Home

National Instruments PCI-1200 User's Manual

1. Figure 3 6 Single Ended Input Connections for Grounded Signal Sources Common Mode Signal Rejection Considerations Figures 3 4 and 3 6 show connections for signal sources that are already referenced to some ground point with respect to the PCI 1200 In these cases the instrumentation amplifier can reject any voltage caused by ground potential differences between the signal source and the PCI 1200 In addition with differential input connections the instrumentation amplifier can reject common mode noise pickup in the leads connecting the signal sources to the PCI 1200 The common mode input range of the PCI 1200 instrumentation amplifier is the magnitude of the greatest common mode signal that can be rejected 3 14 National Instruments Corporation Chapter 3 Signal Connections The common mode input range for the PCI 1200 depends on the size of the differential input signal V girs V in Vin and the gain setting of the instrumentation amplifier In unipolar mode the differential input range is 0 to 10 V In bipolar mode the differential input range is 5 to 5 V Inputs should remain within a range of 5 to 10 V in both bipolar and unipolar modes Analog Output Signal Connections Pins 10 through 12 on the I O connector are analog output signal pins Pins 10 and 12 are the DACOOUT and DACIOUT signal pins DACOOUT is the voltage output signal for analog output channel 0 DAC1OU
2. Settling Time Gain Accuracy 0 024 1 LSB 1 10 us typ 14 us max 2 10 13 us typ 16 us max 20 15 us typ 19 us max 50 27 us typ 34 us max 100 60 us typ 80 us max System noise including quantization error Gain Dither off Dither on 1 50 0 3 LSB rms 0 5 LSB rms 100 0 5 LSB rms 0 7 LSB rms Stability Recommended warm up time 15 min National Instruments Corporation A 3 PCI 1200 User Manual Appendix A Specifications Offset temperature coefficient PRES AIN ssori nienia 15 uV C Postgai esien 100 uv C Gain temperature coefficient 0 40 ppm C Explanation of Analog Input Specifications Relative accuracy is a measure of the linearity of an ADC However relative accuracy is a tighter specification than a nonlinearity specification Relative accuracy indicates the maximum deviation from a straight line for the analog input to digital output transfer curve If an ADC has been calibrated perfectly this straight line is the ideal transfer function and the relative accuracy specification indicates the worst deviation from the ideal that the ADC permits A telative accuracy specification of 1 LSB is roughly equivalent to but not the same as a 0 5 LSB nonlinearity or integral nonlinearity specification because relative accuracy encompasses both nonlinearity and variable quantization uncertainty a quantity often mistakenly assumed to be exactly 0 5 LSB Althou
3. PCI 1200 User Manual Figure 3 14 Event Counting Application with External Switch Gating Pulse width measurement is performed by level gating The pulse you want to measure is applied to the counter GATE input The counter is loaded with the known count and is programmed to count down while the signal at the GATE input is high The pulse width equals the counter difference loaded value minus read value multiplied by the CLK period Perform time lapse measurement by programming a counter to be edge gated An edge is applied to the counter GATE input to start the counter Program the counter to start counting after receiving a low to high edge The time lapse since receiving the edge equals the counter value difference loaded value minus read value multiplied by the CLK period To perform frequency measurement program a counter to be level gated and count the number of falling edges in a signal applied to a CLK input The gate signal applied to the counter GATE input is of known duration In this case program the counter to count falling edges at the CLK input while the gate is applied The frequency of the input signal then equals the count value divided by the gate period Figure 3 15 shows the connections for a frequency measurement application You can also use a second counter to 3 24 National Instruments Corporation Chapter 3 Signal Connections generate the gate signal in this application If you use a second co
4. External Scan Interval National Instruments Corporation 4 5 Figure 4 4 Analog Input Circuitry PCI 1200 User Manual Chapter 4 Theory of Operation Analog Input Circuitry PCI 1200 User Manual The analog input circuitry consists of two analog input multiplexers multiplexer mux counter gain select circuitry a software programmable gain amplifier a 12 bit ADC and a 16 bit sign extended FIFO memory One of the input multiplexers has eight analog input channels channels 0 through 7 The other multiplexer is connected to channels 1 3 5 and 7 for differential mode The input multiplexers provide input overvoltage protection of 35 V powered on and 25 V powered off The mux counters control the input multiplexers The PCI 1200 can perform either single channel data acquisition or multichannel scanned data acquisition These two modes are software selectable For single channel data acquisition you select the channel and gain before initiating data acquisition These gain and multiplexer settings remain constant during the entire DAQ process For multichannel scanned data acquisition you select the highest numbered channel and gain before initiating data acquisition Then the mux counter decrements from the highest numbered channel to channel 0 and repeats the process Thus you can scan any number of channels from two to eight Notice that you use the same gain setting for all channels in the scan
5. DAQ DATA dB DC DGND DI DIFF DIO DMA DNL DO E EEPROM National Instruments Corporation G 3 Glossary 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 DAC output update signal digital to analog converter 0 1 output signals DAC write signal data acquisition a system that uses the computer to collect receive and generate electrical signals data lines at the specified port signal decibel the unit for expressing a logarithmic measure of the ratio of two signal levels dB 20log10 V1 V2 for signals in volts direct current digital ground signal digital input differential digital input output direct memory access differential nonlinearity digital output electrically erasable programmable read only memory ROM that can be erased with an electrical signal and reprogrammed PCI 1200 User Manual Glossary EXTCONV EXTTRIG EXTUPDATE F F FIFO FSR ft G GATB lt 0 2 gt GATE IBF INL INTR T O PCI 1200 User Manual external convert signal external trigger signal external update signal farad first in first out memory buffer full scale range feet counter BO B1 B2 gate signals gate signal hexadecimal hertz input buffer full signal inches integral nonlinearity a measure in LSB of the worst case deviation fr
6. gt lt towi gt Vn CLK w o y a i KR Vit tyu ih e IH i i 1 GATE X X i x Vit i i s_ tgwh a tow lt _ lt v a bug lt toute gt OH O a o gt i A OUT j VoL tg clock period 380 ns minimum town Clock high level 230 ns minimum tow clock low level 150 ns minimum tysu gate setup time 100 ns minimum toh gate hold time 50 ns minimum tgwnh gate high level 150 ns minimum tgw gate low level 100 ns minimum toute Output delay from clock 300 ns maximum toutg Output delay from gate 400 ns maximum Figure 3 16 General Purpose Timing Signals The GATE and OUT signals in Figure 3 16 are referenced to the rising edge of the CLK signal PCI 1200 User Manual 3 26 National Instruments Corporation Chapter 3 Signal Connections Timing Specifications Use the handshaking lines STB and IBF to synchronize input transfers Use the handshaking lines OBF and ACK to synchronize output transfers The following signals are used in the mode timing diagrams Table 3 6 Signal Names Used in Timing Diagrams Name Type Description STB Input Strobe Input A low signal on this handshaking line loads data into the input latch IBF Output Input Buffer Full A high signal on this handshaking line indicates that data has been loaded into the input latch This is primarily an input acknowledge signal ACK Input Acknowledge Input A low signal on this handshaking line
7. 5 00 3 cd0ccccecedisccsvsacdeceses dacstceess lecedarchessotdussuctacsackedecestessadecbeteeees 2 1 Board Conf QurattOn s cscs eao soais ioe a E E ER E A A L OKEE E Tae 2 2 Analog I O Configuration eeeseeesesersseseereseerssrersreresresrsrtsreerrsestesrsresresenees 2 2 Analog Output Polarity iise e a a bent bedeebevee 2 3 Analog Input Polaritya s seriinin esrar keri isre ea 2 3 Analog Input Modes sr ana e eles A 2 3 RSE Input Eight Channels Reset Condition 2 4 NRSE Input Eight Channels ssesseeseeeeeeeeeeeereseeerersersreee 2 4 DIFF Input Four Channels ee ceeeeeceeeeeceteeeeeeeeneeenees 2 5 Chapter 3 Signal Connections T O COMME COL eaa a a a a a a areates 3 1 Signal Connection Descriptions sesseseesseesesestssestrststestsresreersresresrnresrseesreee 3 2 Analog Input Signal ConnectionSs sseeesseesseeessersersresrsresrsersrerrsrstrsreresresesees 3 5 National Instruments Corporation v PCI 1200 User Manual Contents Types Ob Sigtial SourceS ioes cei a cuevensie testes tuvevsseanbe tense tinal 3 7 Floating Signal Sources eee eee eeeeeseeeeeceeeeeeeneeeaee 3 7 Ground Referenced Signal Sources 000 0 eee eeeeeeeeeeeees 3 7 Input Configurations 00 eee eseeeesecseeeseeseeaeceeeesecneecesnaeseeeaees 3 7 Differential Connection Considerations DIFF Configuration 00 0 0 cee eeccceeeeeseeenecenreceaeeeneeeeaees 3 9 Differential Connections for Grounded Signal Sources 3
8. 6 Error Reporting 2 Arbitration 2 System 2 Interrupt 1 Address e a PA lt 0 7 gt DATA lt 0 7 gt 8 5 Bata e PB lt 0 7 gt Ca DIO RD WRT A Digital ORDAN 82C55A 8 Control 2 Programmable 4 x gt _ PC lt 0 7 gt MITE Control Logic Peripheral 8 g PCI 4 Interface Interface Interrupt 8 Chip o 1 PCO PC3 PCI 1200 User Manual Figure 4 6 Digital 1 0 Circuitry National Instruments Corporation Chapter 4 Theory of Operation All three ports on the 82C55A are TTL compatible When enabled the digital output ports are capable of sinking 2 5 mA of current and sourcing 2 5 mA of current on each digital I O line When the ports are not enabled the digital I O lines act as high impedance inputs National Instruments Corporation 4 13 PCI 1200 User Manual Calibration This chapter discusses the calibration procedures for the PCI 1200 analog T O circuitry However the PCI 1200 is factory calibrated and National Instruments can recalibrate your unit if needed To maintain the 12 bit accuracy of the PCI 1200 analog input and analog output circuitry recalibrate at 6 month intervals There are four ways to perform calibrations e Ifyou have LabVIEW use the 1200 Calibrate VI This VI is located in the Calibration and Configuration palette e If you have LabWindows CVI use the Calibrate_1200 function e If you do not have LabVIEW or LabWindo
9. 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 The media on which you receive National Instruments software are warranted not to fail to execute programming instructions due to defects in materials and workmanship for a period of 90 days from date of shipment as evidenced by receipts or other documentation National Instruments will at its option repair or replace software media that do not execute programming instructions if National Instruments receives notice of such defects during the warranty period National Instruments does not warrant that the operation of the software shall be uninterrupted or error free 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 shal
10. PCI Interface Ciruitry pes sev eet ela BR Eta A E ene ey 4 2 PAIN Basch tach ozs iea REEE ETE E R sieves hive stah EE A auehs ivachievrs ENEN DAA 4 3 Analog Input 2cncehiina agit title hited ade eei a Le aha iae eae hee 4 5 Analog Input GUCUIUtry ac 5 ose each acheter estes cai EE EEES EA S ea SH ASS i eie 4 6 DAQ Operations manine hie eA ea E Meuse tae ete 4 7 Controlled Acquisition Mode cece ceceesseeeseceeeeseceeeeeeenesaeeeaees 4 8 Freerun Acquisition Mode eee eeeeseesccesecseeeeesseenseceeeeaeeeeenees 4 8 Interval Scanning Acquisition Mode 0 0 eee ee eeeeseeeceeeceeeeseeeees 4 8 Single Channel Data Acquisition 0 0 0 cece eee eeeeeeeseceeeeeeseeteeeeeees 4 9 Multichannel Scanned Data Acquisition ce eeeeeeeeseeseeeeeeees 4 9 DAQ RateS 3 tices eere nee son hii Gs dati deled cide wsdl 4 10 Analog OUP a e seis erea E hele wes eter ees tets ees eta satvest epee viens 4 11 PCI 1200 User Manual vi National Instruments Corporation Contents Analog Output Ciwcuitty i 6 5602 Aves shes ell ea he ere E AR 4 11 DAC Timing 2 4 tina caietieSi tits a ae ae A ad 4 12 Dipitals V O AEE T EEE eerie bene deeme E dead Gert Mea 4 12 Chapter 5 Calibration Calibration at Higher Gains eee naei siia e aaa a EEE E a EEEa 5 2 Calibration Equipment Requirement 00 0 0 cies eseeeseeeesececeseeseeeseeseeeaeeseeeasenseeaes 5 2 Using the Calibration Function ao seetri sre iin ieina eiei srias arie ien 5 3 Appendix A Specific
11. gain amplifier After the input multiplexers are switched the amplifier must be allowed to settle to the new input signal value to within 12 bit accuracy The settling time is a function of the gain selected Output Characteristics Number of channels cesceeseeeeeeeees Two voltage Resolution cccccsseccccessssseceeeesssseeeeees 12 bits 1 in 4 096 Typical update rate eee 20 S s 1 kS s system dependent Type of DAG iiesiicisassetsass aa ssevesiey este Double buffered Data transfers ecien Interrupts programmed I O Transfer Characteristics Relative accuracy INL eee 0 25 LSB typ 0 50 LSB max DN EEEE E heh tal aR eee 0 25 LSB typ 0 75 LSB max MOMNOtONICItY eneee ania 12 bits guaranteed Offset error After calibration 0 2 mV max Before calibration ccccceeeeeees 50 mV max Gain error relative to internal reference After calibration eee 0 01 of reading max Before calibration eee 1 of reading max Voltage Output Ranges t ri Gee A Oto 10 V 5 V software selectable Output coupling s sseseeeseseeseesesererreresee DC Output impedance eee 0 2 Q typ Cutrent dri Vessan iiaia 2 mA Prot ction sissies Short circuit to ground A 6 National Instruments Corporation Appendix A Specifications Power on State ccccccccecceseeeseeeserereeees OV Dynamic Characteristics Settling time to full scale range FSR 5 us Stability Offset t
12. sign Thus data values read from the FIFO are 16 bits wide DAQ Operations This manual uses the phrase data acquisition operation abbreviated as DAQ operation to refer to a sequence of timed A D conversions The PCI 1200 performs DAQ operations in one of three modes controlled acquisition mode freerun acquisition mode and interval scanning acquisition mode The PCI 1200 performs both single channel and multichannel scanned data acquisition The DAQ timing circuitry consists of various clocks and timing signals that control the DAQ operation DAQ timing consists of signals that initiate a DAQ operation time the individual A D conversions gate the DAQ operation and generate scanning clocks The DAQ operation can be timed either by the timing circuitry or by externally generated signals These two timing modes are software configurable DAQ operations are initiated either externally through EXTTRIG or through software control The DAQ operation is terminated either internally by counter A1 of the 82C53 A counter timer circuitry which National Instruments Corporation 4 7 PCI 1200 User Manual Chapter 4 Theory of Operation PCI 1200 User Manual counts the total number of samples taken during a controlled operation or through software control in a freerun operation Controlled Acquisition Mode The PCI 1200 uses two counters counter AO and counter Al to execute DAQ operations in controlled acquisition mode Counter AO cou
