National Instruments BNC-2140 Network Card User Manual
Contents
1. N INSTRUMENTS ea BNC 2140 D ON TII orr A Electrostatic Ata z C Made in USA ANALOG INPUT ACHO ACH2 SE DIFF SE DIFF gt gt ON lij OFF on TII orr ICP ENABLE ICP ENABLE ACHI ACH3 SE DIFF SE DIFF ON M OFF on TII orr ICP ENABLE ICP ENABLE ANALOG OUTPUT DACO OUT DACI OUT SE DIFF gt gt SE TIT DIFF Figure 2 1 Switch Settings and Signal Connections BNC 2140 User Manual 2 2 National Instruments Corporation Signal Connections This chapter describes how to connect input and output signals to your BNC 2140 You can connect the external analog signals through six BNC connectors Four BNC connectors are for input signals and two connectors 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 shows 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 ACH lt 0 3 gt AIGND Input Analog Input Channel 0 thro2. 68 Pin Connector ICP Enable ICP CHO on off Isolated Power Supply y AICHO 5 V 4 4 30 V LA EN 0 1 Connector V na AICHO oO NW AIGND ICP Current A Source 0 DIFF SE o e o e ICP Enable o ICP CH3 on off Isolated Power Supply y AICH3 5V 4 4 30 V LA Ee 3 1 Connector V 555 AICH3 o o AIGND ICP Current A Source 3 DIFF SE DACOOUT DACOOUT o BNC Connector 500 DACOOUT oO VW AOGND DIFF SE DAC10UT DAC10UT 5 Bae Connector 500 DAC10UT O O AAN AOGND DIFF SE 5 V bo 45 V ICP Power on off DGND Figure 4 1 BNC 2140 Block Diagram BNC 2140 User Manual 4 2 National Instruments Corporation Chapter 4 Theory of Operation Analog Input Circuitry The BNC 2140 has four identical analog input channels A principal function of the BNC 2140 is to supply a constant current for ICP type accelerometers and microphone preamplifiers Many accelerometers use piezoelectric materials to generate a charge that is proportional to the acceleration applied Although these types of accelerometers have certain advantages they are very suseptable to external noise ICP type sensor manufacturers embed a charge amplifier within the transducer to reduce the effect of cable length noise and other spurious effects The BNC 2140 supplies the constant current required to power that e
3. 3 1 Table 3 2 68 Pin Analog I O Connector Signal Descriptions 3 4 BNC 2140 User Manual vi National Instruments Corporation About This Manual This manual describes the electrical and mechanical aspects of the BNC 2140 accessory and contains information concerning its operation Organization of This Manual The BNC 2140 User Manual is organized as follows National Instruments Corporation Chapter 1 Introduction describes the BNC 2140 accessory lists what you need to get started explains how to unpack your BNC 2140 and describes optional equipment Chapter 2 Installation and Configuration explains how to install and configure your BNC 2140 accessory Chapter 3 Signal Connections describes how to make input and output signal connections to your BNC 2140 Chapter 4 Theory of Operation contains a functional overview of the BNC 2140 Appendix A Specifications lists the specifications of the BNC 2140 Appendix B Customer Communication contains forms you can use to request help from National Instruments or to comment on our products and manuals The Glossary contains an alphabetical list and description of terms used in this manual including abbreviations acronyms metric prefixes mnemonics and symbols The ndex contains an alphabetical list of key terms and topics in this manual including the page where you can find each one vii BNC 2140
4. A amperes AC alternating current AC coupled allowing the transmission of AC signals while blocking DC signals National Instruments Corporation G 1 BNC 2140 User Manual Glossary ACH A D ADC alias amplification amplitude flatness AOGND attenuate attenuation ratio bandwidth bipolar BNC BNC 2140 User Manual analog input channel signal analog to digital analog to digital converter an electronic device often an integrated circuit that converts an analog voltage to a digital number a false lower frequency component that appears in sampled data acquired at too low a sampling rate a type of signal conditioning that improves accuracy in the resulting digitized signal and reduces noise a measure of how close to constant the gain of a circuit remains over a range of frequencies analog output ground signal to decrease the amplitude of a signal the factor by which a signal s amplitude is decreased bit one binary digit either 0 or 1 byte eight related bits of data an eight bit binary number Also used to denote the amount of memory required to store one byte of data the range of frequencies present in a signal or the range of frequencies to which a measuring device can respond a signal range that includes both positive and negative values for example 5 V to 5 V a type of coaxial signal connector G 2 National Instruments Corporation C C channel CMRR common
5. the manner in which a signal is connected from one location to another an unwanted signal on one channel due to an input on a different channel the amount of current a digital or analog output channel is capable of sourcing or sinking while still operating within voltage range specifications the ability of a DAQ board to dissipate current for analog or digital output signals the ability of a DAQ board to supply current for analog or digital output signals BNC 2140 User Manual Glossary D A DAC DACOOUT DACIOUT dB DC DC coupled default setting delta sigma modulating ADC DGND DIFF differential input differential measurement system DIO BNC 2140 User Manual digital to analog digital to analog converter an electronic device often an integrated circuit that converts a digital number into a corresponding analog voltage or current analog channel 0 output signal analog channel loutput signal decibel the unit for expressing a logarithmic measure of the ratio of two signal levels dB 20log 1 V V gt for signals in volts direct current allowing the transmission of both AC and DC signals a default parameter value recorded in the driver In many cases the default input of a control is a certain value often 0 that means use the current default setting For example the default input for a parameter may be do not change current setting and the default setting may be no AMUX 64T boards If y
