BNC-2140 User Manual
Contents
1. Y7 NATIONAL IEPE POWER pe INSTRUMENTS BNC 2140 Connector Accessory ON OFF t Connectors A ANALOG INPUT AlO Al 2 SE DIFF SE DIFF ON M orr ON OFF IEPE POWER IEPE POWER Al 1 AI 3 SE SE DIFF ON ON OFF IEPE POWER IEPE POWER ANALOG OUTPUT 0 AO 1 SE DIFF SE DIFF Figure 2 1 Switch Settings and Signal Connections 2 2 ni com Signal Connections This chapter describes how to connect input and output signals to the BNC 2140 You can connect external analog signals through six BNC connectors Four of the BNC connectors are for input signals and two are for output signals The SHC68 C68 A1 shielded cable connects the BNC 2140 internal analog signal connector to the DSA plug in device A single 68 pin 0 8 mm VHDCI connector connects the analog I O signals to the shielded cable 1 0 Connectors Table 3 1 describes the pin assignments for the six external I O BNC connectors Table 3 1 BNC Analog 1 0 Connector Signal Descriptions Signal Name Reference Direction Description TAI lt 0 3 gt AI GND Input Analog Input Channel 0 through 3 Each channel can have IEPE enabled or disabled This signal passes through the BNC internal conductor lt 0 3 gt AI GND Input Analog Input Channel 0 through 3 In SE mode the2. bote iet e etd Appendix A Specifications Appendix B Technical Support and Professional Services National Instruments Corporation V BNC 2140 User Manual Contents Glossary Index BNC 2140 User Manual vi ni com About This Manual Conventions This manual describes the electrical and mechanical aspects of the BNC 2140 accessory and contains information concerning its operation lt gt bold italic monospace The following conventions are used in this manual Angle brackets containing numbers separated by an ellipsis represent a range of values associated with a bit or signal name for example lt 3 0 gt This icon denotes a note which alerts you to important information This icon denotes a caution which advises you of precautions to take to avoid injury data loss or a system crash Bold text denotes items that you must select or click in the software such as menu items and dialog box options Bold text also denotes parameter names Italic text denotes a variable emphasis a cross reference or an introduction to a key concept This font also denotes text that is a placeholder for a word or value that you must supply Text in this font denotes text or characters that you should enter from the keyboard sections of code programming examples and syntax examples This font is also used for the proper names of disk drives paths directories programs subprograms
3. E Note For UL and other safety certifications refer the the product label or to ni com Electromagnetic Compatibility Emissions eee en EN 55011 Class A at 10 m FCC Part 15A above 1 GHz IMMUNI i ueber netten etes EN 61326 1997 A2 2001 Table 1 EMC EMII eee CE C Tick and FCC Part 15 Class A Compliant iyi Note For EMC compliance you must operate this device with shielded cabling CE Compliance This product meets the essential requirements of applicable European Directives as amended for CE marking as follows Low Voltage Directive safety 73 23 EEC Electromagnetic Compatibility Directive sess 89 336 EEC hy Note Refer to the Declaration of Conformity DoC for this product for any additional regulatory compliance information To obtain the DoC for this product click Declarations of Conformity Information at ni com hardref nsf This Web site lists the DoCs by product family Select the appropriate product family followed by your product and a link to the DoC appears in Adobe Acrobat format Click the Acrobat icon to download or read the DoC National Instruments Corporation A 3 BNC 2140 User Manual Technical Support and Professional Services Visit the following sections of the National Instruments Web site at ni com for technical support and professional services National Instruments Corporation Support Online techni
4. 1 35 AIO AI GND 2 36 AlGND Al1 3 37 AI 1 AI GND 4 38 AI GND Al2 5 39 AI2 AI GND 6 40 AI GND AI3 7 41 AI GND 8 42 AI GND NC 9 43 NC NC 10 44 NC 11 45 NC NC 12 46 NC NC 13 47 NC NC 14 48 NC NC 15 49 NC NC 16 50 NC NC 17 51 NC NC 18 52 NC NC 19 53 NC NC 20 54 NC NC 21 55 NC NC 22 56 NC NC 23 57 NC NC 24 58 NC A00 25 59 AO GND 26 60 AO GND AO 1 27 61 1 AO GND 28 62 AO GND NC 29 63 NC NC 30 64 NC NC 31 65 NC NC 32 66 NC 5 33 67 45V 68 D GND gt These Al GND and AO GND pins not connected in the SHC68 C68 A1 cable National Instruments Corporation 3 3 Figure 3 1 BNC 2140 External 68 Pin Analog Connector BNC 2140 User Manual Chapter 3 Signal Connections 5 Note This BNC 2140 pin assignment maps to the pin assignment of DSA device you are connecting to the BNC 2140 Refer to the DSA device documentation for the pin assignments specific to your device connection Table 3 2 describes the signals for the internal 68 pin I O connector Table 3 2 68 Pin Analog 1 0 Connector Signal Descriptions Signal Name Reference Direction Description AI GND Analog Input Ground These pins are the reference point f
