BNC-2090 User Manual Rack-Mount BNC Accessory March 1996 Edition Part Number 321183A-01 Copyright 1996 National Instruments Corporation. All Rights Reserved.
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Important Information Warranty The BNC-2090 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.
Table of Contents About This Manual Organization of This Manual ........................................................................................ix Conventions Used in This Manual ................................................................................x Related Documentation .................................................................................................x Customer Communication ............................................................................................
Table of Contents Chapter 3 Signal Conditioning Application Examples Adding Signal Conditioning Components .................................................................... 3-1 Soldering and Desoldering on the BNC-2090 ............................................... 3-3 Analog Input ................................................................................................................. 3-3 Building Lowpass Filters ...............................................................................
Table of Contents Figures Figure 2-1. Figure 2-2. Figure 2-3. Figure 2-4. Figure 2-5. Figure 2-7. BNC-2090 Rack-Mount Breakout Accessory ...................................... 2-1 BNC-2090 Front-Panel Switch Configurations .................................... 2-3 Accessing Jumper W1 .......................................................................... 2-5 Direct Connection of an MIO Board to the BNC-2090 ........................ 2-8 Connection between the DAQ Board, the BNC-2090 and SC-20XX Boards .
About This Manual The BNC-2090 User Manual describes the features, functions, and operation of the BNC-2090 accessory. The BNC-2090 is a rack-mount analog breakout accessory with BNC-style connectors and spring-type terminal blocks.
About This Manual Conventions Used in This Manual 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, ACH<0..7> stands for ACH0 through ACH7). bold Bold text denotes menus, menu items, or dialog box buttons or options. italic Italic text denotes emphasis, a cross reference, or an introduction to a key concept.
About 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. These forms are in Appendix C, Customer Communication, at the end of this manual.
Chapter 1 Introduction This chapter describes the BNC-2090 accessory, lists what you need to get started, and describes the optional equipment. About the BNC-2090 The BNC-2090 accessory is a rack-mount analog breakout accessory with signal-labeled BNC connectors, spring terminal blocks, and analog signal conditioning areas. The BNC-2090 accessory simplifies the connection of analog signals and digital signals to the DAQ board for use in laboratory, test, and production environments.
Chapter 1 Introduction ❑ Screwdrivers (Phillips and flathead) ❑ Four adhesive rubber feet (optional) Detailed specifications for the BNC-2090 are in Appendix A, Specifications. Optional Equipment You can also use the following National Instruments products with your BNC-2090, including cables, connector blocks, and other accessories: BNC-2090 User Manual • SSR Series 8-channel backplane (with 0.4 m cable for the SC-205X Series boards) • SC-2050, SC-2051, or SC-2055 board (with 0.5 or 1.
Chapter Configuration, Installation, and Signal Connection 2 This chapter explains how to configure the switches and jumper on the BNC-2090, install the BNC-2090, and connect signals to the accessory. Configuring Your BNC-2090 Your BNC-2090 is factory-configured.
Chapter 2 Configuration, Installation, and Signal Connection Mode Configuration The BNC-2090 is factory-configured for use with the MIO board in the DIFF mode. Therefore, you must configure the BNC-2090 if you want to use the accessory with the MIO board in either RSE or NRSE mode. The BNC-2090 has nine front panel switches, shown in Figure 2-1, that configure the accessory for differential (DIFF), referenced single-ended (RSE), or nonreferenced single-ended (NRSE) mode.
Chapter 2 Configuration, Installation, and Signal Connection Figure 2-2 shows the BNC-2090 front panel switches configured for DIFF, RSE, and NRSE modes.
Chapter 2 Configuration, Installation, and Signal Connection Table 2-1. Description Configuration W1 R1 100 Ω Jumper W1 Settings 100 Ω TO GND SHIELD GND 100 Ω to Ground—Use this setting to reduce any potential ground loop current, thereby improving the system noise performance. (When the BNC2090 is rack-mounted, it will be connected to a different ground.) This is the factory-default setting.
Chapter 2 Configuration, Installation, and Signal Connection To access and reconfigure jumper W1, perform the steps below. Figure 2-3 shows the parts of the BNC-2090 you must remove. 2 N INAT IO ST N RU AL MEN BN C- TS 3 20 90 4 1 1 Front Panel Screws 2 Rear Panel Screws 3 Side Panel Screw 4 Jumper W1 Figure 2-3. Accessing Jumper W1 1. Remove the six front panel screws. 2. Remove one side panel screw. 3. Remove two rear panel screws. 4.
