 O National Instruments Corporation Chapter 4 Installation and Connections BNC 208X Series Board SC 207X Series Board Left Hand Right Hand Mounting Mounting Position Position Figure 4 1 Mounting Locations for the BNC 208X Series Board and SC 207X Series Board SC 205X Series Board BNC 208X Series Board or 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 O National Instruments Corporation 4 3 BNC 208X Series User Manual 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 Qa Top Washers and Screw Metal Standoff UN Circuit Board eS Rack Mount _ Washer Lock Washer _ Screw Figure 4 3 Attaching a Mountable Board to the Chassis Be sure to include the washers around the screws when attaching your board to
17. 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 Rack mounting does not automatically ground the boards to the metal chassis unless the appropriate jumper is set If two BNC 208X Series boards connected to different data acquisition boards need to be stacked double height mounting within one rack mount chassis is possible Because only one BNC 208X Series board can be used with each data acquisition board this situation occurs only if two or more data acquisition boards are being used 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 4 4 O National Instruments Corporation Chapter 4 Installation and Connections Figure 4 4 illustrates double height mounting First row of boards mount in bottom of Figure 4 4 Double Height Mounting External Power Connection If Necessary Your BNC 208X Series board draws very little current from the computer power supply If several high current 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 t
18. 1 le ORO Formula 3 1 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 1 0 1 1 10 100 1 000 10 000 fe Normalized Frequency Figure 3 7 Normalized Frequency Response of Lowpass Filter National Instruments Corporation 3 9 BNC 208X Series User Manual BNC 2081 Board Chapter 3 When measuring low frequency signals about 4 Hz if you have 400 Hz noise on your inputs you can add a lowpass filter with a cutoff frequency of 4 Hz The 400 Hz noise then attenuates by 40 dB Notice that your 4 Hz signal also attenuates but by only 3 dB Do not neglect any potential attenuation of signals of interest by this low order filter You must also choose the filter component values The resistance or the capacitance can be selected arbitrarily one value determines the other Picking the capacitor first and letting its value determine the resistance required is preferable because more standard resistor values are available If a capacitance of 1 uF is available then the resistance is by substitution into Formula 3 1 39 789 Q or about 39 80 kQ Therefore in this example the input has a 39 80 kQ resistor or the closest standard value in its series position C The closest standard 5 tolerance resistor is 39 KQ For a lowpass filter on a single ended input 5 tolerance resistors suffice F
19. 4 BNC connectors 18 analog MIO 16 16 analog LPM 16 See note 4 digital and 2 user defined Signal conditioning capability Seven open component positions per channel that include connections from each input to ground 5 V each other and series connections to the inputs of the data acquisition boards Other signals Solder holes for remaining MIO 16 signals Note The DACO 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 2 6 National Instruments Corporation Chapter 2 BNC 2080 Board Power Requirements Power consumption at 5 VDC 5 Typical 12 mA with no signal conditioning installed Maximum 750 mA from host computer Note The power specifications pertain to the power supply of the host computer The maximum power consumption of the BNC 2080 board is a function of the signal conditioning components installed If the board is being powered from the host computer the maximum 5 V current draw is fuse limited to 750 mA Physical Board dimensions including standoffs 7 9 by 4 9 by 1 725 in VO connectors Two 50 pin male ribbon cable connectors BNC connectors 24 Operating Environment Temperature 0 to 70 C Relative humidity 5 to 90 noncondensing Storage Environment Temperature 55 to 125 C Relative humidity 5 to 90 noncondensing Board to Board Cabling The BNC 2080 board
20. 85 01 e SC 206X Series User Manual part number 320200 01 e 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 e Macintosh NuBus users NB MIO 16X User Manual part number 320157 01 NB MIO 16 User Manual part number 320295 01 Lab NB User Manual part number 320174 01 e 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 User Manual part number 320205 01 Lab PC User Manual part number 320502 01 PC LPM 16 User Manual part number 320287 01 e IBM PS 2 Micro Channel users MC MIO 16 User Manual part number 320130 01 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 These forms are in the appendix at the end of this manual National Instruments Corporation vii BNC 208X Series User Manual Contents Chapter 1 BRET OCU COR iaa 1 1 What Your Kit Should COM rio 1 3 A OR 1 3 signal Conditioning ACES ds 1 4 OEE W ATE A EN 1 5 Unpackint id eal eta ot a eaten ees 1 5 Chapter 2 BNC 2080 Board oia 2 1 Power Co
21. BNC 208X Series User Manual Analog BNC Breakout Boards September 1993 Edition Part Number 320407 01 O Copyright 1991 1994 National Instruments Corporation All Rights Reserved 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 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 03 3788 1921 Mexico 95 800 010 0793 Netherlands 03480 33466 Norway 32 84 84 00 Singapore 2265886 Spain 91 640 0085 Sweden 08 730 49 70 Switzerland 056 20 51 51 Taiwan 02 377 1200 U K 0635 523545 Limited Warranty The BNC 208X Series boards are 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 The media on which you receive National Instruments software are warranted not to fail to execute programming instructions due to defects in materials and workmanship for a period of 90 days from date of shipment as evidenced by receipts or other documentation Na
22. Building Lowpass Filters Simple R C lowpass filters are easily installed in the BNC 2080 board on any differential input channel The filters are useful for accurate measurement and noise rejection By substituting resistance and capacitance values into the following formula hereafter referred to as Formula 2 1 you can calculate a simple one pole R C filter to have a 3 dB point cutoff frequency fc 1 fe RARO Formula 2 1 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 BNC 2080 Board Chapter 2 Amplitude 1 0 1 10 100 1 000 10 000 Normalized Frequency Figure 2 12 Normalized Frequency Response of Lowpass Filter When measuring low frequency signals about 4 Hz if you have 400 Hz noise on your inputs you can add a lowpass filter with a cutoff frequency of 4 Hz The 400 Hz noise then attenuates by 40 dB Notice that your 4 Hz signal also attenuates but by only 3 dB Do not neglect any potential attenuation of signals of interest by this low order filter You must also choose the filter component values The resistance or the capacitance can be selected arbitrarily one value determines the other Picking the capacitor first and letting its value determine the resistance required is preferable because more standard resi