13. 00 0 eeeeeeeeeeeeeeeeeeeee 3 8 Table 3 5 Port C Signal Assignments 0 ccs cee seeeseceeceseeseeeseseeeeaeeeseeasenseeaeens 3 18 Table 3 6 Signal Names Used in Timing Diagrams 00 0000 eee eeeseeseereeeeeees 3 27 Table 4 1 Analog Input Settling Time Versus Gain eee eee eeseeneeeeeeneeee 4 10 Table 4 2 PCI 1200 Maximum Recommended DAQ RateS cceseeeesseeeeeee 4 10 PCI 1200 User Manual viii National Instruments Corporation About This Manual This manual describes the electrical and mechanical aspects of the PCI 1200 and contains information concerning its operation and programming The PCI 1200 is a low cost multifunction analog digital and timing board The PCI 1200 is a member of the National Instruments PCI Series of expansion boards for PCI bus computers These boards are designed for high performance data acquisition DAQ and control for applications in laboratory testing production testing and industrial process monitoring and control Organization of This Manual The PCI 1200 User Manual is organized as follows National Instruments Corporation Chapter 1 Introduction describes the PCI 1200 lists what you need to get started software programming choices and optional equipment and explains how to build custom cables and unpack the PCI 1200 Chapter 2 Installation and Configuration describes how to install and configure your PCI 1200 Chapter 3 Signal Connections describes
14. 180 T6 RD 0 to INTR 0 E 400 T7 RD 1 to IBF 0 300 All timing values are in nanoseconds Figure 3 17 Mode 1 Timing Specifications for Input Transfers PCI 1200 User Manual 3 28 National Instruments Corporation Chapter 3 Signal Connections Mode 1 Output Timing The timing specifications for an output transfer in mode 1 are as follows ieee WRT a i 1 1 1 A ns aa E rr To Te a Ta 1 gt INTR _ ACK i DATA lt gm lt Name Description Minimum Maximum Tl WRT 0 to INTR 0 a 450 T2 WRT 1 to output 350 T3 WRT to OBF 0 650 T4 ACK 0 to OBF 1 350 T5 ACK pulse width 300 T6 ACK to INTR 1 350 All timing values are in nanoseconds Figure 3 18 Mode 1 Timing Specifications for Output Transfers National Instruments Corporation 3 29 PCI 1200 User Manual Chapter 3 Signal Connections Mode 2 Bidirectional Timing The timing specifications for bidirectional transfers in mode 2 are as follows Tt 4 lt P WRT T6 i OBF INTR ho ae lt _ gt ACK 13 __ STB i l i i T10 Ta Pr i I 1 a el IBF fo RD i f f a i 1 T2 TS 1 1 T8 it T9 1 gt gt i i ca lt p x Name Description Minimum Maximum Tl WRT 1 to OBF 0 650 T2
15. DAQ hardware is to write register level software Writing register level programming software can be very time consuming and inefficient and is not recommended for most users Even if you are an experienced register level programmer consider using NI DAQ LabVIEW LabWindows CVI or other National Instruments application software to program your National Instruments DAQ hardware Using the National Instruments application software is easier than and as flexible as register level programming and can save weeks of development time 1 4 National Instruments Corporation Chapter 1 Introduction Optional Equipment National Instruments offers a variety of products to use with your PCI 1200 board including cables connector blocks and other accessories as follows e Cables and cable assemblies e Connector blocks 50 pin screw terminals e SCXI modules and accessories for isolating amplifying exciting and multiplexing signals for relays and analog output With SCXI you can condition and acquire up to 3 072 channels To use the PCI 1200 with SCXI you need the SCXI 1341 adapter e Low channel count signal conditioning modules boards and accessories including conditioning for strain gauges and RTDs simultaneous sample and hold and relays For more information about optional equipment available from National Instruments refer to your National Instruments catalogue or call the office nearest you Custom Cabling Nationa
16. Data before STB 1 0 T3 STB pulse width 500 T4 STB 0 to IBF 1 n 300 T5 Data after STB 1 180 T6 ACK 0 to OBF 1 E 350 T7 ACK pulse width 300 T8 ACK 0 to output 300 T9 ACK 1 to output float 20 250 T10 RD 1 to IBF 0 E 300 All timing values are in nanoseconds Figure 3 19 Mode 2 Timing Specifications for Bidirectional Transfers PCI 1200 User Manual 3 30 National Instruments Corporation Theory of Operation This chapter explains the operation of each functional unit of the PCI 1200 Functional Overview The block diagram in Figure 4 1 shows a functional overview of the PCI 1200 board PCI Bus Data Address 37 Interface Control al 6 Error Reporting 2 Arbitration 2 System gt 2 Interrupt Interface Chip 1 y Dither Address 16 j lt 8 4 12 Bit Pgm Input FEO A D Gain I Mux A ji 4 4 Digital Z T Control 3 iai Logic aT Calibration y y 12 4 82C53 82C55A 12 bit 1 1 Cir Timer Digital i lt D A DRQ G 24 roup A Interface je A 12 a d gt 12 Bit P D A 82C53 i Mhz 8 Ctr Timer Timebase gt Group B Time 2 MHz 10 mns Divider Timebase Oscillator 1 0 Connector National Instruments Corporation Figure 4 1
17. MITE Control ogic Control Data 2 PCI 4 Arbitration Interface Interrupt PA Chip 5 1 a 5 DRQ a 4 Interrupt Figure 4 2 PCI Interface Circuitry 4 2 National Instruments Corporation Chapter 4 Theory of Operation The PCI 1200 generates an interrupt in the following five cases each of these interrupts is individually enabled and cleared e When a single A D conversion can be read from the A D FIFO memory e When the A D FIFO is half full e When a DAQ operation completes including when either an OVERFLOW or an OVERRUN error occurs e When the digital I O circuitry generates an interrupt e When arising edge signal is detected on the DAC update signal Timing The PCI 1200 uses two 82C53 counter timer integrated circuits for internal DAQ and DAC timing and for general purpose I O timing functions Figure 4 3 shows a block diagram of both groups of timing circuitry counter groups A and B National Instruments Corporation 4 3 PCI 1200 User Manual Chapter 4 Theory of Operation GATEB2 CLKB2 General J GATEB2 Purpose lt lt Counter CLKB2 ______ OUTB2 OPIS GATEB1 _J GATEB1 CLKB1 lt _ _ 1 MHz Source OUTBO Scan MUX Interval y General i i MUX Purpose CLKB1 Counter CLKAO OUTB1 lt gt
18. Theory of Operation Stanley P Lipshitz Journal of the Audio Engineering Society Vol 35 No 12 Dec 1987 The PCI 1200 uses a 12 bit successive approximation ADC The converter s 12 bit resolution allows it to resolve its input range into 4 095 different steps The ADC has an input range of 5 V and 0 to 10 V When an A D conversion is complete the ADC clocks the result into the A D FIFO The A D FIFO is 16 bits wide and 4 096 words deep This FIFO serves as a buffer to the ADC The A D FIFO can collect up to 4 096 A D conversion values before any information is lost thus allowing software some extra time to catch up with the hardware If you store more than 4 096 values in the A D FIFO before reading from it an error condition called A D FIFO overflow occurs and you lose A D conversion information The ADC output can be interpreted as either straight binary or two s complement depending on which coding scheme you select Straight binary is the recommended coding scheme for unipolar input mode With this scheme the ADC data is interpreted as a 12 bit straight binary number with a range of 0 to 4 095 Two s complement is the recommended coding scheme for bipolar input mode With this scheme the ADC data is interpreted as a 12 bit two s complement number with a range of 2 048 to 2 047 The ADC output is then sign extended to 16 bits causing either a leading 0 or a leading F hex to be added depending on the coding and the
19. an interval scanning DAQ operation The scan interval and the sample interval are being timed externally through OUTB 1 and EXTCONV Channels 1 and 0 of the input multiplexers are scanned once during each scan interval The first rising edge of EXTCONV must occur a minimum of 50 ns after the rising edge on OUTBI The first rising edge of EXTCONV after the rising edge of OUTBI enables an internal GATE signal that allows conversions to occur The first conversion then occurs on the following falling edge of EXTCONV The GATE signal disables conversions for the rest of the scan interval after the desired channels have been scanned Refer to the Interval Scanning Acquisition Mode section in Chapter 4 Theory of Operation for more information on interval scanning National Instruments Corporation 3 21 PCI 1200 User Manual Chapter 3 Signal Connections OUTB1 EXTCONV CONVERT GATE ADC CH lt ty 50ns 1 1 i ty 50ns van Pu wy wa lg lw ge ye el PCI 1200 User Manual Figure 3 12 Interval Scanning Signal Timing You use the final external control signal EXTUPDATE to externally control updating the output voltage of the 12 bit DACs and or to generate an externally timed interrupt There are two update modes immediate update and delayed update In immediate update mode the analog output is updated as soon as a value is written to the DAC If y
20. ease of use and low level DAQ I O functions for maximum flexibility and performance Examples of high level functions are streaming data to disk or acquiring a certain number of data points An example of a low level function is writing directly to registers on the DAQ device NI DAQ does not sacrifice the performance of National Instruments DAQ devices because it lets multiple devices operate at their peak performance NI DAQ also internally addresses many of the complex issues between the computer and the DAQ hardware such as programming interrupts and DMA controllers NI DAQ maintains a consistent software interface among its different versions so that you can change platforms with National Instruments Corporation 1 3 PCI 1200 User Manual Chapter 1 Introduction minimal modifications to your code Whether you are using conventional programming languages LabVIEW LabWindows CVI or other application software your application uses the NI DAQ driver software as illustrated in Figure 1 1 Conventional ComponentWorks Programming Environment LabVIEW LabWindows CVI or VirtualBench NI DAQ Driver Software Personal ae or lt lt Computer or ardware Workstation Figure 1 1 The Relationship between the Programming Environment NI DAQ and Your Hardware Register Level Programming PCI 1200 User Manual The final option for programming any National Instruments
21. 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 to 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 PCI 1200 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 add
22. 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 This icon to the left of bold italicized text denotes a warning which advises you of precautions to take to avoid being electrically shocked Bold text denotes the names of menus menu items or dialog box buttons or options Bold italic text denotes a note caution or warning Italic text denotes variables emphasis a cross reference or an introduction to a key concept Macintosh refers to all Macintosh computers with PCI bus unless otherwise noted Text in this font denotes text or characters that you should literally enter from the keyboard sections of code programming examples and syntax examples This font is also used for the proper names of disk drives paths directories programs subprograms subroutines device names functions operations variables filenames and extensions and for statements and comments taken from programs PC refers to all IBM PC XT PC AT and compatible computers with PCI bus unless otherwise noted NI DAQ is used in this manual to refer to the NI DAQ software for PC or Macintosh computers unless otherwise noted SCXI stands for Signal Conditioning eXtensions for Instrumentation and is a National Instruments product line designed to perform front end signal conditioning for National Instruments plug in DAQ boards X National Instruments Co
23. indicates that the data written from the specified port has been accepted This signal is primarily a response from the external device that it has received the data from the PCI 1200 OBF Output Output Buffer Full A low signal on this handshaking line indicates that data has been written from the specified port INTR Output Interrupt Request This signal becomes high when the 82C55A is requesting service during a data transfer Set the appropriate interrupt enable signals to generate this signal RD Internal Read Signal This signal is the read signal generated from the PCI interface circuitry WRIT Internal Write Signal This signal is the write signal generated from the PCI interface circuitry DATA Bidirectional Data Lines at the Specified Port This signal indicates when the data on the data lines at a specified port is or should be available National Instruments Corporation 3 27 PCI 1200 User Manual Chapter 3 Signal Connections Mode 1 Input Timing The timing specifications for an input transfer in mode 1 are as follows i T1 i it E 1724 1 T4 4 lt gt lt _ gt STB IBF a 3 1 T6 1 e 4 INTR 3 gt T3 gt lt T5 gi DATA Name Description Minimum Maximum Tl STB pulse width 500 T2 STB 0 to IBF 1 300 T3 Data before STB 1 0 T4 STB 1 to INTR 1 300 T5 Data after STB 1
24. is no missing codes and that no code width exceeds 2 LSBs PCI 1200 User Manual A 4 National Instruments Corporation Appendix A Specifications System noise is the amount of noise seen by the ADC when there is no signal present at the input of the board The amount of noise that is reported directly without any analysis by the ADC is not necessarily the amount of real noise present in the system unless the noise is considerably greater than 0 5 LSB rms Noise that is less than this magnitude produces varying amounts of flicker and the amount of flicker seen is a function of how near the real mean of the noise is to a code transition If the mean is near or at a transition between codes the ADC flickers evenly between the two codes and the noise is very near 0 5 LSB If the mean is near the center of a code and the noise is relatively small very little or no flicker is seen and the noise is reported by the ADC as nearly 0 LSB From the relationship between the mean of the noise and the measured rms magnitude of the noise the character of the noise can be determined National Instruments has determined that the character of the noise in the PCI 1200 is fairly Gaussian so the noise specifications given are the amounts of pure Gaussian noise required to produce our readings Explanation of Dither The dither circuitry when enabled adds approximately 0 5 LSB rms of white Gaussian noise to the signal to be converted to the ADC This
25. it is worthwhile to look through the software documentation before you configure your hardware Accessory installation guides or manuals If you are using accessory products read the terminal block and cable assembly installation guides and accessory board user manuals They explain how to physically connect the relevant pieces of the system Consult these guides when you are making your connections SCXI Chassis Manual If you are using SCXI read this manual for maintenance information on the chassis and installation instructions xi PCI 1200 User Manual About This Manual Related Documentation The following National Instruments document contains information that you may find helpful as you read this manual e Application Note 025 Field Wiring and Noise Considerations for Analog Signals The following documents also contain information that you may find helpful as you read this manual e Dither in Digital Audio by John Vanderkooy and Stanley P Lipshitz Journal of the Audio Engineering Society Vol 35 No 12 December 1987 e PCI Local Bus Specification Revision 2 0 e Your computer s technical reference manual The following National Instruments document contains detailed information for the register level programmer e PCI 1200 Register Level Programmer Manual This manual is available from National Instruments by request If you are using NI DAQ LabVIEW LabWindows CVI or other application softw
26. low level minimum pulse width output delay from gate output delay from clock clock high level clock low level transistor transistor logic typical National Instruments Corporation G 7 PCI 1200 User Manual Glossary WRT PCI 1200 User Manual volts positive negative input voltage common mode noise volts direct current differential input voltage external voltage virtual instrument 1 a combination of hardware and or software elements typically used with a PC that has the functionality of a classic stand alone instrument 2 a LabVIEW software module VI which consists of a front panel user interface and a block diagram program volts input high volts input low measured voltage volts root mean square signal source watts write signal G 8 National Instruments Corporation Index A ACH lt 7 0 gt signal definition table 3 3 input ranges table bipolar analog input 3 5 unipolar analog input 3 5 to 3 6 ACK signal table 3 27 A D FIFO 4 7 AGND signal table 3 3 AISENSE AIGND signal analog common signal 3 5 definition table 3 3 analog input circuitry 4 6 to 4 7 illustration 4 5 configuration See analog input configuration DAQ operations 4 7 to 4 9 controlled acquisition mode 4 8 freerun acquisition mode 4 8 interval scanning acquisition mode 4 8 to 4 9 multiple channel scanned data acquisition 4 9 single channel data acquisition 4 9 DAQ rates 4 10