6. 3 4 power requirement specifications A 2 R requirements for getting started 1 2 S SE configuration analog input circuitry 4 3 analog input signal connections 3 5 analog output 4 4 analog output signal connections 3 5 setting 2 1 to 2 2 self resetting fuse table 3 4 O National Instruments Corporation signal connections 3 1 to 3 5 analog input 3 5 analog output 3 5 I O connectors 3 1 to 3 5 68 pin connector signal descriptions table 3 4 analog connector signal descriptions table 3 1 to 3 2 exceeding maximum ratings caution 3 4 to 3 5 pin connections figure 3 3 switch settings and signal connections figure 2 2 specifications A 1 to A 2 analog input A 1 to A 2 current excitation A 1 to A 2 voltage input A 1 analog output A 2 environment A 2 physical A 2 power requirements A 2 O National Instruments Corporation Index switch settings and signal connections figure 2 2 T technical support B 1 to B 2 telephone and fax support numbers B 2 theory of operation 4 1 to 4 4 analog input circuitry 4 3 analog output 4 4 block diagram of BNC 2140 4 2 functional overview 4 2 U unpacking the BNC 2140 1 2 V voltage input specifications A 1 BNC 2140 User Manual
7. User Manual About This Manual Conventions Used in This Manual lt gt AN bold italic italic SE 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 D10 lt 3 0 gt This icon to the left of bold italicized text denotes a note which alerts you to important information This icon to the left of bold italicized text denotes a caution which advises you of precautions to take to avoid injury data loss or a system crash Bold italic text denotes a note or caution Italic text denotes a variable emphasis a cross reference or an introduction to a key concept SE means referenced single ended RSE Related Documentation The following documents contain information you may find helpful National Instruments Application Note 025 Field Wiring and Noise Considerations for Analog Signals e PCI 4451 4452 User Manual NI 4551 4552 User Manual Customer Communication BNC 2140 User Manual 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 Appendix B Customer Communication at the e
8. for the 68 pin connector Connections that exceed any of the maximum ratings of input or output signals on the BNC 2140 accessory can damage not only the BNC 2140 but also the DSA plug in device and the computer as well Maximum input ratings for each signal are given in Appendix A Specifications National Instruments is not liable for any damages resulting from signal connections exceeding maximum ratings BNC 2140 User Manual 3 4 National Instruments Corporation Chapter 3 Signal Connections The outer shell of the BNC connectors is not GND 0 V The outer shell of the BNC is not physically connected to the metal box of the BNC 2140 The outer shell is either the inverting differential signal in DIFF mode or is tethered to GND 0 V through a 50 Q 1 W resistor in SE mode Analog Input Signal Connections The analog input signals for the BNC 2140 device are ACH lt 0 3 gt and ACH lt 0 3 gt Connecting of analog input signals to your BNC 2140 accessory depends on the configuration of the input signal sources For most signals you use a DIFF configuration and simply connect the signal to ACHx where x is the BNC 2140 channel and the signal ground or signal minus as appropriate to ACHx If a signal has a high output impedance greater than kQ and is floating you may find it useful to use an SE configuration that tethers the signal minus to AIGND This reduces common mode interference Analog Output Signal Con
9. 14 kHz sine wave and a 15 kHz sine wave added in a 1 1 amplitude ratio inches integral nonlinearity a measure in LSB of the worst case deviation from the ideal A D or D A transfer characteristic of the analog I O circuitry the current that flows into the inputs of a circuit the measured resistance and capacitance between the input terminals of a circuit the difference in the input bias currents of the two inputs of an instrumentation amplifier a circuit whose output voltage with respect to ground is proportional to the difference between the voltages at its two inputs input output the transfer of data to from a computer system involving communications channels operator interface devices and or data acquisition and control interfaces current output high current output low G 6 National Instruments Corporation kS L LabVIEW linearity linearization low frequency corner MSB MTBF MTTR National Instruments Corporation G 7 Glossary kilo the standard metric prefix for 1 000 or 10 used with units of measure such as volts hertz and meters kilo the prefix for 1 024 or 2 used with B in quantifying data or computer memory 1 000 samples laboratory virtual instrument engineering workbench the adherence of device response to the equation R KS where R response S stimulus and K a constant a type of signal conditioning in which software linearizes the voltage levels fro