5. 2 Insert the other end into the 68 pin connector on the DSA plug in device Tighten the jackscrews on both ends of the cable 4 Power on the computer The BNC 2140 accessory is now installed Device Configuration You must manually configure the BNC 2140 accessory by setting the channel switches You can configure each input channel to enable or disable IEPE signal conditioning and to take differential or single ended measurements You also can configure each output channel for differential or single ended measurements When IEPE signal conditioning is enabled large DC offset voltages can occur on signal inputs due to the output bias voltage requirements of the IEPE transducer you are using To remove this offset you must enable AC coupling on the affected input channels of the DSA device If you do not require IEPE signal conditioning you can turn the power off for the IEPE signal conditioning circuitry Turning off the IEPE power will disable IEPE excitation on all input channels Refer to Figure 2 1 for the location of the switches National Instruments Corporation 2 1 BNC 2140 User Manual Chapter 2 Installation and Configuration Note You can connect disconnect BNC cables carrying signals without powering off the computer BNC 2140 User Manual
6. PRODUCTS ARE INCORPORATED IN A SYSTEM OR APPLICATION INCLUDING WITHOUT LIMITATION THE APPROPRIATE DESIGN PROCESS AND SAFETY LEVEL OF SUCH SYSTEM OR APPLICATION Compliance FCC Canada Radio Frequency Interference Compliance Determining FCC Class The Federal Communications Commission FCC has rules to protect wireless communications from interference The FCC places digital electronics into two classes These classes are known as Class A for use in industrial commercial locations only or Class B for use in residential or commercial locations All National Instruments NI products are FCC Class A products Depending on where it is operated this Class A product could be subject to restrictions in the FCC rules In Canada the Department of Communications DOC of Industry Canada regulates wireless interference in much the same way Digital electronics emit weak signals during normal operation that can affect radio television or other wireless products All Class A products display a simple warning statement of one paragraph in length regarding interference and undesired operation The FCC rules have restrictions regarding the locations where FCC Class A products can be operated Consult the FCC Web site at www fcc gov for more information FCC DOC Warnings This equipment generates and uses radio frequency energy and if not installed and used in strict accordance with the instructions in this manual and the CE marking Decl
7. both of which are isolated from computer ground whose difference is measured way you can configure your device to read signals in which you do not need to connect either input to a fixed reference such as the earth or a building ground Dynamic Signal Analysis the analysis of dynamically changing waveforms or systems using digital signal processing DSP techniques a high voltage low current discharge of static electricity that can damage sensitive electronic components farads a unit of capacitance signal sources with voltage signals that are not connected to an absolute reference or system ground also called nonreferenced signal sources common examples are batteries transformers or thermocouples See SE the physical components of a computer system such as the circuit boards plug in boards chassis enclosures peripherals and cables BNC 2140 User Manual Glossary IO IEPE in LED m microphone noise BNC 2140 User Manual input output the transfer of data to from a computer system involving communications channels operator interface devices and or data acquisition and control interfaces Integral Electronic Piezoelectric also known as integrated circuit piezoelectric identifies products that operate using a constant current source and return the output signal in the form of voltage modulation on the same line as the constant current source inches Light Emitting Diode a semiconducto