27. or a bipolar voltage output range A unipolar output gives an output voltage range of 0 0000 to 9 9976 V A bipolar output gives an output voltage range of 5 0000 to 4 9976 V For unipolar output 0 0000 V output corresponds to a digital code word of 0 For bipolar output 5 0000 V output corresponds to a digital code word of F800 hex One LSB is the National Instruments Corporation PCI 1200 User Manual Chapter 4 Theory of Operation DAC Timing Digital 1 0 voltage increment corresponding to an LSB change in the digital code word For both outputs 10V LSB es 4 095 There are two modes in which you can update the DAC voltages In immediate update mode the DAC output voltage is updated as soon as you write to the corresponding DAC In delayed update mode the DAC output voltage does not change until a low level is detected either from counter A2 of the timing circuitry or EXTUPDATE This mode is useful for waveform generation These two modes are software selectable The digital I O circuitry has an 82C55A integrated circuit The 82C55A is a general purpose programmable peripheral interface containing 24 programmable I O pins These pins represent the three 8 bit I O ports A B and C of the 82C55A as well as PA lt 0 7 gt PB lt 0 7 gt and PC lt 0 7 gt on the PCI 1200 I O connector Figure 4 6 shows the digital I O circuitry PCI Bus Data Address 37 Interface Control
28. our 40 HA our 2 5 mA 4 2 V 3 7 V Power on state cccceccccecessseseeesesereeees Protection ssesesesesssserereerrrerrsrsrsssesserrere Data transfers cccccccccccceseeeseeeserereeees Number of channels cccc0eeseseeeeees All ports mode 0 input 0 5 to 5 5 V powered on 0 5 V powered off Interrupts programmed I O 3 counter timers Protection 5 ecg eae Av in eet 0 5 to 5 5 V powered on 0 5 V powered off Resolution Counter timers 0 eee ee eeeereeeees 16 bits Compatibility 0 eeeeeeeeees TTL Base clock available 0 0 eee 2 MHz Base clock accuracy 50 ppm max Max source frequency eee 8 MHz Min source pulse duration 0 0 125 ns Min gate pulse duration 50 ns Digital logic levels Level Min Max Input low voltage 0 3 V 0 8 V Input high voltage 2 2V 5 3 V A 8 National Instruments Corporation Bus Interface Appendix A Specifications Level Min Max Output low voltage Wout 2 1 mA 0 45 V Output high voltage our 0 92 mA 3 7 V PLrOteChON eea aa 0 5 to 5 5 V powered on 0 5 V powered off D ta transfeticorie nominent Interrupts programmed I O Digital Trigger Compatibility sseseseseeeeseeeeeerereereeeeresesee TTL RESPODSE isson nen Rising edge P lse widths a 50 ns min Type eee E atone R eae Slave Power Requirement Physical Environ
29. recommended DAQ rates in Table 4 2 assume that voltage levels on all the channels included in the scan sequence are within range for the given gain and are driven by low impedance sources PCI Bus Data Address 37 Interface Control 6 Error Reporting 2 Arbitration 2 System 2 Interrupt 1 MITE PCI Interface Chip The PCI 1200 has two channels of 12 bit D A output Each analog output channel can provide unipolar or bipolar output The PCI 1200 also contains timing circuitry for waveform generation timed either externally or internally Figure 4 5 shows the analog output circuitry gt e 10 V Internal v Address 5 Data 8 Control 4 Interrupt 4 Digital Control Logic Two s Complement Counter DACOWRT gt Data 8 A2 DAC1WRT al DACO Reference External Update DACOOUT AGND EXTUPDATE gt Two s Complement gt DAC1 1 O Connector DAC10UT Analog Output Circuitry Figure 4 5 Analog Output Circuitry Each analog output channel contains a 12 bit DAC The DAC in each analog output channel generates a voltage proportional to the 10 V internal reference multiplied by the 12 bit digital code loaded into the DAC The voltage output from the two DACs is available at the DACOOUT and DACIOUT pins You can program each DAC channel for a unipolar voltage output
30. scan interval LabVIEW LabWindows CVI other application software and NI DAQ support only multichannel interval scanning Single channel interval scanning is available only through register level programming Refer to the PCI 1200 Register Level Programming Manual for more information on single channel interval scanning Because interval scanning allows you to specify how frequently scan sequences are executed it is useful for applications in which you need to sample data at regular but relatively infrequent intervals For example to sample channel 1 wait 12 us then sample channel 0 and if you want to 4 8 National Instruments Corporation Chapter 4 Theory of Operation repeat this process every 65 ms then you should define the operation as follows e Start channel ch1 which gives a scan sequence of ch1 ch0 e Sample interval 12 us e Scan interval 65 ms The first channel will not be sampled until one sample interval from the scan interval pulse Since the A D conversion time is 10 us your sample interval must be at least this value to ensure proper operation Single Channel Data Acquisition The PCI 1200 executes a single channel analog input operation by performing an A D conversion on a specified analog input channel every sample interval The sample interval is the amount of time that elapses between successive A D conversions The sample interval is controlled either externally by EXTCONV or internally by co
31. to 4 11 maximum recommended rates table 4 10 settling time vs gain table 4 10 input modes See analog input modes polarity configuration 2 3 settings table 2 2 signal connections See analog input signal connections specifications A 1 to A 6 theory of operation 4 5 to 4 11 National Instruments Corporation analog input configuration 2 2 to 2 5 analog I O settings table 2 2 differential connections purpose and use 3 9 recommended input configurations table 3 8 floating signal sources differential connections 3 11 to 3 12 recommended input configurations table 3 8 ground referenced signal sources differential connections 3 10 recommended input configurations table 3 8 input modes 2 3 to 2 5 input polarity 2 3 analog input modes 2 3 to 2 5 DIFF See also differential connections definition table 2 4 purpose and use 2 5 recommended input configurations table 3 8 NRSE definition table 2 4 purpose and use 2 4 to 2 5 recommended input configurations table 3 8 single ended connections for ground referenced signal sources 3 13 to 3 14 RSE definition table 2 4 purpose and use 2 4 recommended input configurations table 3 8 single ended connections for floating signal sources 3 13 l 1 PCI 1200 User Manual Index analog input signal connections bipolar signal range vs gain table 3 5 common mode signal rejection 3 14 to 3 15 differential connections float
32. 10 Differential Connections for Floating Signal Sources 3 11 Single Ended Connection Considerations 3 12 Single Ended Connections for Floating Signal Sources RSE Configuration ceeceeccesceseceseeesseeeareeseeeeeeesaes 3 13 Single Ended Connections for Grounded Signal Sources NRSE Configuration ceeesscecesereeeseeeeneeeseeeneeeeees 3 13 Common Mode Signal Rejection Considerations 3 14 Analog Output Signal Connections ec eecceseeeeeseceeeeseeseeeseesseeaeeeseeaeenes 3 15 Digital I O Signal Connections 20 0 eee eceessceeecseeesececeseeseesseeseeseseeeneeaes 3 16 Logical Inputs and Outputs eee cece eee eseceeeeeensesseeenesseeenees 3 17 Port C Pin Connections ossis isisisi ss sessteanscasastesed asepoasess 3 18 Power Connections cic scares pedis aden bits dues e a a EA RE 3 18 DAQ and General Purpose Timing Signal Connections 0 eee eee 3 18 DAQ Timing Connections esssesesessessssrssrsrsersrestrresresrerrsreserersresese 3 19 General Purpose Timing Signal ConnectionSs esseeeeserserereeeereee 3 23 Timing Specifications isise seien ii 3 27 Mode 1 Input Timing snsc a 3 28 Mode 1 Output Timing sseseseesesessesreerssesrtsreersresreresresreresresessesreetse 3 29 Mode 2 Bidirectional Timing 00 eee ee eeceeeeeseceseceeeeseeneeeseeeneeaes 3 30 Chapter 4 Theory of Operation Bunctronal Overviews io cecc ccd ss cud ectectes ice tecevtyecedon Gating dest bacencev EN E TN tana a 4 1
33. 2 PC4 PC6 EXTTRIG EXTCONV GATBO GATB1 OUTB2 CLKB2 DGND Figure 3 1 PCI 1200 I O Connector Pin Assignments Descriptions The following table describes the connector pins on the PCI 1200 I O connector by pin number and gives the signal name and description of each signal connector pin 3 2 National Instruments Corporation Table 3 1 Chapter 3 Signal Descriptions for PCI 1200 1 0 Connector Pins Pin Signal Name Direction Reference Description 1 8 ACH lt 7 0 gt Al AGND Analog Channel 7 through 0O Analog input channels 0 through 7 AISENSE AIGND T O AGND Analog Input Sense Analog Input Ground Connected to AGND in RSE mode analog input sense in NRSE mode 10 DACOOUT AO AGND Digital to Analog Converter 0 Output Voltage output signal for analog output channel 0 11 12 AGND DACI1OUT N A AO N A AGND Analog Ground Analog output ground reference for analog output voltages Bias current return point for differential measurements Digital to Analog Converter 1 Output Voltage output signal for analog output channel 1 13 DGND N A N A Digital Ground Voltage ground reference for the digital signals and the 5 V supply 14 21 PA lt 7 0 gt DIO DGND Port A 7 through 0O Bidirectional data lines for port A PA7 is the MSB and PAO is the LSB 22 29 PB lt 7 0 gt DI
34. 78730 5039 Glossary Prefix Meanings Value p pico 10 2 n nano 10 u micro 10 6 m milli 10 3 k kilo 103 M mega 106 G giga 10 Numbers Symbols j degrees gt greater than gt greater than or equal to lt less than negative of or minus not equal to Q ohms percent plus or minus positive of or plus 5 V 5 Volts signal National Instruments Corporation G 1 PCI 1200 User Manual Glossary A AC ACH lt 0 7 gt ACK A D ADC AGND Al AISENSE AIGND ANSI AO AWG C C CALDAC CH CLKB1 CLKB2 cm CMRR CNTINT PCI 1200 User Manual amperes alternating current analog channel 0 through 7 signals acknowledge input signal analog to digital analog to digital converter an electronic device often an integrated circuit that converts an analog voltage to a digital number analog ground signal analog input analog input sense analog input ground signal American National Standards Institute analog output American Wire Gauge Celsius calibration digital to analog converter channel counter B1 B2 clock signals centimeters common mode rejection ratio a measure of an instrument s ability to reject interference from a common mode signal usually expressed in decibels dB counter interrupt signal G 2 National Instruments Corporation D A DAC DAC OUTPUT UPDATE DACOOUT DACIOUT DACWRT
35. DAQ PCI 1200 User Manual Multifunctional 1 0 Board for PCI Bus Computers Sr NATIONAL i July 1998 Editi gt INSTRUMENTS Part me hie 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 Headquarters 6504 Bridge Point Parkway Austin Texas 78730 5039 USA Tel 512 794 0100 Copyright 1996 1998 National Instruments Corporation All rights reserved Important Information Warranty Copyright Trademarks The PCI 1200 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
36. O DGND Port B 7 through O Bidirectional data lines for port B PB7 is the MSB and PBO is the LSB 30 37 PC lt 7 0 gt DIO DGND Port C 7 through 0O Bidirectional data lines for port C PC7 is the MSB and PCO is the LSB 38 EXTTRIG DI DGND External Trigger External control signal to trigger a DAQ operation 39 EXTUPDATE DI DGND External Update External control signal to update DAC outputs National Instruments Corporation 3 3 PCI 1200 User Manual Signal Connections Chapter 3 Signal Connections Table 3 1 Signal Descriptions for PCI 1200 1 0 Connector Pins Continued Pin Signal Name Direction Reference Description 40 EXTCONV DIO DGND External Convert External control signal to time A D conversions DI and drive SCANCLK when you use SCXI DO 41 OUTBO DO DGND Output BO Digital output signal of counter BO 42 GATBO DI DGND Gate BO External control signal for gating counter BO 43 OUTBI DIO DGND Output B1 Digital output signal of counter B1 DO External control signal for timing a scan interval DI 44 GATB1 DI DGND Gate B1 External control signal for gating counter B1 45 CLKB1 DI DGND Clock B1 External control clock signal for counter B1 46 OUTB2 DO DGND Counter B2 Digital output signal of counter B2 47 GATB2 DI DGND Gate B2 External control signal for gating count
37. OUTB1 Data Address Address iai gt gt OUTBO OUTBO i 3 GATEBO 4 GATEBO Interface Control Data 4 7 Digital Timebase Error Ra ortin i enra Extension p porti ral MITE Control Logic General A PCI 4 Purpose Arbitration Interface Interrupt Counter P Chip 2 MHz 5 a 2 CLKBO 4 Source 8 rat System La g A a CLKAO 82C53 Counter Timer 2 1 GATEAO Group B o Interrupt Q Sample 1 Interval Counter OUTAO OUTB1 CLKA1 a EXTCONV Sample li Counter A D Conversion Logic GATEA1 ja OUTA1 EXTTRIG CLKA2 ja 5v GATEA2 mwm DAC EXTUPDATE Timing y OUTA2 D AConversion Logic 82C53 Counter Timer Group A PCI 1200 User Manual Each 82C53 contains three independent 16 bit counter timers and one 8 bit Figure 4 3 Timing Circuitry mode register Each counter has a CLK input pin a GATE input pin and an OUT output pin You can program all six counter timers to operate in several useful timing modes The first group of counter timers is called group A and includes AO A1 and A2 You can use these three counters for internal DAQ and DAC 4 4 National Instruments Corporation Analog Input Chapter 4 Theory of Operation timing or you can use the three external timing signals EXTCONV EXTTRIG and EXTUPDATE for DAQ and DAC timing The second group of counter timers is called group B and includes BO B1 and B2 You can use counters BO and B1 for internal DAQ and DAC t
38. PCI 1200 Block Diagram The major components of the PCI 1200 are as follows MITE PCT interface circuitry Timing circuitry Analog input circuitry Analog output circuitry 4 1 PCI 1200 User Manual Chapter 4 Theory of Operation e Digital I O circuitry e Calibration circuitry The internal data and control buses interconnect the components The rest of this chapter explains the theory of operation of each of the PCI 1200 components Calibration circuitry is discussed in Chapter 5 Calibration PCI Interface Circuitry PCI 1200 User Manual The PCI 1200 interface circuitry consists of the MITE PCI interface chip and a digital control logic chip The MITE PCI interface chip provides a mechanism for the PCI 1200 to communicate with the PCI bus It is an Application Specific Integrated Circuit ASIC designed by National Instruments specifically for data acquisition The digital control logic chip connects the MITE PCI interface chip with the rest of the board The PCI 1200 is fully compliant with PCI Local Bus Specification Revision 2 0 Therefore the base memory address and interrupt level for the board are stored inside the MITE PCI interface chip at power on You do not need to set any switches or jumpers The PCI bus is capable of 8 bit 16 bit or 32 bit transfers but the PCI 1200 uses only 8 bit transfers Data Address Address 37 5 Interface Control Data 7 Digital 6 8 Control Error Reporting
39. PCI 1200 User Manual Signal Connections This chapter describes how to make input and output signal connections to the PCI 1200 board via the board I O connector and details the I O timing specifications The I O connector for the PCI 1200 has 50 pins that you can connect to 50 pin accessories 1 0 Connector Figure 3 1 shows the pin assignments for the PCI 1200 I O connector Caution Connections that exceed any of the maximum ratings of input or output signals on the PCI 1200 may damage the PCI 1200 and the computer This includes connecting any power signals to ground and vice versa You should not externally drive digital I O lines while the computer is powered off doing so can damage the computer National Instruments is not liable for any damages resulting from signal connections that exceed these maximum ratings National Instruments Corporation 3 1 PCI 1200 User Manual Chapter 3 Signal Connections Signal Connection PCI 1200 User Manual ACHO ACH2 ACH4 ACH6 AISENSE AIGND AGND DGND PA1 PA3 PA5 PA7 PB1 PB3 PB5 PB7 PC1 PC3 PC5 PC7 EXTUPDATE OUTBO OUTB1 CLKB1 GATB2 5 V O AJN 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 ACH1 ACH3 ACH5 ACH7 DACOOUT DAC10UT PAO PA2 PA4 PA6 PBO PB2 PB4 PB6 PCO PC