23. ED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER NATIONAL INSTRUMENTS WILL NOT BE LIABLE FOR DAMAGES RESULTING FROM LOSS OF DATA PROFITS USE OF PRODUCTS OR INCIDENTAL OR CONSEQUENTIAL DAMAGES EVEN IF ADVISED OF THE POSSIBILITY THEREOF This limitation of the liability of National Instruments will apply regardless of the form of action whether in contract or tort including negligence 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 Instruments installation operation or maintenance instructions owner s modification of the product owner s abuse misuse or negligent acts and power failure or surges fire flood accident actions of third parties or other events outside reasonable control Copyright Under the copyright laws this publication may not be reproduced or transmitted in any form electronic or mechanical including photocopying recording storing in an information retrieval system or translating in whole or in part without the prior written consent of National Instruments Corporation Trademarks Product and company names listed are trademarks or trade names of their respective companies WARNING REGARDING
24. F SE CATSENSE COMMON AIGND ON REF SE AISENSE COMMON we p AIGN pe z a Q f g 6 E l y o ra Ll Y Q 2 Referenced Single Nonreferenced Single Ended Mode RSE Ended Mode NRSE N O BNC 208001991 S N ASSY181630 01 REU A BELL ELELL 3338 Figure 2 10 BNC 2080 Switch Configurations for an MIO 16 Configured in RSE and NRSE Modes BNC 208X Series User Manual 2 12 O National Instruments Corporation Chapter 2 BNC 2080 Board As described in Chapter 2 of your MIO 16 board user manual the input configuration of the MIO 16 depends on the type of signal source There are two types of signal sources nonreferenced or floating signals and ground referenced signals To measure floating signal sources the MIO 16 should be configured for the RSE mode or DIFF mode with bias resistors To measure ground referenced signal sources the MIO 16 should be configured for the NRSE mode or DIFF mode Both types of signal sources and the recommended methods for MIO 16 board connection are discussed as follows Connecting Nonreferenced or Floating Signal Sources A floating signal source is a signal source that is not connected in any way to the building ground system but has an isolated ground reference point If an instrument or device has an isolated output that instrument or device falls into the floating signal source category Some examples of floating signal sources are outputs for t
25. NC 2080 board make adding signal conditioning components to the analog input signals easier Several applications are covered in this section including filtering and attenuation The figures in this section give examples on a specific input channel If you want to install the circuit on a different channel consult Table 2 3 to determine the equivalent component positions for the other channels Soldering and Desoldering on the BNC 2080 Board The applications discussed here require you to make modifications to the printed circuit board usually by removing jumpers and adding components The BNC 2080 board is shipped with wire jumpers in the E and F positions see Table 2 3 and Figure 2 3 Use a low wattage soldering iron 20 to 30 W when soldering to the board To desolder on the BNC 2080 vacuum 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 components Channel Configurations MIO 16 Analog Input This section discusses the input configuration of the MIO 16 board and the corresponding configurations of the BNC 2080 The analog input channels of an MIO 16 data acquisition board can be configured for one of three input modes differential DIFF input mode referenced single ended RSE input mode or nonreferenced single ended NRSE input mode Although the open component positions are placed to
26. SENSE COMMON Channel 9 Channel 1 Center Center BNC Connector BNC Connector Jumpers Installed Here at Factory To Input Multiplexer on MIO 16 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 2 4 National Instruments Corporation Chapter 2 BNC 2080 Board Table 2 2 DIFF Mode Channel Component Positions When the board is shipped 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 showing the use of these open component positions are discussed in the section titled Application Notes later in this chapter Shield Ground Jumper W2 is used to connect digital ground DGND to a grounded metal case This option is useful only if the 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 2 5 BNC 208X Series User Manual BNC 2080 Board Chapter 2 Fuse and Power LED The 5 V line from the data acquisition board is protected by a 750 mA fus
27. acking 1 5 board dimensions BNC 2080 2 7 BNC 2081 3 6 C cable adapter boards installing 4 2 cabling board to board National Instruments Corporation Index 1 BNC 208X Series User Manual Index BNC 2080 2 7 BNC 2081 3 6 channel configurations 2 9 channels number of BNC 2080 2 6 BNC 2081 3 5 CMRR vii connections 4 1 D DACO OUT schematic 3 14 data acquisition boards 2 1 4 6 for use with BNC 208X 1 1 used with BNC 2081 3 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 mode switch configurations 2 10 digital and timing signals BNC 2080 2 6 BNC 2081 3 5 DIO connector 3 5 double height mounting 4 5 E external power connection 4 5 F 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 BNC 2080 2 15 BNC 2081 3 9 fuse and power LED BNC 2080 2 6 BNC 2081 3 5 G general purpose termination breadboards SC 207X 4 2 ground reference jumper 2 10 for use with LPM 16 2 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 ch
28. and compatible computers and Macintosh NuBus computers Organization of This Manual The BNC 208X Series User Manual is organized as follows e 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 e Chapter 2 BNC 2080 Board describes the BNC 2080 board in detail including its function specifications compatibility connection mounting and application notes e Chapter 3 BNC 2081 Board describes the BNC 2081 board in detail including its function specifications compatibility connection mounting and application notes e Chapter 4 Installation and Connections explains how to install and make connections to the BNC 208X Series boards e The Customer Communication appendix contains forms you can use to request help from National Instruments or to comment on our products e The Index contains an alphabetical list of key terms and topics in this manual including the page where you can find each one Conventions Used in This Manual The following conventions are used in this manual italic Italic text denotes emphasis a cross reference or an introduction to a key concept Lab board Lab board refers to the Lab PC Lab PC Lab NB and Lab LC boards Macintosh NuBus Macintosh NuBus refers to the Macintosh NuBus family o
29. annel 1 3 12 building BNC 2080 2 17 BNC 2081 3 11 normalized frequency response BNC 2080 2 18 BNC 2081 3 11 I I O connectors 2 7 installation 4 1 L 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 Index BNC 208X Series User Manual Index M MIO 16 2 1 analog input 2 9 analog output 2 23 mounting See also rack mounting BNC 2080 2 9 BNC 2081 3 8 double height 4 5 locations 4 3 N NRSE vil 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 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 O National Instruments Corporation R rack mounting 4 2 chassis cover attachment 4 7 ribbon cable connectors 4 7 RSE vil mode 2 12 S SC 205X connected to MIO 16 1 2 installation 4 2 SC 206X connected to MIO 16 1 2 SC 207X connected to MIO 16 1 2 installation 4 2 SE mode switch configurations 2 22 shield ground BNC 2080 2 5 BNC 2081 3 4 signal conditioning accessories 1 4 signal conditioning capabili