8. device take the following precautions Ground yourself with a grounding strap or by holding a grounded object Touch the plastic package to a metal part of your computer chassis before removing the device from the package Never touch exposed connector pins Remove the device from the package and inspect the device for loose components or any other sign of damage Notify National Instruments if the device appears damaged in any way Do not install a damaged device onto your computer 1 2 ni com Chapter 1 Introduction Optional Equipment If your application requires that you use transducers with microdot connectors use the BNC plug screw on receptacle adapter part number 033 0101 0001 from Microdot Connectors This accessory allows you to connect BNC and microdot connectors If your application requires that you use a prepolarized microphone with a microphone preamplifier contact Br el and Kjer or go to bksv com National Instruments Corporation 1 3 BNC 2140 User Manual Installation and Configuration This chapter explains how to install and configure the BNC 2140 Installation 0 Note You must power off the computer and install your National Instruments DSA device before installing the BNC 2140 Refer to your DSA device documentation for instructions Perform the following steps to install the BNC 2140 1 Insert either end of the SHC68 C68 A1 analog cable into the 68 pin connector on the BNC 2140
9. devices with floating grounds you may use the SE configuration and connect the floating ground system of the device to AO GND This reduces common mode noise coupled from an interfering source to the device UN Caution When configuring an analog output channel in the SE mode the voltage between AO GND and AO x must not exceed 7 07 Vp 5 Vms Voltage that exceeds this rating can damage the BNC 2140 the DSA plug in device and the computer National Instruments is not responsible for any damage resulting from connections that exceed this rating National Instruments Corporation 3 5 BNC 2140 User Manual Theory of Operation This chapter contains a functional overview of the BNC 2140 Functional Overview Figure 4 1 is a block diagram of the BNC 2140 68 Pin IEPE AI O IEPE Connector Isolated Power Supply On Off AIO fov pU LC AI 0 BNC 0 1 Connector T 10 IEPE Current 2 DIESE phone Source 0 e IEPE 3 IEPE Isolated Power Supply On Off Al zt TM pU EH Al 3 BNC 3 1 T Al3 500 FEE aa ee ource AO 04 AO 0 BNC Connector 4 AO 0 500 o ND DIFF SE 28 1 1 AO1 Sec AO GND DIFF SE 5 I ower On Off DOND Figure 4 1 BNC 2140 Block Diagram Nati
10. inverting differential signal In SE mode the outer shell is connected to ground 0 V through a 50 Q 1 W resistor The outer shell of the BNC is not directly connected to ground 0 V or the metal case of the BNC 2140 Analog Input Signal Connections The analog input signals for the BNC 2140 device are AI lt 0 3 gt and AI lt 0 3 gt How you connect analog input signals to the BNC 2140 depends on the configuration of the input signal sources For most signals use a DIFF configuration and connect the signal to AI x where xis the BNC 2140 channel and the signal ground or signal minus as appropriate to AI x If a signal has a high output impedance greater than 1 kQ and is floating you may use an SE configuration Single ended mode connects the negative side of the input signal to AI GND using 50 Q resistor This configuration reduces common mode interference Analog Output Signal Connections The BNC 2140 analog output signals are AO 0 AO 0 1 and AO 0 is the voltage output signal for analog output channel 0 1 is the voltage output signal for analog output channel 1 The connection of analog output signals from the BNC 2140 depends on the configuration of the devices receiving the signals For most signals use a DIFF configuration and connect AO x where x is the BNC 2140 channel to the signal and AO x to the signal ground or signal minus as appropriate When driving some
11. 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 LIMITED 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 malfu
12. signal common mode voltage coupling current excitation D D GND DC DC offset DIFF BNC 2140 User Manual analog output channel 1 signal analog output ground a DC signal added to the original signal a type of coaxial signal connector Celsius pin or wire lead to which you apply or from which you read the analog or digital signal analog signals can be single ended or differential an electronic amplifier sensitive to changes in the charge of a device typically used with piezoelectric accelerometers and capacitive transducers to condition the extremely high output impedance of the transducer to a low impedance voltage suitable for transmission over longer cables the mathematical average voltage relative to the computer s ground of the signals from a differential input any voltage present at the instrumentation amplifier inputs with respect to amplifier ground the manner in which a signal is connected from one location to another a source that supplies the current needed by a sensor for its proper operation digital ground signal direct current the DC voltage or current present on a signal differential mode G 2 ni com differential input differential measurement system DSA E electrostatic discharge F F floating signal sources G grounded measurement system H hardware National Instruments Corporation G 3 Glossary an analog input consisting of two terminals