40. PCI 1200 User Manual Chapter 2 Installation and Configuration PCI 1200 User Manual Table 2 2 Analog Input Modes for the PCI 1200 Analog Input Modes Description RSE RSE mode provides eight single ended inputs with the negative input of the instrumentation amplifier referenced to analog ground reset condition NRSE NRSE mode provides eight single ended inputs with the negative input of the instrumentation amplifier tied to AISENSE AIGND and not connected to ground DIFF DIFF mode provides four differential inputs with the positive input of the instrumentation amplifier tied to channels 0 2 4 or 6 and the negative input tied to channels 1 3 5 or 7 respectively thus choosing channel pairs 0 1 2 3 4 5 or 6 7 While reading the following paragraphs you may find it helpful to refer to the Analog Input Signal Connections section of Chapter 3 Signal Connections which contains diagrams showing the signal paths for the three configurations RSE Input Eight Channels Reset Condition RSE input means that all input signals are referenced to a common ground point that is also tied to the PCI 1200 analog input ground The differential amplifier negative input is tied to analog ground The RSE configuration is useful for measuring floating signal sources With this input configuration the PCI 1200 can monitor eight different analog input channels Considerations for using the RSE configur
41. Q board to acquire a programmed number of samples after trigger conditions are met posttrigger mode programmable peripheral interface parts per million pretrigger mode the technique used on a DAQ board to keep a continuous buffer filled with data so that when the trigger conditions are met the sample includes the data leading up to the trigger condition read signal external resistance root mean square referenced single ended mode all measurements are made with respect to a common reference measurement system or a ground Also called a grounded measurement system seconds G 6 National Instruments Corporation scan SCXI signal conditioning STB ta tgh tgsu gwh tewl oute toutg pwh pwl TTL typ samples Glossary one or more analog or digital input samples Typically the number of input samples in a scan is equal to the number of channels in the input group For example one pulse from the scan clock produces one scan which acquires one new sample from every analog input channel in the group Signal Conditioning eXtensions for Instrumentation the National Instruments product line for conditioning low level signals within an external chassis near sensors so only high level signals are sent to DAQ boards in the noisy PC environment the manipulation of signals to prepare them for digitizing strobe input signal minimum period gate hold time gate setup time gate high level gate
42. T is the voltage output signal for analog output channel 1 Pin 11 AGND is the ground reference point for both analog output channels as well as analog input The following output ranges are available e Bipolar output 5 V e Unipolar output 0 to 10 V Maximum load current 2 mA for 12 bit linearity National Instruments Corporation 3 15 PCI 1200 User Manual Chapter 3 Signal Connections Figure 3 7 shows how to make analog output signal connections 10 DACOOUT O Channel 0 Load VOUT 0 11 AGND Load VOUT 1 12 DAC10UT O Channel 1 Analog Output Channels 1 O Connector PCI 1200 Figure 3 7 Analog Output Signal Connections Digital 1 0 Signal Connections Pins 13 through 37 of the I O connector are digital I O signal pins Digital T O on the PCI 1200 uses the 82C55A integrated circuit The 82C55A is a general purpose peripheral interface containing 24 programmable I O pins These pins represent the three 8 bit ports PA PB and PC of the 82C55A Pins 14 through 21 are connected to the digital lines PA lt 7 0 gt for digital T O port A Pins 22 through 29 are connected to the digital lines PB lt 7 0 gt for digital I O port B Pins 30 through 37 are connected to the digital lines PC lt 7 0 gt for digital I O port C Pin 13 DGND is the digital ground pin for all three digital I O ports Refer to Appendix A Specifications for sign
43. V powered on 25 V powered off Inputs protected eee ACH lt 0 7 gt PIFO buffer SiZ rror tare Antec 4 096 samples Data tramsfers iien nesenie DMA interrupts programmed I O DMA Modes iia scant eelecion Scatter gather DUBE airna sananen Available Transfer Characteristics Relative accuracy 0 5 LSB typ dithered 1 5 LSB max undithered DNL aiea uun oa aa Aaa 1 LSB max No missing COdES eeeeeeeeeeeteeeeeeeeeeeees 12 bits guaranteed Offset error Pregain error after calibration Pregain error before calibration Postgain error after calibration Postgain error before calibration After calibration Before calibration cccccceeeeeees 10 uV max 20 mV max 1 mV max 200 mV max Gain error relative to calibration reference 0 02 of reading max 2 of reading max Amplifier Characteristics Input impedance Normal powered ono eee 100 GQ in parallel with 50 pF A 2 National Instruments Corporation Appendix A Specifications Powered Off cccccescesseeseeeeeteeeeees 4 7 kQ min Overloads aonya 4 7 kQ min Input bias current 0 eects 100 pA Input offset current eee 100 pA CMRR ie ponete geaten ensest i aiaidedes 70 dB DC to 60 Hz Dynamic Characteristics Bandwidth Small signal 3 dB Gain Bandwidth 1 10 250 kHz 20 150 kHz 50 60 kHz 100 30 kHz Settling time for full scale step
44. able gain amplifier After the input multiplexers are switched the amplifier must be allowed to settle to the new input signal value to within 12 bit accuracy before you perform an A D conversion or 12 bit accuracy will not be achieved The settling time is a function of the gain selected Table 4 1 shows the recommended settling time for each gain setting during multichannel scanning Table 4 2 shows the maximum recommended DAQ rates for both single channel and multichannel data acquisition For single channel scanning this rate is limited only by the ADC conversion period plus the sample and hold acquisition time specified at 10 us For multichannel data acquisition observing the DAQ rates in Table 4 2 ensures 12 bit resolution The hardware is capable of multiple scanning at higher rates than those listed in Table 4 2 but 12 bit resolution is not guaranteed Table 4 1 Analog Input Settling Time Versus Gain Settling Time Gain Accuracy 0 024 1 LSB 1 10 us typ 14 us max 2 10 13 us typ 16 us max 20 15 us typ 19 us max 50 27 us typ 34 us max 100 60 us typ 80 us max Table 4 2 PCI 1200 Maximum Recommended DAQ Rates Acquisition Mode Gain Rate Single channel 1 2 5 10 20 50 100 100 kS s Multichannel 1 100 kS s 2 5 10 77 kS s 20 66 6 kS s 50 37 kS s 100 16 6 kS s 4 10 National Instruments Corporation Analog Output Chapter 4 Theory of Operation The
45. addition is useful for applications involving averaging to increase the resolution of the PCI 1200 to more than 12 bits as in calibration In such applications which are often lower frequency in nature noise modulation is decreased and differential linearity is improved by the addition of dither For high speed 12 bit applications not involving averaging dither should be disabled because it only adds noise When taking DC measurements such as when calibrating the board enable dither and average about 1 000 points to take a single reading This process removes the effects of 12 bit quantization and reduces measurement noise resulting in improved resolution Dither or additive white noise has the effect of forcing quantization noise to become a zero mean random variable rather than a deterministic function of input For more information on the effects of dither see Dither in Digital Audio by John Vanderkooy and Stanley P Lipshitz Journal of the Audio Engineering Society Vol 35 No 12 Dec 1987 Explanation of DAQ Rates Maximum DAQ rates number of S s are determined by the conversion period of the ADC plus the sample and hold acquisition time which is specified at 10 us During multichannel scanning the DAQ rates are further limited by the settling time of the input multiplexers and programmable National Instruments Corporation A 5 PCI 1200 User Manual Appendix A Specifications Analog Output PCI 1200 User Manual
46. al voltage and current specifications The following specifications and ratings apply to the digital I O lines All voltages are with respect to DGND PCI 1200 User Manual 3 16 National Instruments Corporation Chapter 3 Signal Connections Logical Inputs and Outputs e Absolute max voltage rating 0 5 to 5 5 V with respect to DGND e Digital I O lines Input logic low voltage 0 3 V min 0 8 V max Input logic high voltage 2 2 V min 5 3 V max Output logic low voltage 0 4 V max at output current 2 5 mA Output logic high voltage 3 7 V min at output current 2 5 mA Input leakage current 1 pA min 1 uA max 0 lt Vi lt 5 V Figure 3 8 illustrates signal connections for three typical digital I O applications 5 V LED a MZ 14 PAO PortA WV O PA lt 7 0 gt Do 22 PBO Port B TTL Signal PB lt 7 0 gt BV 4w 30 PCO Port C I PC lt 7 0 gt Ye V es DGND 1 0 Connector PCI 1200 Figure 3 8 Digital 1 0 Connections In Figure 3 8 port A is configured for digital output and ports B and C are configured for digital input Digital input applications include receiving TTL signals and sensing external device states such as the switch in National Instruments Corporation 3 17 PCI 1200 User Manual Chapter 3 Signal Connections Figure 3 8 Digital output applications include sending TTL signals and driving e
47. are you should not need the register level programmer manual Using NI DAQ LabVIEW LabWindows CVI or other application software is easier than and as flexible as using the low level programming described in the register level programmer manual Refer to the Software Programming Choices section in Chapter 1 Introduction of this manual to learn about your programming options Customer Communication PCI 1200 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 end of this manual xii National Instruments Corporation Introduction This chapter describes the PCI 1200 lists what you need to get started software programming choices and optional equipment and explains how to build custom cables and unpack the PCI 1200 About the PCI 1200 Thank you for purchasing the PCI 1200 a low cost high performance multifunction analog digital and timing board for PCI bus computers The PCI 1200 has eight analog input channels that you can configure as eight single ended or four differential inputs a 12 bit successive approximation ADC two 12 bit DACs with voltage outputs 24 lines of TTL compatible digi
48. arth ground In this case treat all of your signal sources as floating sources Input Configurations You can configure the PCI 1200 for one of three input modes RSE NRSE or DIFF The following sections discuss the use of single ended and differential measurements and considerations for measuring both floating National Instruments Corporation 3 7 PCI 1200 User Manual Chapter 3 Signal Connections and ground referenced signal sources Table 3 4 summarizes the recommended input configurations for both types of signal sources Table 3 4 Summary of Analog Input Connections Signal Source Type Floating Signal Source Grounded Signal Source Not Connected to Building Ground Examples Examples e Ungrounded Thermocouples e Plug in instruments with e Signal conditioning with isolated outputs nonisolated outputs e Battery devices AIGND Differential DIFF See text for information on bias resistors NOT RECOMMENDED Single Ended Ground Referenced RSE Ground loop losses Vg are added to measured signal Nonreferenced NRSE See text for information on bias resistors PCI 1200 User Manual National Instruments Corporation Chapter 3 Signal Connections Differential Connection Considerations DIFF Configuration Differential connections are those in which each PCI 1200 analog input signal has its own reference signal or signal return path These connections are available w
49. at the analog output In addition you can select the coding scheme for each D A converter DAC as either two s complement or straight binary If you select a bipolar range for a DAC the two s complement coding is recommended In this mode data values written to the analog output channel range from F800 hex 2 048 decimal to TFF hex 2 047 decimal If you select a unipolar range for a DAC the straight binary coding is recommended In this mode data values written to the analog output channel range from 0 to FFF hex 4 095 decimal Analog Input Polarity You can select the analog input on the PCI 1200 for either a unipolar range 0 to 10 V or a bipolar range 5 to 5 V In addition you can select the coding scheme for analog input as either two s complement or straight binary If you select a bipolar range the two s complement coding is recommended In this mode 5 V input corresponds to F800 hex 2 048 decimal and 5 V corresponds to 7FF hex 2 047 decimal If you select a unipolar mode the straight binary coding is recommended In this mode 0 V input corresponds to 0 hex and 10 V corresponds to FFF hex 4 095 decimal Analog Input Mode The PCI 1200 has three different input modes RSE input NRSE input and DIFF input The single ended input configurations use eight channels The DIFF input configuration uses four channels Table 2 2 describes these configurations National Instruments Corporation 2 3
50. ation are discussed in Chapter 3 Signal Connections Notice that in this mode the signal return path is analog ground at the connector through the AISENSE AIGND pin NRSE Input Eight Channels NRSE input means that all input signals are referenced to the same common mode voltage which floats with respect to the PCI 1200 analog ground This common mode voltage is subsequently subtracted by the input instrumentation amplifier The NRSE configuration is useful for measuring ground referenced signal sources 2 4 National Instruments Corporation Chapter 2 Installation and Configuration Considerations for using the NRSE configuration are discussed in Chapter 3 Signal Connections Notice that in this mode the signal return path is through the negative terminal of the amplifier at the connector through the AISENSE AIGND pin DIFF Input Four Channels DIFF input means that each input signal has its own reference and the difference between each signal and its reference is measured The signal and its reference are each assigned an input channel With this input configuration the PCI 1200 can monitor four differential analog input signals Considerations for using the DIFF configuration are discussed in Chapter 3 Signal Connections Notice that the signal return path is through the amplifier s negative terminal and through channel 1 3 5 or 7 depending on which channel pair you select National Instruments Corporation 2 5
51. ations Appendix B Customer Communication Glossary Index Figures Figure 1 1 The Relationship between the Programming Environment NI DAQ and Your Hardware c cccccccssssccceesssssceceeessseceeeeessseeeeeeeeeas 1 4 Figure 3 1 PCI 1200 I O Connector Pin Assignments essesseesseererrersresresrrsrereses 3 2 Figure 3 2 PCI 1200 Instrumentation Amplifier eee eee eeeeeeseeeeeeeeeeees 3 6 Figure 3 3 Differential Input Connections for Grounded Signal Sources 3 10 Figure 3 4 Differential Input Connections for Floating Sources eee 3 11 Figure 3 5 Single Ended Input Connections for Floating Signal Sources 3 13 Figure 3 6 Single Ended Input Connections for Grounded Signal Sources 3 14 Figure 3 7 Analog Output Signal Connections 0 0 ee eceseeeeeeeeeeneeeeeeeeeees 3 16 Figure 3 8 Digital I O Connections eee eeeeeeeseesceeseceseeaeeeseeaeeeeseseeeeseesaes 3 17 Figure 3 9 EXTCONV Signal Timing eee cee ceseereceseeseeneeeseeeeeeeesees 3 19 Figure 3 10 Posttrigger DAQ Timing oo eee eee eseeeceeseeeseeaeeeseeaeeneesseeeeeeeeeaes 3 20 Figure 3 11 Pretrigger DAQ Timing nin kaau anes 3 21 Figure 3 12 Interval Scanning Signal Timing 00 eee eee eeeeeeeeeeteeeeneeneeaes 3 22 Figure 3 13 EXTUPDATE Signal Timing for Updating DAC Output 3 23 Figure 3 14 Event Counting Application with External Switch Gating 3 24 Figure 3 15 Frequency Measurement Appli
