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Lab-PC-1200/AI User Manual

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1. 4 3 Analog Input 4 5 Analog Input Circuitry 4 6 Data Acquisition Operations 4 8 Controlled Acquisition Mode 4 8 Freerun Acquisition Mode 4 9 Interval Scanning Acquisition Mode 4 9 Single Channel Data Acquisition 4 9 Multichannel Scanned Data Acquisition 4 10 Data Acquisition Rates 4 10 Analog Output 4 12 Analog Output Circuitry 4 12 DAC Timing 4 13 Digital I O 4 13 Chapter 5 C
2. 3 11 Table 3 5 Port C Signal Assignments 3 22 Table 3 6 Port C Signal Descriptions 3 22 Table 4 1 Analog Input Recommended Settling Time Versus Gain 4 11 Table 4 2 1200 Series Maximum Recommended Data Acquisition Rates 4 11 National Instruments Corporation xi Lab PC 1200 AI User Manual About This Manual This manual describes the electrical and mechanical aspects of the 1200 Series boards and contains information concerning their operation and programming The Lab PC 1200 and Lab PC 1200AI boards are low cost analog digital and timing boards designed for use in PC AT series computers Additionally the Lab PC 1200 has analog output capabilities 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 Lab PC 1200 AI User Manual is organized as follows Chapter 1 Introduction describes the 1200 Series boards lists what you need to get started software programming choices and optional equipment and explains how to build custom cables and unpack your board Chapter 2 Installation and Configuration descri
3. Interrupts programmed I O Timing I O Number of channels 3 counter timers Protection 0 5 V to 5 5 V powered on 0 5 V powered off Resolution Counter timers 16 bits Compatibility TTL Base clock available 2 MHz Base clock accuracy 50 ppm max Max source frequency 8 MHz Min source pulse duration 125 ns Min gate pulse duration 100 s Protection 0 5 to 5 5 V powered on 0 5 V powered off Data transfer Interrupts programmed I O Digital Trigger Compatibility TTL Response Rising edge Pulse width 50 ns min Digital logic levels Level Min Max Input low voltage 0 3 V 0 8 V Input high voltage 2 2 V 5 3 V Output low voltage IOUT 2 1 mA 0 45 V Output high voltage IOUT 0 92 mA 3 7 V Appendix A Speci cations National Instruments Corporation A 9 Lab PC 1200 AI User Manual Bus Interface Type Slave Power Requirement Power consumpti
4. Available Transfer Characteristics Relative accuracy 0 5 LSB typ dithered 1 5 LSB max undithered DNL 1 LSB max No missing codes 12 bits guaranteed Offset error Pregain error after calibration 10 V max Pregain error before calibration 20 mV max Postgain error after calibration 1 mV max Postgain error before calibration 200 mV max Gain error relative to calibration reference After calibration 0 02 of reading max Before calibration 2 of reading max Gain 1 with gain error adjusted to 0 at gain 1 0 8 of reading max Amplifier Characteristics Input impedance Normal powered on 100 G in parallel with 50 pF Powered off 4 7 k min Overload 4 7 k min Input bias current 100 pA Input offset current 100 pA CMRR 70 dB DC to 60 Hz Appendix A Speci cations National Instruments Corporation A 3 Lab PC 1200 AI User Manual Dynamic Characteristics Bandwidth Stability Recom
5. hardware 2 1 to 2 2 software 2 1 unpacking the Lab PC 1200 AI 1 6 instrumentation amplifier illustration 3 8 purpose and use 3 8 to 3 9 integral nonlinearity A 4 interrupt channel selection 2 4 to 2 7 PC AT interrupt assignment map table 2 6 to 2 7 PC AT I O address map table 2 4 to 2 6 interval scanning data acquisition description 3 29 to 3 30 theory of operation 4 9 INTR signal description table 3 23 mode 1 input timing figure 3 24 mode 1 output timing figure 3 25 mode 2 bidirectional timing figure 3 26 I O connector exceeding maximum ratings warning 3 1 pin assignments Lab PC 1200 figure 3 2 Lab PC 1200AI figure 3 3 L Lab PC 1200 AI block diagram Lab PC 1200 4 1 Lab PC 1200AI 4 2 custom cabling 1 5 to 1 6 optional equipment 1 5 overview 1 1 requirements 1 1 to 1 2 software programming choices LabVIEW and LabWindows CVI software 1 2 NI DAQ driver software 1 3 to 1 4 register level programming 1 4 unpacking 1 6 LabVIEW and LabWindows CVI software 1 2 M manual See documentation mode 1 input timing 3 24 mode 1 output timing 3 25 mode 2 bidirectional timing 3 26 Index Lab PC 1200 AI User Manual I 6 National Instruments Corporation multichannel scanned data acquisition 4 10 multiplexers analog input 4 6 N NI DAQ driver software 1 3 to 1 4 NRSE input configuration 2 10 definition table 2 9 single ended connections
6. 3 19 Figure 3 9 Digital I O Connections 3 21 Figure 3 10 Mode 1 Timing Specifications for Input Transfers 3 24 Figure 3 11 Mode 1 Timing Specifications for Output Transfers 3 25 Figure 3 12 Mode 2 Timing Specification for Bidirectional Transfers 3 26 Figure 3 13 EXTCONV Signal Timing 3 27 Figure 3 14 Posttrigger Data Acquisition Timing 3 28 Figure 3 15 Pretrigger Data Acquisition Timing 3 29 Figure 3 16 Interval Scanning Signal Timing 3 30 Figure 3 17 EXTUPDATE Signal Timing for Updating DAC Output 3 31 Figure 3 18 Event Counting Application with External Switch Gating 3 32 Figure 3 19 Frequency Measurement Application 3 33 Figure 3 20 General Purpose Timing Signals 3 35 Figure 4 1 Lab PC 1200 Block Diagram 4 1 Figure 4 2 Lab PC 1200AI Block Diagram 4 2 Figure 4 3 PC Interface C
7. Chapter 3 Signal Connections Lab PC 1200 AI User Manual 3 14 National Instruments Corporation Figure 3 5 Differential Input Connections for Floating Sources The 100 k resistors shown in Figure 3 5 create a return path to ground for the bias currents of the instrumentation amplifier If there is no return path the instrumentation amplifier bias currents charge stray capacitances resulting in uncontrollable drift and possible saturation in the amplifier Typically values from 10 to 100 k are used A resistor from each input to ground as shown in Figure 3 5 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 Grounded Signal Source Vm Measured Voltage Vs I O Connector 1200 Series in DIFF Configuration 1 3 5 7 2 4 6 8 Common Mode Noise Ground Potential ACH0 AGND 11 ACH2 ACH4 ACH6 ACH1 ACH3 ACH5 ACH7 Vcm Chapter 3 Signal Connections National Instruments Corporation 3 15 Lab PC 1200 AI User Manual Single Ended Connection Considerations Single ended connections are those in which all 1200 Series analog input signals are referenced to one common ground The input signals
8. Journal of the Audio Engineering Society Vol 35 No 12 Dec 1987 The 1200 Series use a 12 bit successive approximation ADC The converter 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 512 words deep This FIFO serves as a buffer to the ADC The A D FIFO can collect up to 512 A D conversion values before losing any information thus allowing the software some extra time to catch up with the hardware If you store more than 512 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 output from the ADC 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 data from the ADC 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 Chapter 4 Theory of Operation Lab PC 1200 AI User Manual 4 8 National Instruments Corporation mode With this scheme the data from the ADC is interpreted as a 12 bit two s complement number with a range of 2 048 to 2 047 The output from the A
9. Technical Publications Fax to Technical Publications National Instruments Corporation National Instruments Corporation 6504 Bridge Point Parkway 512 794 5678 Austin TX 78730 5039 National Instruments Corporation G 1 Lab PC 1200 AI User Manual Numbers Symbols degrees gt greater than greater than or equal to lt less than negative of or minus ohms percent plus or minus positive of or plus Prefix Meaning Value p pico 10 12 n nano 10 9 micro 10 6 m milli 10 3 k kilo 10 3 M mega 10 6 G giga 10 9 Glossary Glossary Lab PC 1200 AI User Manual G 2 National Instruments Corporation A A amperes ACH lt 0 7 gt analog channel 0 through 7 signals ACK acknowledge input signal A D analog to digital ADC analog to digital converter AGND analog ground signal AI analog input AISENSE AIGND analog input sense analog input ground signal ANSI American National Standards Institute AO analog output AVAIL available B BBS bulletin board system BSC bisynchronous C C Celsius CH channel CLKB1 CLKB2 counter B1 B2 clock signals cm centimeters CNTINT counter interrupt signal CONV conversion Glossary National Instruments Corporation G 3 Lab PC 1200 AI User Manual CTR counter
10. National Instruments Corporation Timing Specifications Use the handshaking lines STB and IBF to synchronize input transfers Use the handshaking lines OBF and ACK to synchronize output transfers Table 3 6 lists the signals used in the timing diagrams shown later in this chapter Table 3 5 Port C Signal Assignments Programmable Mode Group A Group B PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0 Mode 0 I O I O I O I O I O I O I O I O Mode 1 Input I O I O IBFA STBA INTRA STBB IBFBB INTRB Mode 1 Output OBFA ACKA I O I O INTRA ACKB OBFB INTRB Mode 2 OBFA ACKA IBFA STBA INTRA I O I O I O Indicates that the signal is active low Table 3 6 Port C Signal Descriptions 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 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 1200 Series OBF Output Output Buffer Full A low signal on this handshaking line indicates that data has been written from the specified port Chapter 3 Signa
11. related documentation xiv E electronic support services B 1 to B 2 e mail support B 2 environment specifications A 9 equipment optional 1 5 event counting general purpose timing signal connections 3 31 with external switch gating figure 3 32 EXTCONV signal definition table 3 5 interval scanning data acquisition 3 29 to 3 30 maximum voltage input rating 3 31 posttrigger and pretrigger data acquisition 3 28 to 3 29 posttrigger data acquisition timing figure 3 28 pretrigger data acquisition timing figure 3 29 timing requirements figure 3 27 EXTTRIG signal data acquisition timing 3 27 to 3 29 definition table 3 5 maximum voltage input rating 3 31 posttrigger and pretrigger modes 3 27 to 3 28 pretrigger data acquisition timing figure 3 28 EXTUPDATE signal data acquisition timing with Lab PC 1200 3 30 definition table 3 5 maximum voltage input rating 3 31 waveform generation timing 3 30 waveform generation timing sequence figure 3 31 F fax and telephone support B 2 FaxBack support B 2 floating signal sources differential connections 3 13 to 3 14 purpose and use 3 9 single ended connections RSE configuration 3 15 to 3 16 freerun acquisition mode 4 9 frequency measurement general purpose timing signal connections 3 32 to 3 33 illustration 3 33 FTP support B 1 G GATB0 signal table 3 5 GATB1 signal table 3 6 GATB2 signal table 3 6 GATE sig
12. 3 24 mode 2 bidirectional timing figure 3 26 switchless mode 2 3 system noise A 4 to A 5 T technical support B 1 to B 2 theory of operation analog input 4 5 to 4 11 analog input circuitry 4 6 to 4 8 block diagram 4 6 controlled acquisition mode 4 8 data acquisition operations 4 8 to 4 10 data acquisition rates 4 10 to 4 11 freerun acquisition mode 4 9 interval scanning acquisition mode 4 9 multichannel scanned data acquisition 4 10 single channel data acquisition 4 9 to 4 10 analog output 4 12 to 4 13 analog output circuitry 4 12 to 4 13 DAC timing 4 13 Lab PC 1200 analog output circuitry figure 4 12 block diagram Lab PC 1200 4 1 Lab PC 1200AI 4 2 digital I O 4 13 functional overview 4 1 to 4 2 PC I O channel interface circuitry 4 2 to 4 3 timing circuitry 4 3 to 4 5 time lapse measurement 3 32 timing circuitry block diagram 4 4 theory of operation 4 3 to 4 5 timing I O specifications A 8 timing signal connections See data acquisition timing connections general purpose timing signal connections timing specifications digital I O signal connections 3 22 to 3 26 mode 1 input timing 3 24 mode 1 output timing 3 25 mode 2 bidirectional timing 3 26 U unipolar analog input signal range vs gain table 3 7 to 3 8 unpacking the Lab PC 1200 AI 1 6 W WRT signal description table 3 23 mode 1 output timing figure 3 25 mode 2 bidirectional timing fi
13. D D A digital to analog DAC digital to analog converter DAC OUTPUT UPDATE DAC output update signal DAC0OUT DAC1OUT digital to analog converter 0 1 output signals DACWRT DAC write signal DAQ data acquisition DAQD A data acquisition board data address line signal DATA data lines at the specified port signal dB decibels DC direct current DGND digital ground signal DI digital input DIFF differential DIO digital input output DMA direct memory access DMATC direct memory access terminal count DNL differential nonlinearity DO digital output E EEPROM electrically erased programmable read only memory Glossary Lab PC 1200 AI User Manual G 4 National Instruments Corporation EXTCONV external convert signal EXTTRIG external trigger signal EXTUPDATE external update signal F F farad ft feet FIFO first in first out memory buffer FSR full scale range FTP file transfer protocol G GATB lt 0 2 gt counter B0 B1 B2 gate signals GATE gate signal H hex hexadecimal Hz hertz I IBF input buffer full signal in inches INTR interrupt request signal I O input output I OUT output current Glossary National Instruments Corporation G 5 Lab PC 1200 AI User Manual IRQ interrupt request ISA industry standard architecture L LED light emitting diode LSB least significant bit
14. 056 200 51 55 Taiwan 02 377 1200 02 737 4644 U K 01635 523545 01635 523154 FaxBack Support E Mail Support currently U S only Technical Support Form Photocopy this form and update it each time you make changes to your software or hardware and use the completed copy of this form as a reference for your current configuration Completing this form accurately before contacting National Instruments for technical support helps our applications engineers answer your questions more efficiently 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 capac