13. subroutines device names functions operations variables filenames and extensions and code excerpts Related Documentation The following documents contain information you may find helpful e National Instruments Application Note 025 Field Wiring and Noise Considerations for Analog Signals e NI 4551 4552 User Manual 4451 4452 4453 4454 User Manual National Instruments Corporation Vii BNC 2140 User Manual Introduction This manual describes the electrical and mechanical aspects of the BNC 2140 accessory and contains information concerning its operation This chapter describes the BNC 2140 accessory lists what you need to get started explains how to unpack your BNC 2140 and describes optional equipment The BNC 2140 is a signal conditioning accessory specifically designed for use with a dynamic signal acquisition DSA device It interfaces four BNC signal inputs and two BNC signal outputs directly to National Instruments DSA products including the NI PCI 4451 NI PCI 4452 NI PCI 4551 and NI PCI 4552 The BNC 2140 connects to integrated circuit piezoelectric also known as Integral Electronic Piezoelectric IEPE accelerometers microphone preamplifiers and other voltage sources with outputs of less than 42 4 V Each input channel has an independent 4 mA current source suitable for use with IEPE type accelerometers and microphone preamplifiers You can manually enable or disable the IEPE signal condit
14. DAQ BNC 2140 User Manual Dynamic Signal Acquisition Signal Conditioning Accessory We NATIONAL June 2008 Edition y INSTRUMENTS Part Number 321933D 01 Worldwide Technical Support and Product Information ni com National Instruments Corporate Headquarters 11500 North Mopac Expressway Austin Texas 78759 3504 USA Tel 512 683 0100 Worldwide Offices Australia 1800 300 800 Austria 43 0 662 45 79 90 0 Belgium 32 0 2 757 00 20 Brazil 55 11 3262 3599 Canada Calgary 403 274 9391 Canada Montreal 514 288 5722 Canada Ottawa 613 233 5949 Canada Qu bec 514 694 8521 Canada Toronto 905 785 0085 Canada Vancouver 514 685 7530 China 86 21 6555 7838 Czech Republic 420 2 2423 5774 Denmark 45 45 76 26 00 Finland 385 0 9 725 725 11 France 33 0 1 48 14 24 24 Germany 49 0 89 741 31 30 Greece 30 2 10 42 96 427 India 91 80 51190000 Israel 972 0 3 6393737 Italy 39 02 413091 Japan 81 3 5472 2970 Korea 82 02 3451 3400 Malaysia 603 9131 0918 Mexico 001 800 010 0793 Netherlands 31 0 348 433 466 New Zealand 1800 300 800 Norway 47 0 66 90 76 60 Poland 48 0 22 3390 150 Portugal 351 210 311 210 Russia 7 095 238 7139 Singapore 65 6226 5886 Slovenia 386 3 425 4200 South Africa 27 0 11 805 8197 Spain 34 91 640 0085 Sweden 46 0 8 587 895 00 Switzerland 41 56 200 51 51 Taiwan 886 2 2528 7227 Thailand 662 992 7519 United Kingdom 44 0 1635 523545 For further support information refer to the Technical Support and Professional S
15. UT NOT LIMITED TO FLUCTUATIONS IN ELECTRICAL POWER SUPPLY COMPUTER HARDWARE MALFUNCTIONS COMPUTER OPERATING SYSTEM SOFTWARE FITNESS FITNESS OF COMPILERS AND DEVELOPMENT SOFTWARE USED TO DEVELOP AN APPLICATION INSTALLATION ERRORS SOFTWARE AND HARDWARE COMPATIBILITY PROBLEMS MALFUNCTIONS OR FAILURES OF ELECTRONIC MONITORING OR CONTROL DEVICES TRANSIENT FAILURES OF ELECTRONIC SYSTEMS HARDWARE AND OR SOFTWARE UNANTICIPATED USES OR MISUSES OR ERRORS ON THE PART OF THE USER OR APPLICATIONS DESIGNER ADVERSE FACTORS SUCH AS THESE ARE HEREAFTER COLLECTIVELY TERMED SYSTEM FAILURES ANY APPLICATION WHERE A SYSTEM FAILURE WOULD CREATE A RISK OF HARM TO PROPERTY OR PERSONS INCLUDING THE RISK OF BODILY INJURY AND DEATH SHOULD NOT BE RELIANT SOLELY UPON ONE FORM OF ELECTRONIC SYSTEM DUE TO THE RISK OF SYSTEM FAILURE TO AVOID DAMAGE INJURY OR DEATH THE USER OR APPLICATION DESIGNER MUST TAKE REASONABLY PRUDENT STEPS TO PROTECT AGAINST SYSTEM FAILURES INCLUDING BUT NOT LIMITED TO BACK UP OR SHUT DOWN MECHANISMS BECAUSE EACH END USER SYSTEM IS CUSTOMIZED AND DIFFERS FROM NATIONAL INSTRUMENTS TESTING PLATFORMS AND BECAUSE A USER OR APPLICATION DESIGNER MAY USE NATIONAL INSTRUMENTS PRODUCTS IN COMBINATION WITH OTHER PRODUCTS IN A MANNER NOT EVALUATED OR CONTEMPLATED BY NATIONAL INSTRUMENTS THE USER OR APPLICATION DESIGNER IS ULTIMATELY RESPONSIBLE FOR VERIFYING AND VALIDATING THE SUITABILITY OF NATIONAL INSTRUMENTS PRODUCTS WHENEVER NATIONAL INSTRUMENTS
16. aration of Conformity may cause interference to radio and television reception Classification requirements are the same for the Federal Communications Commission FCC and the Canadian Department of Communications DOC Changes or modifications not expressly approved by NI could void the user s authority to operate the equipment under the FCC Rules Class A Federal Communications Commission This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user is required to correct the interference at their own expense Canadian Department of Communications This Class A digital apparatus meets all requirements of the Canadian Interference Causing Equipment Regulations Cet appareil num rique de la classe A respecte toutes les exigences du R glement sur le mat riel brouilleur du Canada Compliance to EU Directives Readers in the European Union EU must refer to the manufacturer s Declaration of Conformity DoC for info