52. cation eee eeeeeeeeeeeseeeeeeeeees 3 25 National Instruments Corporation vii PCI 1200 User Manual Contents Figure 3 16 General Purpose Timing Signals 0 ee ceeeeeeseeeseereceseeeeneeeseeeneeees 3 26 Figure 3 17 Mode 1 Timing Specifications for Input Transfers eee 3 28 Figure 3 18 Mode 1 Timing Specifications for Output Transfers 3 29 Figure 3 19 Mode 2 Timing Specifications for Bidirectional Transfers 3 30 Figure 4 1 PCI 1200 Block Diagram o00 eee eeceseeeeeeseeeseeeeeeecneenaeeeeeaes 4 1 Figure 4 2 PCI Interface Circus try isser ro eeaeee a Earp stasis a 4 2 Figure 4 3 Timing Circuitry esaiar cecceseceeeesecseeeseenecsecsaeeaeesseeseeeesseseatenes 4 4 Figure 4 4 Analog Input Circuitry 0 eee ccecsecesceeceeeeseeseecseesaecaeeeaeeseeaes 4 5 Figure 4 5 Analog Output Circuitry 0 eee eee cseceseesseeseeeseeseeeseceeeaeensseatenes 4 11 Figure 4 6 Digital VO Circuitry eee ccecseceseeeeeesecaeeeaeeseeesesseesaeeeseaeeaes 4 12 Tables Table 2 1 Analog WO Sen gsi sisszssecciccsatiseescisashanseasach slandisaseausyscvastoedesdegeaeyectilas 2 2 Table 2 2 Analog Input Modes for the PCI 1200 0 cee eee eesceeeseeeseeeenreeneeeneeenees 2 4 Table 3 1 Signal Descriptions for PCI 1200 I O Connector Pins eee 3 3 Table 3 2 Bipolar Analog Input Signal Range Versus Gain eee 3 5 Table 3 3 Unipolar Analog Input Signal Range Versus Gain eee 3 5 Table 3 4 Summary of Analog Input Connections 0
53. ceptable The inaccuracy of the calibration equipment results only in gain error offset error is unaffected Calibrate the PCI 1200 to a measurement accuracy of 0 5 LSBs which is within 0 012 of its input range For analog input calibration use a precision DC voltage source such as a calibrator with the following specifications e Voltage Oto l0V e Accuracy 0 001 standard 0 003 acceptable 5 2 National Instruments Corporation Chapter 5 Calibration Using the Calibration Function The Calibrate 1200 function and the 1200 Calibrate VI can either load the calibration DACs with the factory constants or the user defined constants stored in the EEPROM or you can perform your own calibration and directly load these constants into the calibration DACs To use the Calibrate 1200 function or the 1200 Calibrate VI for analog input calibration ground an analog input channel at the I O connector for offset calibration and apply an accurate voltage reference to another input channel for gain calibration You should first configure the ADC for RSE mode then for the correct polarity at which you want to perform data acquisition To use the Calibrate 1200 function or the 1200 Calibrate VI for analog output calibration the DACO and DAC1 outputs must be wrapped back and applied to two other analog input channels You should first configure the analog input circuitry for RSE and for bipolar polarity then configure the analog output cir
54. ctions 3 16 to 3 18 logical inputs and outputs 3 17 to 3 18 Port C pin connections 3 18 T O connector exceeding maximum ratings caution 3 1 pin assignments figure 3 2 power connections 3 18 signal descriptions table 3 3 to 3 4 single channel data acquisition 4 9 single ended connections floating signal sources RSE configuration 3 13 ground referenced signal sources NRSE configuration 3 13 to 3 14 purpose and use 3 12 when to use 3 12 software programming choices National Instruments application software 1 2 to 1 3 NI DAQ driver software 1 3 to 1 4 register level programming 1 4 specifications analog input A 1 to A 6 analog output A 6 to A 7 bus interface A 9 digital I O A 7 to A 8 environment A 9 physical A 9 power requirements A 9 timing I O A 8 to A 9 square wave generation 3 23 STB signal table 3 27 system noise A 5 National Instruments Corporation l 7 Index T technical support B 1 to B 2 theory of operation analog input 4 5 to 4 11 circuitry 4 6 to 4 7 illustration 4 5 DAQ rates 4 10 to 4 11 analog output 4 11 to 4 12 circuitry 4 11 to 4 12 illustration 4 11 DAC timing 4 12 block diagram of PCI 1200 4 1 digital I O 4 12 to 4 13 circuitry figure 4 12 functional overview 4 1 to 4 2 PCI interface circuitry 4 2 to 4 3 block diagram 4 2 timing 4 3 to 4 5 circuitry figure 4 4 time lapse measurement 3 24 timing circuitry illustration 4 4 theory of
55. cuitry for the polarity at which you want to perform output waveform generation Refer to your software documentation for more details on the Calibrate_1200 function and the 1200 Calibrate VI National Instruments Corporation 5 3 PCI 1200 User Manual Specifications Analog Input This appendix lists the PCI 1200 specifications These specifications are typical at 25 C unless otherwise stated Input Characteristics Number of channels Type oF ADC ee coven eos eet ties roseeys ech Resolution 200 cccccececeeeeseseseessersrenees Max sampling rate Input signal ranges Eight single ended eight pseudodifferential or four differential software selectable 100 kS s Successive approximation 12 bits 1 in 4 096 Input Coupling 0 ee eeeeeeeeeeesneeeneeeenees National Instruments Corporation A 1 Board Sain Ga nie Software Selectable 5 V 0to10V 1 5 V Oto 10 V 2 2 5 V O0to5 V 5 1 V 0to2V 10 500 mV Otol V 20 250 mV 0 to 500 mV 50 100 mV 0 to 200 mV 100 50 mV 0 to 100 mV DC PCI 1200 User Manual Appendix A Specifications PCI 1200 User Manual Max working voltage eee In DIFF or NRSE signal common mode cesses mode the negative input AISENSE should remain within 5 V of AGND bipolar or 5 to 2 V unipolar The positive input should remain within the 5 to 10 V range Overvoltage protection s es 35
56. e LabWindows CVI Data Acquisition Library a series of functions for using LabWindows CVI with National Instruments DAQ hardware is included with the NI DAQ software kit The LabWindows CVI Data Acquisition Library is functionally equivalent to the NI DAQ software VirtualBench features VIs that combine DAQ products software and your computer to create a stand alone instrument with the added benefit of the processing display and storage capabilities of your computer VirtualBench instruments load and save waveform data to disk in the same forms that can be used in popular spreadsheet programs and word processors Using ComponentWorks LabVIEW LabWindows CVI or VirtualBench software will greatly reduce the development time for your data acquisition and control application NI DAQ Driver Software The NI DAQ driver software is included at no charge with all National Instruments DAQ hardware NI DAQ is not packaged with SCXI or accessory products except for the SCXI 1200 NI DAQ has an extensive library of functions that you can call from your application programming environment These functions include routines for analog input A D conversion buffered data acquisition high speed A D conversion analog output D A conversion waveform generation timed D A conversion digital I O counter timer operations SCXI RTSI self calibration messaging and acquiring data to memory NI DAQ has both high level DAQ I O functions for maximum
57. e Noise Ground Potential 1 ACHO ACH4 T o 5 So ACH2 S 50 ACH6 oe So O 2 ACH1 Vin Measured 1 0 Connector Voltage ACH 4 ACHI g ACH5 o so ACH7 2 So 11 AGND VW PCI 1200 in DIFF Configuration PCI 1200 User Manual Figure 3 3 Differential Input Connections for Grounded Signal Sources With this type of connection the instrumentation amplifier rejects both the common mode noise in the signal and the ground potential difference between the signal source and the PCI 1200 ground shown as Vem in Figure 3 3 3 10 National Instruments Corporation Differential Connections for Floating Signal Sources Chapter 3 Signal Connections Figure 3 4 shows how to connect a floating signal source to a PCI 1200 board configured for DIFF input Configuration instructions are in the Analog I O Configuration section of Chapter 2 Installation and Configuration o1 acho o ACH2 ME so 5 ACH4 Floating o So Signal ACH6 Source C olf So elo a nel oo v Measured ii Voltage ACH3 4 100 KQ OF So Bias 6 VACHS E O Current Return 3 8 ACH7 go Paths 100 kQ s es 11 AGND I O Connector Vv PCI 1200 in DIFF Configuration The 100 kQ resistors shown in Figure 3 4 create a return path to ground for th
58. e bias currents of the instrumentation amplifier If there is no return path Figure 3 4 Differential Input Connections for Floating Sources the instrumentation amplifier bias currents charge stray capacitances National Instruments Corporation PCI 1200 User Manual Chapter 3 Signal Connections PCI 1200 User Manual resulting in uncontrollable drift and possible saturation in the amplifier Typically values from 10 KQ to 100 KQ are used A resistor from each input to ground as shown in Figure 3 4 provides bias current return paths for an AC coupled input signal If the input signal is DC coupled you need only the resistor that connects the negative signal input to ground This connection does not lower the input impedance of the analog input channel Single Ended Connection Considerations Single ended connections are those in which all PCI 1200 analog input signals are referenced to one common ground The input signals are tied to the positive input of the instrumentation amplifier and their common ground point is tied to the negative input of the instrumentation amplifier When the PCI 1200 is configured for single ended input NRSE or RSE eight analog input channels are available Use single ended input connections when the following conditions are met by all input signals e Input signals are high level greater than 1 V e Leads connecting the signals to the PCI 1200 are less than 10 ft e All input signa
59. ed to perform any configuration steps after the system powers up Analog 1 0 Configuration Upon power up or after a software reset the PCI 1200 is set to the following configuration e Referenced single ended input mode e 5 V analog input range bipolar e 5 V analog output range bipolar Table 2 1 lists all the available analog I O configurations for the PCI 1200 and shows the configuration in reset condition Table 2 1 Analog 1 0 Settings Configuration Analog Output CHO Polarity Bipolar 5 V reset condition Unipolar 0 to 10 V Analog Output CH1 Polarity Bipolar 5 V reset condition Unipolar 0 to 10 V Analog Input Polarity Analog Input Mode Bipolar 5 V reset condition Unipolar 0 to 10 V Referenced single ended RSE reset condition Nonreferenced single ended NRSE Differential DIFF PCI 1200 User Manual Both the analog input and analog output circuitries are software configurable Refer to your software documentation for more information on changing these settings 2 2 National Instruments Corporation Chapter 2 Installation and Configuration Analog Output Polarity The PCI 1200 has two channels of analog output voltage at the T O connector You can configure each analog output channel for either unipolar or bipolar output A unipolar configuration has a range of 0 to 10 V at the analog output A bipolar configuration has a range of 5 to 5 V
60. emperature coefficient 50 uV C Gain temperature coefficient 30 ppm C Explanation of Analog Output Specifications Relative accuracy in a D A system is the same as nonlinearity because no uncertainty is added due to code width Unlike an ADC every digital code in a D A system represents a specific analog value rather than a range of values The relative accuracy of the system is therefore limited to the worst case deviation from the ideal correspondence a straight line except noise If a D A system has been calibrated perfectly the relative accuracy specification reflects its worst case absolute error DNL ina D A system is a measure of deviation of code width from 1 LSB In this case code width is the difference between the analog values produced by consecutive digital codes A specification of 1 LSB differential nonlinearity ensures that the code width is always greater than 0 LSBs guaranteeing monotonicity and is always less than 2 LSBs Digital 1 0 Number of channels 0 00 0 24 I O three 8 bit ports uses 82C55A PPI Compatibility 0 0 eeeeeeeeees TTL Digital logic levels Level Min Max Input low voltage 0 3 V 0 8 V Input high voltage 2 2 V 5 3 V National Instruments Corporation A 7 PCI 1200 User Manual Appendix A Timing 1 0 PCI 1200 User Manual Specifications Output low voltage our 2 5 mA 0 4 V Output high voltage
61. er B2 48 CLKB2 DI DGND Clock B2 External control clock signal for counter B2 49 5 V DO DGND 5 Volts This pin is fused for up to 1 A of 4 65 to 5 25 V AI Analog Input AO Analog Output Indicates that the signal is active low DI Digital Input DO Digital Output DIO Digital Input Output N A Not Applicable PCI 1200 User Manual The connector pins are grouped into analog input signal pins analog output signal pins digital I O signal pins timing I O signal pins and power connections The following sections describe the signal connection guidelines for each of these groups 3 4 National Instruments Corporation Chapter 3 Signal Connections Analog Input Signal Connections Pins through 8 are analog input signal pins for the 12 bit ADC Pin 9 AISENSE AIGND is an analog common signal You can use this pin for a general analog power ground tie to the PCI 1200 in RSE mode or as a return path in NRSE mode Pin 11 AGND is the bias current return point for differential measurements Pins through 8 are tied to the eight single ended analog input channels of the input multiplexer through 4 7 kQ series resistors Pins 2 4 6 and 8 and also tied to an input multiplexer for DIFF mode The signal ranges for inputs ACH lt 7 0 gt at all possible gains are shown in Tables 3 2 and 3 3 Exceeding the input signal range will not damage the input circuitry as long as the maximum powered on input
62. g In the PRETRIG mode EXTTRIG serves as a pretrigger signal Data is acquired both before and after the EXTTRIG signal occurs A D conversions are software enabled which initiates the DAQ operation However the sample counter is not started until the EXTTRIG input senses a rising edge Conversions remain enabled until the sample counter counts to zero The maximum number of samples acquired after the stop trigger is limited to 65 535 The number of samples acquired before the trigger is limited only by the size of the memory buffer available for data acquisition Figure 3 11 shows a pretrigger DAQ timing sequence using EXTTRIG and EXTCONV The DAQ operation has been initiated through software Notice that the sample counter has been programmed to allow five conversions after the rising edge on the EXTTRIG signal Additional transitions on the EXTTRIG line have no effect until you initiate a new DAQ sequence National Instruments Corporation Chapter 3 Signal Connections EXTCONV CONVERT mou Vin i i EXTTRIG E VE be ty 50 ns minimum Vil UU UP ttt ttt f Figure 3 11 Pretrigger DAQ Timing For interval scanning data acquisition counter B1 determines the scan interval Instead of using counter B1 you can externally time the scan interval through OUTB1 If you externally time the sample interval we recommend that you also externally time the scan interval Figure 3 12 shows an example of
63. gh quantization uncertainty is ideally 0 5 LSB it can be different for each possible digital code and is actually the analog width of each code Thus it is more specific to use relative accuracy as a measure of linearity than it is to use what is normally called nonlinearity because relative accuracy ensures that the sum of quantization uncertainty and A D conversion error does not exceed a given amount Integral nonlinearity INL in an ADC is an often ill defined specification that is supposed to indicate a converter s overall A D transfer linearity The manufacturer of the ADC chip National Instruments uses on the PCI 1200 specifies its integral nonlinearity by stating that the analog center of any code will not deviate from a straight line by more than 1 LSB This specification is misleading because although a particularly wide code s center may be found within 1 LSB of the ideal one of its edges may be well beyond 1 5 LSB thus the ADC would have a relative accuracy of that amount National Instruments tests its boards to ensure that they meet all three linearity specifications defined in this appendix Differential nonlinearity DNL is a measure of deviation of code widths from their theoretical value of 1 LSB The width of a given code is the size of the range of analog values that can be input to produce that code ideally 1 LSB A specification of 1 LSB differential nonlinearity ensures that no code has a width of 0 LSBs that