10. 5 785 0085 514 694 8521 45 76 26 00 09 725 725 11 01 48 14 24 24 089 741 31 30 2645 3186 03 6120092 02 413091 03 5472 2970 02 596 7456 5 520 2635 0348 433466 32 84 84 00 2265886 91 640 0085 08 730 49 70 056 200 51 51 02 377 1200 01635 523545 512 795 8248 B 2 Fax 03 9879 6277 0662 45 79 90 19 02 757 03 11 011 288 8528 905 785 0086 514 694 4399 45 76 26 02 09 725 725 55 0148 142414 089 714 60 35 2686 8505 03 6120095 02 41309215 03 5472 2977 02 596 7455 5 520 3282 0348 430673 32 84 86 00 2265887 91 640 0533 08 730 43 70 056 200 51 55 02 737 4644 01635 523154 512 794 5678 National Instruments Corporation 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 include version number Clock speed MHz RAM MB Display adapter Mouse ___ yes no Other adapters installed Hard di
11. C68 A1 analog cable National Instruments Corporation A 1 BNC 2140 User Manual Appendix A Specifications Analog Output Temperature coefficient Voltage compliance Excitation overvoltage protection Number of channels Output coupling 0 eee eee cree Power Requirement from DSA board Physical Environment BNC 2140 User Manual Power consumption 00 00 aaa Dimensions 00 000 vana nana aaa T O connectors WO Signal sise seine DSA board connection Operating temperature Storage temperature Relative humidity A 2 141 ppm C 24 V 42 4 V 30 V ms powered on or off 2 see Caution under Analog Output Signal Connections in Chapter 3 Signal Connections DC 400 mA at 45 VDC 14 0 by 11 2 by 3 8 cm 6 0 by 4 4 by 1 6 in 6 BNC connectors outer shell isolated from box metal 68 pin 0 8 mm VHDCI female connector 0 to 40 C 55 to 150 C 5 to 90 non condensing National Instruments Corporation Customer Communication For your convenience this appendix contains forms to help you gather the information necessary to help us solve your technical problems and a form you can use to comment on the product documentation When you contact us we need th
12. DAQ BNC 2140 User Manual Dynamic Signal Acquisition Signal Conditioning Accessory K NATIONAL June 1998 Editi MN NsTRUMENTs Part Number 3219338 01 Internet Support E mail support natinst com FTP Site ftp natinst com Web Address http www natinst com Bulletin Board Support BBS United States 512 794 5422 BBS United Kingdom 01635 551422 BBS France 01 48 65 15 59 Fax on Demand Support 512 418 1111 Telephone Support USA Tel 512 795 8248 Fax 512 794 5678 International Offices Australia 03 9879 5166 Austria 0662 45 79 90 0 Belgium 02 757 00 20 Brazil 011 288 3336 Canada Ontario 905 785 0085 Canada Qu bec 514 694 8521 Denmark 45 76 26 00 Finland 09 725 725 11 France 01 48 14 24 24 Germany 089 741 31 30 Hong Kong 2645 3186 Israel 03 6120092 Italy 02 413091 Japan 03 5472 2970 Korea 02 596 7456 Mexico 5 520 2635 Netherlands 0348 433466 Norway 32 84 84 00 Singapore 2265886 Spain 91 640 0085 Sweden 08 730 49 70 Switzerland 056 200 51 51 Taiwan 02 377 1200 United Kingdom 01635 523545 National Instruments Corporate Headguarters 6504 Bridge Point Parkway Austin Texas 78730 5039 USA Tel 512 794 0100 Copyright 1998 National Instruments Corporation All rights reserved Important Information Warranty Copyright Trademarks 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 oth
13. ICP signal conditioning you can manually turn off the power to 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 your BNC 2140 device you will need the following Q Q BNC 2140 One of the following DSA devices PCI 4451 PCI 4452 NI 4551 NI 4552 BNC 2140 User Manual Your computer SHC68 C68 A1 analog cable Your 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 To avoid such damage in handling the device take the following precautions Ground yourself via 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 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 Never touch the exposed pins of connectors Optional Equipment BNC 2140 User Manual If your application requires that you use transducers with microdot connectors use the BNC plug screw on receptacle part number 033 0101 0001 from Microdot Connector Company This accessory allows you to conect BNC and microdot connectors 1 2 National In
14. 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 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 ICP is a registered trademark of PCB Piezotronics Inc Product and company names listed are trademarks or trade names of their respective companies WARNING REGARDING MEDICAL AND CLINICAL USE OF NATIONAL INSTRUMENTS PRODUCTS National Instruments products are no
15. ame instant samples per second used to express the rate at which a DAQ board samples an analog signal a measure of the amount of noise seen by an analog circuit or an ADC when the analog inputs are grounded total harmonic distortion the ratio of the total rms signal due to harmonic distortion to the overall rms signal in decibel or a percentage signal to THD plus noise the ratio in decibels of the overall rms signal to the rms signal of harmonic distortion plus noise introduced See sensor a type of signal conditioning that uses external voltages and currents to excite the circuitry of a signal conditioning system into measuring physical phenomena a signal range that is always positive for example 0 to 10 V the number of output updates per second G 10 National Instruments Corporation Glossary V volts Voc volts direct current Vin volts input high Vit volts input low V volts in Vou volts output high Var volts output low V ief reference voltage waveform multiple voltage readings taken at a specific sampling rate working voltage the highest voltage that should be applied to a product in normal use normally well under the breakdown voltage for safety margin National Instruments Corporation G 11 BNC 2140 User Manual Index Numbers 5 V signal 68 pin connector signal descriptions table 3 4 A ACH lt 0 3 gt signal 68 pin connector signal descriptions table 3 4 analog conne