17. cal support resources include the following Self Help Resources For immediate answers and solutions visit our extensive library of technical support resources available in English Japanese and Spanish at ni com support These resources are available for most products at no cost to registered users and include software drivers and updates a KnowledgeBase product manuals step by step troubleshooting wizards conformity documentation example code tutorials and application notes instrument drivers discussion forums a measurement glossary and so on Assisted Support Options Contact NI engineers and other measurement and automation professionals by visiting ni com support Our online system helps you define your question and connects you to the experts by phone discussion forum or email Training Visit ni com training for self paced tutorials videos and interactive CDs You also can register for instructor led hands on courses at locations around the world System Integration If you have time constraints limited in house technical resources or other project challenges NI Alliance Program members can help To learn more call your local NI office or visit ni com alliance Declaration of Conformity DoC A DoC is our claim of compliance with the Council of the European Communities using the manufacturer s declaration of conformity This system affords the user protection for electronic compatibility EMC a
18. eat light sound pressure motion flow and so on and produces a corresponding electrical signal volts volts direct current volts rms BNC 2140 User Manual Index Numerics 5 V signal 68 pin connector signal descriptions table 3 4 A AI lt 0 3 gt signal 68 pin connector signal descriptions table 3 4 analog connector table 3 1 analog input signal connections 3 5 AI lt 0 3 gt signal 68 pin connector signal descriptions table 3 4 analog connector table 3 1 analog input signal connections 3 5 AI GND signal 68 pin connector signal descriptions table 3 4 analog input circuitry 4 2 signal connections 3 5 specifications A 1 current excitation A 1 voltage input A 1 analog output channels 4 2 signal connections 3 5 specifications A 2 0 signal 68 pin connector signal descriptions table 3 4 analog connector table 3 1 analog output signal connections 3 5 National Instruments Corporation AO 0 signal 68 pin connector signal descriptions table 3 4 analog connector table 3 1 analog output signal connections 3 5 1 signal 68 pin connector signal descriptions table 3 4 analog connector table 3 1 analog output signal connections 3 5 AO signal 68 pin connector signal descriptions table 3 4 analog connector table 3 1 analog output signal connections 3 5 AO GND signal 68 pin connector signal descriptions table 3 4 block d
19. ement A 2 safety A 3 support technical B 1 switch settings and signal connections figure 2 2 system integration services B 1 T technical support B 1 telephone technical support B 2 theory of operation analog input circuitry 4 2 analog output 4 2 block diagram of BNC 2140 4 1 functional overview 4 1 training customer B 1 troubleshooting resources B 1 BNC 2140 User Manual Index U unpacking the BNC 2140 1 2 V voltage input specifications A 1 BNC 2140 User Manual W Web professional services B 1 technical support B 1 worldwide technical support B 2 ni com
20. emperature coefficient 141 ppm C Voltage compliance 24 V Excitation overvoltage protection 42 4 Vp 30 Vms powered on or off Includes the effects of the BNC 2140 with a 1 m SHC68 C68 A1 analog cable National Instruments Corporation A 1 BNC 2140 User Manual Appendix A Specifications Analog Output Power Requirement from DSA device Physical Environment BNC 2140 User Manual Number of channels 2 Maximum voltage SE mode 7 07 Vp 5 Vims between AO GND and AO x Output coupling eene DC Power consumption 400 mA at 5 VDC Dimensions connectors I O signals DSA device connection Operating temperature Storage Relative humidity A 2 14 4 by 11 2 by 5 5 cm 5 7 by 4 4 by 2 2 in 6 BNC connectors outer shell isolated from the metal case 68 pin 0 8 mm VHDCI female connector 0 to 55 C 55 to 150 C 5 to 90 noncondensing ni com Safety Appendix A Specifications This product is designed to meet the requirements of the following standards of safety for electrical equipment for measurement control and laboratory use e 61010 1 EN 61010 1 e UL3111 1 UL 61010B 1 e CAN CSA C222 No 1010 1