15. 3 8 9 1200 Series in RSE Configuration 11 ACH1 ACH2 ACH7 Chapter 3 Signal Connections National Instruments Corporation 3 17 Lab PC 1200 AI User Manual Configuration instructions are in the Analog I O Configuration section of Chapter 2 Installation and Configuration Figure 3 7 Single Ended Input Connections for Grounded Signal Sources Common Mode Signal Rejection Considerations Figures 3 5 and 3 7 show connections for signal sources that are already referenced to some ground point with respect to the 1200 Series In these cases the instrumentation amplifier can reject any voltage caused by ground potential differences between the signal source and the 1200 Series board In addition with differential input connections the instrumentation amplifier can reject common mode noise pickup in the leads connecting the signal sources to the 1200 Series board The common mode input range of the instrumentation amplifier is the magnitude of the greatest common mode signal that it can reject The common mode input range for the 1200 Series depends on the size of the differential input signal V diff V in V in and the gain setting ACH0 Vm Measured Voltage AGND AISENSE AIGND Vs Vcm I O Connector 1200 Series in NRSE Input Configuration 1 2 3 8 9 11 ACH1 ACH2 ACH7 Ground Referenc
16. A 6 stability A 7 transfer characteristics A 6 voltage output A 6 Analog to Digital Converter ADC 4 7 to 4 8 B base I O address selection 2 3 bipolar analog input signal range vs gain table 3 7 bulletin board support B 1 bus interface specifications A 9 bus related configuration base I O address selection 2 3 DMA channel selection 2 3 interrupt channel selection 2 4 to 2 7 PC AT interrupt assignment map table 2 6 to 2 7 PC AT I O address map table 2 4 to 2 6 Plug and Play mode 2 2 to 2 3 switchless mode 2 3 C cabling custom 1 5 to 1 6 Calibrate_1200 function 5 3 calibration calibration DACs 5 1 equipment requirements 5 2 to 5 3 higher gains 5 2 methods 5 1 onboard EEPROM 5 2 overview 5 1 to 5 2 using the Calibrate_1200 function 5 3 circuitry See theory of operation CLK signals general purpose timing signal connections 3 31 to 3 35 timing requirements figure 3 34 CLKB1 signal table 3 6 CLKB2 signal table 3 6 CNTINT signal 3 30 common mode signal rejection considerations 3 17 to 3 18 configuration analog input modes DIFF 2 10 NRSE 2 10 RSE 2 10 summary table 2 9 analog I O 2 7 to 2 10 analog input polarity 2 9 analog output polarity 2 8 to 2 9 Lab PC 1200 2 7 to 2 8 Lab PC 1200AI 2 8 bus related base I O address selection 2 3 DMA channel selection 2 3 interrupt channel selection 2 4 to 2 7 PC AT interrupt assignment map table 2 6 t
17. Data is acquired both before and after the EXTTRIG signal occurs A D conversions are software enabled which initiates the data acquisition operation However the sample counter is not started until a rising edge is sensed on the EXTTRIG input 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 15 shows a pretrigger data acquisition timing sequence using EXTTRIG and EXTCONV The data acquisition operation has been initiated through software Notice that the sample counter has been tm 50 ns min EXTTRIG VIH VIL tm EXTCONV CONVERT td 50 ns min tm td Chapter 3 Signal Connections National Instruments Corporation 3 29 Lab PC 1200 AI User Manual 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 data acquisition sequence Figure 3 15 Pretrigger Data Acquisition Timing Because both pretrigger and posttrigger modes use EXTTRIG input you can only use one mode at a time 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 sa
18. 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 you configure the 1200 Series board for single ended input NRSE or RSE eight analog input channels are available Use single ended input connections when all of the input signals meet the following conditions Input signals are high level greater than 1 V Leads connecting the signals to the 1200 Series board are less than 10 ft All input signals 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 1200 Series boards 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 1200 Series boards provide 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 1200 Series boards should not supply one Single Ended Connections for Floating Signal Sources RSE Configuration Figure 3 6 shows how to connect a floating signal source to a 1200 Series board configured for RSE mode Configure the 1200 Series analog input circuitry for RSE input to make these types of connections Configuration instructions a
19. counter timers for timing I O The 1200 Series boards are completely switchless and jumperless data acquisition boards This allows DMA interrupts and base I O addresses to be assigned by your system to avoid resource conflicts with other boards in your system 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 specifications for your 1200 Series board are in Appendix A Specifications What You Need to Get Started To set up and use your 1200 Series boards you will need the following K One of the following boards Lab PC 1200 Lab PC 1200AI K Lab PC 1200 AI User Manual Chapter 1 Introduction Lab PC 1200 AI User Manual 1 2 National Instruments Corporation K One of the following software packages and documentation LabVIEW for Windows LabWindows CVI for Windows NI DAQ for PC compatibles K Your computer Software Programming Choices There are several options to choose from when programming your National Instruments DAQ and SCXI hardware You can use LabVIEW LabWindows CVI NI DAQ or register level programming LabVIEW and LabWindows CVI Application Software LabVIEW and LabWindows CVI are innovative program development software packages for data acquisition and control applications LabVIEW uses graphical programming whereas
20. figure 3 28 pretrigger timing figure 3 29 sample counter 3 27 sample interval counter 3 27 waveform generation timing sequence 3 30 to 3 31 data acquisition related configuration See analog I O configuratio n DATA signal description table 3 23 mode 1 input timing figure 3 24 mode 1 output timing figure 3 25 mode 2 bidirectional timing figure 3 26 DGND signal table 3 5 DIFF input configuration 2 10 definition table 2 9 summary of input configurations table 3 11 differential connections DIFF configuration 3 12 floating signal sources 3 13 to 3 14 ground referenced signal sources 3 12 to 3 13 purpose and use 3 12 differential nonlinearity analog input A 4 to A 5 analog output A 7 digital I O circuitry block diagram 4 13 theory of operation 4 13 digital I O signal connections illustration 3 21 logical input and output 3 20 to 3 21 pins 3 19 Port C pin connections 3 21 to 3 22 specifications and ratings 3 20 timing specifications 3 22 to 3 26 mode 1 input timing 3 24 mode 1 output timing 3 25 mode 2 bidirectional timing 3 26 digital I O specifications A 7 to A 8 digital trigger specifications A 8 Index Lab PC 1200 AI User Manual I 4 National Instruments Corporation dither circuitry 4 7 A 5 DMA channel selection 2 3 documentation conventions used in manual xii National Instruments documentation iii organization of manual xi xii
21. 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 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 National Instruments Corporation 1 1 Lab PC 1200 AI User Manual Introduction Chapter 1 This chapter describes the 1200 Series boards lists what you need to get started software programming choices and optional equipment and explains how to build custom cables and unpack your board About the Lab PC 1200 AI Thank you for purchasing the Lab PC 1200 or Lab PC 1200AI board These boards are low cost high performance analog digital and timing boards for PC AT and compatible computers Additionally the Lab PC 1200 has analog output capabilities The 1200 Series boards have eight analog input channels that you can configure as eight single ended or four differential inputs a 12 bit successive approximation ADC 24 lines of TTL compatible digital I O and three 16 bit
22. 1200 AI User Manual Data Acquisition and General Purpose Timing Signal Connections Pins 38 through 48 of the I O connector are connections for timing I O signals The 1200 Series timing input output circuitry uses two 82C53 counter timer integrated circuits One counter the 82C53 A is used exclusively for data acquisition timing and the other 82C53 B is available for general use Use pins 38 through 40 and pin 43 to carry external signals for data acquisition timing These signals are explained in the Data Acquisition Timing Connections section 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 Data Acquisition Timing Connections Each 82C53 counter timer circuit contains three counters Counter 0 on the 82C53 A counter timer referred to as A0 is a sample interval counter in timed A D conversions Counter 1 on the 82C53 A counter timer referred to as A1 is a sample counter in controlled A D conversions Therefore counter A1 stops data acquisition after a predefined number of samples These counters are not available for general use Instead of counter A0 you can use EXTCONV to externally time conversions Figure 3 13 shows the timing requirements for the EXTCONV input An A D conversion is initiated by a falling edge on EXTCONV EXTCONV can also be configured as an output and used as a strobe signal f
23. 7650 T amp B Ansley Corporation part number 609 5041CE Unpacking Your 1200 Series board 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 Ground yourself via a grounding strap or by holding a grounded object Touch the antistatic package to a metal part of your computer chassis before removing the board from the package Remove the board from the package and inspect the board for loose components or any other sign of damage Notify National Instruments if the board appears damaged in any way Do not install a damaged board into your computer Never touch the exposed pins of connectors National Instruments Corporation 2 1 Lab PC 1200 AI User Manual Installation and Configuration Chapter 2 This chapter describes how to install and configure your 1200 Series board Software Installation If you are using NI DAQ refer to your NI DAQ release notes to install your driver software Find the installation section for your operating system and follow the instructions given there If you are using LabVIEW refer to your LabVIEW release notes to install your application software After you have installed LabVIEW refer to the NI DAQ release notes and follow the instructions given there for your opera
24. AI User Manual Mode 1 Output Timing The timing specifications for an output transfer in mode 1 are as follows Figure 3 11 Mode 1 Timing Specifications for Output Transfers Name Description Minimum Maximum T1 WRT 0 to INTR 0 450 T2 WRT 1 to output 350 T3 WRT 1 to OBF 0 650 T4 ACK 0 to OBF 1 350 T5 ACK pulse width 300 T6 ACK 1 to INTR 1 350 All timing values are in nanoseconds WRT OBF INTR ACK DATA T1 T2 T3 T4 T5 T6 Chapter 3 Signal Connections Lab PC 1200 AI User Manual 3 26 National Instruments Corporation Mode 2 Bidirectional Timing The timing specifications for bidirectional transfers in mode 2 are as follows Figure 3 12 Mode 2 Timing Specification for Bidirectional Transfers Name Description Minimum Maximum T1 WRT 1 to OBF 0 650 T2 Data before STB 1 0 T3 STB pulse width 500 T4 STB 0 to IBF 1 300 T5 Data after STB 1 180 T6 ACK 0 to OBF 1 350 T7 ACK pulse width 300 T8 ACK 0 to output 300 T9 ACK 1 to output float 20 250 T10 RD 1 to IBF 0 300 All timing values are in nanoseconds T1 T6 T7 T3 T4 T10 T2 T5 T8 T9 WRT OBF INTR ACK STB IBF RD DATA Chapter 3 Signal Connections National Instruments Corporation 3 27 Lab PC
25. B0 for analog output timing If you are not using counters B0 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 B0 and B1 refer to the Analog Input section and Analog Output section Analog Input The 1200 Series boards have eight channels of analog input with software programmable gain and 12 bit A D conversion The 1200 Series boards also contain data acquisition timing circuitry for automatic timing of multiple A D conversions and include advanced options such as external triggering gating and clocking Figure 4 5 shows an analog input circuitry block diagram Chapter 4 Theory of Operation Lab PC 1200 AI User Manual 4 6 National Instruments Corporation Figure 4 5 1200 Series Analog Input Circuitry Analog Input Circuitry The analog input circuitry consists of two analog input multiplexers muxes 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 muxes has eight analog input channels channels 0 through 7 The other mux is connected to channels 1 3 5 and 7 for differential mode The input muxes provide input overvoltage protection of 35 V powered on and 25 V powered off The mux counters
26. Lab PC 1200 AI User Manual Multifunctional I O Board for the PC AT June 1996 Edition Part Number 321230A 01 Copyright 1996 National Instruments Corporation All Rights Reserved GPIB gpib support natinst com DAQ daq support natinst com VXI vxi support natinst com LabVIEW lv support natinst com LabWindows lw support natinst com HiQ hiq support natinst com VISA visa support natinst com E mail info natinst com FTP Site ftp natinst com Web Address http www natinst com BBS United States 512 794 5422 or 800 327 3077 BBS United Kingdom 01635 551422 BBS France 1 48 65 15 59 512 418 1111 Tel 512 795 8248 Fax 512 794 5678 Australia 03 9 879 9422 Austria 0662 45 79 90 0 Belgium 02 757 00 20 Canada Ontario 519 622 9310 Canada Qu bec 514 694 8521 Denmark 45 76 26 00 Finland 90 527 2321 France 1 48 14 24 24 Germany 089 741 31 30 Hong Kong 2645 3186 Italy 02 413091 Japan 03 5472 2970 Korea 02 596 7456 Mexico 95 800 010 0793 Netherlands 0348 433466 Norway 32 84 84 00 Singapore 2265886 Spain 91 640 0085 Sweden 08 730 49 70 Switzerland 056 200 51 51 Taiwan 02 377 1200 U K 01635 523545 National Instruments Corporate Headquarters 6504 Bridge Point Parkway Austin TX 78730 5039 Tel 512 794 0100 Internet Support Bulletin Board Support FaxBack Support Telephone Support U S International Offices I
27. LabWindows CVI enhances traditional programming languages Both packages include extensive libraries for data acquisition instrument control data analysis and graphical data presentation LabVIEW features interactive graphics a state of the art user interface and a powerful graphical programming language The LabVIEW Data Acquisition VI Library a series of VIs for using LabVIEW with National Instruments DAQ hardware is included with 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 The 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 Using LabVIEW or LabWindows CVI software will greatly reduce the development time for your data acquisition and control application Chapter 1 Introduction National Instruments Corporation 1 3 Lab PC 1200 AI User Manual 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 p