16. bling vise isti eine Se peko deep teti VE AE A a ed lesi 1 3 Chapter 2 Installation and Configuration UNS tal At OM asss ccsncvecuevvevervensctteaseoescvenddedlsagdesevecoescenigesstes cadedveuversdesteduenten ede Rectan edatentizests 2 1 Device Configuration o ie o o i RE E nail 2 1 Chapter 3 Signal Connections VO Connectors ea ek vii ai ribi LA A i A ee 3 1 Analog Input Signal Connections 00 vao a 3 5 Analog Output Signal Connections 2 0 0 0 ce ene 3 5 Chapter 4 Theory of Operation Functional Overview dna sven eet a s AUS A INA aii eee 4 2 Analog Input Circuitry esene Sevno dro bear vo oni na vako odtok 4 3 Analog Outputs cic tva sd poeta i si lie 4 4 Appendix A Specifications Analog Input sirak ipo Hone a rolada a A 1 Voltage Input es i cn cated wien tte BEE e S A 1 Current Excitation s s rierien eeri a ko A 1 Analog Output ores zas Le ee Roloc oo as Oa es ed A e Riki A 2 National Instruments Corporation v BNC 2140 User Manual Contents Power Requirement from DSA board A 2 PHYSICA nn a e e A 2 Fnvirotiment s Ges a nain e eA es A 2 Appendix B Customer Communication Glossary Index Figures Figure 2 1 Switch Settings and Signal Connections ooo 2 2 Figure 3 1 BNC 2140 External 68 Pin Analog Connector 3 3 Figure 4 1 BNC 2140 Block Diagram ena 4 2 Tables Table 3 1 BNC Analog I O Connector Signal Descriptions
17. cted to an absolute reference or system ground Also called nonreferenced signal sources Some common example of floating signal sources are batteries transformers or thermocouples the factor by which a signal is amplified sometimes expressed in decibels a measure of deviation of the gain of an amplifier from the ideal gain level of random vibration See SE hour the physical components of a computer system such as the circuit boards plug in boards chassis enclosures peripherals and cables hexadecimal hertz cycles per second Specifically refers to the repetition frequency of a waveform BNC 2140 User Manual Glossary IC ICP IMD in INL input bias current input impedance input offset current instrumentation amplifier I O BNC 2140 User Manual integrated circuit Integrated Circuit Piezoelectric identifies products that operate using a constant current source and returns the output signal in the form of voltage modulation on the same line as the constant current source intermodulation distortion the ratio in dB of the total rms signal level of harmonic sum and difference distortion products to the overall rms signal level The test signal is two sine waves added together according to the following standards SMPTE A 60 Hz sine wave and a 7 kHz sine wave added in a 4 1 amplitude ratio DIN A 250 Hz sine wave and an 8 kHz sine wave added in a 4 1 amplitude ratio CCIF A
18. ctor table 3 1 analog input signal connections 3 5 ACH lt 0 3 gt signal 68 pin connector signal descriptions table 3 4 analog connector table 3 1 analog input signal connections 3 5 AIGND signal 68 pin connector signal descriptions table 3 4 analog input circuitry 4 3 signal connections 3 5 specifications A 1 to A 2 current excitation A 1 to A 2 voltage input A 1 analog output channels 4 4 signal connections 3 5 specifications A 2 AOGND signal 68 pin connector signal descriptions table 3 4 block diagram of BNC 2140 4 2 BNC 2140 block diagram 4 2 custom cabling 1 3 National Instruments Corporation optional equipment 1 2 to 1 3 overview 1 1 requirements for getting started 1 2 unpacking 1 2 bulletin board support B 1 C cabling custom 1 3 configuration manual configuration 2 1 switch settings and signal connections figure 2 2 current excitation specifications A 1 to A 2 custom cabling 1 3 customer communication viii B 1 to B 2 D DACOOUT signal 68 pin connector signal descriptions table 3 4 analog connector table 3 1 analog output signal connections 3 5 DACOOUT signal 68 pin connector signal descriptions table 3 4 analog connector table 3 1 analog output signal connections 3 5 4DACIOUT signal 68 pin connector signal descriptions table 3 4 analog connector table 3 2 analog output signal connections 3 5 DACIOUT signal 68 pin conn
19. e information on the Technical Support Form and the configuration form if your manual contains one about your system configuration to answer your questions as quickly as possible National Instruments has technical assistance through electronic fax and telephone systems to quickly provide the information you need Our electronic services include a bulletin board service an FTP site a fax on demand system and e mail support If you have a hardware or software problem first try the electronic support systems If the information available on these systems does not answer your questions we offer fax and telephone support through our technical support centers which are staffed by applications engineers Electronic Services Bulletin Board Support National Instruments has BBS and FTP sites dedicated for 24 hour support with a collection of files and documents to answer most common customer questions From these sites you can also download the latest instrument drivers updates and example programs For recorded instructions on how to use the bulletin board and FTP services and for BBS automated information call 512 795 6990 You can access these services at United States 512 794 5422 Up to 14 400 baud 8 data bits 1 stop bit no parity United Kingdom 01635 551422 Up to 9 600 baud 8 data bits 1 stop bit no parity France 01 48 65 15 59 Up to 9 600 baud 8 data bits 1 stop bit no parity FTP Support To access our FTP site log on t