21. ervices appendix To comment on the documentation send email to techpubs ni com 1998 2003 National Instruments Corporation All rights reserved Important Information Warranty The BNC 2140 is warranted against defects in materials and workmanship for a period of one year from the date of shipment as evidenced by receipts or other documentation National Instruments will at its option repair or replace equipment that proves to be defective during the warranty period This warranty includes parts and labor 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 National 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 document
22. iagram of BNC 2140 4 1 BNC 2140 block diagram 4 1 optional equipment 1 3 overview 1 1 requirements for getting started 1 2 unpacking 1 2 C calibration certificate B 2 configuration manual configuration 2 1 switch settings and signal connections figure 2 2 contacting National Instruments B 2 current excitation specifications A 1 BNC 2140 User Manual Index customer education B 1 professional services B 1 technical support B 1 D D GND signal 68 pin connector signal descriptions table 3 4 Declaration of Conformity B 1 diagnostic resources B 1 DIFF configuration analog input circuitry 4 2 analog input signal connections 3 5 analog output 4 2 analog output signal connections 3 5 setting 2 1 documentation conventions used in manual vii online library B 1 related documentation vii drivers instrument B 1 software B 1 dynamic signal acquisition devices 1 1 E environment specifications A 2 equipment optional 1 3 example code B 1 F frequently asked questions B 1 fuse self resetting table 3 4 BNC 2140 User Manual l 2 H help professional services B 1 technical support B 1 I O connectors 3 1 68 pin connector signal descriptions table 3 4 analog connector signal descriptions table 3 1 exceeding maximum ratings caution 3 4 pin connections figure 3 3 IEPE accelerometers and microphone preamplifiers 1 1 configuring 2 1 installation device conf
23. iguration 2 1 procedure 2 1 unpacking the BNC 2140 1 2 instrument drivers B 1 K KnowledgeBase B 1 manual See documentation ni com National Instruments calibration certificate B 2 customer education B 1 Declaration of Conformity B 1 professional services B 1 system integration services B 1 technical support B 1 worldwide offices B 2 0 online technical support B 1 operation of BNC 2140 See theory of operation optional equipment 1 3 P phone technical support B 2 physical specifications A 2 pin connections 68 pin analog connector figure 3 3 mapping to DSA device note 3 4 power requirement specifications A 2 professional services B 1 programming examples B 1 R requirements for getting started 1 2 S safety specifications A 3 SE configuration analog input circuitry 4 2 analog input signal connections 3 5 analog output 4 2 analog output signal connections 3 5 setting 2 1 National Instruments Corporation Index signal connections analog input 3 5 analog output 3 5 I O connectors 68 pin connector signal descriptions table 3 4 analog connector signal descriptions table 3 1 exceeding maximum ratings caution 3 4 pin connections figure 3 3 switch settings and signal connections figure 2 2 software drivers B 1 specifications analog input current excitation A 1 voltage input A 1 analog output A 2 environment A 2 physical A 2 power requir
24. inverting negative terminal is connected to ground through a 50 Q resistor This signal passes through the external BNC shell 0 0 Output Analog Output Channel 0 This pin supplies the analog non inverting output channel 0 This signal passes through the internal BNC conductor 0 0 Output Analog Output Channel 0 This pin supplies the analog inverting output channel 0 This signal passes through the external BNC shell In SE mode the inverting negative terminal is connected to ground through a 50 Q resistor National Instruments Corporation 3 1 BNC 2140 User Manual Chapter 3 Signal Connections Table 3 1 BNC Analog 1 0 Connector Signal Descriptions Continued Signal Name Reference Direction Description 1 1 Output Analog Output Channel 1 This pin supplies the analog non inverting output channel 1 This signal passes through the internal BNC conductor 1 1 Output Analog Output Channel 1 This pin supplies the analog inverting output channel 1 This signal passes through the external BNC shell In SE mode the inverting terminal is connected to ground through a 50 Q resistor Figure 3 1 illustrates the pin assignments on the BNC 2140 68 pin connector BNC 2140 User Manual 3 2 ni com Chapter 3 Signal Connections Alo
