National Instruments BNC-2140 User Manual Download

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DAQ

BNC-2140 User Manual

Dynamic Signal Acquisition Signal Conditioning Accessory

BNC-2140 User Manual

June 1998 Edition

Part Number 321933B-01

UM.book Page 1 Tuesday, July 14, 1998 10:37 AM

Summary of Contents for BNC-2140

Page 1: ...DAQ BNC 2140 User Manual Dynamic Signal Acquisition Signal Conditioning Accessory BNC 2140 User Manual June 1998 Edition Part Number 321933B 01 UM book Page 1 Tuesday July 14 1998 10 37 AM...

Page 2: ...5 785 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 Kor...

Page 3: ...t 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...

Page 4: ...l Equipment 1 2 Custom Cabling 1 3 Chapter 2 Installation and Configuration Installation 2 1 Device Configuration 2 1 Chapter 3 Signal Connections I O Connectors 3 1 Analog Input Signal Connections 3...

Page 5: ...unication Glossary Index Figures Figure 2 1 Switch Settings and Signal Connections 2 2 Figure 3 1 BNC 2140 External 68 Pin Analog Connector 3 3 Figure 4 1 BNC 2140 Block Diagram 4 2 Tables Table 3 1 B...

Page 6: ...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 Appe...

Page 7: ...text denotes a variable emphasis a cross reference or an introduction to a key concept SE SE means referenced single ended RSE Related Documentation The following documents contain information you may...

Page 8: ...s 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 pream...

Page 9: ...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 packa...

Page 10: ...isted 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...

Page 11: ...f the cable 3 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 swit...

Page 12: ...Chapter 2 Installation and Configuration BNC 2140 User Manual 2 2 National Instruments Corporation Figure 2 1 Switch Settings and Signal Connections UM book Page 2 Tuesday July 14 1998 10 37 AM...

Page 13: ...ector Signal Descriptions Signal Name Reference Direction Description ACH 0 3 AIGND Input Analog Input Channel 0 through 3 Each channel can have ICP enabled or disabled This signal passes through the...

Page 14: ...ough the internal BNC conductor DAC1OUT DAC1OUT 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...

Page 15: ...NC NC NC AIGND ACH3 AIGND ACH2 AIGND ACH1 AIGND ACH0 DGND NC NC NC AOGND DAC1OUT AOGND 5 V NC DAC0OUT NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC AIGND ACH3 AIGND ACH2 AIGND ACH1 AIGND ACH0 1 35 2...

Page 16: ...2 68 Pin Analog I O 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...

Page 17: ...log Output Signal Connections The BNC 2140 analog output signals are DAC0OUT DAC0OUT DAC1OUT and DAC1OUT DAC0OUT is the voltage output signal for analog output channel 0 DAC1OUT is the voltage output...

Page 18: ...National Instruments Corporation 4 1 BNC 2140 User Manual 4 Theory of Operation This chapter contains a functional overview of the BNC 2140 UM book Page 1 Tuesday July 14 1998 10 37 AM...

Page 19: ...pply ICP Current Source 0 ICP Enable on off AICH0 BNC Connector DIFF SE 50 AICH0 AICH0 AIGND 3 5 V 30 V ICP CH3 Isolated Power Supply ICP Current Source 3 ICP Enable on off AICH3 BNC Connector DIFF SE...

Page 20: ...h 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 acceler...

Page 21: ...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 chann...

Page 22: ...Analog Input Voltage Input Number of channels 4 Maximum input voltage Signal common mode voltage Each input should remain within 42 4 V 30 Vrms of any other input or of AIGND Inputs affected ACH0 ACH1...

Page 23: ...ctions in Chapter 3 Signal Connections Output coupling DC Power Requirement from DSA board Power consumption 400 mA at 5 VDC Physical Dimensions 14 0 by 11 2 by 3 8 cm 6 0 by 4 4 by 1 6 in I O connect...

Page 24: ...tions 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 F...

Page 25: ...contact the source from which you purchased your software to obtain support Country Telephone Fax Australia 03 9879 5166 03 9879 6277 Austria 0662 45 79 90 0 0662 45 79 90 19 Belgium 02 757 00 20 02 7...

Page 26: ..._______________________________________________________________ _______________________________________________________________________________ National Instruments hardware product model ____________...

Page 27: ..._______________________________________________________________ _______________________________________________________________________________ ________________________________________________________...

Page 28: ...6 m milli 10 3 k kilo 103 M mega 106 G giga 109 t tera 1012 Numbers Symbols percent positive of or plus negative of or minus per degree ohm 5 V 5 V VDC source signal A A amperes AC alternating curren...

Page 29: ...how close to constant the gain of a circuit remains over a range of frequencies AOGND analog output ground signal attenuate to decrease the amplitude of a signal attenuation ratio the factor by which...

Page 30: ...ch compensating adjustment can be made conversion device device that transforms a signal from one form to another For example analog to digital converters ADCs for analog input digital to analog conve...

Page 31: ...ng and the default setting may be no AMUX 64T boards If you 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 config...

Page 32: ...ted to an absolute reference or system ground Also called nonreferenced signal sources Some common example of floating signal sources are batteries transformers or thermocouples G gain the factor by w...

Page 33: ...ine wave and a 15 kHz sine wave added in a 1 1 amplitude ratio in inches INL integral nonlinearity a measure in LSB of the worst case deviation from the ideal A D or D A transfer characteristic of the...

Page 34: ...a type of signal conditioning in which software linearizes the voltage levels from transducers so the voltages can be scaled to measure physical phenomena low frequency corner in an AC coupled circuit...

Page 35: ...transformers or thermocouples NRSE nonreferenced single ended mode all measurements are made with respect to a common NRSE measurement system reference but the voltage at this reference can vary with...

Page 36: ...ected by a measurement system Resolution can be expressed in bits 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...

Page 37: ...itized or updated at the same instant S s samples per second used to express the rate at which a DAQ board samples an analog signal system noise a measure of the amount of noise seen by an analog circ...

Page 38: ...Vin volts in VOH volts output high VOL volts output low Vref reference voltage W waveform multiple voltage readings taken at a specific sampling rate working voltage the highest voltage that should b...

Page 39: ...of BNC 2140 4 2 BNC 2140 block diagram 4 2 custom cabling 1 3 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...

Page 40: ...ometers 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 I O connectors 3 1...

Page 41: ...al 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 switch...

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