20. ector signal descriptions table 3 4 analog connector table 3 2 BNC 2140 User Manual Index analog output signal connections 3 5 DGND signal 68 pin connector signal descriptions table 3 4 DIFF configuration analog input circuitry 4 3 analog input signal connections 3 5 analog output 4 4 analog output signal connections 3 5 setting 2 1 to 2 2 documentation conventions used in the manual viii organization of manual vii related documentation viii dynamic signal acquisition boards 1 1 E electronic support services B 1 to B 2 e mail support B 2 environment specifications A 2 equipment optional 1 2 to 1 3 F fax and telephone support numbers B 2 Fax on Demand support B 2 FTP support B 1 fuse self resetting table 3 4 ICP accelerometers and microphone preamplifiers 1 1 4 3 configuring 2 1 to 2 2 signal conditioning 1 1 4 3 installation device configuration 2 1 to 2 2 procedure 2 1 unpacking the BNC 2140 1 2 BNC 2140 User Manual l 2 I O connectors 3 1 to 3 5 68 pin connector signal descriptions table 3 4 analog connector signal descriptions table 3 1 to 3 2 exceeding maximum ratings caution 3 4 to 3 5 pin connections figure 3 3 manual See documentation 0 operation of BNC 2140 See theory of operation optional equipment 1 2 to 1 3 P physical specifications A 2 pin connections 68 pin analog connector figure 3 3 mapping to DSA device note
21. er 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 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 LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER NATIONAL INSTRUMENTS WILL NOT BE LIABLE FOR DAMAGES RESULTING FROM LOSS OF DATA
22. g to the BNC 2140 Refer to your DSA device user manual for the pin assignments specific to your device connection Table 3 2 shows the pin assignments for the internal 68 pin I O connector Table 3 2 68 Pin Analog 1 0 Connector Signal Descriptions Signal Name Reference Direction Description AIGND Analog Input Ground These pins are the reference point for single ended measurements in SE mode and the bias current return point for differential measurements ACH lt 0 3 gt AIGND Input Analog Input Channel 0 through 3 ACH lt 0 3 gt AIGND Input Analog Input Channel 0 through 3 DACOOUT DACOOUT Output Analog Output Channel 0 DACOOUT DACOOUT Output Analog Output Channel 0 4DACIOUT DACIOUT Output Analog Output Channel 1 DACIOUT DACIOUT Output Analog Output Channel 1 AOGND Analog Output Ground The analog output voltages are ultimately referenced to this node DGND Digital Ground This pin supplies the reference for the 5 VDC supply 5 V DGND Output 45 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 ICP circuits of the BNC 2140 NOTE For ACH lt 0 3 gt ACH lt 0 3 gt Table 3 1 DACOOUT DACOOUT DACI1OUT and DAC1OUT descriptions see A Caution Refer to Figure 3 1 for the pin assignments
23. m transducers so the voltages can be scaled to measure physical phenomena in an AC coupled circuit the frequency below which signals are attenuated by at least 3 dB meters 1 Mega the standard metric prefix for 1 million or 10 when used with units of measure such as volts and hertz 2 mega the prefix for 1 048 576 or 22 when used with B to quantify data or computer memory most significant bit mean time between failure mean time to repair predicts downtime and how long it takes to fix a product BNC 2140 User Manual Glossary NC NIST noise nonreferenced signal sources NRSE 0 onboard channels output settling time output slew rate P passband PCI BNC 2140 User Manual normally closed or not connected National Institute of Standards and Technology an undesirable electrical signal Noise 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 Noise corrupts signals you are trying to send or receive signal sources with voltage signals that are not connected to an absolute reference or system ground Also called floating signal sources Some common example of nonreferenced signal sources are batteries transformers or thermocouples nonreferenced single ended mode all mea
24. mbedded charge amplyfier ICP that allows you to use inexpensive cables such as BNC cables Leveraging off this technology some manufacturers use ICP signal conditioning to power their prepolarized microphones If your application requires a microphone preamplifier for use with a prepolarized microphone see Optional Equipment in Chapter 1 for a list of recommended suppliers You must enable ICP to generate the required power for each channel that uses these types of accelerometers and microphone preamplifiers When you disable ICP the connection from the ICP circuit to the analog input signal breaks and has no impact on the incoming signal When you disable ICP on an input channel the circuitry of two channels is still energized If you do not require ICP to be enabled on any of the four input channels turn off the ICP power to de energize the circuitry Turning off the ICP power removes any noise the circuitry can induce on the incoming signal You can also use the BNC 2140 to select between DIFF and SE input modes The BNC 2140 works with any DSA device that has a differential input stage for each input channel In DIFF mode one line connects to the positive input of the channel and the other connects to the negative input of that same channel You can connect the differential input to either floating or ground referenced signals You can use ICP signal conditioning when the BNC 2140 inputs are either in DIFF or SE mode National I