30. connect the BNC 2080 board to any board other than a National Instruments MIO 16 data acquisition board the SC 2070 72 board or the SC 2050 cable adapter board The BNC 2080 board is not compatible with any other data acquisition boards or cable adapter boards Attempts to use the BNC 2080 board with products for which it is not intended can result in damage to the BNC 2080 board the data acquisition board or the host computer National Instruments is not liable for damages resulting from these connections The BNC 2080 board uses a 50 pin ribbon cable connector to connect to the 50 pin I O connector on either a data acquisition board the SC 2070 72 or the SC 2050 cable adapter board The BNC 2080 has two MIO 16 connectors for connecting to the SC 2070 72 board or the SC 206X Series board via the SC 2050 board For more information see Chapter 4 Installation and Connections BNC 208X Series User Manual 2 8 O National Instruments Corporation Chapter 2 BNC 2080 Board Mounting The BNC 2080 board is equipped with metal standoffs so the board can be placed on a workbench near the host computer You can use an optional rack mount chassis which can be fitted with a flat acrylic plastic cover When the BNC 2080 board is mounted in the chassis the board can be grounded to its metal standoffs and therefore to the rack For more information see Chapter 4 Installation and Connections Application Notes The open component positions on the B
31. directly connects to any of the data acquisition boards listed in Table 2 3 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 NBS cable available separately National Instruments Corporation 2 7 BNC 208X Series User Manual BNC 2080 Board Chapter 2 The data acquisition boards listed in Table 2 3 except for the AT MIO 16D connect to the BNC 2080 board as shown in Figure 2 5 The AT MIO 16D connects to the BNC 2080 via a 100 conductor type NBS ribbon cable available separately 50 Pin I O Connector N a BNC 2080 50 Conductor Cable 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 Figure 2 6 shows a connection using the SC 2050 cable adapter board 2070 72 50 Conductor a A Cable Digital I O SC 206X Series BNC 2080 SC 2050 or 50 Conductor 26 Conductor 8 Channel SSR Cable Cable 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
32. e If the red power LED does not light when the data acquisition board is powered on check both the 750 mA fuse on the BNC 2080 board and the output fuse if any on the MIO 16 board Information on connecting power is given in Chapter 4 Installation and Connections Digital and Timing Signals All of the analog signals and a few digital signals from the MIO 16 data acquisition board are made available at BNC connectors on the BNC 2080 board Because these signals are not conditioned or changed in any way by the BNC 2080 board refer to your MIO 16 board user manual for information on the use of these signals If you want optical isolation of or relay control by the digital I O lines you must use the SC 2050 cable adapter board and the appropriate SC 2060 digital signal conditioning 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 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 Specifications This section lists the specifications of the BNC 2080 analog breakout board These ratings are typical at 25 C unless otherwise stated The operating temperature range for this board is 0 to 70 C Analog Input Number of channels 8 differential 16 single ended Field connections 2
33. electrostatic discharge To avoid such damage in handling the board take the following precautions e Touch the antistatic package to a metal part of your computer chassis before removing the board from the package e 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 O National Instruments Corporation 1 5 BNC 208X Series User Manual Chapter 2 BNC 2080 Board This chapter describes the BNC 2080 board in detail including its function specifications compatibility connection mounting and application notes The BNC 2080 is an analog breakout board that makes it easy to connect to all MIO 16 or PC LPM 16 analog signals and a few digital signals via BNC connectors All other MIO 16 signals are accessible via solder holes in the board next to data acquisition board input connectors Passive analog input signal conditioning such as filters and dividers can also be added 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 Figure 2 1 shows the BNC 2080 board Figure 2 1 BNC 2080 Analog Breakout Board The BNC 2080 board has BNC connectors for all analog signals a few digital signals and two user defined connectors With
34. ent 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 If you find errors in the manual please record the page numbers and describe the errors Thank you for your help Name Title Company Address Phone Mail to Technical Publications Fax to Technical Publications National Instruments Corporation National Instruments Corporation 6504 Bridge Point Parkway MS 53 02 MS 53 02 Austin TX 78730 5039 512 794 5678 Index A abbreviations used in the manual vi acronyms used in the manual vii analog breakout board 2 1 analog input 2 3 2 6 3 2 field connections 2 6 MIO 16 2 9 to 2 13 number of channels 2 6 other signals 2 6 signal conditioning capability 2 6 analog output lab board 3 14 MIO 16 2 23 schematic for DACs DACO 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 2080 2 1 connected to MIO 16 1 2 parts locator diagram 2 2 BNC 2081 3 1 analog breakout board 3 1 parts locator diagram 3 2 BNC 208X board connection 4 6 connected to MIO 16 1 2 contents of kit 1 3 unp
35. erances than resistors and matching of the input impedances is crucial for good common mode rejection The BNC 2080 board open component locations do not facilitate R C highpass filters with the MIO 16 board configured for single ended inputs Therefore if the MIO 16 board is configured for single ended inputs highpass filters must be built on the custom breadboard area 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 Chapter 2 To Input Multiplexer A Channel 1 Channel 9 o in BNC Connector eal SS 6 34 kQ Resistor Input Schematic for ACH R3 0 001 uF Capacitor Channel 1 in Center BNC Connector C2 6 34 KQ Resistor Channel 9 in Case R20 0 001 uF Capacitor Figure 2 15 Highpass Filter on Differential Channel 1 National Instruments Corporation 2 19 BNC 208X Series User Manual BNC 2080 Board 0 001 uF Capacitor BNC 2080 Board Chapter 2 Building Attenuators Voltage Dividers Attenuators can be connected to the analog inputs of the BNC 2080 board when the inputs from its data acquisition board are in DIFF mode The BNC 2080 board open component positions do not facilitate voltage dividers with the MIO 16 board configured for single ended inputs Therefore if the MIO 16 boa