28. Series boards use two counters counter A0 and counter A1 to execute data acquisition operations in controlled acquisition mode Counter A0 is used as a sample interval counter while counter A1 is used as a sample counter In controlled acquisition mode the board performs a specified number of conversions and then the hardware shuts off the conversions Counter A0 generates the conversion pulses and counter A1 gates off counter A0 after the programmed count has expired The number of conversions in a single controlled acquisition mode data acquisition operation is limited to a 16 bit count 65 535 conversions Chapter 4 Theory of Operation National Instruments Corporation 4 9 Lab PC 1200 AI User Manual Freerun Acquisition Mode The 1200 Series boards use one counter counter A0 to execute data acquisition operations in freerun acquisition mode Counter A0 continuously generates the conversion pulses as long as GATEA0 is held at a high logic level The software keeps track of the number of conversions that have occurred and turns off counter A0 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 data acquisition operation is unlimited Interval Scanning Acquisition Mode The 1200 Series boards use two counters for interval scanning data acquisition Counter B1 times the scan interval Counter A0
29. 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 in a 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 I O Number of channels 24 I O three 8 bit ports uses the 82C55A PPI Compatibility TTL Power on state All ports mode 0 input Digital logic levels Level Min Max Input low voltage 0 3 V 0 8 V Input high voltage 2 2 V 5 3 V Output low voltage I OUT 2 5 mA 0 4 V Output high voltage I OUT 40 A 4 2 V IOUT 2 5 mA 3 7 V Appendix A Speci cations Lab PC 1200 AI User Manual A 8 National Instruments Corporation Protection 0 5 V to 5 5 V powered on 0 5 V powered off Data transfers
30. are digital I O signal pins Digital I O on the 1200 Series boards 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 0 7 gt for digital I O port A Pins 22 through 29 are connected to the digital lines PB lt 0 7 gt for digital I O port B Pins 30 through 37 are connected to the digital lines PC lt 0 7 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 signal voltage and current specifications The logical input and output specifications and ratings apply to the digital I O lines All voltages are with respect to DGND 10 DAC0OUT Analog Output Channel 1 Analog Output Channel 0 Lab PC 1200 Board DAC1OUT AGND 11 12 VOUT 1 VOUT 0 Load Load I O Connector Chapter 3 Signal Connections Lab PC 1200 AI User Manual 3 20 National Instruments Corporation Logical Input and Output Absolute maximum voltage rating 0 5 to 5 5 V with respect to DGND 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 sink current 2 5 mA Output
31. connections 3 12 floating signal sources 3 13 to 3 14 grounded referenced signal sources 3 12 to 3 13 single ended connections 3 15 exceeding maximum input voltage ratings 3 7 floating signal sources 3 9 ground referenced signal sources 3 9 to 3 10 input configurations 3 10 to 3 18 input signal range versus gain table bipolar 3 7 unipolar 3 7 to 3 8 instrumentation amplifier 3 8 pins 3 6 single ended connections floating signal sources RSE configuration 3 15 to 3 16 grounded signal sources NRSE configuration 3 16 to 3 17 summary of input configurations table 3 11 types of signal sources 3 9 to 3 10 analog input specifications A 1 to A 3 amplifier characteristics A 2 dynamic characteristics A 3 explanation A 4 to A 5 input characteristics A 1 to A 2 stability A 3 transfer characteristics A 2 analog I O configuration analog input modes DIFF 2 9 NRSE 2 10 RSE 2 10 summary table 2 10 analog input polarity 2 9 Index Lab PC 1200 AI User Manual I 2 National Instruments Corporation analog output polarity 2 8 to 2 9 Lab PC 1200 default configuration 2 7 settings table 2 7 to 2 8 Lab PC 1200AI default configuration 2 8 settings table 2 8 analog output circuitry block diagram 4 12 theory of operation 4 12 to 4 13 analog output signal connections 3 18 to 3 19 analog output specifications A 6 to A 7 dynamic characteristics A 6 explanation A 7 output characteristics
32. explains the theory of operation of each of the 1200 Series components Calibration circuitry is discussed in Chapter 5 Calibration PC I O Channel Interface Circuitry The PC I O channel consists of an address bus a data bus a DMA arbitration bus interrupt lines and several control and support signals The components making up the 1200 Series boards interface circuitry are shown in Figure 4 3 3 8 16 8 I O Connector PC I O Channel Dither Calibration 4 1 MHz Timebase 10 MHz Oscillator Time Divider 2 MHz Timebase Digital Control Logic ISA Pnp Chip 82C53 Counter Timer Group A 82C55A Digital Interface 82C53 Counter Timer Group B Program Gain 12 Bit A D FIFO Input Mux 24 8 Address Data Control Interrupt 1 4 8 5 Address 17 Data 8 Control 4 DMA 3 Interrupt 1 DMA 3 Chapter 4 Theory of Operation National Instruments Corporation 4 3 Lab PC 1200 AI User Manual Figure 4 3 PC Interface Circuitry The 1200 Series boards generate an interrupt in the following cases each of these interrupts is individually enabled and cleared When a single A D conversion can be read from the A D FIFO memory When the A D FIFO is half full When a data acquisition operation completes including when either an OVERFLOW or an OVERRUN error occurs When the digital I O circuitry generates a
33. input signals and the timing specifications for the 82C53 OUT output signals Chapter 3 Signal Connections National Instruments Corporation 3 35 Lab PC 1200 AI User Manual Figure 3 20 General Purpose Timing Signals The GATE and OUT signals in Figure 3 20 are referenced to the rising edge of the CLK signal 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 you remove the overcurrent condition Pin 49 is referenced to DGND and you can use the 5 V to power external digital circuitry Power rating 1 A at 4 65 to 5 25 V Warning Do not directly connect this 5 V power pin to analog or digital ground or to any other voltage source on the 1200 Series or any other device Doing so can damage the 1200 Series board or your computer National Instruments is NOT liable for any damage due to incorrect power connections tsc tpwh tpwl tgsu tgh tgwh tgwl toutc toutg CLK GATE OUT VOH VIH VIL VIH VOL VIL tsc tpwh tpwl tgsu tgh tgwh tgwl toutg toutc clock period clock high level clock low level gate setup time gate hold time gate high level gate low level output delay from clock output delay from gate 380 ns minimum 230 ns minimum 150 ns minimum 100 ns minimum 50 ns minimum 150 ns minimum 100 ns minimum 300 ns maxi
34. logic high voltage 3 7 V min at output source current 2 5 mA Input leakage current 1 A min 1 A max 0 lt V in lt 5 V Figure 3 9 illustrates signal connections for three typical digital I O applications Chapter 3 Signal Connections National Instruments Corporation 3 21 Lab PC 1200 AI User Manual Figure 3 9 Digital I O Connections In Figure 3 9 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 Figure 3 9 Digital output applications include sending TTL signals and driving external devices such as the LED shown in Figure 3 9 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 14 PA0 22 PB0 30 PC0 13 DGND 1200 Series Switch I O Connector 5 V 5 V LED TTL Signal Port B PB lt 7 0 gt Port A PA lt 7 0 gt Port C PC lt 7 0 gt Complex switch circuitry is not shown in order to simplify the figure Chapter 3 Signal Connections Lab PC 1200 AI User Manual 3 22
35. 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 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 SCXI 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 and 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 manuals or the NI DAQ documentation to help you write your application If you have a large and complicated system it is worthwhile to look through the software documentation before you configure your hardware Acces
36. time that elapses between successive A D conversions The sample interval is controlled either externally by EXTCONV or internally by counter A0 Chapter 4 Theory of Operation Lab PC 1200 AI User Manual 4 10 National Instruments Corporation 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 1200 Series boards execute a multichannel data acquisition 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 1200 Series board scans the start channel the highest numbered channel first then the next highest numbered channel and so on until it scans channel 0 It repeats these scan sequences until the data acquisition operation stops For example if channel 3 is specified as the start channel the scan sequence is as follows ch3 ch2 ch1 ch0 ch3 ch2 ch1 ch0 ch3 ch2 To specify the scan sequence for a multichannel scanned analog input operation you select the start channel for the scan sequence and a gain setting Data Acquisition Rates Maximum data acquisition rates number of samples per second are determined by the ADC conversion
37. 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 scan interval LabVIEW LabWindows CVI and NI DAQ support only multichannel interval scanning Single channel interval scanning is available only through register level programming 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 s sample channel 0 then repeat this process every 65 ms Then define the operation as follows Start channel ch1 which gives a scan sequence of ch1 ch0 Sample interval 12 s 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 s your sample interval must be at least this value to ensure proper operation Single Channel Data Acquisition The 1200 Series boards execute 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
38. 8 45 46 43 44 41 42 39 40 37 38 35 36 33 34 31 32 29 30 27 28 25 26 23 24 21 22 19 20 17 18 15 16 13 14 11 12 9 10 7 8 5 6 3 4 1 2 Chapter 3 Signal Connections National Instruments Corporation 3 3 Lab PC 1200 AI User Manual Figure 3 2 Lab PC 1200AI I O Connector Pin Assignments 5 V GATB2 CLKB1 OUTB1 OUTB0 NC PC7 PC5 PC3 PC1 PB7 PB5 PB3 PB1 PA7 PA5 PA3 PA1 DGND AGND AISENSE AIGND ACH6 ACH4 ACH2 ACH0 DGND OUTB2 GATB1 EXTCONV EXTTRIG PC6 PC4 CLKB2 GATB0 PC2 PC0 PB6 PB4 PB2 PB0 PA6 PA4 PA2 PA0 NC NC ACH7 ACH5 ACH3 ACH1 49 50 47 48 45 46 43 44 41 42 39 40 37 38 35 36 33 34 31 32 29 30 27 28 25 26 23 24 21 22 19 20 17 18 15 16 13 14 11 12 9 10 7 8 5 6 3 4 1 2 Chapter 3 Signal Connections Lab PC 1200 AI User Manual 3 4 National Instruments Corporation I O Connector Signal Descriptions Table 3 1 lists the connector pins on the 1200 Series boards I O connectors by pin number and gives each signal name and signal connector pin description Table 3 1 Signal Descriptions for 1200 Series I O Connector Pins Pin Signal Name Direction Reference Description 1 8 ACH lt 0 7 gt AI AGND Analog Channel 0 through 7 Analog input channels 0 through 7 Each channel pair ACH i i 1 lt i 0 6 gt can be configured
39. DC 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 sign Thus data values read from the FIFO are 16 bits wide Data Acquisition Operations This manual uses the phrase data acquisition operation to refer to a sequence of timed A D conversions The 1200 Series boards perform data acquisition operations in one of three modes controlled acquisition mode freerun acquisition mode and interval scanning acquisition mode The 1200 Series boards perform both single channel and multichannel scanned data acquisition The data acquisition timing circuitry consists of various clocks and timing signals that control the data acquisition operation data acquisition timing consists of signals that initiate a data acquisition operation time the individual A D conversions gate the data acquisition operation and generate scanning clocks The data acquisition operation can be timed either by the timing circuitry or by externally generated signals These two timing modes are software configurable Data acquisition operations are initiated either externally through EXTTRIG or through software The data acquisition operation is terminated either internally by counter A1 of the 82C53 A counter timer circuitry which counts the total number of samples taken during a controlled operation or through software in a freerun operation Controlled Acquisition Mode The 1200
40. 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 shall National Instruments be liable for any damages arising out of or related to this document or the information contained in it E XCEPT AS SPECIFIED HEREIN N ATIONAL I NSTRUMENTS MAKES NO WARRANTIES EXPRESS OR IMPLIED AND SPECIFICALLY DISCLAIMS ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE C USTOMER S RIGHT TO RECOVER DAMAGES CAUSED BY FAULT OR NEGLIGENCE ON THE PART OF N ATIONAL I NSTRUMENTS SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER N ATIONAL I NSTRUMENTS 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 Instrumen
41. M max maximum MB megabytes of memory min minimum min minutes MIO multifunction I O mux multiplexer N N A not applicable NC not connected NRSE nonreferenced single ended O OBF output buffer full signal OUTB0 OUTB1 counter B0 B1 output signals OVERFLOW overflow error OVERRUN overrun error Glossary Lab PC 1200 AI User Manual G 6 National Instruments Corporation P PA PB PC lt 0 7 gt port A B or C 0 through 7 signals PC personal computer Pgm program POSTTRIG posttrigger mode PnP Plug and Play PPI programmable peripheral interface ppm parts per million PRETRIG pretrigger mode R RD read signal REQ request RMA return material authorization rms root mean square RSE referenced single ended RTD resistance temperature detector S s seconds S samples SCXI signal conditioning eXtensions for instrumentation bus STB strobe input signal Glossary National Instruments Corporation G 7 Lab PC 1200 AI User Manual T t d minimum period t gh gate hold time t gsu gate setup time t gwh gate high level t gwl gate low level t m minimum pulse width t outc output delay from gate t outg output delay from clock t pwh clock high level t pwl clock low level t sc clock period TTL transistor transis