Chapter 2 Configuration, Installation, and Signal Connection factory-default settings. Refer to Chapter 3, Signal Conditioning Application Examples, for more information. Installing Your BNC-2090 Perform the following steps to connect your BNC-2090 to your DAQ system. Consult your computer user manual or technical reference manual for specific instructions and warnings. 1.
Chapter 2 Configuration, Installation, and Signal Connection computer. Overvoltage can also cause an electric shock hazard for the operator. National Instruments is NOT liable for damage or injury resulting from such misuse. Accessory-to-Board Cabling The BNC-2090 has two 68-position connectors on the front and rear panels that you can use to connect to your DAQ board. Table 2-2 lists cables that you can use with the BNC-2090. Table 2-2.
Chapter 2 Configuration, Installation, and Signal Connection 68-Position Connector 68-Position Connector SH6868 or R6868 Cable 68-Pin MIO DAQ Board BNC-2090 MIO-16 68-Position Connector 100-Position Connector SH1006868 Cable 100-Pin MIO DAQ Board 68-Position Connector 68-Position Connector 50-Position Connector 50-Pin MIO or PC-LPM-16 DAQ Board BNC-2090 SH6850 or R6850 Cable BNC-2090 68 SH100100 Cable SH 100-Pin MIO DAQ Board 50 C ab le BNC-2090 able 50 C 8 SH6 SC-2056 Cable Adap
Chapter 2 Configuration, Installation, and Signal Connection SC-2070/72 General-Purpose Termination Breadboard MIO or PC-LPM-16 DAQ Board BNC-2090 SC-2050 Cable Adapter Board SH6868, R6868, SH6850, R6850 or SH1006868 Cable SH6850 or R6850 Cable Digital I/O SC-206X Series or 8-Channel SSR 26-Pin Cable Figure 2-5.
Chapter 2 Configuration, Installation, and Signal Connection Table 2-3. BNC-2090 Front Panel Labels (Continued) Signal Description BNC-2090 Front Panel Labels Terminal Blocks BNC-2090 User Manual USER1 User-Defined 1 (Connected to USER1 Terminal Block) USER2 User-Defined 2 (Connected to USER2 Terminal Block) DIO<7..
Chapter 2 Configuration, Installation, and Signal Connection Connecting Analog Inputs Connecting Nonreferenced (or Floating) Signal Sources A floating signal source is a signal source that is not connected in any way to the building ground system but has an isolated ground-reference point. If an instrument or device has an isolated output, that instrument or device falls into the floating signal source category.
Chapter 2 Configuration, Installation, and Signal Connection SE Inputs When measuring floating signal sources, configure the MIO board to supply a ground reference by placing the board in RSE mode. This mode ties the negative input of the MIO board instrumentation amplifier to the analog ground.
Chapter 2 Configuration, Installation, and Signal Connection A and B (see Table 3-1 and Figure 3-2), that connect the input to AIGND. This incorrect ground reference can cause inaccurate measurements. Connecting Analog Outputs Each analog output BNC connector has two open-component positions for optional signal conditioning components. One of these is designated as a resistor and the other as a capacitor.
Chapter 2 Configuration, Installation, and Signal Connection connectors provide some flexibility in choosing up to two additional digital/timing signals that you can access via BNC connectors. For example, if an application requires access to CTR0OUT and CTR1OUT signals, you can wire the spring terminals labeled CTR0OUT and CTR1OUT to terminals labeled USER1 and USER2, respectively. This configures BNC connector USER1 as CTR0OUT and USER2 as CTR1OUT.
Chapter Signal Conditioning Application Examples 3 This chapter contains instructions for adding signal conditioning components to your BNC-2090 and contains signal conditioning examples for the BNC-2090 in use with MIO boards. Adding Signal Conditioning Components The BNC-2090 has open-component positions in the input paths into which you can insert resistors and capacitors for conditioning the 16 single-ended or 8 differential analog input signals.
Chapter 3 Signal Conditioning Application Examples 6 5 7 N INAT IO ST N RU AL MEN BN TS C-2 4 09 0 3 2 1 1 4 7 2 5 Front Panel Screws Front Panel Nut Side Panel Screw Front Connector Screws 0 Ω Jumpers 3 6 Front Panel Washer Rear Panel Screws Figure 3-1. Disassembly of the BNC-2090 BNC-2090 User Manual 1. Remove the six front panel screws. 2. Remove one side panel screw. 3. Remove two rear panel screws. 4. Hold the front panel and slide the unit out of the metal case. 5.
Chapter 3 Signal Conditioning Application Examples Soldering and Desoldering on the BNC-2090 Some applications require you to modify the PWB, usually by removing 0 Ω jumpers and adding components. The BNC-2090 is shipped with 0 Ω jumpers in the C and D positions (see Table 3-1 and Figure 3-2). Use vacuum-type tools when desoldering on the BNC-2090 and avoid damaging component pads. Use a low-wattage soldering iron (20 to 30 W) when soldering to the board.
