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Chapter 3 Signal Conditioning Application Examples

BNC-2090 User Manual

3-12



National Instruments Corporation

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.

Figure 3-10. Highpass Filter on DAC0OUT

DAC0OUT

BNC Connector

R17 = 39.8 k

Ω

DAC0OUT

AGND

C9 = 1

µ

f

DAC0OUT

BNC Connector

R17 = .0005

µ

f

DAC0OUT

AGND

C9 = 6.34 k

Ω

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Содержание BNC-2090

Страница 1: ...BNC 2090 User Manual Rack Mount BNC Accessory March 1996 Edition Part Number 321183A 01 Copyright 1996 National Instruments Corporation All Rights Reserved ...

Страница 2: ...ia 0662 45 79 90 0 Belgium 02 757 00 20 Canada Ontario 519 622 9310 Canada Québec 514 694 8521 Denmark 45 76 26 00 Finland 90 527 2321 France 1 48 14 24 24 Germany 089 741 31 30 Hong Kong 2645 3186 Italy 02 413091 Japan 03 5472 2970 Korea 02 596 7456 Mexico 95 800 010 0793 Netherlands 0348 433466 Norway 32 84 84 00 Singapore 2265886 Spain 91 640 0085 Sweden 08 730 49 70 Switzerland 056 200 51 51 T...

Страница 3: ...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 main...

Страница 4: ...nal Connection Configuring Your BNC 2090 2 1 Mode Configuration 2 2 DIFF Input Mode 2 2 RSE and NRSE Input Mode 2 2 Power Selection Switch 2 3 Shield Ground Jumper 2 3 Signal Conditioning Jumpers 2 5 Installing Your BNC 2090 2 6 Accessory to Board Cabling 2 7 Connecting Your Signals 2 9 Connecting Analog Inputs 2 11 Connecting Nonreferenced or Floating Signal Sources 2 11 DIFF Inputs 2 11 SE Input...

Страница 5: ...nents 3 1 Soldering and Desoldering on the BNC 2090 3 3 Analog Input 3 3 Building Lowpass Filters 3 5 Building Highpass Filters 3 6 Building Attenuators Voltage Dividers 3 8 Analog Output 3 10 Building Lowpass Filters 3 11 Building Highpass Filters 3 12 Appendix A Specifications Appendix B Using the PC LPM 16 Appendix C Customer Communication Glossary Index ...

Страница 6: ...Onboard Equivalent Circuit for DIFF Mode 3 4 Figure 3 3 Normalized Frequency Response of Lowpass Filter 3 5 Figure 3 4 Lowpass Filter on Differential Channel 1 3 6 Figure 3 5 Normalized Frequency Response of Highpass Filter 3 7 Figure 3 6 Highpass Filter on Differential Channel 1 3 8 Figure 3 7 Attenuator for Use with Differential Inputs 3 9 Figure 3 8 DAC0OUT and DAC1OUT 3 11 Figure 3 9 Lowpass F...

Страница 7: ...nfiguration Installation and Signal Connection explains how to configure the switches and jumper on the BNC 2090 install the BNC 2090 and connect signals to the accessory Chapter 3 Signal Conditioning Application Examples contains instructions for adding signal conditioning components to your BNC 2090 and contains signal conditioning examples for the BNC 2090 in use with the MIO boards Appendix A ...

Страница 8: ...rning DAQ Refers to the National Instruments data acquisition products MIO Refers to the National Instruments 100 pin 68 pin and 50 pin MIO Series boards SC 205X Refers to the National Instruments SC 2050 SC 2051 SC 2052 SC 2053 SC 2054 SC 2055 and SC 2056 boards SC 206X Refers to the National Instruments SC 2060 SC 2061 and SC 2062 boards SC 207X Refers to the National Instruments SC 2070 SC 2071...

Страница 9: ...omments 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 ...