25. mode range common mode signal common mode voltage compensation range conversion device conversion time coupling crosstalk current drive capability current sinking current sourcing National Instruments Corporation G 3 Glossary 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 For digital signals you group channels to form ports Ports usually consist of either four or eight digital channels common mode rejection ratio a measure of an instrument s ability to reject interference from a common mode signal usually expressed in decibels dB the input range over which a circuit can handle a common mode signal 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 range of a parameter for which compensating adjustment can be made device that transforms a signal from one form to another For example analog to digital converters ADCs for analog input digital to analog converters DACs for analog output digital input or output ports and counter timers are conversion devices the time required in an analog input or output system from the moment a channel is interrogated such as with a read instruction to the moment that accurate data is available
26. nd of this manual viii National Instruments Corporation Introduction 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 Thank you for buying the BNC 2140 accessory for DSA The BNC 2140 is a signal conditioning accessory specifically designed for use with a dynamic signal acquisition DSA series device It interfaces four BNC signal inputs and two BNC signal outputs directly to National Instruments DSA products including the PCI 4451 PCI 4452 NI 4551 and NI 4552 The BNC 2140 connects to Integrated Circuit Piezoelectric ICP accelerometers and microphone preamplifiers as well as any other voltage source whose output is less than 42 4 V Each input channel consists of an independent 4 mA current source suitable for use with ICP type accelerometers and microphone preamplifiers You can manually enable or disable the ICP signal conditioning on a per channel basis When disabled the BNC 2140 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 tethers to a clean analog ground through a 50 Q resistor The BNC 2140 receives power for the ICP signal conditioning from the DSA plug in board via the 68 pin high density connector A green LED indicates when the ICP circuitry is powered on When you do not require
27. nections The BNC 2140 analog output signals are DACOOUT DACOOUT 4DACIOUT and DACIOUT DACOOUT is the voltage output signal for analog output channel 0 DACIOUT is the voltage output signal for analog output channel 1 Connection of analog output signals from your BNC 2140 accessory depends on the configuration of the devices receiving the signals For most signals you use a DIFF configuration and simply connect DACxOUT where x is the BNC 2140 channel to the signal and DACxOUT to the signal ground or signal minus as appropriate When driving some floating devices you may sometimes find it helpful to use the SE configuration and connect the floating ground system of the device to AOGND to reduce common mode noise coupled from an interfering source to the device A Caution When you configure an analog output channel in the SE mode the voltage between AOGND and DACXOUT must not exceed 7 07 V 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 damages resulting from connections that exceed this rating O National Instruments Corporation 3 5 BNC 2140 User Manual Theory of Operation This chapter contains a functional overview of the BNC 2140 National Instruments Corporation 4 1 BNC 2140 User Manual Chapter 4 Theory of Operation Functional Overview Figure 4 1 is a block diagram of the BNC 2140
28. nstruments Corporation 4 3 BNC 2140 User Manual Chapter 4 Theory of Operation Analog Output The BNC 2140 has two analog output channels The BNC 2140 can also select between DIFF and SE outputs In DIFF mode one line connects to the positive output of the channel and the other connects to the negative output of that same channel You can connect the differential output to either floating or ground referenced signals BNC 2140 User Manual 4 4 National Instruments Corporation Specifications Analog Input This appendix lists the specifications of the BNC 2140 accessory All specifications are typical at 25 C unless otherwise noted All specifications are relative to measurement standards and require a 15 minute warm up period Specifications do not include transducer error Voltage Input Number of channels 4 Maximum input voltage Signal common mode voltage Each input should remain within 42 4 V 30 Vims of any other input or of AIGND Inputs affected e ACHO ACH1 ACH2 ACH3 Input coupling 00000 DC Input capacitance DIFF mode Current excitation on 85 pF Current excitation off 75 pF SE mode Current excitation on 150 pF Current excitation off 145 pF Current Excitation ACCULACY seis sieves ele a ane 1 31 Includes the effects of the BNC 2140 with a 1 m SHC68