36. f computers MIO 16 MIO 16 refers to the AT MIO 16 AT MIO 16D AT MIO 16F 5 AT MIO 16X MC MIO 16 NB MIO 16 NB MIO 16X and PC LPM 16 boards O National Instruments Corporation v BNC 208X Series User Manual Preface PC SC 205X SC 206X SC 207X Abbreviations PC refers to PC XT AT EISA and IBM PS 2 computers SC 205X refers to the SC 2050 SC 2051 SC 2052 and SC 2053 boards SC 206X refers to the SC 2060 SC 2061 and SC 2062 boards SC 207X refers to the SC 2070 SC 2071 and SC 2072 boards The following metric system prefixes are used with abbreviations for units of measure in this manual The following abbreviations are used in this manual A C dB F fe Hz in m Q T V WwW Acronyms u amperes Celsius decibels degrees farads cutoff frequency hertz inches meters ohms percent pi volts watts The following acronyms are used in this manual AC alternating current CMRR common mode rejection ratio DC direct current DGND digital ground DIFF differential input I O input output LED light emitting diode NRSE nonreferenced single ended input RSE referenced single ended input VDC volts direct current BNC 208X Series User Manual vi O National Instruments Corporation Preface Related Documentation The following National Instruments documents contain information that you may find helpful as you read this manual e SC 205X Series User Manual part number 3203
37. fall into this category Differential Inputs If the MIO 16 data acquisition board is configured for differential inputs ground referenced signal sources connected to the BNC 2080 board need no special components added to the BNC 2080 board The inputs of the BNC 2080 board can be left in the factory original condition that is with only jumpers in the two series positions E and F see Table 2 3 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 Single Ended Inputs 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 NRSE mode In this configuration all of the signal grounds should be tied to AISENSE which connects to the negative input of the instrumentation amplifier on the MIO 16 board The inputs of the BNC 2080 board can be left in the factory original condition that is with jumpers in the series position E or F depending on the channel The open positions that connect the input to AIGND B and D see Table 2 2 and Figure 2 3 should not be used in this configuration Referencing the signal to AIGND can cause inaccurate measurements resulting from an incorrect ground reference
38. he BNC 2080 and BNC 2081 breakout boards simplify the connection of analog signals some digital signals and two user defined connections to the data acquisition board in laboratory test and production environments The BNC 2080 can be configured to use 8 differential or 16 single ended analog input channels available on the board The boards have silkscreened component locations for resistors and capacitors for building single pole highpass and lowpass filters and voltage dividers 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 NB Series MC Series PC and AT Lab Series Macintosh IBM PS 2 Series PC XT AT and NuBus PC XT AT Macintosh NuBus 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 BNC 2081 Lab LC Lab NB Lab PC Lab PC Note When a board is referred to as an MIO 16 board the reference applies to the AT MIO 16 AT MIO 16D AT MIO 16F 5 AT MIO 16X MC MIO 16 NB MIO 16 NB MIO 16X and PC LPM 16 boards listed in Table 1 1 Similarly when a board is referred to simply as a Lab board the reference applies to the Lab LC Lab NB Lab PC and Lab PC boards listed in Table 1 1 All analog signals from the data acquisition board are made available at BNC connectors Each of the BNC 208X Series boards is connected directly to the data acquis
39. he SC 206X Series boards draw much more current than the SC 207X Series or the BNC 208X Series the SC 206X Series boards should be powered from the external supply and the SC 207X Series board or the BNC 208X Series board can be run from the host computer power supply 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 O National Instruments Corporation 4 5 BNC 208X Series User Manual Installation and Connections Chapter 4 BNC 208X Series Board Connection Figure 4 5 illustrates the connections from the BNC 2080 or BNC 2081 boards directly to data acquisition boards via a 50 conductor cable and to other SC Series boards using an appropriate cable BNC 2080 50 Conductor Cable SC 2070 50 Conductor Cable SC 2072 OR SC 206X BNC 2080 SC 2050 Series Digital I O Lab Board BNC 2081 50 Conductor Cable SC 2071 50 Conductor Cable SC 2072 OF SC 206X Series Lab Board BNC 2081 SC 2053 SC 206X Series SC 206X Digital I O Series 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 4 6 National Instruments Corporation 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 Ser
40. hermocouples 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 acquisition board to establish a local or onboard reference for the signal Differential Inputs To provide a return path for the instrumentation amplifier bias currents floating sources must have a 10 kQ to 100 kQ resistor to AIGND on one input if DC coupled or both inputs if AC coupled For more detailed information on connections to floating signal sources and differential inputs refer to the configuration chapter in your MIO 16 board user manual These bias resistors can be installed in positions B and D Table 2 2 and Figure 2 3 of the BNC 2080 board Figure 2 11 shows both the schematic and the component placement for a single 100 k bias return resistor on the negative input from a floating source connected to Channel 1 the D position in Table 2 2 Additional signal conditioning circuitry such as filters and attenuators as described in the sections 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 BNC 2080 Board Chapter 2 A Channel 1 Channel 9 234 in BNC Connector 100 kQ Resistor Input Schematic for ACH Channel 1 in Center T o G C2 BNC Connector
41. ies 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 The other end of the ribbon cable connects either to the data acquisition board or to one of the two 50 pin headers on the SC 205X Series board or the SC 207X Series board you installed for use with the data acquisition board Connecting the data acquisition board to J2 and using J1 running cable under board to daisy chain to any other board in the rack is the easiest method for connecting two or more boards 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 16 data acquisition boards The pinout for the 50 pin ribbon cable connector on the BNC 2081 board is exactly the same as the 50 pin connector on the Lab data acquisition board For more information on these connectors refer to your data acquisition board user manual Rack Mount Chassis Cover Attachment The optional 19 in rack mount accessory includes a flat acrylic plastic cover that can be installed using the four screws included in the kit Covering the top and bottom is required for safety reasons if an SC 206X Series board in the same enclosure is to be used in high voltage situations Remember that voltages above the 42 V peak canno