64. hen you configure the PCI 1200 in the DIFF mode Each input signal is tied to the positive input of the instrumentation amplifier and its reference signal or return is tied to the negative input of the instrumentation amplifier When configuring the PCI 1200 for DIFF input each signal uses two of the multiplexer inputs one for the signal and one for its reference signal Therefore only four analog input channels are available when using the DIFF configuration Use the DIFF input configuration when any of the following conditions is present e Input signals are low level less than 1 V e Leads connecting the signals to the PCI 1200 are greater than 10 ft e Any of the input signals require a separate ground reference point or return signal e The signal leads travel through noisy environments Differential signal connections reduce picked up noise and increase common mode signal and noise rejection With these connections input signals can float within the common mode limits of the input instrumentation amplifier National Instruments Corporation 3 9 PCI 1200 User Manual Chapter 3 Signal Connections Differential Connections for Grounded Signal Sources Figure 3 3 shows how to connect a ground referenced signal source to a PCI 1200 board configured for DIFF input Configuration instructions are in the Analog I O Configuration section in Chapter 2 Installation and Configuration Grounded Signal Source Common Mod
65. how to make input and output signal connections to the PCI 1200 board via the board I O connector and details the I O timing specifications Chapter 4 Theory of Operation explains the operation of each functional unit of the PCI 1200 Chapter 5 Calibration discusses the calibration procedures for the PCI 1200 analog I O circuitry Appendix A Specifications lists the PCI 1200 specifications Appendix B Customer Communication contains forms you can use to request help from National Instruments or to comment on our products The Glossary contains an alphabetical list and description of terms used in this manual including abbreviations acronyms definitions 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 ix PCI 1200 User Manual About This Manual Conventions Used in This Manual lt gt ZN aN bold bold italic italic Macintosh monospace PC NI DAQ SCXI PCI 1200 User Manual The following conventions are used in this manual Angle brackets enclose the name of a key on the keyboard for example lt shift gt Angle brackets containing numbers separated by an ellipsis represent a range of values associated with a bit or signal name for example DBIO lt 3 0 gt This icon to the left of bold italicized text denotes a note which alerts you to important information This
66. i E EEPROM contents 5 1 to 5 2 electronic support services B 1 to B 2 e mail support B 2 environment specifications A 9 equipment optional 1 5 event counting with external switch gating figure 3 24 general purpose timing signal connections 3 23 EXTCONV signal definition table 3 4 interval scanning DAQ operation 3 21 maximum voltage input rating 3 23 timing connections 3 19 to 3 21 signal timing figure 3 19 EXTTRIG signal DAQ timing 3 19 to 3 20 definition table 3 3 maximum voltage input rating 3 23 EXTUPDATE signal DAQ timing 3 22 to 3 23 definition table 3 3 maximum voltage input rating 3 23 updating DAC output figure 3 23 F fax and telephone support numbers B 2 Fax on Demand support B 2 floating signal sources differential connections 3 11 to 3 12 PCI 1200 User Manual l 4 purpose and use 3 7 recommended input configurations table 3 8 single ended connections RSE configuration 3 13 freerun acquisition mode 4 8 frequency measurement connections for measurement application figure 3 25 general purpose timing signal connections 3 24 to 3 25 FTP support B 1 G GATBO signal table 3 4 GATBI signal table 3 4 GATB2 signal table 3 4 GATE signals general purpose timing signal connections 3 23 to 3 26 interval scanning DAQ operation 3 21 timing requirements figure 3 26 general purpose timing signal connections See also DAQ timing connections event coun
67. ign of damage Notify National Instruments if the board appears damaged in any way Do not install a damaged board into your computer e Never touch the exposed pins of connectors Software Programming Choices There are several options to choose from when programming your National Instruments DAQ or SCXI hardware You can use LabVIEW LabWindows CVI ComponentWorks VirtualBench NI DAQ or register level programming National Instruments Application Software PCI 1200 User Manual ComponentWorks contains tools for data acquisition and instrument control built on NI DAQ driver software ComponentWorks provides a higher level programming interface for building virtual instruments through standard OLE controls and DLLs With ComponentWorks you can use all of the configuration tools resource management utilities and interactive control utilities included with NI DAQ LabVIEW features interactive graphics a state of the art user interface and a powerful graphical programming language The LabVIEW Data Acquisition Virtual Instrument VI Library a series of VIs for using LabVIEW with National Instruments DAQ hardware is included with 1 2 National Instruments Corporation Chapter 1 Introduction LabVIEW The LabVIEW Data Acquisition VI Library is functionally equivalent to the NI DAQ software LabWindows CVI features interactive graphics a state of the art user interface and uses the ANSI standard C programming language Th
68. iming or you can use the external timing signal CLKB1 for analog input timing If you are not using counters BO and B1 for internal timing you can use these counters as general purpose counter timers Counter B2 is reserved for external use as a general purpose counter timer For a more detailed description of counter group A and counters BO and B1 refer to the Analog Input and Analog Output sections The PCI 1200 has eight channels of analog input with software programmable gain and 12 bit A D conversion The PCI 1200 also contains DAQ timing circuitry for automatic timing of multiple A D conversions and includes advanced options such as external triggering gating and clocking Figure 4 4 shows a block diagram of the analog input circuitry ACHO ACH1 ACH2 ACH3 ACH4 ACHS ACH6 ACH7 ACH1 ACH3 ACHS ACH7 AISENSE AIGND EXTTRIG EXTCONV OUTB1 VO Connector Address Data Address A D Data 37 Data AID Interface Control H Firo 12 A 2 ea Error Reporting Digital MITE RD Control PCI A Logic CONV 9 Interface Arbitration AVAIL Chip t Data 7 2 8 System lt lt _ _ _ WRT RD A 2 Gain Select 5 Mux Counter Interrupt L f e P Mux L Dither Dither Circuitry Dither Enable DAQ P Counter Timer External Trigger gt Timing Signals External Convert A
69. ing signal sources 3 11 to 3 12 grounded signal sources 3 10 purpose and use 3 9 when to use 3 9 exceeding maximum input voltage ratings caution 3 5 floating signal sources 3 7 ground referenced signal sources 3 7 to 3 8 input configurations 3 7 to 3 15 instrumentation amplifier 3 6 pins 3 5 recommended input configurations table 3 8 single ended connections 3 12 floating signal sources RSE configuration 3 13 grounded signal sources NRSE configuration 3 13 to 3 14 when to use 3 12 types of signal sources 3 7 unipolar signal range vs gain table 3 5 to 3 6 analog input specifications A 1 to A 6 amplifier characteristics A 2 to A 3 dynamic characteristics A 3 to A 4 explanation A 4 to A 5 input characteristics A 1 to A 2 stability A 3 to A 4 transfer characteristics A 2 analog output circuitry 4 11 to 4 12 DAC timing 4 12 polarity configuration 2 3 settings table 2 2 PCI 1200 User Manual l 2 signal connections 3 15 to 3 16 theory of operation 4 11 to 4 12 analog output specifications A 6 to A 7 dynamic characteristics A 7 explanation A 7 output characteristics A 6 stability A 7 transfer characteristics A 6 voltage output A 6 to A 7 bipolar signal range vs gain table 3 5 bulletin board support B 1 bus interface specifications A 9 C cabling custom 1 5 to 1 6 Calibrate_1200 function 5 3 calibration 5 1 to 5 3 EEPROM contents 5 1 to 5 2 equipment requ
70. ion is initiated by a falling edge on the EXTCONV u t 0 H LLL 5 gt L tw 250 ns minimum A D Conversion starts within 125 ns from this point Figure 3 9 EXTCONV Signal Timing The external control signal EXTTRIG can either start a DAQ sequence or terminate an ongoing DAQ sequence depending on the mode posttrigger POSTTRIG or pretrigger PRETRIG These modes are software selectable In the POSTTRIG mode EXTTRIG serves as an external trigger that initiates a DAQ sequence When you use counter AO to time sample intervals a rising edge on EXTTRIG starts counter AO and the DAQ sequence When you use EXTCONV to time sample intervals data acquisition is enabled on a rising edge of EXTTRIG followed by a rising edge on EXTCONV The first conversion occurs on the next falling edge National Instruments Corporation 3 19 PCI 1200 User Manual Chapter 3 Signal Connections of EXTCONV Further transitions on the EXTTRIG line have no effect until anew DAQ sequence is established Figure 3 10 shows a possible controlled DAQ sequence using EXTCONV and EXTTRIG The rising edge of EXTCONV that enables external conversions must occur a minimum of 50 ns after the rising edge of EXTTRIG The first conversion occurs on the next falling edge of EXTCONV EXTTRIG EXTCONV CONVERT tw 50 ns minimum ty 50 ns minimum ELCT PCI 1200 User Manual Figure 3 10 Posttrigger DAQ Timin
71. ional Instruments for technical support helps our applications engineers answer your questions more efficiently National Instruments Products Serial number Base memory address of PCI 1200 Interrupt line value NI DAQ LabVIEW LabWindows CVI ComponentWorks or Virtual Bench Other Products Computer make and model Microprocessor Clock frequency or speed Type of video board installed Operating system version Operating system mode Programming language Programming language version Other boards in system Base I O address of other boards DMA channels of other boards Interrupt level of other boards 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 PCI 1200 User Manual Edition Date July 1998 Part Number 320942C 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 Address 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
72. ious modes of data acquisition and analog output refer to your NI DAQ documentation or to Chapter 4 Theory of Operation in this manual General Purpose Timing Signal Connections The general purpose timing signals include the GATE CLK and OUT signals for the three 82C53 B counters The 82C53 counter timers can be used for general purpose applications such as pulse and square wave generation event counting and pulse width time lapse and frequency measurement For these applications the CLK and GATE signals at the I O connector control the counters The single exception is counter BO which has an internal 2 MHz clock To perform pulse and square wave generation program a counter to generate a timing signal at its OUT output pin To perform event counting program a counter to count rising or falling edges applied to any of the 82C53 CLK inputs then read the counter value to determine the number of edges that have occurred You can enable or disable the counting operation by controlling the gate input Figure 3 14 shows connections for a typical event counting operation in which a switch is used to gate the counter on and off National Instruments Corporation 3 23 PCI 1200 User Manual Chapter 3 Signal Connections 5 V 100 kQ O CLK OUT so o e GATE Switch Signal Source Counter from Group B o 13 DGND 1 O Connector Seer
73. irements 5 2 higher gains 5 2 methods 5 1 overview 5 1 using the Calibrate_1200 function 5 3 CLK signals general purpose timing signal connections 3 23 to 3 26 timing requirements figure 3 26 CLKB1 signal table 3 4 CLKB2 signal table 3 4 CNTINT signal 3 22 common mode signal rejection considerations 3 14 to 3 15 ComponentWorks application software 1 2 configuration analog input analog I O settings table 2 2 input modes 2 3 to 2 5 National Instruments Corporation input polarity 2 3 analog output polarity 2 3 controlled acquisition mode 4 8 Counter 0 on 82C53 A counter timer 3 19 Counter 1 on 82C53 A counter timer 3 19 counter timers 4 3 to 4 5 circuitry figure 4 4 custom cabling 1 5 to 1 6 customer communication xii B 1 to B 2 D DAC timing 4 12 DACOOUT signal table 3 3 DACIOUT signal table 3 3 DACWRT signal 3 22 DAQ and general purpose timing signal connections 3 18 to 3 30 DAQ timing connections 3 19 to 3 23 general purpose timing connections 3 23 to 3 26 pins 3 18 to 3 19 timing specifications 3 27 to 3 30 DAQ operations 4 7 to 4 9 controlled acquisition mode 4 8 freerun acquisition mode 4 8 interval scanning acquisition mode 4 8 to 4 9 multiple channel scanned data acquisition 4 9 single channel data acquisition 4 9 DAQ rates 4 10 to 4 11 explanation A 5 to A 6 maximum recommended rates table 4 10 settling time vs gain table 4 10 DAQ ti
74. l Instruments offers cables and accessories for you to prototype your application or to use if you frequently change board interconnections If you want to develop your own cable however the following guidelines may be useful e For the analog input signals shielded twisted pair wires for each analog input pair yield the best results assuming that you use differential inputs Tie the shield for each signal pair to the ground reference at the source e You should route the analog lines separately from the digital lines e When using a cable shield use separate shields for the analog and digital halves of the cable Failure to do so results in noise coupling into the analog signals from transient digital signals National Instruments Corporation 1 5 PCI 1200 User Manual Chapter 1 Introduction The mating connector for the PCI 1200 is a 50 position polarized ribbon socket connector with strain relief National Instruments uses a polarized keyed connector to prevent inadvertent upside down connection to the PCI 1200 Recommended manufacturer part numbers for this mating connector are as follows e Electronic Products Division 3M part number 3425 7650 e T amp B Ansley Corporation part number 609 5041CE PCI 1200 User Manual 1 6 National Instruments Corporation Installation and Configuration This chapter describes how to install and configure your PCI 1200 Software Installation If you are using NI DAQ or Nati
75. l 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 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 cop
76. ls share a common reference signal at the source If any of the preceding criteria is not met use the DIFF input configuration You can software configure the PCI 1200 for two different types of single ended connections RSE configuration and NRSE configuration Use the RSE configuration for floating signal sources in this case the PCI 1200 provides the reference ground point for the external signal Use the NRSE configuration for ground referenced signal sources in this case the external signal supplies its own reference ground point and the PCI 1200 should not supply one 3 12 National Instruments Corporation Chapter 3 Signal Connections Single Ended Connections for Floating Signal Sources RSE Configuration Figure 3 5 shows how to connect a floating signal source to a PCI 1200 board configured for RSE mode Configure the PCI 1200 analog input circuitry for RSE input to make these types of connections Configuration instructions are in the Analog I O Configuration section of Chapter 2 Installation and Configuration Sc Floating Signal Vs Source 1 ACHO So o gae p 3 ACHA so 8 ACH7 9 AISENSE AIGND v Measured m 1 O Connector Voltage 11 AGND O I Z PCI 1200 in RSE Configuration Figure 3 5 Single Ended Input Connections for Floating Signal Sources Single Ended Connections for Grounded Signal Sources NRSE Co