29. o our Internet host ftp natinst com aS anonymous and use your Internet address such as joesmith anywhere com as your password The support files and documents are located in the support directories National Instruments Corporation B 1 BNC 2140 User Manual Fax on Demand Support Fax on Demand is a 24 hour information retrieval system containing a library of documents on a wide range of technical information You can access Fax on Demand from a touch tone telephone at 512 418 1111 E Mail Support Currently USA Only You can submit technical support questions to the applications engineering team through e mail at the Internet address listed below Remember to include your name address and phone number so we can contact you with solutions and suggestions support natinst com Telephone and Fax Support National Instruments has branch offices all over the world Use the list below to find the technical support number for your country If there is no National Instruments office in your country contact the source from which you purchased your software to obtain support Country Australia Austria Belgium Brazil Canada Ontario Canada Qu bec Denmark Finland France Germany Hong Kong Israel Italy Japan Korea Mexico Netherlands Norway Singapore Spain Sweden Switzerland Taiwan United Kingdom United States BNC 2140 User Manual Telephone 03 9879 5166 0662 45 79 90 0 02 757 00 20 011 288 3336 90
30. ou do change the value of such a parameter the new value becomes the new setting You can set default settings for some parameters in the configuration utility or manually using switches located on the device a high accuracy circuit that samples at a higher rate and lower resolution than is needed and by means of feedback loops pushes the quantization noise above the frequency range of interest This out of band noise is typically removed by digital filters digital ground signal differential mode an analog input consisting of two terminals both of which are isolated from computer ground whose difference is measured a 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 digital input output G 4 National Instruments Corporation DNL dynamic range EMC F floating signal sources gain gain accuracy Srms grounded measurement system H h hardware hex National Instruments Corporation G 5 Glossary differential nonlinearity a measure in least significant bit of the worst case deviation of code widths from their ideal value of 1 LSB the ratio of the largest signal level a circuit can handle to the smallest signal level it can handle usually taken to be the noise level normally expressed in decibels electromechanical compliance signal sources with voltage signals that are not conne
31. rt number 787191 1 1 3 BNC 2140 User Manual Installation and Configuration This chapter explains how to install and configure your BNC 2140 accessory Installation CF Note You must turn the power off to your computer before installing the BNC 2140 The following are general installation instructions 1 Insert either end of your SHC68 C68 A1 analog cable into the 68 pin connector on the BNC 2140 Insert the other end into the 68 pin connector on the DSA plug in device 2 Tighten the jack screws finger tight on both ends of the cable Check the installation 4 Turn on your 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 have ICP signal conditioning enabled or disabled and for DIFF and SE measurements You can also configure each output channel for DIFF or SE measurements You can turn the power on or off for the ICP signal conditioning circuitry If you do not require ICP signal conditioning turn off the ICP power Refer to Figure 2 1 for the location of the switches i Note You can connect or disconnect BNC cables carrying signals without turning off the computer National Instruments Corporation 2 1 BNC 2140 User Manual Chapter 2 Installation and Configuration
32. ser Manual 3 2 National Instruments Corporation Chapter 3 Signal Connections Figure 3 1 describes the pin connections on the BNC 2140 68 pin connector ACHO AIGND ACH1 AIGNDt ACH2 AIGND ACH3 AIGND NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC DACOOUT AOGND DAC1QUT AOGND NC NC NC NC 5 V DGND tThese AIGND and AOGND pins are not connected in the SHC6868 A1 cable 35 36 37 38 39 40 41 oWjnjojniajojni 42 co 43 ee o 44 a a 45 no 46 wo 47 A 48 u oa 49 e om 50 one N 51 e co 52 a co 53 no o 54 no 55 N N 56 N w 57 N S 58 no 01 59 no O 60 na lt 61 no co 62 N co 63 ev o 64 wo 65 QA N 66 A oe 67 34 68 ACHO AIGND ACH1 AIGND ACH2 AIGND ACH3 AIGND NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC DACOOUT AOGND DAC10UT AOGND NC NC NC NC 45 V DGND National Instruments Corporation Figure 3 1 BNC 2140 External 68 Pin Analog Connector BNC 2140 User Manual Chapter 3 ic Note Signal Connections This BNC 2140 pin assignment maps to the pin assignment of the DSA device you are connectin
33. sk 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 reproduce the problem Documentation Comment Form National Instruments encourages you to comment on the documentation supplied with our products This information helps us provide quality products to meet your needs Title BNC 2140 User Manual Edition Date June 1998 Part Number 321933B 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 E Mail A ddress Phone Fax Mail to Technical Publications Fax to Technical Publications National Instruments Corporation National Instruments Corporation 6504 Bridge Point Parkway 512 794 5678 Austin Texas 78730 5039 Glossary Prefix Meanings Value p pico 10 2 n nano 10 9 u micro 10 6 m milli 10 3 k kilo 103 M mega 105 G giga 10 t tera 101 Numbers Symbols percent positive of or plus negative of or minus per degree Q ohm 5 V 5 V VDC source signal A