Страница 10: ... 16 single ended analog input channels available on the accessory The BNC 2090 has silkscreened component locations for resistors and capacitors for building single pole highpass and lowpass filters and voltage dividers You can use the BNC 2090 with a 50 68 or 100 pin MIO DAQ board or a 50 pin PC LPM 16 DAQ board Refer to Appendix B Using the PC LPM 16 for information on using the PC LPM 16 with t...

Страница 11: ...l Equipment You can also use the following National Instruments products with your BNC 2090 including cables connector blocks and other accessories 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 0 m 50 pin cable SC 2056 board without cable SC 2060 SC 2061 or SC 2062 with 0 2 or 0 4 m 50 pin cable SC 2070 SC 2072 or SC 20...

Страница 12: ...configure your accessory if you want to do any of the following Use your BNC 2090 with a MIO board configured for RSE or NRSE mode Connect the BNC 2090 shield directly to digital ground DGND Use a PC LPM 16 as the BNC 2090 power source Condition your signals Refer to Chapter 3 Signal Conditioning Application Examples Figure 2 1 shows the front and back panels of the BNC 2090 Figure 2 1 BNC 2090 Ra...

Страница 13: ...ll 16 analog input channels are referenced to AIGND For more information on the input configurations see your MIO board user manual DIFF Input Mode The BNC 2090 is factory configured for DIFF mode so that all eight switches SW1 SW8 are in the DIFF position In DIFF mode the first eight analog BNC connectors ACH 0 7 are used and the remaining eight analog BNC connectors ACH 8 15 are not used BNC 209...

Страница 14: ... shield of the 68 position connectors and BNC 2090 metal case through a 100 Ω resistor to DGND or directly to DGND Table 2 1 shows your configuration options DAC1OUT DAC0OUT DIFF DIFF SE ACH9 ACH1 ACH8 DIFF ACH0 SE DIFF ACH10 SE ACH2 ACH12 ACH4 ACH11 DIFF ACH3 SE SE DIFF ACH13 SE ACH5 ACH14 DIFF DIFF ACH6 SE SE ACH15 N S E R ACH7 E R S DIFF Factory Default Setting DAC1OUT DAC0OUT DIFF DIFF SE ACH9...

Страница 15: ...2090 metal case is neither connected to any other ground via a rack mount nor connected to the MIO ground via a shielded cable such as the SH6868 Use this setting when you use the R6868 R6850 or SH6850 cable You can also disconnect the shield from the MIO ground by removing the jumper from W1 which prevents the ground loop current from being carried in the DGND return of the shielded cable This op...

Страница 16: ...anel screw 3 Remove two rear panel screws 4 Hold the front panel and slide the unit out of the metal case 5 Set jumper W1 as needed 6 Reassemble the BNC 2090 in reverse order Signal Conditioning Jumpers If you want to condition your input signals you may have to remove the 0 Ω jumpers on the PWB behind the front panel refer to Figure 3 1 If you do not need signal conditioning leave these jumpers i...

Страница 17: ...e host computer If you do not rack mount the accessory you can use the four adhesive rubber feet included in the BNC 2090 kit to keep the accessory stationary on your workbench 5 Connect the BNC 2090 to the DAQ board Refer to Table 2 2 to make sure you have the appropriate cable for your pin connector 6 Connect your field signals to the BNC 2090 at the BNC connectors or spring terminals Refer to C...

Страница 18: ...nections If you want to condition digital I O port signals with the National Instruments SC 206X Series boards you must use the SC 205X Series cable adapter board with your DAQ board If you are using an SC 205X Series cable adapter board or an SC 207X Series general purpose termination breadboard with the BNC 2090 refer to your SC 205X Series and SC 207X user manuals for installation instructions ...

Страница 19: ...C LPM 16 DAQ Board BNC 2090 BNC 2090 100 Pin MIO DAQ Board BNC 2090 BNC 2090 SC 2056 Cable Adapter Board BNC 2090 BNC 2090 BNC 2090 68 Position Connector SH6868 or R6868 Cable SH1006868 Cable SH100100 Cable S H 6 8 5 0 C a b l e SH6850 Cable SH6850 Cable S H 6 8 5 0 C a b l e SH6850 or R6850 Cable 100 Position Connector 50 Position Connector 68 Position Connector MIO 16 68 Position Connector 68 Po...