77. ltiplexers analog input 4 6 mux counters 4 6 NI DAQ driver software 1 3 to 1 4 noise system A 5 NRSE input configuration 2 4 to 2 5 definition table 2 4 recommended input configurations table 3 8 single ended connections for ground referenced signal sources 3 13 to 3 14 0 OBF signal table 3 27 operation of PCI 1200 See theory of operation OUT signals general purpose timing signal connections 3 23 to 3 26 timing requirements figure 3 26 OUTBO signal table 3 4 OUTBI signal definition table 3 4 interval scanning signal timing 3 23 maximum voltage input rating 3 23 OUTB2 signal table 3 4 P PA lt 7 0 gt signal table 3 3 PB lt 7 0 gt signal table 3 3 PC lt 7 0 gt signal table 3 3 PCI interface circuitry block diagram 4 2 theory of operation 4 2 to 4 3 PCI 1200 User Manual Index PCI 1200 block diagram 4 1 configuration See configuration custom cabling 1 5 to 1 6 features 1 1 installation 2 1 optional equipment 1 5 requirements for getting started 1 1 to 1 2 software programming choices National Instruments application software 1 2 to 1 3 NI DAQ driver software 1 3 to 1 4 register level programming 1 4 theory of operation See theory of operation unpacking 1 2 physical specifications A 9 pin assignments for I O connector figure 3 2 polarity analog input 2 3 analog output 2 3 settings table 2 2 Port C pin connections 3 18 signal assig
78. ment National Instruments Corporation A 9 Power CONSUMPTION eeseeeeeeeeneeeenees 425 mA at 5 VDC 45 Power available at I O connector 4 65 to 5 25 V fused at 1 A DIMENSIONS s2 cessed ela naron onn 17 45 by 10 56 cm 6 87 by 4 16 in VO CONNEC CON sivveeers ce teeth tee wortsetriene ct 50 pin male Operating temperature 0 to 50 C Storage temperature 0 eee 55 to 150 C Relative humidity 0 00 0 eee 5 to 90 noncondensing PCI 1200 User Manual 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 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 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
79. ming connections 3 19 to 3 23 See also general purpose timing signal connections EXTCONV signal 3 19 to 3 21 EXTCONV signal timing figure 3 19 National Instruments Corporation l 3 Index EXTTRIG signal 3 19 to 3 20 EXTUPDATE signal 3 22 to 3 23 interval scanning 3 21 pins 3 18 to 3 19 posttrigger and pretrigger modes 3 19 to 3 20 posttrigger timing figure 3 20 pretrigger timing figure 3 21 data acquisition timing connections See DAQ timing connections DATA signal table 3 27 DGND signal table 3 3 DIFF input configuration 2 5 definition table 2 4 recommended input configurations table 3 8 differential connections DIFF configuration 3 9 floating signal sources 3 11 to 3 12 ground referenced signal sources 3 10 purpose and use 3 9 when to use 3 9 differential nonlinearity DNL analog input A 4 analog output A 7 digital I O circuitry illustration 4 12 theory of operation 4 12 to 4 13 digital I O signal connections illustration 3 17 logical inputs and outputs 3 17 to 3 18 pins 3 16 Port C pin connections 3 18 digital I O specifications A 7 to A 8 digital trigger A 9 dither circuitry explanation A 5 theory of operation 4 6 to 4 7 DNL differential nonlinearity analog input A 4 PCI 1200 User Manual Index analog output A 7 documentation conventions used in manual x National Instruments documentation set xi organization of manual ix related documentation xi
80. nfiguration If you measure a grounded signal source with a single ended configuration configure the PCI 1200 in the NRSE input configuration The signal is connected to the positive input of the PCI 1200 instrumentation amplifier and the signal local ground reference is connected to the negative input of the PCI 1200 instrumentation amplifier Therefore connect the ground point of the signal to the AISENSE pin Any potential difference between the PCI 1200 ground and the signal ground appears as a common mode signal at both the positive and negative inputs of the instrumentation amplifier and is therefore rejected by the amplifier On the other hand if the input circuitry of the PCI 1200 is referenced to ground such as in the National Instruments Corporation 3 13 PCI 1200 User Manual Chapter 3 Signal Connections RSE configuration this difference in ground potentials appears as an error in the measured voltage Figure 3 6 shows how to connect a grounded signal source to a PCI 1200 board configured in the NRSE configuration Configuration instructions are included in the Analog I O Configuration section in Chapter 2 Installation and Configuration PCI 1200 User Manual 1 ACHO ome 2 ACH1 e So Ground Referenced 5 3 ACHE ae Signal Vs Source ACH7 f 5 8 C lt o Common 9 _ a ees AISENSE AIGND yy Te Noise 11 AGND oltage and so on E 1 0 Connector PCI 1200 in NRSE Input Configuration
81. nments table 3 18 POSTTRIG mode 3 19 posttrigger DAQ timing figure 3 20 power connections 3 18 power requirement specifications A 9 PRETRIG mode 3 20 pretrigger DAQ timing figure 3 21 programmable gain amplifier 4 6 pulse generation 3 23 pulse width measurement 3 24 R RD signal table 3 27 referenced single ended mode See RSE input register level programming 1 4 PCI 1200 User Manual l 6 relative accuracy analog input A 4 analog output A 7 RSE input configuration 2 4 definition table 2 4 recommended input configurations table 3 8 single ended connections for floating signal sources 3 13 S sample interval timing 3 21 signal connections analog input signal connections 3 5 to 3 15 bipolar signal range vs gain table 3 5 common mode signal rejection 3 14 to 3 15 differential connections 3 9 to 3 12 exceeding maximum input voltage ratings caution 3 5 input configurations 3 7 to 3 15 instrumentation amplifier 3 6 recommended input configurations table 3 8 single ended connections 3 12 to 3 14 types of signal sources 3 7 unipolar signal range vs gain table 3 5 to 3 6 analog output signal connections 3 15 to 3 16 DAQ and general purpose timing signal connections DAQ timing connections 3 19 to 3 23 general purpose timing connections 3 23 to 3 26 National Instruments Corporation pins 3 18 to 3 19 timing specifications 3 27 to 3 30 digital I O signal conne
82. nts sample intervals while counter Al counts samples In a controlled acquisition mode DAQ operation the board performs a specified number of conversions and then the hardware shuts off the conversions Counter AO generates the conversion pulses and counter A1 gates off counter AO after the programmed count has expired The number of conversions in a single controlled acquisition mode DAQ operation is limited to a 16 bit count 65 535 conversions Freerun Acquisition Mode The PCI 1200 uses one counter counter AO to execute DAQ operations in freerun acquisition mode Counter AO continuously generates the conversion pulses as long as GATEAO is held at a high logic level The software keeps track of the number of conversions that have occurred and turns off counter AO either after the required number of conversions has been obtained or after some other user defined criteria have been met The number of conversions in a single freerun acquisition mode DAQ operation is unlimited Interval Scanning Acquisition Mode The PCI 1200 uses two counters for interval scanning data acquisition Counter B1 is used to time the scan interval Counter AO times the sample interval In interval scanning analog input operations scan sequences are executed at regular specified intervals The amount of time that elapses between consecutive scans within the sequence is the sample interval The amount of time that elapses between consecutive scan sequences is the
83. om the ideal A D or D A transfer characteristic of the analog I O circuitry interrupt request signal input output G 4 National Instruments Corporation Glossary LED light emitting diode LSB least significant bit m meters max maximum MB megabytes of memory min minutes min minimum MIO multifunction I O MSB most significant bit mux multiplexer a switching device with multiple inputs that connects one of its inputs to its output 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 respect to the measurement system ground 0 OBF output buffer full signal OUTBO OUTB1 counter BO B1 output signals OVERFLOW overflow error OVERRUN overrun error National Instruments Corporation G 5 PCI 1200 User Manual Glossary P PA PB PC lt 0 7 gt PCI port postriggering POSTTRIG PPI ppm PRETRIG pretriggering RD Rext RSE PCI 1200 User Manual port A B or C 0 through 7 signals 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 a digital port consisting of four or eight lines of digital input and or output the technique used on a DA
84. omputer National Instruments is nor liable for any damage due to incorrect power connections DAQ and General Purpose Timing Signal Connections Pins 38 through 48 of the I O connector are connections for timing I O signals The PCI 1200 timing I O uses two 82C53 counter timer integrated circuits One circuit designated 82C53 A is used exclusively for DAQ PCI 1200 User Manual 3 18 National Instruments Corporation VI EXTCONV VI Chapter 3 Signal Connections timing and the other 82C53 B is available for general use Use pins 38 through 40 and pin 43 to carry external signals for DAQ timing These signals are explained in the next section DAQ Timing Connections Pins 41 through 48 carry general purpose timing signals from 82C53 B These signals are explained in the General Purpose Timing Signal Connections section later in this chapter DAQ Timing Connections Each 82C53 counter timer circuit contains three counters Counter 0 on the 82C53 A counter timer referred to as AO is a sample interval counter in timed A D conversions Counter on the 82C53 A counter timer referred to as Al is a sample counter in controlled A D conversions Therefore counter Al stops data acquisition after a predefined number of samples These counters are not available for general use Instead of counter AO you can use EXTCONV to externally time conversions Figure 3 9 shows the timing requirements for the EXTCONV input An A D convers
85. onal Instruments application software refer to the installation instructions in your software documentation to install and configure your software If you are a register level programmer refer to the PCI 1200 Register Level Programmer Manual Hardware Installation The PCI 1200 can be installed in any unused PCI expansion slot in your computer The following are general installation instructions Consult the user manual or technical reference manual for your computer for specific instructions and warnings Turn off your computer 2 Remove the top cover or access port to the I O channel 3 Remove the expansion slot cover on the back panel of the computer 4 Insert the PCI 1200 in an unused 5 V PCI slot The fit may be tight but do not force the board into place 5 Screw the PCI 1200 mounting bracket to the back panel rail of the computer or use the slot side tabs if available to secure the PCI 1200 in place 6 Replace the top cover on the computer The PCI 1200 board is installed National Instruments Corporation 2 1 PCI 1200 User Manual Chapter 2 Installation and Configuration Board Configuration The PCI 1200 is completely software configurable The PCI 1200 is fully compliant with the PCI Local Bus Specification Revision 2 0 Therefore all board resources are automatically allocated by the system For the PCI 1200 this allocation includes the base memory address and interrupt level You do not ne
86. operation 4 3 to 4 5 timing I O specifications A 8 to A 9 timing signal connections DAQ timing connections 3 19 to 3 23 EXTCONV signal 3 19 to 3 21 EXTCONV signal timing figure 3 19 EXTTRIG signal 3 19 to 3 20 EXTUPDATE signal 3 22 to 3 23 interval scanning 3 21 pins 3 18 to 3 19 posttrigger and pretrigger modes 3 19 to 3 20 posttrigger timing figure 3 20 pretrigger timing figure 3 21 PCI 1200 User Manual Index general purpose timing signal connections event counting 3 23 with external switch gating figure 3 24 frequency measurement 3 24 to 3 25 connections for measurement application figure 3 25 GATE CLK and OUT signals 3 23 to 3 26 pins 3 18 to 3 19 pulse width measurement 3 24 specifications and ratings 3 25 to 3 26 square wave generation 3 23 time lapse measurement 3 24 timing requirements for GATE CLK and OUT signals figure 3 26 timing specifications 3 27 to 3 30 mode input timing 3 28 mode output timing 3 29 mode 2 bidirectional timing 3 30 trigger digital A 9 U unipolar signal range vs gain table 3 5 to 3 6 unpacking the PCI 1200 1 2 V VirtualBench application software 1 3 W waveform generation timing sequence 3 22 to 3 23 WRT signal table 3 27 PCI 1200 User Manual l 8 National Instruments Corporation
87. ou select the delayed update mode a value is written to the DAC however the corresponding DAC voltage is not updated until a low level on the EXTUPDATE signal is sensed Furthermore if you enable interrupt generation an interrupt is generated whenever a rising edge is detected on the EXTUPDATE bit Therefore you can perform externally timed interrupt driven waveform generation on the PCI 1200 The EXTUPDATE line is susceptible to noise caused by switching lines and could generate false interrupts We recommend that the width of the EXTUPDATE pulse be as short as possible but greater than 50 ns Figure 3 13 illustrates a waveform generation timing sequence using the EXTUPDATE signal and the delayed update mode The DACs are updated by a high level on the DAC OUTPUT UPDATE signal which in this case is triggered by a low level on the EXTUPDATE line CNTINT is the signal that interrupts the computer This interrupt is generated on the rising edge of EXTUPDATE DACWRT is the signal that writes a new value to the DAC 3 22 National Instruments Corporation Chapter 3 Signal Connections EXTUPDATE DAC OUTPUT UPDATE CNTINT DACWRT ty Minimum 50 ns Figure 3 13 EXTUPDATE Signal Timing for Updating DAC Output The absolute max voltage input rating for the EXTCONV EXTTRIG OUTBI and EXTUPDATE signals is 0 5 to 5 5 V with respect to DGND For more information concerning the var
88. ress 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 PCI 1200 User Manual Telephone 03 9879 5166 0662 45 79 90 0 02 757 00 20 011 288 3336 905 785 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 01 48 14 24 14 089 714 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
89. rporation About This Manual National Instruments Documentation The PCI 1200 User Manual is one piece of the documentation set for your DAQ system You could have any of several types of manuals depending on the hardware and software in your system Use the manuals you have as follows National Instruments Corporation Getting Started with SCXI If you are using SCXI this is the first manual you should read It gives an overview of the SCXI system and contains the most commonly needed information for the modules chassis and software Your SCX hardware user manuals If you are using SCXI read these manuals next for detailed information about signal connections and module configuration They also explain in greater detail how the module works and contain application hints Your DAQ hardware user manuals These manuals have detailed information about the DAQ hardware that plugs into or is connected to your computer Use these manuals for hardware installation and configuration instructions specification information about your DAQ hardware and application hints Software documentation Examples of software documentation you may have are the LabVIEW or LabWindows CVI documentation sets and the NI DAQ documentation After you set up your hardware system use either the application software LabVIEW or LabWindows CVI or the NI DAQ documentation to help you write your application If you have a large and complicated system
90. rumentation amplifier Vint Vir Vin Vint Vind GAIN Instrumentation Amplifier Vm Measured Voltage m Figure 3 2 PCI 1200 Instrumentation Amplifier The PCI 1200 instrumentation amplifier applies gain common mode voltage rejection and high input impedance to the analog input signals connected to the PCI 1200 board Signals are routed to the positive and negative inputs of the instrumentation amplifier through input multiplexers on the PCI 1200 The instrumentation amplifier converts two input signals to a signal that is the difference between the two input signals multiplied by the gain setting of the amplifier The amplifier output voltage is referenced to the PCI 1200 ground The PCI 1200 ADC measures this output voltage when it performs A D conversions All signals must be referenced to ground either at the source device or at the PCI 1200 If you have a floating source you must use a ground referenced input connection at the PCI 1200 If you have a 3 6 National Instruments Corporation Chapter 3 Signal Connections grounded source you must use a nonreferenced input connection at the PCI 1200 Types of Signal Sources When configuring the input mode of the PCI 1200 and making signal connections first determine whether the signal source is floating or ground referenced These two types of signals are described as follows Floating Signal Sources A floating signal source i