42. igure 3 8 shows both the schematic and the component placement for a 4 Hz lowpass filter placed on Channel 1 Channel 1 Center Oo BNC Connector ES SS 39 kQ Resistor 1 uF Capacitor Input Schematic for ACH1 R6 39 kQ Channel 1 Center C To R14 1uF BNC Connector Input Multiplexer Capacitor Figure 3 8 Lowpass Filter on Channel 1 BNC 208X Series User Manual 3 10 National Instruments Corporation Chapter 3 BNC 2081 Board Building Highpass Filters Simple R C highpass filters are easily installed in the BNC 2081 board on any input channel The filters are useful for accurate high frequency measurement and low frequency noise rejection By substituting resistance and capacitance values into the following formula hereafter referred to as Formula 3 2 you can calculate a simple one pole R C filter to have a 3 dB point fe 1 f ORO Formula 3 2 The response rolls off at a rate of 20 dB per decade drop in frequency thereafter A Bode plot of the amplitude versus normalized frequency is shown in Figure 3 9 Amplitude 1 0 1 0 0001 0 001 0 01 0 1 Normalized Frequency Figure 3 9 Normalized Frequency Response of Highpass Filter When measuring high frequency signals about 20 kH2 if you have 20 Hz noise on your 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
43. igure 3 9 Figure 3 10 Figure 3 11 Figure 3 12 Figure 3 13 Figure 4 1 Figure 4 2 Figure 4 3 Figure 4 4 Figure 4 5 O National Instruments Corporation xi Contents 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 cooooncccnoccccoconononacnnonconancnnccnnoss 2 8 Switch Configurations for Differential Mode or Single Ended Mode 2 10 W1 Ground Reference Jumper visiescjssecscssdcndsscccescdaesecceesnscasenaseedaaasestactedenccavanees 2 10 BNC 2080 Switch Configurations for an MIO 16 Configured in DIFF Mode Factory Default Setting oooooonnoonnoscronecnnonocnrrccnnccconoccnonocos os 2 11 BNC 2080 Switch Configurations for an MIO 16 Configured in RSE and NRSE Modest 2 12 Bias Return Resistor for DC Coupled Floating Source on Channel 1 DIE Mode ias 2 14 Normalized Frequency Response of Lowpass Filter ooonononinnnnonnnnocnnncncnnncnnss 2 16 Lowpass Filter on Differential Channel 1 ooonoconnnococinocaconaccnnonccononcnonnnccnonnnnnns 2 17 Normalized Frequency Response of Highpass Filter eee eeeeeeeseeeeeeees 2 18 Highpass Filter on Differential Channel 1 0 eee esse eseceeeeeeeeeeneeeaeenes 2 19 Attenuator for Use with Differential Inputs oooococnnnconnnocccononccononcconnnacnnnnac ns 2 21 Switch Configurations for SE Mode PC LPM 16 0 eee eeecceeeseeeesteeeetneeeenes 2 22
44. ition 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 AT MIO 16 AT MIO 16D AT MIO 16F 5 AT MIO 16X MC MIO 16 NB MIO 16 NB MIO 16X PC LPM 16 QA APO H 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 result in damage to your external power supply the BNC 2080 the expansion board connected to the BNC 2080 and or your computer National Instruments is not liable for damages resulting from such connections Analog Input Each differential analog input has seven open positions for signal conditioning components Six of these positions are designated as resistors and one is designated as a capacitor The board is shipped with jumpers in two positions for each input The equivalent circuit of one input is shown in Figure 2 3 The board can be used when the MIO 16 board is configured for both 16 single ended inputs and 8 differential inputs For specific applications illustrating signal conditioning with both single ended and differential inputs refer to the section titled Application Notes later in this chapter National Instruments Corporation 2 3 BNC 208X Series User Manual BNC 2080 Board Chapter 2 Input Schematic for ACH1 DIFF mode AI
45. ition board NB MC Lab PC or AT Series by a 50 pin ribbon cable The AT MIO 16D requires an NB5 cable The Lab LC requires an 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 1 1 BNC 208X Series User Manual Introduction Chapter 1 Figure 1 1 BNC 2080 Board Directly Connected to an MIO 16 Board The BNC 208X Series boards can be mounted beside an SC 205X Series cable adapter board an SC 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 Figure 1 2 shows the BNC 208X SC 207X SC 206X and SC 205X Series boards connected to an MIO 16 board Figure 1 2 BNC 208X SC 207X SC 206X and SC 205X Series Boards Connected to an MIO 16 Board BNC 208X Series User Manual 12 O National Instruments Corporation Chapter 1 Introduction What Your Kit Should Contain There are three kit versions for each of the BNC 2080 and the BNC 2081 boards one kit contains a 0 5 m cable one kit
46. l Instruments Corporation Appendix 1 Fax Number 03 879 9179 0662 437010 19 02 757 03 11 45 7671 11 90 502 2930 1 48 14 24 14 089 714 60 35 02 48301915 03 3788 1923 95 800 010 0793 03480 30673 32 848600 2265887 91 640 0533 08 730 43 70 056 20 51 55 02 737 4644 0635 523154 BNC 208X Series User Manual 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 Completing this form accurately before contacting 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 Name Company Address Fax Phone Computer brand Model Processor Operating system Speed MHz RAM MB Display adapter Mouse yes no Other adapters installed Hard disk capacity MB Brand Instruments used National Instruments hardware product model Revision Configuration National Instruments software product Version Configuration The problem is List any error messages The following steps will reproduce the problem Documentation Comm
47. nes the other Picking the capacitor first and letting its value determine the resistance required is preferable because more standard resistor values are available The filter circuit has one series capacitor on each input of the differential channel Because the two capacitors are in series the capacitance value that must be substituted into Formula 2 2 is the series capacitance of the two capacitors in series For two capacitors in series the net capacitance is the reciprocal of the sum of the reciprocals of the two capacitances For example two 0 001 uF capacitors in series have a net capacitance of 0 0005 uF The two capacitors should be the same value or the CMRR is degraded If capacitors of 0 001 uF are available the resistance is by substitution into Formula 2 2 6 366 Q or about 6 4 kQ Therefore in this example the input channel has a 6 37 kQ resistor or the closest standard value in its capacitor position G The closest standard 5 tolerance resistors are 6 2 kQ The closest standard 1 resistors are 6 34 kQ Figure 2 15 shows both the schematic and the component placement for a 50 kHz highpass filter placed on differential input Channel 1 If the input signal source is floating a bias return resistor must be placed in the D position R 5 in this case Note Highpass filters generally exhibit poorer common mode rejection characteristics than lowpass filters because capacitors are in the series input paths Capacitors have poorer tol