Страница 20: ... your MIO board user manual for information on the use of these signals Table 2 3 shows the front panel labels for the BNC and terminal block signal connectors Refer to your MIO board user manual for more information on these signals Table 2 3 BNC 2090 Front Panel Labels BNC 2090 Front Panel Labels Signal Description BNC Connectors ACH 0 15 Analog Channels 0 through 15 DAC0OUT D A Converter 0 Out ...

Страница 21: ...ital Input Output Channels 7 through 0 DGND1 Digital Ground 1 USER1 User Defined 1 Connected to USER1 BNC EXSTRB External Strobe SCANCLK Scan Clock 5 V 5 V Power GND Ground PFI 1 9 Programmable Function Input Channels 1 through 9 DGND2 Digital Ground 2 USER2 User Defined 2 Connected to USER2 BNC FREQOUT Frequency Out CTR1OUT Counter 1 Out CTR0OUT Counter 0 Out Table 2 3 BNC 2090 Front Panel Labels...

Страница 22: ... return path for the instrumentation amplifier bias currents floating sources must have a 10 100 kΩ resistor to AIGND on one input if DC coupled or both inputs if AC coupled For more detailed information on connections to floating signal sources and differential inputs refer to the configuration chapter in your MIO 16 board user manual You can install these bias resistors in positions A and B see ...

Страница 23: ...he host computer is plugged into the same power system The nonisolated outputs of instruments and devices that plug into the building power system fall into this category DIFF Inputs If the MIO board is configured for differential inputs ground referenced signal sources connected to the BNC 2090 need no special components added to the BNC 2090 You can leave the inputs of the BNC 2090 in the factor...

Страница 24: ...ipped with 0 Ω jumpers inserted into the R17 and R18 positions shown in Figure 3 8 You can easily remove these to build passive analog output signal conditioning circuits such as voltage dividers and lowpass filters Refer to Chapter 3 Signal Conditioning Application Examples for more information Figure 2 7 Analog Output Schematic for DACs Connecting Digital I O Signals Use the BNC 2090 BNC connect...

Страница 25: ... of the digital signals from the MIO board are available at the front panel of the BNC 2090 Refer to your MIO board user manual for information on the use of these signals If you want optical isolation of or relay control by the digital I O lines you must use the SC 2050 cable adapter board and the appropriate SC 206X Series digital signal conditioning board If you want access to all MIO signals v...

Страница 26: ...g the 16 single ended or 8 differential analog input signals You can also use the BNC 2090 in conjunction with other signal conditioning accessories This chapter covers several types of signal conditioning applications including filtering and attenuation To add signal conditioning components to the BNC 2090 you must disassemble the BNC 2090 to gain access to the open component positions The figure...

Страница 27: ... connector screws 7 Carefully slide the front panel off the unit and separate the two printed wire boards PWBs 8 Install and or remove components as necessary Refer to Soldering and Desoldering on the BNC 2090 for more information 9 Reassemble the BNC 2090 in reverse order When reassembling the two PWBs together make sure that all the pins are aligned in the correct holes on the board to board con...

Страница 28: ...og Input Each analog input signal has several open positions for passive signal conditioning components Four of these positions are designated as resistors and one is designated as a capacitor The factory default positions for the 0 Ω jumpers are the C and D positions of the input network as shown in Figure 3 2 You can remove these 0 Ω jumpers to build analog input signal conditioning circuits You...

