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DAQCard-1200 User Manual

1. mode 1 T3 lt _ gt WRT T4 4 gt OBF T1 pPJ3 T6 A INTR T5 A ACK DATA T2 Name Description Minimum Maximum T1 WRT 0 to INTR 0 250 T2 WRT 1 to output 200 T3 WRT 1 to OBF 20 150 T4 ACK 0 to OBF 1 150 T5 ACK pulse width 100 T6 ACK 1 to INTR 1 150 All timing values are in nanoseconds Figure 3 10 Mode 1 Timing Specifications for Output Transfers Mode 2 Bidirectional Timing Figure 3 11 shows the timing specifications for bidirectional transfers in mode 2 DAQCard 1200 User Manual 3 20 ni com Chapter 3 Connecting the Signals T1 WRT T6 lt _ _ gt OBF INTR T R ACK T3 STB T10 lt gt lt gt T4 IBF Y RD T2 T5 T8 T9 lt _ _ gt lt gt lt _ _ gt e DATA E Name Description Minimum Maximum T1 WRT 1 to OBF 0 150 T2 Data before STB 1 20 T3 STB pulse width 100 T4 STB 0 to IBF 1 150 T5 Data after STB 1 50 T6 ACK 0 to OBF 1 150 T7 ACK pulse width 100 T8 ACK 0 to output 150 T9 ACK 1 to output float 20 250 T10 RD 1 to IBF 0 150 All timing values are in nanoseconds Figure 3 11
2. Floating Signal Source i So So 9 AISENSE AIGND Measured Front I O Connector m Voltage 11 AGND O DAQCard 1200 in RSE Configuration DAQCard 1200 User Manual Figure 3 5 Single Ended Input Connections for Floating Signal Sources Single Ended Connections for Grounded Signal Sources NRSE Input Mode If you measure a grounded signal source with a single ended configuration you must configure the DAQCard 1200 in the NRSE input configuration The signal is connected to the positive input of the DAQCard 1200 instrumentation amplifier and the signal local ground reference is connected to the negative input of the DAQCard 1200 instrumentation amplifier Therefore you must connect the ground point of the signal to the AISENSE AIGND pin Any potential difference between the DAQCard 1200 ground and the signal ground appears as a common mode signal at both the positive and negative inputs of the instrumentation amplifier and is therefore rejected by the amplifier NRSE input mode must be used in place of the RSE input mode to prevent any difference in ground potentials from appearing as an error in the measured voltage Figure 3 6 shows how to connect a grounded signal source to a DAQCard 1200 configured in the NRSE configuration For configuration instructions refer to the Configuring Analog Input section of Chapter 2 Installing and Configuring the
3. Specifications This appendix lists the specifications for the DAQCard 1200 These specifications are typical at 25 C unless otherwise noted Analog Input Input Characteristics Number of channels sse 8 single ended 8 pseudodifferential or 4 differential software selectable Resolution sssessoeesesereessssssssessrcossssssssee 12 bits 1 in 4 096 Max single channel sampling rate 100 kS s Input signal ranges Device Gain Device Range Software Selec Software Selectable table Unipolar Bipolar 1 Oto 10 V 5 V 2 0to5V 2 5 V 5 0to2 V 1V 10 Otol V 500 mV 20 0 to 500 mV 250 mV 50 0 to 250 mV 100 mV 100 0 to 100 mV 50 mV Input coupling eee DC Type ot ADCO iem Successive approximation National Instruments Corporation A 1 DAQCard 1200 User Manual Appendix A Specifications DAQCard 1200 User Manual Maximum working voltage signal common mode Negative input AISENSE should remain within 6 V bipolar or 6 to 2 V unipolar of AGND Overvoltage protection x35 V powered on and 25 V powered off Inputs protected sss ACH lt 0 7 gt FIFO buffer size eese 1 024 samples Data transfers ee neegaanet s Interrupts programmed I O Dither eene ett Available Transfer Characteristics Relative accuracy
4. ni com D DAC OUTPUT UPDATE signal 3 27 DACOOUT signal table 3 3 DACIOUT signal table 3 3 DACWRT signal 3 27 DAQ and general purpose timing signal connections DAQ timing connections 3 22 general purpose timing connections 3 26 3 27 pins 3 22 power connections 3 31 DAQ timing connections See data acquisition timing connections DAQCard 1200 block diagram 4 1 configuration See configuration differences among Lab PC DAQPad 1200 and DAQCard 1200 B 1 installation 2 1 optional equipment 1 4 overview and features 1 1 requirements for getting started 1 2 software programming choices National Instruments ADE software 1 4 NI DAQ driver software 1 2 theory of operation See theory of operation unpacking 1 5 DAQPad 1200 compared with Lab PC and DAQCard 1200 B 1 data acquisition rates maximum recommended rates table 4 9 settling time versus gain table 4 9 data acquisition timing circuitry continuous data acquisition 4 8 data acquisition operation 4 8 interval data acquisition 4 8 National Instruments Corporation F3 Index data acquisition timing connections See also general purpose timing signal connections EXTCONV signal 3 23 EXTTRIG signal 3 23 EXTUPDATE signal 3 26 multiple channel interval scanning figure 3 26 pins 3 22 posttrigger and prettrigger modes 3 23 sample counter 3 22 sample interval counter 3 22 waveform generation timing sequence 3 27 DATA signal tab