25. ioning on a per channel basis With IEPE disabled a BNC 2140 input channel acts as a direct voltage input You can manually switch each input channel and each output channel from differential DIFF to single ended SE mode In SE mode the BNC shell is connected to analog ground through a 50 Q resistor The BNC 2140 receives power for IEPE signal conditioning from the DSA plug in device through the 68 pin high density connector A green LED indicates when the IEPE circuitry is powered on When IEPE signal conditioning is not required you can manually power off the circuits National Instruments Corporation 1 1 BNC 2140 User Manual Chapter 1 Introduction What You Need to Get Started Unpacking To set up and use the BNC 2140 device you need the following BNC 2140 One of the following DSA devices and its documentation 4451 NIPCI 4452 NIPCI4551 NIPCI 4552 BNC 2140 User Manual Your computer SHC68 C68 A1 analog cable For more information refer to ni com appnotes nsf for the National Instruments Application Note 25 Field Wiring and Noise Considerations for Analog Signals The BNC 2140 is shipped in an antistatic plastic package to prevent electrostatic damage to the device Several components on the device can be damaged by electrostatic discharge N Caution Never touch the exposed pins of connectors BNC 2140 User Manual To avoid damage in handling the
26. n the incoming signal If IEPE is not required on any of the four input channels power off IEPE to de energize the circuitry Powering off IEPE removes noise induced by the circuitry on the incoming signal The BNC 2140 allows you to select between DIFF and SE input modes You can use IEPE signal conditioning when the inputs are in either mode BNC 2140 User Manual The BNC 2140 has two analog output channels The BNC 2140 can select between DIFF and SE outputs In DIFF mode the positive and negative sides of the output channel are floating Use DIFF mode when the unit under test has grounded input terminals In SE mode the negative side of the output channel is connected to AO GND with a 50 Q resistor 4 2 ni com Specifications This appendix lists the specifications of the BNC 2140 These specifications are typical at 25 C unless otherwise noted All specifications are relative to measurement standards and require a 15 minute warm up time Specifications do not include transducer error Analog Input Voltage Input Number of channels 4 Maximum input voltage Signal common mode voltage 42 4 Vp 30 Vims of AI GND Input coupling eset eens DC Input capacitance Current Excitation Input Mode On Off DIFF 85 pF 75 pF SE 150 pF 145 pF Current Excitation Level eate needs 4 mA ACCUFAGy cocto cete coasts 1 31 T
27. nctions 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 National Instruments NI and ni com are trademarks of National Instruments Corporation Patents For patents covering National Instruments products refer to the appropriate location Help Patents in your software the patents txt file on your CD or ni com patents WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS 1 NATIONAL INSTRUMENTS PRODUCTS ARE NOT DESIGNED WITH COMPONENTS AND TESTING FOR A LEVEL OF RELIABILITY SUITABLE FOR USE IN OR IN CONNECTION WITH SURGICAL IMPLANTS OR AS CRITICAL COMPONENTS IN ANY LIFE SUPPORT SYSTEMS WHOSE FAILURE TO PERFORM CAN REASONABLY BE EXPECTED TO CAUSE SIGNIFICANT INJURY TO A HUMAN 2 IN ANY APPLICATION INCLUDING THE ABOVE RELIABILITY OF OPERATION OF THE SOFTWARE PRODUCTS CAN BE IMPAIRED BY ADVERSE FACTORS INCLUDING B
28. nd product safety You can obtain the DoC for your product by visiting ni com hardref nsf B 1 BNC 2140 User Manual Appendix B Technical Support and Professional Services e Calibration Certificate If your product supports calibration you can obtain the calibration certificate for your product at ni com calibration If you searched ni com and could not find the answers you need contact your local office or NI corporate headquarters Phone numbers for our worldwide offices are listed at the front of this manual You also can visit the Worldwide Offices section of ni com niglobal to access the branch office Web sites which provide up to date contact information support phone numbers email addresses and current events BNC 2140 User Manual B 2 ni com Glossary Symbol Prefix Value p pico 10 2 milli 10 3 k kilo 103 M mega 106 Numbers Symbols percent positive of or plus negative of or minus per degree Q ohm 5 V 5 VDC source signal A A amperes AC alternating current AC coupled allowing the transmission of AC signals while blocking DC signals accelerometer a transducer for measuring the dynamic acceleration of a physical device AI analog input channel signal AO 0 analog output channel 0 signal National Instruments Corporation G 1 BNC 2140 User Manual Glossary AO 1 AO GND bias BNC C C channel charge amplifier common mode