42. RSE input configuration 2 10 definition table 2 9 single ended connections for floating signal sources 3 15 to 3 16 summary of input configurations table 3 11 S sample counter 3 27 sample interval counter 3 27 signal connections analog input signal connections common mode signal rejection 3 17 to 3 18 Index National Instruments Corporation I 7 Lab PC 1200 AI User Manual differential connections 3 12 floating signal sources 3 13 to 3 14 ground referenced signal sources 3 12 to 3 13 single ended connections 3 15 exceeding maximum input voltage ratings warning 3 7 floating signal sources 3 9 ground referenced signal sources 3 9 to 3 10 input configurations 3 10 to 3 18 input ranges and maximum ratings 3 7 instrumentation amplifier 3 8 to 3 9 pins 3 6 single ended connections floating signal sources RSE configuration 3 15 to 3 16 grounded signal sources NRSE configuration 3 16 to 3 17 summary of input configurations table 3 11 types of signal sources 3 9 to 3 10 analog output signal connections 3 18 to 3 19 DAQ and general purpose timing signal connections data acquisition timing connections 3 27 to 3 31 general purpose timing connections 3 31 to 3 35 pins 3 27 power connections 3 35 digital I O signal connections illustration 3 21 logical input and output 3 20 to 3 21 pins 3 19 Port C pin connections 3 21 to 3 22 specifications and ratings 3 20 timing specifi
43. V or the powered off voltage rating of 25 V The 1200 Series board is guaranteed to withstand inputs up to the maximum input voltage rating Warning Exceeding the input signal range even on unused analog input channels distorts input signals Exceeding the maximum input voltage rating can damage the 1200 Series 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 5 0 to 1 99951 V 10 0 to 999 756 mV 20 0 to 499 877 mV Chapter 3 Signal Connections Lab PC 1200 AI User Manual 3 8 National Instruments Corporation How you connect analog input signals to your 1200 Series board depends on how you configure the board s analog input circuitry and the type of input signal source With different board configurations you can use the 1200 Series instrumentation amplifier in different ways Figure 3 3 shows a diagram of the 1200 Series instrumentation amplifier Figure 3 3 1200 Series Instrumentation Amplifier The instrumentation a
44. ________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ 1200 Series 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 National Instruments for technical support helps our applications engineers answer your questions more efficiently National Instruments Products Serial number ________________________________________________________________ Interrupt level ________________________________________________________________ DMA channels _______________________________________________________________ Base I O address ______________________________________________________________ NI DAQ LabVIEW or LabWindows CVI version ___________________________________ Other Products Computer make and model ______________________________________________________ Microprocessor _______________________________________________________________ Clock frequency or speed _______________________________________________________ Amount of memory _____
45. _____________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ 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 ________________________________________________________________________ _______________________________________________________________________________ Phone _____________________________________________________________________ Mail to
46. _______________________________________________________ Type of video board installed ____________________________________________________ Operating system ______________________________________________________________ Operating system version _______________________________________________________ Programming language _________________________________________________________ Programming language version __________________________________________________ Other boards in system _________________________________________________________ Base I O addresses of other boards ________________________________________________ DMA channels of other boards ___________________________________________________ Interrupt levels 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 Lab PC 1200 AI User Manual Edition Date June 1996 Part Number 321230A 01 Please comment on the completeness clarity and organization of the manual _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ __________________________________________
47. alibration Calibration at Higher Gains 5 2 Calibration Equipment Requirements 5 2 Using the Calibration Function 5 3 Appendix A Specifications Appendix B Customer Communication Glossary Index Table of Contents Lab PC 1200 AI User Manual viii National Instruments Corporation Figures Figure 1 1 The Relationship between the Programming Environment NI DAQ and Your Hardware 1 4 Figure 3 1 Lab PC 1200 I O Connector Pin Assignments 3 2 Figure 3 2 Lab PC 1200AI I O Connector Pin Assignments 3 3 Figure 3 3 1200 Series Instrumentation Amplifier 3 8 Figure 3 4 Differential Input Connections for Grounded Signal Sources 3 13 Figure 3 5 Differential Input Connections for Floating Sources 3 14 Figure 3 6 Single Ended Input Connections for Floating Signal Sources 3 16 Figure 3 7 Single Ended Input Connections for Grounded Signal Sources 3 17 Figure 3 8 Analog Output Signal Connections
48. as either one differential input or two single ended inputs 9 AISENSE AIGND I O AGND Analog Input Sense Analog Input Ground Connected to AGND in RSE mode analog input sense in NRSE mode 10 DAC0OUT NC AO AGND Digital to Analog Converter 0 Output Lab PC 1200 only Voltage output signal for analog output channel 0 No Connect Lab PC 1200AI only This pin is a low impedance to ground 11 AGND N A N A Analog Ground Analog output ground reference for analog output voltages Bias current return point for differential measurements 12 DAC1OUT NC AO AGND Digital to Analog Converter 1 Output Lab PC 1200 only Voltage output signal for analog output channel 1 No Connect Lab PC 1200AI only This pin is a low impedance to ground Chapter 3 Signal Connections National Instruments Corporation 3 5 Lab PC 1200 AI User Manual 13 50 DGND N A N A Digital Ground Voltage ground reference for the digital signals and the 5 V supply 14 21 PA lt 0 7 gt DIO DGND Port A 0 through 7 Bidirectional data lines for port A PA7 is the MSB and PA0 is the LSB 22 29 PB lt 0 7 gt DIO DGND Port B 0 through 7 Bidirectional data lines for port B PB7 is the MSB and PB0 is the LSB 30 37 PC lt 0 7 gt DIO DGND Port C 0 through 7 Bidirectional data lines for port C PC7 is the MSB and PC0 is the LSB 38 EXTTRIG DI DGND External Trigger External contr
49. bes how to install and configure your 1200 Series board Chapter 3 Signal Connections describes how to make input and output signal connections to the 1200 Series boards 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 1200 Series boards Chapter 5 Calibration discusses the calibration procedures for the 1200 Series analog I O circuitry Appendix A Specifications lists the specifications for the 1200 Series boards Appendix B Customer Communication contains forms you can use to request help from National Instruments or to comment on our products About This Manual Lab PC 1200 AI User Manual xii National Instruments Corporation The Glossary contains an alphabetical list and description of terms used in this manual including abbreviations acronyms metric prefixes mnemonics and symbols The Index contains an alphabetical list of key terms and topics in this manual including the page where you can find each one Conventions Used in This Manual The following conventions are used in this manual The symbol indicates that the text following it applies only to a specific 1200 Series board lt gt Angle brackets containing numbers separated by an ellipses represent a range of values a
50. cations 3 22 to 3 26 mode 1 input timing 3 24 mode 1 output timing 3 25 mode 2 bidirectional timing 3 26 I O connector exceeding maximum ratings warning 3 1 pin assignments Lab PC 1200 figure 3 2 Lab PC 1200AI figure 3 3 signal descriptions table 3 4 to 3 6 signal sources See floating signal sources ground referenced signal sources single channel data acquisition 4 9 to 4 10 single ended connections floating signal sources RSE configuration 3 15 to 3 16 ground referenced signal sources NRSE configuration 3 16 to 3 17 purpose and use 3 15 when to use 3 15 software installation 2 1 software programming choices LabVIEW and LabWindows CVI software 1 2 NI DAQ driver software 1 3 to 1 4 register level programming 1 4 specifications analog input A 1 to A 3 amplifier characteristics A 2 dynamic characteristics A 3 explanation A 4 to A 5 input characteristics A 1 to A 2 stability A 3 transfer characteristics A 2 analog output A 6 to A 7 dynamic characteristics A 6 explanation A 7 output characteristics A 6 stability A 7 transfer characteristics A 6 voltage output A 6 Index Lab PC 1200 AI User Manual I 8 National Instruments Corporation bus interface A 9 digital I O A 7 to A 8 digital trigger A 8 environment A 9 physical A 9 power requirements A 9 timing I O A 8 square wave generation 3 31 STB signal description table 3 22 mode 1 input timing figure
51. control the input muxes The 1200 Series 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 data acquisition starts These gain and mux settings remain constant during the entire data acquisition process For multichannel scanned data acquisition you select the highest numbered channel and gain before data acquisition starts 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 sequence Sample and Hold Amp DAQ Timing Gain Select Mux Counter Pro grammable Gain Amp ADC A D FIFO External Trigger Counter Timer Signals WRT RD CONV AVAIL A D RD OUTB1 EXTTRIG ACH0 ACH1 ACH2 ACH3 ACH4 ACH5 ACH6 ACH7 12 12 8 6 A D Data Data Data GAIN0 GAIN1 GAIN2 CONVERT Mux ACH1 ACH3 ACH5 ACH7 AISENSE AIGND External Scan Interval Dither Circuitry Dither Enable Dither PC I O Channel Digital Control Logic ISA PnP Chip Address Data Control Interrupt 1 4 8 DMA 3 5 I O Connector Mux Address 17 Data 8 Control 4 DMA 3 Interrupt 1 Chapter 4 Theory of Operation Nat
52. cupy 32 bytes of address space and must be located on a 32 byte boundary Therefore valid addresses include 100 120 140 3C0 3E0 hex This selection is software configured and does not require you to manually change any board settings DMA Channel Selection The 1200 Series boards can use one DMA channel for data transfers with the analog input section of the board The 1200 Series boards can use DMA channels 1 or 3 These selections are all software configured and do not require you to manually change any board settings Chapter 2 Installation and Con guration Lab PC 1200 AI User Manual 2 4 National Instruments Corporation Interrupt Channel Selection The 1200 Series boards can increase bus efficiency by using an interrupt channel You can use an interrupt channel for event notification without the use of polling techniques The 1200 Series boards can use interrupt channels 3 4 5 7 or 9 These selections are all software configured and do not require you to manually change any board settings Tables 2 1 and 2 2 provide information concerning possible resource conflicts when configuring your 1200 Series board Table 2 1 PC AT I O Address Map I O Address Range Hex Device 100 to 1EF Unreserved 1F0 to 1FF IBM PC AT Fixed Disk 200 to 20F PC and PC AT Game Controller reserved 210 to 213 PC DIO 24 default 218 to 21F Unreserved 220 to 23F Previous generation of AT MIO boards defau
53. d also recalibrate the analog output circuitry at 6 month intervals There are four ways to calibrate your board If you have LabVIEW use the 1200 Calibrate VI This VI is located in the Calibration and Configuration palette If you have LabWindows CVI use the Calibrate_1200 function Use the NI DAQ Calibrate_1200 function This function is also used for the SCXI 1200 module which is functionally equivalent to the 1200 Series boards This is the simplest method Use your own register level writes to the calibration DACs and the EEPROM To calibrate using the last method you need to know the details of the calibration process This information is in the Lab PC 1200 AI Register Level Programmer Manual Use the last calibration method only if NI DAQ does not support your operating system The 1200 Series boards are software calibrated The calibration process involves reading offset and gain errors from the analog input section also the analog output section if you have a Lab PC 1200 and writing values to the appropriate calibration DACs to null the errors There are four calibration DACs associated with the analog input section Lab PC 1200 The Lab PC 1200 has an additional four calibration DACs associated with the analog output section two for each output channel After the calibration process is complete each calibration DAC is at a known value Because th
54. e connections input signals can float within the common mode limits of the input instrumentation amplifier Differential Connections for Ground Referenced Signal Sources Figure 3 4 shows how to connect a ground referenced signal source to a 1200 Series board configured for DIFF input Configuration instructions are in the Analog I O Configuration section in Chapter 2 Installation and Configuration Chapter 3 Signal Connections National Instruments Corporation 3 13 Lab PC 1200 AI User Manual Figure 3 4 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 1200 Series ground shown as V cm in Figure 3 4 Differential Connections for Nonreferenced or Floating Signal Sources Figure 3 5 shows how to connect a floating signal source to a 1200 Series board configured for DIFF input Configuration instructions are in the Analog I O Configuration section in Chapter 2 Installation and Configuration Grounded Signal Source Vm Measured Voltage Vs I O Connector 1200 Series in DIFF Configuration 1 3 5 7 2 4 6 8 Common Mode Noise Ground Potential ACH0 AGND 11 ACH2 ACH4 ACH6 ACH1 ACH3 ACH5 ACH7 Vcm
55. e 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 substitute for any form of established process procedure or equipment used to monitor or safeguard human health and safety in medical or clinical treatment National Instruments Corporation v Lab PC 1200 AI User Manual Table of Contents About This Manual Organization of This Manual xi Conventions Used in This Manual xii National Instruments Documentation xiii Related Documentation xiv Customer Comm
