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Summary of Contents for National Instruments BNC-2140
- Page 1 BNC-2140 User Manual Dynamic Signal Acquisition Signal Conditioning Accessory BNC-2140 User Manual June 1998 Edition Part Number 321933B-01...
- Page 2 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 Headquarters 6504 Bridge Point Parkway Austin, Texas 78730-5039 USA Tel: 512 794 0100 © Copyright 1998 National Instruments Corporation. All rights reserved.
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Page 3: Important Information
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. -
Page 4: Table Of Contents
Analog Input Signal Connections ...3-5 Analog Output Signal Connections ...3-5 Chapter 4 Theory of Operation Functional Overview...4-2 Analog Input Circuitry...4-3 Analog Output...4-4 Appendix A Specifications Analog Input...A-1 Voltage Input...A-1 Current Excitation ...A-1 Analog Output ...A-2 © National Instruments Corporation BNC-2140 User Manual... - Page 5 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. BNC Analog I/O Connector Signal Descriptions ... 3-1 Table 3-2.
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Page 6: About This Manual
• • © 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. -
Page 7: Conventions Used In This Manual
• Customer Communication National Instruments wants to receive your comments on our products and manuals. We are interested in the applications you develop with our products, and we want to help if you have problems with them. To make it easy for you to contact us, this manual contains comment and configuration forms for you to complete. -
Page 8: Introduction
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. -
Page 9: What You Need To Get Started
Chapter 1 Introduction What You Need to Get Started To set up and use your BNC-2140 device, you will need the following: Unpacking 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. -
Page 10: Custom Cabling
Brüel and Kjær. 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. -
Page 11: Installation And Configuration
This chapter explains how to install and configure your BNC-2140 accessory. Installation Note You must turn the power off to your computer before installing the BNC-2140. The following are general installation instructions. The BNC-2140 accessory is now installed. Device Configuration You must manually configure the BNC-2140 accessory by setting the channel switches. -
Page 12: Figure 2-1. Switch Settings And Signal Connections
Chapter 2 Installation and Configuration ® Figure 2-1. Switch Settings and Signal Connections BNC-2140 User Manual © National Instruments Corporation... -
Page 13: Signal Connections
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. - Page 14 Table 3-1. BNC Analog I/O Connector Signal Descriptions (Continued) Signal Name Reference +DAC1OUT –DAC1OUT –DAC1OUT +DAC1OUT BNC-2140 User Manual Direction Output +Analog Output Channel 1—This pin supplies the analog non-inverting output channel 1. This signal passes through the internal BNC conductor. Output –Analog Output Channel 1—This pin supplies the...
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Page 15: Figure 3-1. Bnc-2140 External 68-Pin Analog Connector
Figure 3-1 describes the pin connections on the BNC-2140 68-pin connector. † © National Instruments Corporation –ACH0 † AIGND –ACH1 † AIGND –ACH2 † AIGND –ACH3 † AIGND 10 44 11 45 12 46 13 47 14 48 15 49... -
Page 16: Table 3-2. 68-Pin Analog I/O Connector Signal Descriptions
Chapter 3 Signal Connections Note This BNC-2140 pin assignment maps to the pin assignment of the DSA device you are connecting to the BNC-2140. Refer to your DSA device user manual for the pin assignments specific to your device connection. -
Page 17: Analog Input 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) -
Page 18: Theory Of Operation
Theory of Operation This chapter contains a functional overview of the BNC-2140. © National Instruments Corporation BNC-2140 User Manual... -
Page 19: Functional Overview
Chapter 4 Theory of Operation Functional Overview Figure 4-1 is a block diagram of the BNC-2140. ICP CH0 Isolated Power Supply +5 V +30 V ICP CH3 Isolated Power Supply +5 V +30 V BNC-2140 User Manual ICP Enable on/off... -
Page 20: Analog Input Circuitry
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. -
Page 21: Analog Output
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. -
Page 22: Specifications
Input capacitance Current Excitation Level... 4 mA Accuracy ... ±1.31% Includes the effects of the BNC-2140 with a 1 m SHC68-C68-A1 analog cable © National Instruments Corporation DIFF mode Current excitation on ... 85 pF Current excitation off... 75 pF SE mode Current excitation on ... -
Page 23: Analog Output
Operating temperature ...0° to 40° C Storage temperature ...–55° to 150° C Relative humidity ...5% to 90% non-condensing BNC-2140 User Manual I/O Signals ...6 BNC connectors (outer shell DSA board connection ...68-pin 0.8 mm VHDCI female ) powered on or... -
Page 24: Appendix B Customer Communication
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. - Page 25 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.
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Page 26: Technical Support Form
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. -
Page 27: Documentation Comment Form
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. - Page 28 – negative of, or minus ° degree +5 V VDC source signal amperes alternating current AC coupled allowing the transmission of AC signals while blocking DC signals © National Instruments Corporation Value –12 –9 – 6 –3 BNC-2140 User Manual...
- Page 29 (for example, –5 V to +5 V) a type of coaxial signal connector BNC-2140 User Manual © National Instruments Corporation...
- Page 30 DAQ board to dissipate current for analog or digital output signals current sourcing the ability of a DAQ board to supply current for analog or digital output signals © National Instruments Corporation Glossary BNC-2140 User Manual...
- Page 31 BNC-2140 User Manual ), for signals in volts © National Instruments Corporation...
- Page 32 Specifically refers to the repetition frequency of a waveform. © National Instruments Corporation Glossary BNC-2140 User Manual...
- Page 33 BNC-2140 User Manual 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.
- Page 34 MTTR mean time to repair—predicts downtime and how long it takes to fix a product © National Instruments Corporation , used with B in quantifying data or , when used with B to quantify data or computer memory Glossary...
- Page 35 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. BNC-2140 User Manual © National Instruments Corporation...
- Page 36 © National Instruments Corporation Glossary BNC-2140 User Manual...
- Page 37 (for example, 0 to +10 V) update rate the number of output updates per second BNC-2140 User Manual G-10 © National Instruments Corporation...
- Page 38 © National Instruments Corporation G-11 Glossary BNC-2140 User Manual...
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Page 39: Figure
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... - Page 40 (table), 3-1 to 3-2 exceeding maximum ratings (caution), 3-4 to 3-5 pin connections (figure), 3-3 manual. See documentation. operation of BNC-2140. See theory of operation. optional equipment, 1-2 to 1-3 physical specifications, A-2 pin connections 68-pin analog connector (figure), 3-3...
- Page 41 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 unpacking the BNC-2140, 1-2 voltage input specifications, A-1 Index...
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