34. struments Corporation Chapter 1 Introduction If your application requires that you use a prepolarized microphone with a microphone preamplifier contact Briiel and Kjer Custom Cabling National Instruments offers cables of different lengths for the BNC 2140 accessory to connect your analog I O signals to the DSA devices National Instruments recommends that you not develop your own cabling solution due to the high density connector that is required and the necessity to maintain high signal integrity If your application requires you to develop your own cable use the following guidelines National Instruments Corporation Use shielded twisted pair wires for each differential analog input or output channel pair Since the signals are differential using this type of wire yields the best results When connecting the cable shields be sure to connect the analog input grounds to the AIGND pins and the analog output grounds to the AOGND pins For a connector pinout description refer to Table 3 2 in Chapter 3 Signal Connections You can create your own accessories by using a 68 pin very high density cable interconnect VHDCI receptacle header using AMP 68 position right angle PWB receptacle header 787254 1 Recommended manufacturer part numbers for the 68 pin mating connector for the cable assembly are as follows AMP 68 position cable straight plug part number 787131 3 AMP 68 position backshell with jackscrews pa
35. surements are made with respect to a common NRSE measurement system reference but the voltage at this reference can vary with respect to the measurement system ground channels provided by the plug in data acquisition board the amount of time required for the analog output voltage to reach its final value within specified limits the maximum rate of change of analog output voltage from one level to another the range of frequencies which a device can properly propagate or measure Peripheral Component Interconnect a high performance expansion bus architecture originally developed by Intel to replace ISA and EISA It is achieving widespread acceptance as a standard for PCs and work stations it offers a theoretical maximum transfer rate of 132 Mbytes s G 8 National Instruments Corporation peak to peak pF ppm pts R relative accuracy resolution rise time rms RSE SE settling time National Instruments Corporation G 9 Glossary a measure of signal amplitude the difference between the highest and lowest excursions of the signal pico farad a farad is a unit used to measure capacitance parts per million points a measure in LSB of the accuracy of an ADC It includes all non linearity and quantization errors It does not include offset and gain errors of the circuitry feeding the ADC the smallest signal increment that can be detected by a measurement system Resolution can be expressed in bi
36. t 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 Contents About This Manual Organization of This Manual vii Conventions Used in This Manual viii Related Documentation siseses isre ieoi E E E O viii Customer Communication 3 580380 secsbesssedscscenssegesbsceescents dada dig ada gta delj viii Chapter 1 Introduction What You Need to Get Started aaa vana 1 2 Unpacking is si sis ai REN pe bebe E E i e o bp bite 1 2 Optional Eguiprment s ii i si oreo die adna GEA kA EGA Je dado cvala da 1 2 Custom Ca
37. ts in proportions or in percent of full scale For example a system has 12 bit resolution one part in 4 096 resolution and 0 0244 of full scale the difference in time between the 10 and 90 points of a system s step response root mean square the square root of the average value of the square of the instantaneous signal amplitude a measure of signal amplitude see SE seconds samples single ended a term used to describe an analog input that is measured with respect to a common ground the amount of time required for a voltage to reach its final value within specified limits BNC 2140 User Manual Glossary Shannon Sampling Theorem SNR source impedance SS S s system noise THD THD N transducer transducer excitation U unipolar update rate BNC 2140 User Manual a law of sampling theory stating that if a continuous bandwidth limited signal contains no frequency components higher than half the frequency at which it is sampled then the original signal can be recovered without distortion signal to noise ratio the ratio of the overall rms signal level to the rms noise level expressed in decibels a parameter of signal sources that reflects current driving ability of voltage sources lower is better and the voltage driving ability of current sources higher is better simultaneous sampling a property of a system in which each input or output channel is digitized or updated at the s
38. ugh 3 Each channel can have ICP enabled or disabled This signal passes through the BNC internal conductor ACH lt 0 3 gt AIGND Input Analog Input Channel 0 through 3 In SE mode the inverting terminal is tethered to ground through a 50 Q resistor This signal passes through the external BNC shell DACOOUT DACOOUT Output Analog Output Channel 0 This pin supplies the analog non inverting output channel 0 This signal passes through the internal BNC conductor DACOOUT DACOOUT 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 terminal is tethered 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 4DACIOUT DACIOUT Output Analog Output Channel 1 This pin supplies the analog non inverting output channel 1 This signal passes through the internal BNC conductor DAC1IOUT DACIOUT Output Analog Output Channel 1 This pin supplies the analog inverting output channel This signal passes through the external BNC shell In SE mode the inverting terminal is tethered to ground through a 50 Q resistor BNC 2140 U
Download Pdf Manuals
Related Search