56. ed Signal Source Common Mode Noise and so on Chapter 3 Signal Connections Lab PC 1200 AI User Manual 3 18 National Instruments Corporation 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 In differential or NRSE mode the negative input AISENSE should remain within 5 V bipolar input range or 5 to 2 V unipolar input range of AGND The positive input should remain within 5 V to 10 V of AGND Analog Output Signal Connections Lab PC 1200 Pins 10 through 12 on the I O connector are analog output signal pins Pins 10 and 12 are the DAC0OUT and DAC1OUT signal pins DAC0OUT is the voltage output signal for analog output channel 0 DAC1OUT 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 Output signal range Bipolar output 5 V Unipolar output 0 to 10 V Maximum load current 2 mA for 12 bit linearity Figure 3 8 shows how to make analog output signal connections Chapter 3 Signal Connections National Instruments Corporation 3 19 Lab PC 1200 AI User Manual Figure 3 8 Analog Output Signal Connections Digital I O Signal Connections Pins 13 through 37 of the I O connector
57. erefore when you are recalibrating your 1200 Series board 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 1200 Series boards are factory calibrated at all gains and NI DAQ automatically loads the correct values into the calibration DACs whenever you switch gains Calibration Equipment Requirements The equipment you use to calibrate your 1200 Series board should have a 0 001 rated accuracy which is 10 times as accurate as the board However calibration equipment with only four times the accuracy as the board and a 0 003 rated accuracy is acceptable The inaccuracy Chapter 5 Calibration National Instruments Corporation 5 3 Lab PC 1200 AI User Manual of the calibration equipment results only in gain error offset error is unaffected Calibrate your 1200 Series board 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 Voltage 0 to 10 V Accuracy 0 001 standard 0 003 acceptable Using the Calibration Function NI DAQ contains the Calibrate_1200 function with which you can either load the calibration DACs wit
58. ese systems does not answer your questions we offer fax and telephone support through our technical support centers which are staffed by applications engineers Electronic Services National Instruments has BBS and FTP sites dedicated for 24 hour support with a collection of files and documents to answer most common customer questions From these sites you can also download the latest instrument drivers updates and 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 or 800 327 3077 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 1 48 65 15 59 Up to 9 600 baud 8 data bits 1 stop bit no parity 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 Bulletin Board Support FTP Support FaxBack is a 24 hour information retrieval system containing a library of documents on a wide range of technical information You can access FaxBack from a touch tone telephone at the following number 512 418 1111 You can submit technical support questions to the appropriate applicati
59. ese values are lost when the board is powered Chapter 5 Calibration Lab PC 1200 AI User Manual 5 2 National Instruments Corporation 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 outlined in the Lab PC 1200 AI Register Level Programmer Manual When the board is powered on or the conditions under which it is operating change you must load the calibration DACs with the appropriate calibration constants If you use your 1200 Series board with NI DAQ LabVIEW or LabWindows CVI the factory calibration constants are automatically loaded into the calibration DAC the first time a function pertaining to the board 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 board and load these constants directly into the calibration DACs Calibration software is included with the 1200 Series as part of the NI DAQ software Calibration at Higher Gains The 1200 Series boards have a maximum gain error of 0 8 This means that if the board is calibrated at a gain of 1 and if the gain is switched to 100 a maximum of 32 LSB error may result in the reading Th
60. for ground referenced signal sources 3 16 to 3 17 summary of input configurations table 3 11 O OBF signal description table 3 22 mode 1 output timing figure 3 25 mode 2 bidirectional timing figure 3 26 operation of Lab PC 1200 AI See theory of operation OUT signals general purpose timing signal connections 3 31 to 3 35 timing requirements figure 3 34 OUTB0 signal table 3 5 OUTB1 signal definition table 3 5 interval scanning data acquisition 3 29 maximum voltage input rating 3 31 OUTB2 signal table 3 6 P PA lt 0 7 gt signal table 3 5 PB lt 0 7 gt signal table 3 5 PC I O channel interface circuitry 4 2 to 4 3 PC lt 0 7 gt signal table 3 5 physical specifications A 9 Plug and Play mode 2 2 to 2 3 polarity analog input polarity 2 9 analog output polarity 2 8 to 2 9 Port C signal assignments table 3 22 POSTTRIG mode 3 27 to 3 28 posttrigger data acquisition timing figure 3 28 power connections 3 35 power requirement specifications A 9 PRETRIG mode 3 28 pretrigger data acquisition timing figure 3 29 programmable gain amplifier 4 7 pulse generation 3 31 pulse width measurement 3 32 R RD signal description table 3 23 mode 1 input timing figure 3 24 mode 2 bidirectional timing figure 3 26 referenced single ended mode See RSE input register level programming 1 4 relative accuracy analog input A 4 analog output A 7
61. grammable 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 1200 Series I O connector Figure 4 7 shows the digital I O circuitry Figure 4 7 Digital I O Circuitry All three ports on the 82C55A are TTL compatible When enabled the digital output ports can sink 2 5 mA of current and can source 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 1 LSB 10 V 4 095 82C55A Programmable Peripheral Interface DIO RD WRT DATA lt 0 7 gt PC0 PC3 PC lt 0 7 gt PB lt 0 7 gt PA lt 0 7 gt I O Connector 2 8 8 8 Digital Control Logic PC I O Channel ISA PnP Chip Address Data Control Interrupt 1 4 8 5 Address 17 Data 8 Control 4 DMA 3 Interrupt 1 DMA 3 National Instruments Corporation 5 1 Lab PC 1200 AI User Manual Calibration Chapter 5 This chapter discusses the calibration procedures for the 1200 Series analog I O circuitry However the 1200 Series boards are factory calibrated and National Instruments can recalibrate your board if needed To maintain the 12 bit accuracy of the board analog input circuitry recalibrate at 6 month intervals If you have a Lab PC 1200 you shoul
62. gure 3 26
63. h 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 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 Lab PC 1200 To calibrate the analog output section the DAC0 and DAC1 outputs must be wrapped back and applied to two other analog input channels To calibrate the analog input on your 1200 Series boards first configure the ADC for RSE mode and for the correct polarity at which you want to perform data acquisition Lab PC 1200 To calibrate the analog output first configure the analog input circuitry for RSE and for bipolar polarity then configure the analog output circuitry for the polarity at which you want to perform output waveform generation Refer to the NI DAQ Function Reference Manual for PC Compatibles for more details on the Calibrate_1200 function National Instruments Corporation A 1 Lab PC 1200 AI User Manual Specifications Appendix A This appendix lists the specifications for the 1200 Series boards These specifications are typical at 25 C unless otherwise stated Analog Input Input Characteristics Number of channels E
64. he 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 Lab PC 1200 The EXTUPDATE line is susceptible to noise caused by switching lines and could generate false interrupts The width of the EXTUPDATE pulse should therefore be as short as possible but greater than 50 ns Figure 3 17 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 The CNTINT signal interrupts the computer The rising edge of EXTUPDATE generates this interrupt DACWRT is the signal that writes a new value to the DAC OUTB1 EXTCONV CONVERT GATE tm 50 ns tm 50 ns ADC CH CH1 CH0 CH1 CH0 Chapter 3 Signal Connections National Instruments Corporation 3 31 Lab PC 1200 AI User Manual Figure 3 17 EXTUPDATE Signal Timing for Updating DAC Output The following rating applies to the EXTCONV EXTTRIG OUTB1 and EXTUPDATE signals Absolute maximum 0 5 to 5 5 V with respect voltage input rating to DGND For more informa
65. ies board in place 7 Check the installation 8 Replace the top cover on the computer Your 1200 Series board is installed You are now ready to configure your board Hardware Configuration The 1200 Series boards are completely software configurable Two types of configuration are performed on the board bus related and data acquisition related Bus related configuration includes setting the base I O address DMA channel and interrupt channel Data acquisition related configuration includes such settings as analog I O polarity selection range selection digital I O configuration and other settings For more information about data acquisition related configuration refer to your NI DAQ documentation Bus Related Configuration Your 1200 Series board works in either a Plug and Play mode or a switchless mode These modes dictate how the base I O address DMA channel and interrupt channel are determined and assigned to the board Plug and Play Mode The 1200 Series boards are fully compatible with the industry standard Intel Microsoft Plug and Play Specification version 1 0 Your Plug and Play system arbitrates and assigns resources through software freeing you from manually setting switches and jumpers These resources include the board base I O address DMA channel and interrupt channel The 1200 Series boards are configured at the factory to request these resources from the Plug and Play Configuration Manager Chap
66. ight single ended eight pseudodifferential or four differential software selectable Type of ADC Successive approximation Resolution 12 bits 1 in 4 096 Max sampling rate 100 kS s single channel Input coupling DC Max working voltage signal common mode In differential or NRSE mode the negative input AISENSE should remain within 5 V bipolar input range or Input signal ranges Board Gain Software Selectable Board Range Software Selectable 5 V 0 to 10 V 1 5 V 0 to 10 V 2 2 5 V 0 to 5 V 5 1 V 0 to 2 V 10 500 mV 0 to 1 V 20 250 mV 0 to 500 mV 50 100 mV 0 to 200 mV 100 50 mV 0 to 100 mV Appendix A Speci cations Lab PC 1200 AI User Manual A 2 National Instruments Corporation 5 to 2 V unipolar input range of AGND The positive input should remain within 5 V to 10 V of AGND Overvoltage protection 35 V powered on 25 V powered off Inputs protected ACH lt 0 7 gt FIFO buffer size 512 S Data transfers DMA interrupts programmed I O Dither
67. in 11 AGND is the bias current return point for differential measurements Pins 1 through 8 are tied to the eight single ended analog input channels of the input multiplexer through 4 7 k series resistors Pins 2 4 6 and 8 are also tied to an input multiplexer for DIFF mode 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 counter 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 Indicates that the signal is active low AI Analog Input DI Digital Input DIO Digital Input Output NC Not Connected AO Analog Output DO Digital Output N A Not Applicable Table 3 1 Signal Descriptions for 1200 Series I O Connector Pins Continued Pin Signal Name Direction Reference Description Chapter 3 Signal Connections National Instruments Corporation 3 7 Lab PC 1200 AI User Manual The signal ranges for inputs ACH lt 0 7 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 you don t exceed the maximum powered on input voltage rating of 35
68. ion 2 2 Bus Related Configuration 2 2 Plug and Play Mode 2 2 Switchless Mode 2 3 Base I O Address Selection 2 3 DMA Channel Selection 2 3 Interrupt Channel Selection 2 4 Data Acquisition Related Configuration 2 7 Analog I O Configuration 2 7 Analog Output Polarity 2 8 Analog Input Polarity 2 9 Table of Contents Lab PC 1200 AI User Manual vi National Instruments Corporation Analog Input Mode 2 9 RSE Input Eight Channels Reset Condition 2 10 NRSE Input Eight Channels 2 10 DIFF Input Four Channels 2 10 Chapter 3 Signal Connections I O Connec
69. ional Instruments Corporation 4 7 Lab PC 1200 AI User Manual The programmable gain amplifier applies gain to the input signal allowing an analog input signal to be amplified before being sampled and converted thus increasing measurement resolution and accuracy The instrumentation amplifier gain is software selectable The 1200 Series boards provide gains of 1 2 5 10 20 50 and 100 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 addition is useful for applications involving averaging to increase the resolution of the 1200 Series to more than 12 bits as in calibration In such applications which are often lower frequency noise modulation decreases and differential linearity improves by adding 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 Stanley P Lipshitz
70. ircuitry 4 3 Figure 4 4 1200 Series Timing Circuitry 4 4 Figure 4 5 1200 Series Analog Input Circuitry 4 6 Figure 4 6 Lab PC 1200 Analog Output Circuitry 4 12 Figure 4 7 Digital I O Circuitry 4 13 Table of Contents National Instruments Corporation ix Lab PC 1200 AI User Manual Tables Table 2 1 PC AT I O Address Map 2 4 Table 2 2 PC AT Interrupt Assignment Map 2 6 Table 2 3 Analog I O Settings Lab PC 1200 2 7 Table 2 4 Analog Input Settings Lab PC 1200AI 2 8 Table 2 5 Analog Input Modes for the 1200 Series Boards 2 9 Table 3 1 Signal Descriptions for 1200 Series I O Connector Pins 3 4 Table 3 2 Bipolar Analog Input Signal Range Versus Gain 3 7 Table 3 3 Unipolar Analog Input Signal Range Versus Gain 3 7 Table 3 4 Summary of Analog Input Connections
71. ity _____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 ____________________________________________ _______________________________________________________________________________ _______________________________________________________________
72. l Connections National Instruments Corporation 3 23 Lab PC 1200 AI User Manual 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 interface circuitry WRT Internal Write Signal This signal is the write signal generated from the inter face 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 Table 3 6 Port C Signal Descriptions Continued Name Type Description Chapter 3 Signal Connections Lab PC 1200 AI User Manual 3 24 National Instruments Corporation Mode 1 Input Timing The timing specifications for an input transfer in mode 1 are as follows Figure 3 10 Mode 1 Timing Specifications for Input Transfers Name Description Minimum Maximum T1 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 1 180 T6 RD 0 to INTR 0 400 T7 RD 1 to IBF 0 300 All timing values are in nanoseconds DATA RD INTR IBF STB T1 T2 T4 T7 T6 T3 T5 Chapter 3 Signal Connections National Instruments Corporation 3 25 Lab PC 1200