Страница 29: ...DIFF Mode 6 6 14 R13 R14 R31 R32 C7 7 7 15 R15 R16 R33 R34 C8 Table 3 1 Channel Component Positions Continued Channel Position in Figure 3 2 Differential Single Ended A B C D E COMMON CH 8 BNC ACH8 IN ACH0 IN CH 0 R2 R1 B C1 E A AIGND Factory Installed 0 Ω Jumpers To Input Multiplexer of MIO Board BNC NRSE RSE AISENSE AIGND SE SW1 SW9 DIFF D R20 C R19 ...

Страница 30: ...decade of increase thereafter Figure 3 3 shows a Bode plot of the amplitude versus normalized frequency Figure 3 3 Normalized Frequency Response of Lowpass Filter When measuring low frequency signals about 4 Hz if you have 400 Hz noise on your input signals you can add a lowpass filter with a cutoff frequency of 4 Hz The 400 Hz noise then attenuates by 40 dB Notice that your 4 Hz signal also atten...

Страница 31: ...on mode rejection ratio CMRR Figure 3 4 shows both the schematic and the component placement for a 4 Hz lowpass 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 Note The BNC 2090 open component locations do not facilitate RC lowpass filters with the MIO board configured for single ended inpu...

Страница 32: ... other Picking the capacitor first and letting its value determine the resistance required is preferable because more standard resistor values are available The filter circuit has one series capacitor on each input signal of the differential channel Because the two capacitors are in series the capacitance value that must be substituted into Formula 3 1 is the series capacitance of the two capacito...

Страница 33: ... common mode rejection The BNC 2090 open component locations do not facilitate RC highpass filters with the MIO board configured for single ended inputs Therefore if the MIO board is configured for single ended inputs you must build highpass filters external to the BNC 2090 Figure 3 6 Highpass Filter on Differential Channel 1 Building Attenuators Voltage Dividers Attenuators or voltage dividers al...

Страница 34: ...shock hazard for the operator National Instruments is NOT liable for damage or injury resulting from such misuse Figure 3 7 shows a three resistor circuit for attenuating voltages at the differential inputs of the BNC 2090 The figure also shows the placement of the resistors on the open component positions for differential channel 1 The gain G of this attenuator is given by the following formula F...

Страница 35: ...ce impedance In general the input impedance presented by the voltage divider circuit must be much larger than the source impedance of the signal source to avoid signal loading errors If your application requires the use of thermocouples using a National Instruments SC 2070 board is better suited for the task The SC 2070 board is equipped with an onboard temperature sensor for use with thermocouple...

Страница 36: ...l Conditioning Components for instructions Building Lowpass Filters Building lowpass filters for the analog output signals is the same as for the analog inputs Refer to Analog Input for more detailed information about lowpass filters and how to calculate values for lowpass filters Refer to Figure 3 1 for component locations Figure 3 9 shows a 4 Hz lowpass filter for DAC0OUT R18 C10 DAC1OUT BNC Con...

Страница 37: ...alog 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 Figure 3 10 Highpass Filter on DAC0OUT DAC0OUT BNC Connector R17 39 8 kΩ DAC0OUT AGND C9 1 µf DAC0OUT BNC Connector R17 0005 µf DAC0OUT AGND C9 6...

Страница 38: ... open component positions per channel that allow simple passive lowpass or highpass filter voltage attenuator circuits in signal path Power Requirement from host computer 5 VDC 5 Typical 10 mA no signal conditioning installed Maximum 1 A fuse limited by host DAQ board Physical Dimensions 43 2 x 18 8 x 4 4 cm 19 by 7 4 by 1 7 in I O connector Two 68 position male connectors BNC connectors 22 Spring...

Страница 39: ...Appendix A Specifications BNC 2090 User Manual A 2 National Instruments Corporation Environment Operating temperature 0 to 70 C Storage temperature 55 to 125 C Relative humidity 5 to 90 noncondensing ...

Страница 40: ... also RSE mode which uses all 16 analog input BNC connectors Switches S1 through S8 must be in the SE position and S9 should be in the RSE position as shown in Figure B 1 Figure B 1 Switch Configurations for RSE Mode PC LPM 16 Note All the switches are required to be in the same position that is S1 through S8 must all be in the SE position and S9 must be in the RSE position to use the BNC 2090 wit...