29. onal Instruments Corporation 4 1 BNC 2140 User Manual Chapter 4 Theory of Operation Analog Input Circuitry Analog Output The BNC 2140 has four identical analog input channels The BNC 2140 supplies a constant current for accelerometers and microphone preamplifiers Many accelerometers use piezoelectric materials to generate a charge proportional to the acceleration applied These types of accelerometers are susceptible to external noise A charge amplifier is embedded within the sensor to reduce the effects of cable length noise and other spurious effects The BNC 2140 supplies the constant current required to power the embedded charge amplifier in the IEPE sensor so you can use inexpensive cables such as BNC cables Some manufacturers use signal conditioning to power their prepolarized microphones If your application requires a microphone preamplifier for use with a prepolarized microphone refer to the Optional Equipment section of Chapter 1 Introduction for supplier information If you attach an IEPE type of accelerometer or microphone preamplifier to an analog input channel you must turn on the IEPE power switch and enable the IEPE circuit for that channel to generate the required current The IEPE circuitry of any input channel can be enabled or disabled independently of any other input channel When IEPE is disabled the connection from the IEPE circuit to that channel breaks and has no effect o
30. or single ended measurements in SE mode and the bias current return point for differential measurements lt 0 3 gt AI GND Input Analog Input Channel 0 through 3 lt 0 3 gt AI GND Input Analog Input Channel 0 through 3 0 AO 0 Output Analog Output Channel 0 AO 0 0 Output Analog Output Channel 0 1 1 Output Analog Output Channel 1 1 1 Output Analog Output Channel 1 AO GND Analog Output Ground The analog output voltages are ultimately referenced to this node D GND Digital Ground This pin supplies the reference for the 5 VDC supply 5 D GND Output 5 VDC Source These pins are fused for up to 0 5 A of 5 V supply on the DSA plug in device The fuse is self resetting This source powers the IEPE circuits of the BNC 2140 Note For lt 0 3 gt AI lt 0 3 gt 0 AO 0 AO 1 and AO 1 descriptions refer to Table 3 1 UN Caution Connections that exceed the maximum ratings for input or output signals on the BNC 2140 accessory can damage the BNC 2140 any device connected to it and the host computer Maximum input ratings for each signal are listed in Appendix A Specifications National Instruments is not liable for any damage resulting from signal connections exceeding maximum ratings BNC 2140 User Manual 3 4 ni com Chapter 3 Signal Connections In DIFF mode the outer shell is the
31. r light source meters a transducer that converts acoustical waves into electrical signals an undesirable electrical signal comes from external sources such as the AC power line motors generators transformers fluorescent lights soldering irons CRT displays computers electrical storms welders radio transmitters and internal sources such as semiconductors resistors and capacitors corrupts signals you are trying to send or receive G 4 ni com PCI pF ppm rms SE signal conditioning T transducer VDC rms National Instruments Corporation G 5 Glossary Peripheral Component Interconnect a high performance expansion bus architecture originally developed by Intel to replace ISA and EISA offers a theoretical maximum transfer rate of 132 Mbytes s and is achieving widespread acceptance as a standard for PCs and work stations picofarad one trillionth of a farad parts per million root mean square the square root of the average value of the square of the instantaneous signal amplitude a measure of signal amplitude single ended a term used to describe an analog input that is measured with respect to a common ground the manipulation of signals to prepare them for digitizing electronic equipment that makes transducer or other signals suitable in level and range to be transmitted over a distance or to interface with voltage input instruments a device that responds to a physical stimulus h
32. rmation pertaining to the CE marking compliance scheme The manufacturer includes a DoC for most hardware products except for those bought from OEMs In addition DoCs are usually not provided if compliance is not required for example electrically benign apparatus or cables To obtain the DoC for this product click Declarations of Conformity Information at ni com hardref nst This Web site lists the DoCs by product family Select the appropriate product family followed by your product and a link to the DoC appears in Adobe Acrobat format Click the Acrobat icon to download or read the DoC The CE marking Declaration of Conformity contains important supplementary information and instructions for the user or installer Contents About This Manual CONVEMEONS Related Chapter 1 Introduction What You Need to Get Started sse Unpacking o ood eae Optional Equipment eese nnne Chapter 2 Installation and Configuration Installation en ERR Rats Device Configuration inte repe ee pete teens Chapter 3 Signal Connections Connectors eet erret ederet es Analog Input Signal Connections esee Analog Output Signal Connections ees Chapter 4 Theory of Operation Functional Overview ote ten ten re Re RIP Analog Input Circuitry eese Analog
Download Pdf Manuals
Related Search