73. l 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 is no missing codes and that no code width exceeds 2 LSBs 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 Appendix A Speci cations National Instruments Corporation A 5 Lab PC 1200 AI User Manual 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 flicke
74. lt 240 to 25F AT DIO 32F default 260 to 27F Lab PC PC default Lab PC 1200 AI recommended in switchless mode 278 to 28F AT Parallel Printer Port 2 LPT2 279 Reserved for Plug and Play operation 280 to 29F WD EtherCard default 2A0 to 2BF Unreserved 2E2 to 2F7 Unreserved 2F8 to 2FF PC AT Serial Port 2 COM2 Chapter 2 Installation and Con guration National Instruments Corporation 2 5 Lab PC 1200 AI User Manual 300 to 30F 3Com EtherLink default 310 to 31F Unreserved 320 to 32F ICM PC XT Fixed Disk Controller 330 to 35F Unreserved 360 to 363 PC Network low address 364 to 367 Reserved 368 to 36B PC Network high address 36C to 36F Reserved 378 to 37F PC AT Parallel Printer Port 1 LPT1 380 to 38C SDLC Communications 380 to 389 Bisynchronous BSC Communications alternate 390 to 393 Cluster Adapter 0 394 to 39F Unreserved 3A0 to 3A9 BSC Communications primary 3AA to 3AF Unreserved 3B0 to 3BF Monochrome Display Parallel Printer Adapter 0 3C0 to 3CF Enhanced Graphics Adapter VGA 3D0 to 3DF Color Graphics Monitor Adapter VGA 3E0 to 3EF Unreserved 3F0 to 3F7 Diskette Controller Table 2 1 PC AT I O Address Map Continued I O Address Range Hex Device Chapter 2 Installation and Con guration Lab PC 1200 AI User Manual 2 6 National Instruments Corporation 3F8 to 3FF Serial Port 1 COM1 A79 Re
75. measurement The pulse you want to measure is applied to the counter GATE input Load the counter with the known count and program it 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 Apply an edge 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 14 PA0 22 PB0 30 PC0 13 DGND 1200 Series Switch I O Connector 5 V 5 V LED TTL Signal Port B PB lt 7 0 gt Port A PA lt 7 0 gt Port C PC lt 7 0 gt Complex switch circuitry is not shown in order to simplify the figure Chapter 3 Signal Connections National Instruments Corporation 3 33 Lab PC 1200 AI User Manual then equals the count value divided by the gate period Figure 3 19 shows the connections for a fre
76. mended warm up time 15 min Offset temperature coefficient Pregain 15 V C Postgain 100 V C Gain temperature coefficient 40 ppm C 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 Gain Settling Time Accuracy 0 024 1 LSB 1 10 s typ 14 s max 2 10 13 s typ 16 s max 20 15 s typ 19 s max 50 27 s typ 34 s max 100 60 s typ 80 s 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 Appendix A Speci cations Lab PC 1200 AI User Manual A 4 National Instruments Corporation 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 s
77. mple interval you should also externally time the scan interval Figure 3 16 shows an example of an interval scanning data acquisition operation The scan interval and the sample interval are being timed externally through OUTB1 and EXTCONV Channels 1 and 0 of the input multiplexers are being scanned once during each scan interval The first rising edge of EXTCONV must occur a minimum of 50 ns after the rising edge on OUTB1 The first rising edge of EXTCONV after the rising edge of OUTB1 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 tm 50 ns min EXTTRIG EXTCONV CONVERT VIH VIL tm tm Chapter 3 Signal Connections Lab PC 1200 AI User Manual 3 30 National Instruments Corporation Figure 3 16 Interval Scanning Signal Timing Lab PC 1200 Only the Lab PC 1200 uses the EXTUPDATE signal It externally controls updating the output voltage of the 12 bit DACs and or generates 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 you select t
78. mplifier applies gain common mode voltage rejection and high input impedance to the analog input signals connected to the 1200 Series board Signals are routed to the positive and negative inputs of the instrumentation amplifier through input multiplexers on the board 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 50 0 to 199 951 mV 100 0 to 99 975 mV Table 3 3 Unipolar Analog Input Signal Range Versus Gain Continued Gain Setting Input Signal Range Instrumentation Amplifier Measured Voltage Vm Vin Vin GAIN Vin Vm Vin Chapter 3 Signal Connections National Instruments Corporation 3 9 Lab PC 1200 AI User Manual output voltage is referenced to the board ground The 1200 Series 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 1200 Series board If you have a floating source you must use a ground referenced input connection at the board If you have a grounded source you must use a nonreferenced input connection at the board Types of Signal Sources When configuring the input mode of the 1200 Series and making signal connections first determine whether the signal source is floating or ground referenced These two types of signals a
79. mportant Information Warranty The Lab PC 1200 and Lab PC 1200AI are warranted against defects in materials and workmanship for a period of one year from the date of shipment as evidenced by receipts or other documentation National Instruments will at its option repair or replace equipment that proves to be defective during the warranty period This warranty includes parts and labor 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
80. mum 400 ns maximum National Instruments Corporation 4 1 Lab PC 1200 AI User Manual Theory of Operation Chapter 4 This chapter explains the operation of each functional unit of the 1200 Series boards Functional Overview The block diagrams in Figures 4 1 and 4 2 show the functional overviews of the 1200 Series boards Figure 4 1 Lab PC 1200 Block Diagram 3 8 16 8 I O Connector PC I O Channel Dither Calibration 24 12 12 8 4 4 1 MHz Timebase 10 MHz Oscillator Time Divider 2 MHz Timebase Digital Control Logic ISA PnP Chip 82C53 Counter Timer Group A 82C55A Digital Interface 82C53 Counter Timer Group B Program Gain 12 Bit A D FIFO Input Mux 12 Bit D A 12 Bit D A Address Data Control Interrupt 1 4 8 5 Address 17 Data 8 Control 4 DMA 3 Interrupt 1 DMA 3 1 1 Chapter 4 Theory of Operation Lab PC 1200 AI User Manual 4 2 National Instruments Corporation Figure 4 2 Lab PC 1200AI Block Diagram The major components of the 1200 Series boards are as follows PC I O interface circuitry Timing circuitry Analog input circuitry Digital I O circuitry Calibration circuitry The Lab PC 1200 also contains an analog output circuitry component The internal data and control buses interconnect the components The rest of the chapter
81. n Settling Time Accuracy 0 024 1 LSB 1 10 s typ 14 s max 2 10 13 s typ 16 s max 20 15 s typ 19 s max 50 27 s typ 34 s max 100 60 s typ 80 s max Table 4 2 1200 Series Maximum Recommended Data Acquisition Rates Acquisition Mode Gain Rate Single channel 1 2 5 10 20 50 100 100 kS s Multichannel 1 90 kS s 2 5 10 77 kS s 20 66 6 kS s 50 37 kS s 100 16 6 kS s Chapter 4 Theory of Operation Lab PC 1200 AI User Manual 4 12 National Instruments Corporation Analog Output Lab PC 1200 The Lab PC 1200 has two channels of 12 bit D A output Each analog output channel can provide unipolar or bipolar output The Lab PC 1200 also contains timing circuitry for waveform generation timed either externally or internally Figure 4 6 shows the analog output circuitry Figure 4 6 Lab PC 1200 Analog Output Circuitry 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 DAC0OUT and DAC1OUT pins You can program each DAC channel for a unipolar voltage output or a bipolar voltage output range A u
82. n interrupt When a DMA terminal count pulse is received The Lab PC 1200 can also generate an interrupt when a rising edge signal is detected on the DAC update signal Timing The 1200 Series boards use two 82C53 counter timer integrated circuits for internal data acquisition timing and for general purpose I O timing functions They are also used for analog output timing if you have a Address Bus Control Lines Data Bus IRQ Register Selects Read and Write Internal Data Bus Interrupt Requests Address Latches Timing Interface Data Buffers DMA REQ DMA ACK DMA TC DMA ACK and DMATC DMA Request DMA Control Interrupt Control Address Decoder PC I O Channel Chapter 4 Theory of Operation Lab PC 1200 AI User Manual 4 4 National Instruments Corporation Lab PC 1200 Figure 4 4 shows a block diagram of both groups of timing circuitry counter groups A and B Figure 4 4 1200 Series Timing Circuitry Each 82C53 contains three independent 16 bit counter timers and one 8 bit 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 2 MHz Source A D Conversion Logic 1 MHz Source OUTB0 CLKA0 GATEB0 OUTB0 CLKB1 GATEB1 OUTB2 GATEB2 CLKB2 D A Conversion Logic 82C53 Counter Timer Group A CTR RD CTR WRT Data 8 82C53 C
83. nals general purpose timing signal connections 3 31 to 3 35 timing requirements figure 3 34 general purpose timing signal connections See also data acquisition timing connections event counting 3 31 with external switch gating figure 3 32 frequency measurement 3 32 to 3 33 illustration 3 33 GATE CLK and OUT signals 3 31 to 3 35 pins 3 27 pulse generation 3 31 pulse width measurement 3 32 specifications and ratings of 82C53 I O signals 3 33 to 3 34 square wave generation 3 31 Index National Instruments Corporation I 5 Lab PC 1200 AI User Manual time lapse measurement 3 32 timing requirements for GATE CLK and OUT signals figure 3 34 ground referenced signal sources differential connections 3 12 to 3 13 purpose and use 3 9 to 3 10 single ended connections NRSE configuration 3 16 to 3 17 summary of input configurations table 3 11 H hardware configuration See configuration hardware installation 2 1 to 2 2 I IBF signal description table 3 22 mode 1 input timing figure 3 24 mode 2 bidirectional timing figure 3 26 input configurations differential connection considerations 3 12 floating signal sources differential connections 3 13 to 3 14 summary of input configurations table 3 11 ground referenced signal sources differential connections 3 12 to 3 13 summary of input configurations table 3 11 installation See also configuration
84. ngle ended RSE reset condition Nonreferenced single ended NRSE Differential DIFF Table 2 4 Analog Input Settings Lab PC 1200AI Parameter Configuration Analog Input Polarity Bipolar 5 V reset condition Unipolar 0 to 10 V Analog Input Mode Referenced single ended RSE reset condition Nonreferenced single ended NRSE Differential DIFF Table 2 3 Analog I O Settings Lab PC 1200 Continued Parameter Configuration Chapter 2 Installation and Con guration National Instruments Corporation 2 9 Lab PC 1200 AI User Manual of 5 to 5 V at the analog output If you select a bipolar range data values written to the analog output channel range from 2 048 to 2 047 F800 hex to 7FF hex If you select a unipolar range for a DAC the data values written to the analog output channel range from 0 to 4 095 0 to FFF hex Analog Input Polarity You can select the analog input on the 1200 Series board for either a unipolar range 0 to 10 V or a bipolar range 5 to 5 V If you select a bipolar range 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 0 V input corresponds to 0 hex and 10 V corresponds to FFF hex 4 095 decimal Analog Input Mode The 1200 Series boards have three different input modes RSE input NRSE input and DIFF input The single ended input configurations use eigh
85. nipolar 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 DAC0 DAC1 DAC0OUT AGND DAC1OUT EXTUPDATE 10 V Internal Reference DAC0WRT Data DAC1WRT Counter A2 External Update 8 I O Connector Two s Complement Two s Complement PC I O Channel Digital Control Logic ISA PnP Chip Address Data Control Interrupt 1 4 8 5 Address 17 Data 8 Control 4 Interrupt 1 Chapter 4 Theory of Operation National Instruments Corporation 4 13 Lab PC 1200 AI User Manual voltage increment corresponding to an LSB change in the digital code word For both outputs DAC Timing You can update the DAC voltages in two modes 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 Digital I O The digital I O circuitry for the 1200 Series has an 82C55A integrated circuit The 82C55A is a general purpose pro
86. o 2 7 PC AT I O address map table 2 4 to 2 6 Plug and Play mode 2 2 to 2 3 switchless mode 2 3 controlled acquisition mode 4 8 to 4 9 Counter 0 on 82C53 A counter timer 3 27 Counter 1 on 82C53 A counter timer 3 27 Index National Instruments Corporation I 3 Lab PC 1200 AI User Manual custom cabling 1 5 to 1 6 customer communication xiii B 1 to B 2 D DAC timing 4 13 DAC0OUT signal table 3 3 DAC1OUT signal table 3 4 DACWRT signal 3 30 DAQ and general purpose timing signal connections data acquisition timing connections 3 27 to 3 31 general purpose timing connections 3 31 to 3 35 pins 3 27 power connections 3 35 data acquisition operations 4 8 to 4 10 controlled acquisition mode 4 8 to 4 9 freerun acquisition mode 4 9 interval scanning acquisition mode 4 9 multichannel scanned data acquisition 4 10 single channel data acquisition 4 9 to 4 10 data acquisition rates analog input settling time versus gain table 4 11 maximum recommended rates table 4 11 theory of operation 4 10 to 4 11 A 5 data acquisition timing connections See also general purpose timing signal connections EXTCONV signal 3 27 to 3 29 EXTCONV signal timing figure 3 27 EXTTRIG signal 3 27 to 3 29 EXTUPDATE signal 3 30 to 3 31 interval scanning 3 29 to 3 30 Lab PC 1200 3 30 signal timing figure 3 30 pins 3 27 posttrigger and pretrigger modes 3 27 to 3 29 posttrigger timing
87. ol signal to trigger a data acquisition operation 39 EXTUPDATE NC DI DGND External Update Lab PC 1200 only External control signal to update DAC outputs No Connect Lab PC 1200AI only This pin is not connected 40 EXTCONV DIO DGND External Convert External control signal to time A D conversions DI and drive SCANCLK when you use SCXI DO 41 OUTB0 DO DGND Output B0 Digital output signal of counter B0 42 GATB0 DI DGND Gate B0 External control signal for gating counter B0 43 OUTB1 DIO DGND Output B1 Digital output signal of counter B1 DO External control signal for timing a scan interval DI Table 3 1 Signal Descriptions for 1200 Series I O Connector Pins Continued Pin Signal Name Direction Reference Description Chapter 3 Signal Connections Lab PC 1200 AI User Manual 3 6 National Instruments Corporation 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 Analog Input Signal Connections Pins 1 through 8 are analog input signal pins for your 1200 Series board 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 1200 Series board in RSE mode or as a return path in NRSE mode P