Страница 41: ...Labels and Corresponding Signal Names for PC LPM 16 BNC 2090 Front Panel Labels Signal Name for PC LPM 16 Switches RSE NRSE RSE SE DIFF SE BNC Connectors ACH 0 15 No change DAC0OUT Center is 12 V outer is DIN1 DAC1OUT Center is 12 V outer is DIN1 EXTREF DIN0 PFI0 TRIG1 OUT1 USER1 Center is no change outer DIN2 shorted to DOUT3 USER2 Center is no change outer DIN2 shorted to DOUT3 Terminal Blocks D...

Страница 42: ...XSTRB DOUT7 SCANCLK DOUT6 5 V No change GND No change PFI1 EXTINT PFI2 EXTCONV PFI3 OUT0 PFI4 GATE0 PFI5 GATE1 PFI6 CLK1 PFI7 OUT2 PFI8 GATE2 PFI9 CLK2 DGND2 DOUT3 shorted to DIN2 USER2 No change FREQOUT DGND Table B 1 BNC 2090 Front Panel Labels and Corresponding Signal Names for PC LPM 16 Continued BNC 2090 Front Panel Labels Signal Name for PC LPM 16 ...

Страница 43: ...6 BNC 2090 User Manual B 4 National Instruments Corporation CTR1OUT OUT1 CTR0OUT 5 V Table B 1 BNC 2090 Front Panel Labels and Corresponding Signal Names for PC LPM 16 Continued BNC 2090 Front Panel Labels Signal Name for PC LPM 16 ...

Страница 44: ...t answer your questions we offer fax and telephone support through our technical support centers which are staffed by applications engineers Electronic Services 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 exa...

Страница 45: ... 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 Telephone Fax Australia 03 9 879 9422 03 9 879 9179 Austria 0662 45 79 90 0 0662 45 79 90 19 Belgium 02 757 00 20 02 757 03 11 Canada Ontario 519 622 9310 Canada Quebec 514 694 8521 514 694 4399 Denmark 45 76 2...

Страница 46: ...____________________________________________ _______________________________________________________________________________ National Instruments hardware product model___________ Revision ________________________ Configuration ___________________________________________________________________ National Instruments software product____________________________ Version____________ Configuration ____...

Страница 47: ...___________________________ SW2 _______________________________________________________________________ SW3 _______________________________________________________________________ SW4 ________________________________________________________________________ SW5 _______________________________________________________________________ SW6 _______________________________________________________________...

Страница 48: ...___________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ ____________________________...

Страница 49: ...nating 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 Prefix Meaning Value m milli 10 3 µ micro 10 6 n nano 10 9 Glossary ...

Страница 50: ...ut 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 inches I O input output LED light emitting diode m meters MIO multifunction I O NRSE nonreferenced single ended input PFI programmable function input RC resistance capacitance RSE referenced single ended input SC signal conditioning ...

Страница 51: ...sary National Instruments Corporation G 3 BNC 2090 User Manual 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 ...

Страница 52: ...ion 2 2 DIFF input mode 2 2 RSE and NRSE input mode 2 2 power selection switch 2 3 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 SE inputs 2 12 connector labels...

Страница 53: ...s 2 12 DIFF inputs 2 12 SE inputs 2 12 H highpass filters analog input 3 6 building filters 3 6 DIFF channel 1 figure 3 8 normalized frequency response figure 3 7 analog output 3 10 building filters 3 12 DAC0OUT figure 3 12 I installation 2 6 accessory to board cabling 2 7 cabling options table 2 7 MIO board connection figure 2 8 SC 20XX board connection figure 2 9 J jumper W1 shield ground 2 3 se...

Страница 54: ...ignal conditioning components 2 5 adding to the BNC 2090 3 1 disassembly of the BNC 2090 3 2 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 ...

Страница 55: ... 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 ...

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