91. ry calibration constants are automatically loaded into the calibration DAC the first time a function pertaining to the PCI 1200 is called and again each time you change your configuration which includes gain You can instead choose to load the calibration DACs with calibration constants from the user areas in the EEPROM or you can recalibrate the PCI 1200 and load these constants directly into the calibration DACs Calibration software is included with the PCI 1200 as part of your NI DAQ software Calibration at Higher Gains The PCI 1200 has a maximum gain error of 0 8 This means that if the board is calibrated at a gain of and if the gain is switched to 100 a maximum error of 32 LSB may result in the reading Therefore when you are recalibrating the PCI 1200 you should perform gain calibration at all other gains 2 5 10 20 50 and 100 and store the corresponding values in the user gain calibration data area of the EEPROM thus ensuring a maximum error of 0 02 at all gains The PCI 1200 is factory calibrated at all gains and NI DAQ automatically loads the correct values into the calibration DACs whenever you switch gains Calibration Equipment Requirements PCI 1200 User Manual The equipment you use to calibrate the PCI 1200 should have a 0 001 rated accuracy which is 10 times as accurate as the PCI 1200 However calibration equipment with only four times the accuracy as the PCI 1200 and a 0 003 rated accuracy is ac
92. s not connected in any way to the building ground system but has an isolated ground reference point Some examples of floating signal sources are outputs of transformers thermocouples battery powered devices optical isolator outputs and isolation amplifiers Tie the ground reference of a floating signal to the PCI 1200 analog input ground to establish a local or onboard reference for the signal Otherwise the measured input signal varies or appears to float An instrument or device that supplies an isolated output falls into the floating signal source category Ground Referenced Signal Sources A ground referenced signal source is connected in some way to the building system ground and is therefore already connected to a common ground point with respect to the PCI 1200 assuming that the computer is plugged into the same power system Nonisolated outputs of instruments and devices that plug into the building power system fall into this category The difference in ground potential between two instruments connected to the same building power system is typically between and 100 mV but can be much higher if power distribution circuits are not properly connected The connection instructions that follow for grounded signal sources eliminate this ground potential difference from the measured signal Note If you power both the PCI 1200 and your computer with a floating power source such as a battery your system may be floating with respect to e
93. sequence The programmable gain amplifier applies gain to the input signal allowing an input analog signal to be amplified before being sampled and converted thus increasing measurement resolution and accuracy The instrumentation amplifier gain is software selectable The PCI 1200 board provides gains of 1 2 5 10 20 50 and 100 The dither circuitry when enabled adds approximately 0 5 LSBrms of white Gaussian noise to the signal to be converted to the ADC This addition is useful for applications involving averaging to increase the resolution of the PCI 1200 to more than 12 bits as in calibration In such applications which are often lower frequency in nature noise modulation is decreased and differential linearity is improved by the addition of the dither For high speed 12 bit applications not involving averaging you should disable dither because it only adds noise When taking DC measurements such as when calibrating the board enable dither and average about 1 000 points to take a single reading This process removes the effects of 12 bit quantization and reduces measurement noise resulting in improved resolution Dither or additive white noise has the effect of forcing quantization noise to become a zero mean random variable rather than a deterministic function of input For more information on the effects of dither see Dither in Digital Audio by John Vanderkooy and 4 6 National Instruments Corporation Chapter 4
94. tal I O and three 16 bit counter timers for timing I O The PCI 1200 is a member of the National Instruments PCI Series of expansion boards for PCI bus computers These boards are designed for high performance data acquisition and control for applications in laboratory testing production testing and industrial process monitoring and control Detailed PCI 1200 specifications are in Appendix A Specifications What You Need to Get Started To set up and use your PCI 1200 you will need the following Q PCI 1200 board Q PCI 1200 User Manual Q One of the following software packages and documentation ComponentWorks LabVIEW for Macintosh LabVIEW for Windows LabWindows CVI for Windows Measure National Instruments Corporation 1 1 PCI 1200 User Manual Chapter 1 Introduction Unpacking NI DAQ for Macintosh NI DAQ for PC compatibles VirtualBench Q Your computer Your PCI 1200 is shipped in an antistatic package to prevent electrostatic damage to the board Electrostatic discharge can damage several components on the board To avoid such damage in handling the board take the following precautions e Ground yourself via a grounding strap or by holding a grounded object e Touch the antistatic package to a metal part of your computer chassis before removing the board from the package e Remove the board from the package and inspect the board for loose components or any other s
95. te 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 ee eceseesceseceseeseeeseceeesecseeeseeseeesesseeeaeesaeeaseneeeaes ix Conventions Used in This Manual seesseeeseeesseesresresrsresrrresreresrrstesrssesresrsresrsresresreses x National Instruments Documentation cecccesceeeeceseeesceceseeeseeeeaeceeeeseeceaeecseeeeseeenees xi Related Documentation cenna a o ieaiai xii Customer Communication enese aniria e a E E EE R aa xii Chapter 1 Introduction About the PECI T200 toni aa e E A R T A Ea 1 1 What You Need to Get St rtedsi oinnia eiaa ai 1 1 Umpacking sio eirian e eaaa seschpstosbecidsadepvecsbeesdsecssbastdtesscalstcansievedis 1 2 Software Programming Choices ssseeesseeseeessrerestsresreresresesrestertesentesrerestsstnsrnresrereste 1 2 National Instruments Application Software ssseseeeseeesseereererrsrsrrsssresresreees 1 2 NI DAQ Diver Software e retea Sacha reee EE EE Ei heeded 1 3 Register Level Programming cesccesseescecesecesceeeeeececeeeceseeeeeeeeaeeeeeeeaeesees 1 4 Optional Equipment ios csccccucsetdecilens Ao vse rE E E EEE ETE A E EEEE EEE 1 5 C stom Cabling stieni a R E seseats 1 5 Chapter 2 Installation and Configuration Software Installation sos ssvrsces shes veovetiveos svete Ee EERE RE ER E 2 1 Hardware Installation
96. 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 disk 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 PCI 1200 Hardware and Software Configuration Form Record the settings and revisions of your hardware and software on the line to the right of each item Complete a new copy of this form each time you revise your software or hardware configuration and use this form as a reference for your current configuration Completing this form accurately before contacting Nat
97. ting 3 23 with external switch gating figure 3 24 frequency measurement 3 24 to 3 25 GATE CLK and OUT signals 3 23 to 3 26 pins 3 18 to 3 19 pulse and square wave generation 3 23 pulse width measurement 3 24 specifications and ratings 3 25 to 3 26 time lapse measurement 3 24 timing requirements for GATE CLK and OUT signals figure 3 26 ground referenced signal sources differential connections 3 10 purpose and use 3 7 National Instruments Corporation recommended input configurations table 3 8 single ended connections NRSE configuration 3 13 to 3 14 IBF signal table 3 27 INL integral nonlinearity A 4 input configurations See analog input configuration installation hardware installation 2 1 software installation 2 1 unpacking the PCI 1200 1 2 instrumentation amplifier illustration 3 6 purpose and use 3 6 theory of operation 4 6 integral nonlinearity INL A 4 interval scanning DAQ operation description 3 21 signal timing figure 3 22 theory of operation 4 8 to 4 9 INTR signal table 3 27 T O connector exceeding maximum ratings caution 3 1 pin assignments figure 3 2 L LabVIEW application software 1 1 to 1 2 LabWindows CVI application software 1 3 manual See documentation mode input timing 3 28 mode 1 output timing 3 29 mode 2 bidirectional timing 3 30 National Instruments Corporation l 5 Index multiple channel scanned data acquisition 4 9 mu
98. unter however you must externally invert the signal 5 V 100 kQ 2 CLK OUT O hd GATE Signal Gate Source Source o Counter 13 DGND 1 O Connector ne sy PCI 1200 Figure 3 15 Frequency Measurement Application The GATE CLK and OUT signals for counters B1 and B2 are available at the I O connector The GATE and CLK pins are internally pulled up to 5 V through a 100 KQ resistor Refer to Appendix A Specifications for signal voltage and current specifications The following specifications and ratings apply to the 82C53 I O signals e Absolute max 0 5 to 5 5 V voltage input rating with respect to DGND e 82C53 digital input specifications referenced to DGND Vj input logic high voltage 2 2 V min 5 3 V max Vj input logic low voltage 0 3 V min 0 8 V max Input load current 10 uA min 10 uA max National Instruments Corporation 3 25 PCI 1200 User Manual Chapter 3 Signal Connections e 82C53 digital output specifications referenced to DGND Von output logic high voltage 3 7 V min V output logic low voltage e 0 45 V max In output source current at Voh 0 92 mA max 2 1 mA max output sink current at Voi Figure 3 16 shows the timing requirements for the GATE and CLK input signals and the timing specifications for the 82C53 OUT output signals lt
99. unter AO of the timing circuitry To specify a single channel analog input operation select an analog input channel and a gain setting for that channel Multichannel Scanned Data Acquisition The PCI 1200 executes a multichannel DAQ operation by repeatedly scanning a sequence of analog input channels the same gain is applied to each channel in the sequence The channels are scanned in decreasing consecutive order the highest numbered channel is the start channel and channel 0 is the last channel in the sequence During each scan sequence the PCI 1200 scans the start channel the highest numbered channel first then the next highest numbered channel and so on until it scans channel 0 The PCI 1200 repeats these scan sequences until the DAQ operation is terminated For example if channel 3 is specified as the start channel then the scan sequence is as follows ch3 ch2 chl chO ch3 ch2 ch1 chO ch3 ch2 To specify the scan sequence for a multichannel scanned analog input operation select the start channel for the scan sequence National Instruments Corporation 4 9 PCI 1200 User Manual Chapter 4 Theory of Operation DAQ Rates PCI 1200 User Manual Maximum DAQ rates number of samples per second are determined by the conversion period of the ADC plus the sample and hold acquisition time During multichannel scanning the DAQ rates are further limited by the settling time of the input multiplexers and programm
100. voltage rating of 35 V or powered off voltage rating of 25 V is not exceeded The PC I 1200 is guaranteed to withstand inputs up to the maximum input voltage rating J Caution Exceeding the input signal range distorts input signals Exceeding the maximum input voltage rating may damage the PCI 1200 board and the computer National Instruments is not liable for any damages resulting from such signal connections Table 3 2 Bipolar Analog Input Signal Range Versus Gain Gain Setting Input Signal Range 1 5 0 to 4 99756 V 2 2 5 to 2 49878 V 5 1 0 to 0 99951 V 10 500 to 499 756 mV 20 250 to 249 877 mV 50 100 to 99 951 mV 100 50 to 49 975 mV Table 3 3 Unipolar Analog Input Signal Range Versus Gain Gain Setting Input Signal Range 1 0 to 9 99756 V 2 0 to 4 99878 V National Instruments Corporation 3 5 PCI 1200 User Manual Chapter 3 Signal Connections PCI 1200 User Manual Table 3 3 Unipolar Analog Input Signal Range Versus Gain 5 0 to 1 99951 V 10 0 to 999 756 mV 20 0 to 499 877 mV 50 0 to 199 951 mV 20 0 to 99 975 mV How you connect analog input signals to the PCI 1200 depends on how you configure the PCI 1200 analog input circuitry and the type of input signal source With different PCI 1200 configurations you can use the PCI 1200 instrumentation amplifier in different ways Figure 3 2 shows a diagram of the PCI 1200 inst
101. ws CVI use the NI DAQ Calibrate_1200 function e Use your own register level writes to the calibration DACs and the EEPROM Use this method only if NI DAQ does not support your operating system To calibrate using register level writes you need to use the PCI 1200 Register Level Programmer Manual The PCI 1200 is software calibrated The calibration process involves reading offset and gain errors from the analog input and analog output data areas and writing values to the appropriate calibration DACs to null the errors There are four calibration DACs associated with the analog input circuitry and four calibration DACs associated with the analog output circuitry two for each output channel After the calibration process is complete each calibration DAC is at a known value Because these values are lost when the board is powered down they are also stored in the onboard EEPROM for future reference The factory information occupies one half of the EEPROM and is write protected The lower half of the EEPROM contains user areas for calibration data There are four different user areas When the PCI 1200 is powered on or the conditions under which it is operating change you must load the calibration DACs with the appropriate calibration constants National Instruments Corporation 5 1 PCI 1200 User Manual Chapter 5 Calibration If you use the PCI 1200 with NI DAQ LabVIEW LabWindows CVI or other application software the facto
102. xternal devices such as the LED shown in Figure 3 8 Port C Pin Connections The signals assigned to port C depend on the mode in which the 82C55A is programmed In mode 0 port C is considered to be two 4 bit I O ports In modes 1 and 2 port C is used for status and handshaking signals with two or three I O bits mixed in Table 3 5 summarizes the signal assignments of port C for each programmable mode Refer to the PCI 1200 Register Level Programmer Manual for register level programming information Table 3 5 Port C Signal Assignments Programmable Group A Group B Mode PC7 PC6 PC5 PC4 PC3 PC2 PC1 PCO Mode 0 T O T O T O T O T O T O T O T O Mode 1 Input T O T O IBF STB INTR STBg IBFBpg INTRg Mode 1 Output OBF ACK T O T O INTR ACKg OBFp INTRg Mode 2 OBF ACK IBF STB INTR T O T O T O Indicates that the signal is active low Power Connections Pin 49 of the I O connector supplies 5 V from the computer s power supply via a self resetting fuse The fuse will reset automatically within a few seconds after the overcurrent condition is removed Pin 49 is referenced to DGND and you can use the 5 V to power external digital circuitry e Power rating 1 A at 4 65 to 5 25 V AN Warning Do not directly connect this 5 V power pin to analog or digital ground or to any other voltage source on the PCI 1200 or any other device Doing so can damage the PCI 1200 or your c
103. yright 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 ComponentWorks CVI LabVIEW Measure MITE NI DAQ SCXI and VirtualBench are trademark of National Instruments Corporation 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 not 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 substitu

National Instruments PCI-1200 User's Manual

Contents

Download Pdf Manuals

Related Search

Related Contents