88. on Lab PC 1200 185 mA at 5 VDC 5 Lab PC 1200AI 150 mA at 5 VDC 5 Power available at I O connector 4 65 to 5 25 V fused at 1 A Physical Dimensions 17 45 by 10 56 cm 6 87 by 4 16 in I O connector 50 pin male Environment Operating temperature 0 to 50 C Storage temperature 55 to 150 C Relative humidity 5 to 90 noncondensing National Instruments Corporation B 1 Lab PC 1200 AI User Manual Customer Communication Appendix B 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 FaxBack system and e mail support If you have a hardware or software problem first try the electronic support systems If the information available on th
89. ons engineering team through e mail at the Internet addresses listed below Remember to include your name address and phone number so we can contact you with solutions and suggestions GPIB gpib support natinst com LabVIEW lv support natinst com DAQ daq support natinst com HiQ hiq support natinst com VXI vxi support natinst com VISA visa support natinst com LabWindows lw support natinst com Fax and Telephone 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 Telephone Fax Australia 03 9 879 9422 03 9 879 9179 Austria 0662 45 79 90 0 0662 45 79 90 19 Belgium 02 757 00 20 02 757 03 11 Canada Ontario 519 622 9310 Canada Quebec 514 694 8521 514 694 4399 Denmark 45 76 26 00 45 76 26 02 Finland 90 527 2321 90 502 2930 France 1 48 14 24 24 1 48 14 24 14 Germany 089 741 31 30 089 714 60 35 Hong Kong 2645 3186 2686 8505 Italy 02 413091 02 41309215 Japan 03 5472 2970 03 5472 2977 Korea 02 596 7456 02 596 7455 Mexico 95 800 010 0793 5 520 3282 Netherlands 0348 433466 0348 430673 Norway 32 84 84 00 32 84 86 00 Singapore 2265886 2265887 Spain 91 640 0085 91 640 0533 Sweden 08 730 49 70 08 730 43 70 Switzerland 056 200 51 51
90. or SCXI through NI DAQ or LabVIEW Figure 3 13 EXTCONV Signal Timing The external control signal EXTTRIG can either start a data acquisition sequence or terminate an ongoing data acquisition sequence depending on the mode posttrigger POSTTRIG or pretrigger PRETRIG These modes are software selectable A D Conversion starts within 125 ns from this point tm 250 ns min tm tm EXTCONV VIH VIL Chapter 3 Signal Connections Lab PC 1200 AI User Manual 3 28 National Instruments Corporation In the POSTTRIG mode EXTTRIG serves as an external trigger that initiates a data acquisition sequence When you use counter A0 to time sample intervals a rising edge on EXTTRIG starts counter A0 and the data acquisition sequence When you use EXTCONV to time sample intervals the data acquisition starts on a rising edge of EXTTRIG followed by a rising edge on EXTCONV The first conversion occurs on the next falling edge of EXTCONV Further transitions on the EXTTRIG line have no effect until a new data acquisition sequence is established Figure 3 14 shows a possible controlled data acquisition 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 Figure 3 14 Posttrigger Data Acquisition Timing In the PRETRIG mode EXTTRIG serves as a pretrigger signal
91. ounter Timer Group B OUTB0 OUTB2 GATEB2 CLKB2 GATEB1 Scan Interval General Purpose Counter CLKB1 OUTB1 GATEB0 Timebase Extension General Purpose Counter CLKB0 5 V MUX MUX EXTUPDATE EXTTRIG EXTCONV I O Connector CLKA2 OUTA0 Sample Interval Counter CLKA0 GATEA0 CLKA1 Sample Counter GATEA1 OUTA1 GATEA2 DAC Timing OUTA2 General Purpose Counter OUTB1 OUTB1 Digital Control Logic Lab PC 1200 Only Chapter 4 Theory of Operation National Instruments Corporation 4 5 Lab PC 1200 AI User Manual The first group of counter timers is group A and includes A0 A1 and A2 For internal data acquisition timing on both boards you can use counters A0 and A1 If you have a Lab PC 1200 you can also use counter A2 for analog output timing Or instead of using these three counters you can use the three external timing signals EXTCONV EXTTRIG and EXTUPDATE for data acquisition and DAC timing For external data acquisition timing on both boards you can use the EXTCONV and EXTRIG signals If you have a Lab PC 1200 you can also use the EXTUPDATE signal for analog output timing The second group of counter timers is group B and includes B0 B1 and B2 You can use counters B0 and B1 for internal data acquisition timing or you can use the external timing signal CLKB1 for analog input timing If you have a Lab PC 1200 you can also use counter
92. our Hardware Register Level Programming The final option for programming any National Instruments 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 or LabWindows CVI to program your National Instruments DAQ hardware Using the NI DAQ LabVIEW or LabWindows CVI software is easier than and as flexible as register level programming and can save weeks of development time LabWindows CVI PC or Sun SPARCstation LabVIEW PC Macintosh or Sun SPARCstation Conventional Programming Environment PC Macintosh or Sun SPARCstation NI DAQ Driver Software DAQ or SCXI Hardware Personal Computer or Workstation Chapter 1 Introduction National Instruments Corporation 1 5 Lab PC 1200 AI User Manual Optional Equipment National Instruments offers a variety of products to use with your Lab PC 1200 AI board including cables connector blocks and other accessories as follows Cables and cable assemblies Connector blocks 50 pin screw terminals 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 Low channel count signal conditioning modules boa
93. p losses Vg are added to measured signal V1 ACH AISENSE R AIGND V1 ACH AISENSE AIGND AIGND Chapter 3 Signal Connections Lab PC 1200 AI User Manual 3 12 National Instruments Corporation Differential Connection Considerations DIFF Configuration Differential connections are those in which each 1200 Series analog input signal has its own reference signal or signal return path These connections are available when you configure the 1200 Series board 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 1200 Series 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 your DAQ system has any of the following conditions Input signals are low level less than 1 V Leads connecting the signals to the 1200 Series board are greater than 10 ft Any of the input signals require a separate ground reference point or return signal The signal leads travel through noisy environments Differential signal connections reduce picked up noise and increase common mode signal and noise rejection With thes
94. period plus the sample and hold acquisition time During multichannel scanning the data acquisition rates are further limited by the input multiplexer and programmable gain amplifier settling times After switching the input multiplexers you must allow the amplifier to settle to the new input signal value to within 12 bit accuracy before you perform an A D conversion or you will not get 12 bit accuracy 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 data acquisition 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 s For multichannel data acquisition observing the data acquisition rates in Table 4 2 ensures 12 bit Chapter 4 Theory of Operation National Instruments Corporation 4 11 Lab PC 1200 AI User Manual resolution The hardware is capable of multiscanning at higher rates than those listed in Table 4 2 but 12 bit resolution is not guaranteed The recommended data acquisition 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 Table 4 1 Analog Input Recommended Settling Time Versus Gain Gai
95. poration Note If you power both the 1200 Series board and your computer with a floating power source such as a battery your system may be floating with respect to earth ground In this case treat all of your signal sources as floating sources Input Configurations You can configure the 1200 Series 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 and ground referenced signal sources Table 3 4 summarizes the recommended input configurations for both types of signal sources Chapter 3 Signal Connections National Instruments Corporation 3 11 Lab PC 1200 AI User Manual Table 3 4 Summary of Analog Input Connections Input Differential DIFF Referenced Single Ended Ground RSE Nonreferenced Single Ended NRSE Floating Signal Source Not Connected to Earth Ground Grounded Signal Source Examples Ungrounded thermocouples Signal conditioning with isolated outputs Battery devices Examples Plug in instruments with nonisolated outputs V1 ACH V1 ACH ACH See text for information on bias resistors See text for information on bias resistors R Signal Source Type ACH AIGND V1 ACH AIGND NOT RECOMMENDED ACH Vg V1 Ground loo
96. quency measurement application You can also use a second counter to generate the gate signal in this application If you use a second counter however you must externally invert the signal Figure 3 19 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 k resistor Refer to Appendix A Specifications for signal voltage and current specifications The following specifications and ratings apply to the 82C53 I O signals Absolute maximum voltage input rating 0 5 to 5 5 V with respect to DGND 82C53 digital input specifications referenced to DGND VIH input logic high voltage 2 2 V min 5 3 V max VIL input logic low voltage 0 3 V min 0 8 V max Input load current 10 A min 10 A max Signal Source 13 DGND Counter OUT CLK GATE 5 V 100 k I O Connector 1200 Series Gate Source Chapter 3 Signal Connections Lab PC 1200 AI User Manual 3 34 National Instruments Corporation 82C53 digital output specifications referenced to DGND VOH output logic high voltage 3 7 V min VOL output logic low voltage 0 45 V max IOH output source current at VOH 0 92 mA max IOL output sink current at VOL 2 1 mA max Figure 3 20 shows the timing requirements for the GATE and CLK
97. r 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 1200 Series boards 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 addition is useful for applications involving averaging to increase the resolution of the 1200 Series 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 effect
98. rds and accessories including conditioning for strain gauges and RTDs simultaneous sample and hold and relays For specific information about these products refer to your National Instruments catalogue or call the office nearest you Custom Cabling National 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 For the analog input signals shielded twisted pair wires for each analog input pair yield the best results if you use differential inputs Tie the shield for each signal pair to the ground reference at the source Route the analog lines separately from the digital lines 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 Chapter 1 Introduction Lab PC 1200 AI User Manual 1 6 National Instruments Corporation The mating connector for the Lab PC 1200 AI 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 Lab PC 1200 AI Recommended manufacturer part numbers for this mating connector are as follows Electronic Products Division 3M part number 3425
99. re described in the following sections Floating Signal Sources A floating signal source does not connect in any way to earth ground but has an isolated ground reference point Some examples of floating signal sources are transformer outputs thermocouples battery powered devices optical isolator outputs and isolation amplifiers Tie the ground reference of a floating signal to the 1200 Series board 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 connects in some way to earth ground and is therefore already connected to a common ground point with respect to the 1200 Series board if the computer is plugged into the same power supply Nonisolated outputs of instruments and devices that plug into the power supply fall into this category The difference in ground potential between two instruments connected to the same power supply is typically between 1 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 Chapter 3 Signal Connections Lab PC 1200 AI User Manual 3 10 National Instruments Cor
100. re in the Analog I O Configuration section of Chapter 2 Installation and Configuration Chapter 3 Signal Connections Lab PC 1200 AI User Manual 3 16 National Instruments Corporation Figure 3 6 Single Ended Input Connections for Floating Signal Sources Single Ended Connections for Grounded Signal Sources NRSE Configuration If you measure a grounded signal source with a single ended configuration configure the 1200 Series in the NRSE input configuration The signal connects to the positive input of the 1200 Series instrumentation amplifier and the signal local ground reference connects to the negative input of the 1200 Series instrumentation amplifier Therefore connect the ground point of the signal to the AISENSE pin Any potential difference between the 1200 Series 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 1200 Series is referenced to ground such as in the RSE configuration this difference in ground potentials appears as an error in the measured voltage Figure 3 7 shows how to connect a grounded signal source to a 1200 Series board configured in the NRSE configuration Vs Vm Measured Voltage Floating Signal Source ACH0 AISENSE AIGND AGND I O Connector 1 2
101. rogramming 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 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 minimal modifications to your code Whether you are using conventional programming languages LabVIEW or LabWindows CVI your application uses the NI DAQ driver software as illustrated in Figure 1 1 Chapter 1 Introduction Lab PC 1200 AI User Manual 1 4 National Instruments Corporation Figure 1 1 The Relationship between the Programming Environment NI DAQ and Y
102. s 3 18 Digital I O Signal Connections 3 19 Logical Input and Output 3 20 Port C Pin Connections 3 21 Timing Specifications 3 22 Mode 1 Input Timing 3 24 Mode 1 Output Timing 3 25 Mode 2 Bidirectional Timing 3 26 Data Acquisition and General Purpose Timing Signal Connections 3 27 Data Acquisition Timing Connections 3 27 General Purpose Timing Signal Connections 3 31 Power Connections 3 35 Table of Contents National Instruments Corporation vii Lab PC 1200 AI User Manual Chapter 4 Theory of Operation Functional Overview 4 1 PC I O Channel Interface Circuitry 4 2 Timing