Chapter 3 Signal Conditioning Application Examples Table 3-1. Channel Component Positions (Continued) Position in Figure 3-2 Channel Differential Single-Ended A B C D E 6 6, 14 R13 R14 R31 R32 C7 7 7, 15 R15 R16 R33 R34 C8 NRSE AISENSE COMMON SW1 DIFF AIGND SE CH 8 CH 0 BNC BNC RSE SW9 R2 R1 B A AIGND Factory-Installed 0 Ω Jumpers D C R20 R19 C1 E ACH8 (-IN) ACH0 (+IN) To Input Multiplexer of MIO Board Figure 3-2.
Chapter 3 Signal Conditioning Application Examples Building Lowpass Filters You can install simple, RC lowpass filters in the BNC-2090 on any differential input channel. The filters are useful for accurate measurement and noise rejection.
Chapter 3 Signal Conditioning Application Examples Picking the capacitor first and letting its value determine the resistance required is preferable because more standard resistor values are available. If a capacitance of 1 µF is available, the resistance is (by substitution into Formula 3-1) about 39.8 kΩ. This resistance must be divided by two to get the resistor value on each input of a differential channel. Therefore, in this example, each input channel has a 19.
Chapter 3 Signal Conditioning Application Examples thereafter. Figure 3-5 shows a Bode plot of the amplitude versus normalized frequency. dB Amplitude 0 1 0.1 -20 0.01 -40 0.001 -60 0.0001 -80 0.0001 0.001 0.01 0.1 1 10 (fc ) Normalized Frequency Figure 3-5. Normalized Frequency Response of Highpass Filter When measuring high-frequency signals (about 50 kHz), if you have 50 Hz noise on your input signals, you can add a highpass filter with a cutoff frequency of 50 kHz.
Chapter 3 Signal Conditioning Application Examples the closest standard value) in its capacitor position, E. The closest standard 5% tolerance resistors are 6.2 kΩ. The closest standard 1% resistors are 6.34 kΩ. Figure 3-6 shows both the schematic and the component placement for a 50 kHz highpass filter placed on differential input channel 1. If the input signal source is floating, you must place a bias return resistor in the B position (R4 in this case).
Chapter 3 Signal Conditioning Application Examples attenuators external to the BNC-2090. You can use attenuators to reduce a signal that is outside the normal input range of the DAQ board (± 10 V maximum). Warning: The BNC-2090 is not designed for any input voltages greater than 42 V, even if a user-installed voltage divider reduces the voltage to within the input range of the DAQ board. Input voltages greater than 42 V can damage the BNC-2090, any and all boards connected to it, and the host computer.
Chapter 3 Signal Conditioning Application Examples 10 kΩ 1 G = ------------------------------------------------------------------ = --( 10 kΩ + 10 kΩ + 10 kΩ ) 3 (Formula 3-4) Therefore, 1 V MIO = --- ( V SC ) 3 (Formula 3-5) When the MIO board is configured for ± 10 V input signals, the board can acquire ± 30 V signals with this attenuator circuit. Notice that the input impedance for the channels employing voltage dividers circuit is reduced.
Chapter 3 Signal Conditioning Application Examples R18 DAC1OUT C10 DAC1OUT BNC Connector C9 DAC0OUT BNC Connector AGND R17 DAC0OUT AGND Figure 3-8. DAC0OUT and DAC1OUT You can remove and/or install components in these locations to build highpass and lowpass filters. Refer to Adding Signal Conditioning Components for instructions. Building Lowpass Filters Building lowpass filters for the analog output signals is the same as for the analog inputs.
Chapter 3 Signal Conditioning Application Examples DAC0OUT R17 = 39.8 kΩ DAC0OUT BNC Connector C9 = 1 µf AGND Figure 3-9. Lowpass Filter on DAC0OUT Building Highpass Filters Building highpass filters for analog output is the same as for analog input. Refer to Analog Input for more detailed information about highpass filters and how to calculate values for them. Refer to Figure 3-1 for component locations. Figure 3-10 shows a 50 kHz highpass filter for DAC0OUT. DAC0OUT R17 = .
Appendix A Specifications This appendix lists the specifications of the BNC-2090. Analog Input Input Characteristics Number of channels .......................... 16 single-ended or 8 differential Field connection ................................ 22 BNC connectors (18 analog,1 2 digital, and 2 user-defined), 28 spring terminal blocks Signal conditioning capability ...........