48. nnections A A A SEEE oas 2 3 ADAL PU A E nae hea des A 2 3 A a a E E E E E A S iS 2 5 Fu se and Power LED ui id ii decal dae 2 6 Disital and Timing SIO MAIS ii ateos tins is iaa 2 6 Specifications dina inde 2 6 A A a T 2 6 Power Requirements 2 7 PHYSIC All atodos oi 2 7 Operatina LOTO in da 2 7 Storage En IOMA it 2 7 Board 10 8 Gard Cab ido acess 2 7 NOTAS hit A A A A A AA 2 9 Application NS irc 2 9 Soldering and Desoldering on the BNC 2080 Board oooonoccnncccnocncooncnoncnannnnnnnon 2 9 Chanel CORTS UratOnS ari 2 9 MIO 16 Analog Input o 5icacsscccsasves sdaceisusscnesshedaasasvenaatoundscdeanedeaneacesdaceanss 2 9 Connecting Nonreferenced or Floating Signal Sources coooooccnnoccccnocccnnnncnnnnos 2 13 Differential Inputs iv inicias 2 13 Smele Endesa id E ers 2 14 Connecting Ground Referenced Signal SOULCES ooooccnoccnoccconcnonancnonanoncnann nina non 2 15 Differential inputs iii ia oidos 2 15 Single Ended Inputs ivonne reed 2 15 Building owpass Finers dis 2 15 Building ish pass Bute sic 4 320 ascccenss vesdadcaecaes odos 2 17 Building Attenuators Voltage Dividers oonoconccnnnnnnocononnnnoncnnanconncnonccnnnnnnn non 2 20 PE ea 2 22 MIO 10 A alog Output it id 2 23 Chapter 3 BNE 208 Board a a o do 3 1 A dia 3 2 Shield Ground spain de ede ates ESA EKSE ed ES EEE a E Es ae 3 4 Riise and POWErE Dd i a ett 3 5 Digital and Timing Signals o s 2css ssaccees inisiasi nni ai u ea cos secede debian ono shine 3 5 Na
49. noncncnnnnanonncnnnnnos 4 5 BNC 208X Series Board Connection 3 2 92aeencoadedenisnen tanga Aes 4 6 Signal COME dci 4 7 Ribbon Cable Connectors ea a do da 4 7 Rack Mount Chassis Cover AttachMent ooooonocccnnococonncccononcnononccnnnnccnnnnncnnnnccnnnos 4 7 Appendix Customer CommMunication 0 0 0ccccccccssssseseseseseseseseseseseseseseseseseseseseseseseeseseeeeeees A 1 QA net eee eee TE Index 1 Figures Figure 1 1 BNC 2080 Board Directly Connected to an MIO 16 Board ee eeeeeees 1 2 Figure 1 2 BNC 208X SC 207X SC 206X and SC 205X Series Boards Connected to an MIO 16 Board asilos 1 2 Figure 2 1 BNC 2080 Analog Breakout Board ooooonncccnnncccnoncccnnnccconnnncnnnnnononcnonancnonncnnnns 2 1 Figure 2 2 BNC 2080 Board Parts Locator DiagraM ooonocccnoncccnoncccnnncnononcnononaconnncnonnneninns 2 2 Figure 2 3 Onboard Equivalent Circuit for DIFF Mode ccccoocccconcccnonacncnonccononcnonancnnnnncnonnos 2 4 Figure 2 4 W2 Jumper Settit venido soceaanncestancastaned RAE E a 2 5 Figure 2 5 Direct Connection between an MIO 16 Board and the BNC 2080 Board 2 8 BNC 208X Series User Manual x National Instruments Corporation Figure 2 6 Figure 2 7 Figure 2 8 Figure 2 9 Figure 2 10 Figure 2 11 Figure 2 12 Figure 2 13 Figure 2 14 Figure 2 15 Figure 2 16 Figure 2 17 Figure 2 18 Figure 2 19 Figure 3 1 Figure 3 2 Figure 3 3 Figure 3 4 Figure 3 5 Figure 3 6 Figure 3 7 Figure 3 8 F
50. nput Multiplexer R15 100 kQ Channel 9 di in Case Figure 2 11 Bias Return Resistor for DC Coupled Floating Source on Channel 1 in DIFF Mode Single Ended Inputs When measuring floating signal sources the MIO 16 board should be configured 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 ground Therefore the BNC 2080 board should be used in its factory configuration In the factory configuration jumpers are in the two series positions E and F see Table 2 2 In this configuration all of the signal grounds should be tied to 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 BNC 208X Series User Manual 2 14 O National Instruments Corporation Chapter 2 BNC 2080 Board Connecting Ground Referenced Signal Sources A grounded signal source is connected in some way to the building system ground therefore the signal source is already connected to a common ground point with respect to the data acquisition board assuming the host computer is plugged into the same power system The nonisolated outputs of instruments and devices that plug into the building power system
51. on the BNC 2080 or jumper on the BNC 2081 must be in place 2 Check that jumpers W1 and W2 on the BNC 2080 and jumper W1 on the BNC 2081 are set correctly for the current application 3 Mount the BNC 208X Series board into a 19 in rack optional 4 Connect the BNC 208X Series board to the data acquisition board using a 50 pin ribbon cable If an SC 205X Series board or SC 207X Series board is used with the BNC 208X Series board install and mount the SC 205X Series and SC 207X Series boards as instructed in the SC 205X Series User Manual and the SC 207X Series User Manual Then connect the SC 207X Series board and the SC 205X Series board to the BNC 208X Series board using the 50 pin cable Connect the BNC 208X Series board to the data acquisition board 5 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 4 BNC 208X Series User Manual Installation and Connections Chapter 4 6 Attach the appropriate cover to the rack mount optional 7 Turn the computer on 8 When finished turn off any powered external signals to the BNC 208X Series board before turning off the computer Warning The BNC 208X Series boards have not been designed for use with high voltage Although the open component positions are configured so that voltage dividers can be installed to reduce a high input voltage to within the 10 V da
52. 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 ended channels In the single ended mode all 16 BNC connectors are in use In the single ended mode all 16 BNC cases are tied to the COMMON signal The COMMON signal can be switched between AIGND and AISENSE through jumper W1 See Figure 2 8 AISENSE is tied to COMMON for NRSE mode configuration and AIGND is tied to COMMON for RSE mode configuration Wi AISENSE COMMON AIGND 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 BNC 2080 Board Chapter 2 20800199 S N SANAL WY OO aoe pos Co co SOS Ey o o EBER o o OO O O as soks BNC g gt 4 a o 8 vt a O o o o 1 10 Stu 3H o at ome MORRARAMASOO88 BNC 208X Series User Manual Factory Default Setting 2 11 Figure 2 9 BNC 2080 Switch Configurations for an MIO 16 Configured in DIFF Mode O National Instruments Corporation BNC 2080 Board Chapter 2 y Ss aa AISENSE COMMON HE A o LS OO tr No REF SE ALGND COMMON AISENSE COMMON gt 7 NON RE
53. per is inserted in the C position of the input network 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 later in this chapter Shield Ground Jumper W1 is used to connect digital ground DGND to a grounded metal case This option is useful only if the 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 3 4 National Instruments Corporation Chapter 3 BNC 2081 Board Fuse and Power LED The 5 V line from the data acquisition board is protected by a 750 mA fuse If the red power LED does not light when the data acquisition board is powered on check the 750 mA fuse on the BNC 2081 board and the output fuse 1f any on the Lab data acquisition board Information on power connection is given in Chapter 4 Installation and Connections Digital and Timing Signals All of the signals from the Lab data acquisition board are made available either by BNC connectors or via solder holes on the BNC 2081 board Because these signals are not conditioned or changed in any way by this board refer to your Lab board user manual for information on the use of these signals If you