103. s 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 Data Acquisition Rates Maximum data acquisition rates number of samples per second are determined by the conversion period of the ADC plus the sample and hold acquisition time which is specified at 10 s During multichannel scanning the data acquisition rates are further limited by the settling time of the input multiplexers and programmable gain amplifier After the input multiplexers are switched the amplifier must Appendix A Speci cations Lab PC 1200 AI User Manual A 6 National Instruments Corporation 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 Analog Output Lab PC 1200 Only Output Characteristics Number of channels Two voltage Resolution 12 bits 1 in 4 096 Typical update rate 1 kS s system dependent Type of DAC Double buffered Data transfers Interrupts programmed I O Transfer Characteristics Relative accuracy INL 0 25 LSB typ 0 50 LSB max DNL 0 25 LSB t
104. served for Plug and Play operation Table 2 2 PC AT Interrupt Assignment Map IRQ Device 15 Available 14 Fixed Disk Controller 13 Coprocessor 12 AT DIO 32F default 11 AT DIO 32F default 10 AT MIO 16 default 9 PC Network default PC Network Alternate default 8 Real Time Clock 7 Parallel Port 1 LPT1 6 Diskette Drive Controller Fixed Disk and Diskette Drive Controller 5 Parallel Port 2 LPT2 PC DIO 24 default Lab PC PC default Lab PC 1200 AI recommended in switchless mode 4 Serial Port 1 COM1 BSC BSC Alternate Table 2 1 PC AT I O Address Map Continued I O Address Range Hex Device Chapter 2 Installation and Con guration National Instruments Corporation 2 7 Lab PC 1200 AI User Manual Data Acquisition Related Configuration Analog I O Configuration Lab PC 1200 Upon power up or after a software reset the Lab PC 1200 is set to the following configuration Referenced single ended input mode 5 V analog input range bipolar 5 V analog output range bipolar Table 2 3 lists all of the available analog I O configurations for the Lab PC 1200 and shows the configuration in reset condition 3 Serial Port 2 COM2 BSC BSC Alternate Cluster primary PC Network PC Network Alternate WD EtherCard default 3Com EtherLink default 2 IRQ 8 15 Chain from interrupt controller 2 1 Ke
105. sory 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 manuals If you are using SCXI read these manuals for maintenance information on the chassis and installation instructions About This Manual Lab PC 1200 AI User Manual xiv National Instruments Corporation Related Documentation The following National Instruments document contains information that you may find helpful as you read this manual Application Note 025 Field Wiring and Noise Considerations for Analog Signals The following documents also contain information that you may find helpful Dither in Digital Audio by John Vanderkooy and Stanley P Lipshitz Journal of the Audio Engineering Society Vol 35 No 12 December 1987 Your computer s technical reference manual The following National Instruments manual contains detailed information for the register level programmer Lab PC 1200 AI Register Level Programmer Manual This manual is available from National Instruments by request If you are using NI DAQ or LabVIEW you should not need the register level programmer manual Using NI DAQ LabVIEW or LabWindows CVI is easier than and as flexible as
106. ssociated with a bit signal or port for example ACH lt 0 7 gt stands for ACH0 through ACH7 1200 Series 1200 Series refers to both the Lab PC 1200 and Lab PC 1200AI boards unless otherwise noted bold Bold text denotes menus menu items or dialog box buttons or options bold italic Bold italic text denotes a note caution or warning italic Italic text denotes emphasis a cross reference or an introduction to a key concept monospace Text in this font denotes text or characters that are to be literally input 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 variables filenames and extensions and for statements and comments taken from program code NI DAQ NI DAQ refers to the NI DAQ software for PC compatibles unless otherwise noted SCXI 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 Abbreviations acronyms metric prefixes mnemonics symbols and terms are listed in the Glossary About This Manual National Instruments Corporation xiii Lab PC 1200 AI User Manual National Instruments Documentation The Lab PC 1200 AI User Manual is one piece of
107. suring floating signal sources With this input configuration your 1200 Series board can monitor eight different analog input channels Considerations for using the RSE configuration 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 board 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 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 1200 Series board 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
108. t channels The DIFF input configuration uses four channels Table 2 5 describes these configurations Table 2 5 Analog Input Modes for the 1200 Series Boards 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 Chapter 2 Installation and Con guration Lab PC 1200 AI User Manual 2 10 National Instruments Corporation 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 1200 Series board analog input ground The differential amplifier negative input is tied to analog ground The RSE configuration is useful for mea
109. ter 2 Installation and Con guration National Instruments Corporation 2 3 Lab PC 1200 AI User Manual The Configuration Manager receives all of the resource requests at startup compares the available resources to those requested and assigns the available resources as efficiently as possible to the Plug and Play boards Application software can query the Configuration Manager to determine the resources assigned to each board without your involvement The Plug and Play software is installed as a device driver or as an integral component of the computer BIOS If you have the Windows 95 operating system on your computer it will configure your 1200 Series board Refer to your NI DAQ documentation for more information Switchless Mode You can use your 1200 Series board in a non Plug and Play system as a switchless DAQ board A non Plug and Play system is a system in which the Configuration Manager has not been installed and which does not contain any non National Instruments Plug and Play products You use a configuration utility to enter the base address DMA channel and interrupt channel selections and the application software assigns it to the board Note To avoid resource conflicts with non National Instruments boards do not configure two boards for the same base address Base I O Address Selection You can configure your 1200 Series board to use base addresses in the range of 100 to 3E0 hex The 1200 Series boards oc
110. terminal and through channel 1 3 5 or 7 depending on which channel pair you select National Instruments Corporation 3 1 Lab PC 1200 AI User Manual Signal Connections Chapter 3 This chapter describes how to make input and output signal connections to the 1200 Series boards via the board I O connector and details the I O timing specifications The I O connector for the 1200 Series boards has 50 pins that you can connect to 50 pin accessories I O Connector Figures 3 1 and 3 2 show the pin assignments for the 1200 Series board I O connectors Warning Connections that exceed any of the maximum ratings of input or output signals on the 1200 Series boards can damage your board and the computer This includes connecting any power signals to ground and vice versa National Instruments is NOT liable for any damages resulting from signal connections that exceed these maximum ratings Chapter 3 Signal Connections Lab PC 1200 AI User Manual 3 2 National Instruments Corporation Figure 3 1 Lab PC 1200 I O Connector Pin Assignments 5 V GATB2 CLKB1 OUTB1 OUTB0 EXTUPDATE PC7 PC5 PC3 PC1 PB7 PB5 PB3 PB1 PA7 PA5 PA3 PA1 DGND AGND AISENSE AIGND ACH6 ACH4 ACH2 ACH0 DGND OUTB2 GATB1 EXTCONV EXTTRIG PC6 PC4 CLKB2 GATB0 PC2 PC0 PB6 PB4 PB2 PB0 PA6 PA4 PA2 PA0 DAC1OUT DAC0OUT ACH7 ACH5 ACH3 ACH1 49 50 47 4
111. ting system and LabVIEW If you are using LabWindows CVI refer to your LabWindows CVI release notes to install your application software After you have installed LabWindows CVI refer to the NI DAQ release notes and follow the instructions given there for your operating system and LabWindows CVI Hardware Installation Note You should install your driver software before installing your hardware Refer to your NI DAQ release notes for software installation instructions You can install your 1200 Series board in any unused expansion slot in your computer The following are general installation instructions Consult your computer user manual or technical reference manual for specific instructions and warnings 1 Write down your board s serial number in the hardware and software configuration form in Appendix B Customer Communication You will need this information when you install and configure your board Chapter 2 Installation and Con guration Lab PC 1200 AI User Manual 2 2 National Instruments Corporation 2 Turn off your computer 3 Remove the top cover or access port to the I O channel 4 Remove the expansion slot cover on the back panel of the computer 5 Insert the board into an unused 8 bit or 16 bit ISA slot The fit may be tight but do not force the board into place 6 Screw the board s mounting bracket to the back panel rail of the computer to secure the 1200 Ser
112. tion concerning the various 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 the 1200 Series board 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 B0 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 18 shows connections for a typical event counting operation in which a switch gates the counter on and off tm 50 ns min EXTUPDATE DAC OUTPUT UPDATE CNTINT DACWRT tm Chapter 3 Signal Connections Lab PC 1200 AI User Manual 3 32 National Instruments Corporation Figure 3 18 Event Counting Application with External Switch Gating Level gating performs pulse width
113. tor 3 1 I O Connector Signal Descriptions 3 4 Analog Input Signal Connections 3 6 Types of Signal Sources 3 9 Floating Signal Sources 3 9 Ground Referenced Signal Sources 3 9 Input Configurations 3 10 Differential Connection Considerations DIFF Configuration 3 12 Differential Connections for Ground Referenced Signal Sources 3 12 Differential Connections for Nonreferenced or Floating Signal Sources 3 13 Single Ended Connection Considerations 3 15 Single Ended Connections for Floating Signal Sources RSE Configuration 3 15 Single Ended Connections for Grounded Signal Sources NRSE Configuration 3 16 Common Mode Signal Rejection Considerations 3 17 Analog Output Signal Connection
114. tor logic typ typical U UP BP unipolar bipolar bit V V volts V in positive negative input voltage V cm common mode noise VDC volts direct current V diff differential input voltage Glossary Lab PC 1200 AI User Manual G 8 National Instruments Corporation V g ground loop losses VGA video graphics array VI virtual instrument V IH volts input high V IL volts input low V m measured voltage VOUT0 VOUT1 DAC output voltages V s signal source W WRT write signal National Instruments Corporation I 1 Lab PC 1200 AI User Manual Index Numbers 5 V signal table 3 6 A ACH lt 0 7 gt signal analog input signal range vs gain table bipolar 3 7 unipolar 3 7 to 3 8 definition table 3 4 exceeding input range 3 7 ACK signal description table 3 22 mode 1 output timing figure 3 25 mode 2 bidirectional timing figure 3 26 A D FIFO 4 7 ADC Analog to Digital Converter 4 7 to 4 8 AGND signal table 3 4 AISENSE AIGND signal definition table 3 4 using for general analog power ground tie 3 6 analog input circuitry block diagram 4 6 theory of operation 4 6 to 4 8 analog input modes See analog I O configuration analog input settling time versus gain table 4 11 analog input signal connections common mode signal rejection 3 17 to 3 18 differential
115. traight line is the ideal transfer function and the relative accuracy specification indicates the worst deviation from the ideal that the ADC permits A relative 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 Although 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 wel
116. ts 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 Copyright Under the copyright 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 Trademarks LabVIEW NI DAQ and SCXI are trademarks 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 us
117. unication xiv Chapter 1 Introduction About the Lab PC 1200 AI 1 1 What You Need to Get Started 1 1 Software Programming Choices 1 2 LabVIEW and LabWindows CVI Application Software 1 2 NI DAQ Driver Software 1 3 Register Level Programming 1 4 Optional Equipment 1 5 Custom Cabling 1 5 Unpacking 1 6 Chapter 2 Installation and Configuration Software Installation 2 1 Hardware Installation 2 1 Hardware Configurat
118. yboard Controller Output Buffer Full 0 Timer Channel 0 Output Table 2 3 Analog I O Settings Lab PC 1200 Parameter Configuration Analog Output CH0 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 Table 2 2 PC AT Interrupt Assignment Map Continued IRQ Device Chapter 2 Installation and Con guration Lab PC 1200 AI User Manual 2 8 National Instruments Corporation Both the analog input and analog output circuitry is software configurable Lab PC 1200AI Upon power up or after a software reset the Lab PC 1200AI is set to the following configuration Referenced single ended input mode 5 V analog input range bipolar Table 2 4 lists the available analog input configurations for the Lab PC 1200AI and shows the configuration in reset condition The analog input circuitry is completely software configurable Analog Output Polarity Lab PC 1200 The Lab PC 1200 has two analog output channels at the I 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 Analog Input Polarity Bipolar 5 V reset condition Unipolar 0 to 10 V Analog Input Mode Referenced si
119. yp 0 75 LSB max Monotonicity 12 bits guaranteed Offset error After calibration 0 2 mV max Before calibration 50 mV max Gain error relative to internal reference After calibration 0 004 of reading max Before calibration 1 of reading max Voltage Output Ranges 0 to 10 V 5 V software selectable Output coupling DC Output impedance 0 2 typ Current drive 2 mA Protection Short circuit to ground Power on state 0 V Dynamic Characteristics Settling time to full scale range FSR 5 s Appendix A Speci cations National Instruments Corporation A 7 Lab PC 1200 AI User Manual Stability Offset temperature coefficient 50 V C Gain temperature coefficient 30 ppm C Explanation of Analog Output Specifications Lab PC 1200 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

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