Appendix A Specifications Environment Operating temperature........................0° to 70° C Storage temperature ...........................-55° to 125° C Relative humidity...............................
Appendix B Using the PC-LPM-16 This appendix contains information on using the PC-LPM-16 with the BNC-2090. When using the PC-LPM-16 with the BNC-2090, the functions of the front panel switches and connectors are different because of the difference between the MIO I/O connector signals and the PC-LPM-16 I/O connector signals. Analog I/O The analog input section of a PC-LPM-16 DAQ board consists of 16 ground-referenced single-ended channels.
Appendix B Using the PC-LPM-16 Digital I/O Table B-1 shows the BNC-2090 front panel labels and the corresponding signal names when you use the accessory with a PC-LPM-16. Table B-1. BNC-2090 Front Panel Labels and Corresponding Signal Names for PC-LPM-16 BNC-2090 Front Panel Labels Switches BNC Connectors Terminal Blocks BNC-2090 User Manual Signal Name for PC-LPM-16 RSE/NRSE RSE SE/DIFF SE ACH<0..
Appendix B Table B-1.
Appendix B Using the PC-LPM-16 Table B-1.
Appendix Customer Communication C 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 the 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.
FaxBack Support FaxBack is a 24-hour information retrieval system containing a library of documents on a wide range of technical information. You can access FaxBack from a touch-tone telephone at the following number: (512) 418-1111 E-Mail Support (currently U.S. only) You can submit technical support questions to the appropriate applications engineering team through e-mail at the Internet addresses listed below.
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.
BNC-2090 Hardware Configuration Form Record the settings and revisions of your hardware on the line to the right of each item. Complete a new copy of this form each time you revise your hardware configuration, and use 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.
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-2090 User Manual Edition Date: March 1996 Part Number: 321183A-01 Please comment on the completeness, clarity, and organization of the manual.
Glossary Prefix Meaning Value m- milli- 10-3 µ- micro- 10-6 n- nano- 10-9 ° degrees Ω ohms % percent +5 V +5 volt signal A amperes AC alternating current ACH analog channel A/D analog to digital AIGND analog input ground AISENSE analog input sense signal ANSI American National Standards Institute C Celsius CMRR common-mode rejection ratio COMMON common signal CTROUT counter output signal National Instruments Corporation G-1 BNC-2090 User Manual
Glossary D/A digital to analog DAC0OUT DAC 0 output signal dB decibels DC direct current DGND digital ground DIFF differential input DIO digital I/O EXTREF external reference signal EXTSTRB external strobe signal F farads FREQOUT frequency out signal G gain GND ground signal Hz hertz in.
Glossary SCANCLK scan clock signal SE single-ended input SW switch TRIG trigger signal USER user-defined signal V volts VDC volts, direct current W watts National Instruments Corporation G-3 BNC-2090 User Manual
Index A shield ground jumper, 2-3 accessing jumper 1 (figure), 2-5 settings (table), 2-4 signal conditioning jumpers, 2-5 connecting your signals, 2-9 analog inputs, 2-11 ground-referenced signal sources, 2-12 DIFF inputs, 2-12 SE inputs, 2-12 nonreferenced (or floating) signal sources, 2-11 DIFF inputs, 2-11 analog inputs, 2-11 ground-referenced signal sources, 2-12 DIFF inputs, 2-12 SE inputs, 2-12 nonreferenced (or floating) signal sources, 2-11 DIFF inputs, 2-11 bias return resistor for DC-coupled fl
Index F DAC0OUT (figure), 3-12 filters. See also highpass filters, lowpass filters.
Index soldering and desoldering on the BNC-2090, 3-3 signal conditioning examples, 3-3 analog input, 3-3 building attenuators, 3-8 DIFF inputs (figure), 3-9 building highpass filters, 3-6 DIFF channel 1 (figure), 3-8 normalized frequency response (figure), 3-7 building lowpass filters, 3-5 DIFF channel 1 (figure), 3-6 normalized frequency response (figure), 3-5 channel component positions (table), 3-3 onboard equivalent circuit for DIFF mode (figure), 3-4 analog output, 3-10 DAC0OUT and DAC1OUT (figure), 3
Index specifications, A-1 spring terminal block labels (table), 2-10 storage environment, A-2 switch configurations, 2-2 to 2-3 figure, 2-3 mode configuration, 2-2 DIFF input mode, 2-2 RSE and NRSE input mode, 2-2 T terminal block labels (table), 2-10 V voltage dividers, building, 3-8 DIFF inputs (figure), 3-9 W W1 shield ground jumper, 2-3 setting options (table), 2-4 what you need to get started, 1-1 BNC-2090 User Manual I -4 National Instruments Corporation