54. r 3 Mounting The BNC 2081 board is equipped with metal standoffs so the board can be placed on a workbench near the host computer You can use an optional rack mount chassis which can be fitted with a flat acrylic plastic cover When the BNC 2081 board is mounted in the chassis the board can be grounded to its metal standoffs and therefore to the rack For more information see Chapter 4 Installation and Connections Application Notes The open component positions on the BNC 2081 board make adding signal conditioning components to the analog input signals easier Several applications are covered in this section including filtering and attenuation The figures in this section give examples on a specific input channel If you want to install the circuit on a different channel consult Table 3 1 to determine the equivalent component positions for the other channels Soldering and Desoldering on the BNC 2081 Board With the applications discussed here you must make modifications to the printed circuit board usually by removing jumpers and adding components The BNC 2081 board is shipped with one jumper in the C position see Table 3 1 and Figure 3 3 Use a low wattage soldering iron 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 should be used Acid core solder damages the printed circuit
55. rd is configured for single ended inputs attenuators must be built on a separate breadboard 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 2080 board is not designed for any input voltages greater than 42 V even if a user installed voltage divider reduces the voltage to within the input range of the data 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 hazard for the operator National Instruments is not liable for damage or injury resulting from such misuse A three resistor circuit for attenuating voltages at the differential inputs of the BNC 2080 board is shown in Figure 2 16 The figure also shows the placement of the resistors on the open component positions for differential Channel 1 The gain G of this attenuator is given by the following formula RG G Re RE RG Formula 2 3 Therefore the input to the MIO 16 board Vo is as follows Vmio Vsc G where Vsc is the voltage applied to the BNC connectors of the BNC 2080 The accuracy of this gain equation depends on the tolerances of the resistors used Note Due to space constraints when a resistor is to be inserted in position G capacitor position it must be inserted vertically before bending the other lead to the board
56. s an analog breakout board that makes it easy to connect to all Lab data acquisition board analog signals a few digital signals and two user defined connectors via BNC type connectors Analog input signal conditioning can be added such as filters and dividers All other Lab signals can be accessed by solder holes in the board located next to the Lab input connectors In addition there is a connector to provide access to all digital 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 Figure 3 1 shows the BNC 2081 board Figure 3 1 BNC 2081 Analog Breakout Board The BNC 2081 board has BNC connectors for eight single ended input channels Open component positions at each analog input facilitate the addition of user selected signal conditioning With open component positions in the input paths you can insert user supplied resistors and capacitors for conditioning the eight single ended analog input signals National Instruments Corporation 3 1 BNC 208X Series User Manual BNC 2081 Board Chapter 3 Figure 3 2 illustrates the parts locator diagram for the BNC 2081 board 50 Pin 1 0 Connectors Digital 1 0 Connector Solder Holes Sl for Remaining cara au Oa BNC 2081 DRIL EXTUPY gt
57. stor values are available If a capacitance of 1 uF is available the resistance is by substitution into Formula 2 1 39 789 Q or about 39 8 kQ This resistance must be divided by two to get the resistor value on each input of a differential channel Therefore in this example each input has a 19 89 kQ resistor or the closest standard value in its series positions E and F The closest standard 5 tolerance resistors are 20 kQ The closest standard 0 5 resistors are 19 8 kQ 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 Figure 2 13 shows both the schematic and the component placement for a 4 Hz lowpass filter placed on differential input Channel 1 If the input signal source is floating a bias return resistor must be placed in the D position R 5 in this case The BNC 2080 board open component locations do not facilitate R C lowpass filters with the MIO 16 board configured for single ended inputs Therefore if the MIO 16 board is configured for single ended inputs lowpass filters must be built on the custom breadboard area BNC 208X Series User Manual 2 16 National Instruments Corporation Chapter 2 BNC 2080 Board A Channel 1 Channel 9 w 7 Y BNC Connector 19 8 kQ Resistor 1 uF Capacitor Input Schematic for ACH R3 19 8 KQ E Channel 1 in Center To Input Multiplexer
58. t be applied to the SC 207X Series inputs Warning The SC 206X Series boards must be completely enclosed if any onboard voltages or any voltages connected to the relays can exceed 42 V O National Instruments Corporation 4 7 BNC 208X Series User Manual Appendix 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 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 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 800 328 2203 512 794 5678 Branch Offices Phone Number Australia 03 879 9422 Austria 0662 435986 Belgium 02 757 00 20 Denmark 45 76 26 00 Finland 90 527 2321 France 1 48 14 24 00 Germany 089 741 31 30 Italy 02 48301892 Japan 03 3788 1921 Mexico 95 800 010 0793 Netherlands 03480 33466 Norway 32 848400 Singapore 2265886 Spain 91 640 0085 Sweden 08 730 49 70 Switzerland 056 20 51 51 Taiwan 02 377 1200 U K 0635 523545 Nationa
59. ta acquisition board input range the maximum safe input voltage at any point on the BNC 208X Series boards is 42 V peak Input voltages larger than 42 V even if attenuated by a voltage divider on the BNC 208X 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 Installing the SC 207X General Purpose Termination Breadboards Consult the SC 207X Series User Manual for instructions on the installation of your SC 207X Series board if any of these boards are being used Rack Mounting Your BNC 208X Series board can be installed on half of a 19 in rack mount chassis You can mount one BNC 208X Series board alongside an SC 205X Series cable adapter board an SC 206X Series digital signal conditioning board or an SC 207X Series general purpose termination breadboard You can mount your 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 Run the connecting 50
60. the host computer The maximum power consumption of the BNC 2081 board is a function of the signal conditioning components installed If the board is being powered from the host computer the maximum 5 V current is fuse limited to 750 mA Physical Board dimensions including standoffs 7 9 by 4 9 by 1 725 in T O connectors Three 50 pin 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 90 noncondensing Board to Board Cabling The BNC 2081 board directly connects to any of the data acquisition boards listed in Table 3 2 Table 3 2 Data Acquisition Boards Used with the BNC 2081 Board Lab Board PC XT and Macintosh NuBus BNC 2081 Board Lab LC Lab NB Lab PC Lab PC 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 3 6 National Instruments Corporation Chapter 3 BNC 2081 Board 50 Pin 1 O Connector N Lab Board l Hl BNC 2081 NB1 Lab PC Lab PC Lab NB or NB10 Lab LC cable Figure 3 5 Direct Connection between a Lab Board and the BNC 2081 Board For digital signal conditioning with the National Instruments SC 206X Series boards the SC 2053 cable adapter
61. tional Instruments Corporation ix BNC 208X Series User Manual Contents Sp cification S iia ad 3 5 Analog Mp t rios delas 3 5 Power Required ties 3 5 PIV SAC A A A O A sae Sted seas te 3 6 Operating Environment vsciicciesccasssvcsacives eiieeii e iE iiaa 3 6 Storage Environment ascese rine os E a E EE E EE E 3 6 IS Oar LOI DLO TKa R B o IT aT APAE E E E T 3 6 MEUS ad A A is 3 8 A A 3 8 Soldering and Desoldering on the BNC 2081 Board ooooonnccnnnccnocccooncnoncnannnonnnon 3 8 Connecting Nonreferenced or Floating Signal Sources ccocooccnnonccncocccnnnncnnnnos 3 8 Connecting Ground Referenced Signal SQUICES ooooconoccccocnnooncconcnonccnnnconn nono nonns 3 8 Building lowpass PI SE 3 9 Building Highpass FilterS incidir soiecasassceeins sbuathssetaacoasgededs oaceaatens ciaci n 3 11 Building Attenuators Voltage Dividers ooonococnnocccnnnccnonaccnnonnconanaconnnccnnnnccnnnos 3 12 Lab Board Analog Output unn either 3 14 Chapter 4 Installation and Connections 2000 00 00 ccc cece seseseseeseeeeseseseeseeeeseseseeneeeeeeaesneneeeeeeeeanenes 4 1 Hardware lost cs e reesi sess 4 1 Hardware Installation for the BNC 2080 and the BNC 208 1 0 0 0 eeeeeeeeee 4 1 Installing the SC 205X Series Cable Adapter Boards ocoooccnnoccccnoccconocccnonnccnnnos 4 2 Installing the SC 207X General Purpose Termination Breadboards 4 2 Rack MOURNE rias si s 4 2 External Power Connection If Necessary oococonococoonccononcnononcnc
62. tional Instruments will at its option repair or replace software media that do not execute programming instructions if National Instruments receives notice of such defects during the warranty period National Instruments does not warrant that the operation of the software shall be uninterrupted or error free A Return Material Authorization RMA number must be obtained from the factory and clearly marked on the outside of the package before any equipment will be accepted for warranty work National Instruments will pay the shipping costs of returning to the owner parts which are covered by warranty National Instruments believes that the information in this manual is accurate The document has been carefully reviewed for technical accuracy In the event that technical or typographical errors exist National Instruments reserves the right to make changes to subsequent editions of this document without prior notice to holders of this edition The reader should consult National Instruments if errors are suspected In no 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 WARRANTIES EXPRESS OR IMPLIED AND SPECIFICALLY DISCLAIMS ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE CUSTOMER S RIGHT TO RECOVER DAMAGES CAUSED BY FAULT OR NEGLIGENCE ON THE PART OF NATIONAL INSTRUMENTS SHALL BE LIMIT
63. to a common ground point with respect to the data acquisition board assuming the host computer is plugged into the same power system The nonisolated outputs of instruments and devices that plug into the building power system fall into this category In the case of grounded signal sources connected to the single ended inputs of the BNC 2081 board a small DC error can be measured because of differences between the ground potentials of the signal source and the Lab board This error is unavoidable with the BNC 2081 board because the Lab data acquisition board is configured only for RSE No special components are needed to measure signals from grounded sources connected to the BNC 2081 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 the 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 used Building Lowpass Filters Simple R C lowpass filters are easily installed in the BNC 2081 board on any input channel The filters are useful for accurate measurement and noise rejection By substituting resistance and capacitance values into the following formula hereafter referred to as Formula 3 1 you can calculate a simple one pole R C filter to have a 3 dB point fe
64. tors 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 for any input voltages greater than 42 V evenif a user installed voltage divider reduces the voltage to within the input range of the data acquisition board 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 BNC 208X Series User Manual 3 12 National Instruments Corporation Chapter 3 BNC 2081 Board A two resistor circuit for attenuating voltages at the single ended inputs of the BNC 2081 board is shown in Figure 3 11 The figure also shows the placement of the resistors on the open component positions for Channel 1 The gain G of this attenuator is given by the following formula Rp G Ro Rp Formula 3 3 Therefore the input to the Lab board V ap 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 used The input impedence of the channel with the voltage attenuator is Rc Rp This should be kept sufficiently high to avoid any loading effect on the voltage you are measuring Channel 1 Center
65. ts Corporation Chapter 3 BNC 2081 Board DACO OUT BNC Connector Jumpers Installed Here at Factory Figure 3 13 Analog Output Schematic for DACs DACO 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 Chapter 4 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 Hardware Installation for the BNC 2080 and the BNC 2081 The following are general instructions for installing your BNC 2080 or BNC 2081 board in your computer data acquisition system Consult the user manual or technical reference manual of your computer for specific instructions and warnings Notice that the installation instructions are the same for both BNC 2080 and the BNC 2081 boards Caution Turn the host computer off before making any connections 1 Determine 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 installed jumpers
66. ty BNC 2080 2 6 BNC 2081 3 5 signal connections BNC 2081 4 7 signal sources floating BNC 2080 2 13 BNC 2081 3 8 ground referenced 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 O National Instruments Corporation Index 5 Index BNC 208X Series User Manual Index switch configurations BNC 2080 MIO 16 in DIFF mode 2 11 MIO 16 in RSE 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 unpacking BNC 208X 1 5 V VDC vii voltage dividers See attenuators W W1 ground reference jumper 2 10 WI jumper settings 3 4 W2 jumper settings 2 5 BNC 208X Series User Manual Index 6 O National Instruments Corporation
67. 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 For more information on these products 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 Specifications This section lists the specifications of the BNC 2081 analog breakout board These ratings are typical at 25 C unless otherwise stated The operating temperature range for this board is 0 to 70 C Analog Input Number of channels Field connections Signal conditioning capability Other signals DIO connector Power Requirements Power consumption at 5 VDC 5 Typical Maximum National Instruments Corporation Eight single ended 15 BNC connectors Four open component positions per channel that include connections from the input to ground 5 V and a series connection to the input of the data acquisition board Solder holes for remaining Lab board I O signals DIO 24 connector for digital ports 12 mA with no user circuitry connected 750 mA from host computer BNC 208X Series User Manual BNC 2081 Board Chapter 3 Note The power specifications pertain to the power supply of

BNC-208X Series User Manual

Contents

Download Pdf Manuals

Related Search

Related Contents