5. seen 0 5 LSB typ dithered 1 5 LSB max undithered DNE erede 1 LSB max No missing codes eses 12 bits guaranteed Offset error Pre gain error after calibration 10 uV max Pre gain error before calibration Post gain error after calibration Post gain error before calibration After calibration Before calibration Gain 1 with gain error adjusted to 0 at gain 1 Amplifier Characteristics Input impedance Normal powered on Powered off etd Qverload eu eee A 2 20 mV max 1 mV max 200 mV max Gain error relative to calibration reference 0 02 of reading max 2 of reading max 0 8 of reading max 100 GQ in parallel with 50 pF 4 7 k min 4 7 k min ni com Appendix A Specifications Input bias current seessss 100 pA Input offset current esses 100 pA CMRR unit cher tee 70 dB DC to 60 Hz Dynamic Characteristics Bandwidth Small signal 3 dB Gain Bandwidth 1 10 250 kHz 20 150 kHz 50 60 kHz 100 30 kHz Settling time to full scale step Accuracy Gain 0 024 1 LSB 1 10 10 us max 20 12 us typ 15 us max 50 25 us typ 30 us max 100 60 us typ 80 us max System noise not including quantization error Gain Dither Off Dither On 1 50 0 3 LS
6. Circuit Breaker Plug in Equipment Electric Meter Source of Building Fixed Local Level Secondary Low Voltage Installation Distribution Such Windings of lt 1000 V Distribution as Wall Sockets Isolation Installation Panel Transformers National Instruments Corporation DAQCard 1200 User Manual Installing and Configuring the DAQCard 1200 This chapter describes how to install and configure the DAQCard 1200 Installing the Software Install the software before you install the DAQCard 1200 Install the ADE such as LabVIEW or Measurement Studio according to the instructions on the CD and the release notes After you have installed the ADE install NI DAQ according to the instructions on the CD and the DAQ Quick Start Guide included with the DAQCard 1200 3 Note Itis important to install NI DAQ before installing the DAQCard 1200 to ensure that the DAQCard 1200 is properly detected Installing the Hardware The following are general installation instructions Consult the computer user manual or technical reference manual for specific instructions and warnings about installing new devices Refer to Figure 2 1 when installing the DAQCard 1200 1 Power off and unplug the computer ay Note You must have Card amp Socket Services 2 0 or later on the computer 2 Insert the PCMCIA bus connector of the DAQCard 1200 in any available Type II PC Card slot until the connector is firmly seated The DAQCar
7. ESP EXTCONV EXTINT EXTTRIG EXTUPDATE FIFO DAQCard 1200 User Manual digital output digital output signal electrically erasable programmable read only memory ROM that can be erased with an electrical signal and reprogrammed Extended Industry Standard Architecture Engineering Software Package external control signal to trigger A D conversions external interrupt signal External Trigger external control singal to trigger a DAQ operation External Update external control singal to update DAC outputs farads first in first out memory buffer the first data stored is the first data sent to the acceptor FIFOs are often used on DAQ devices to temporarily store incoming or outgoing data until that data can be retrieved or output For example an analog input FIFO stores the results of A D conversions until the data can be retrieved into system memory a process that requires the servicing of interrupts and often the programming of the DMA controller This process can take several milliseconds in some cases During this time data accumulates in the FIFO for future retrieval With a larger FIFO longer latencies can be tolerated In the case of analog output a FIFO permits faster update rates because the waveform data can be stored on the FIFO ahead of time This again reduces the effect of latencies associated with getting the data from system memory to the DAQ device G 4 ni com gain GATE glitch I O IBF
8. Each AO channel contains a 12 bit DAC The DAC in each AO channel generates a voltage proportional to the 5 V reference provided in the Dual DAC chip multiplied by the 12 bit digital code loaded into the DAC The voltage output from the two DACS is available at the DAQCard 1200 I O connector DACOOUT and DACIOUT pins You can program each DAC channel for a unipolar voltage output or a bipolar voltage output range A unipolar output gives an output voltage DAQCard 1200 User Manual 4 10 ni com Chapter 4 Theory of Operation range of 0 to 10 V A bipolar output gives an output voltage range of 5 V For unipolar output 0 V output corresponds to a digital code word of 0 For bipolar output 5 V output corresponds to a digital code word of F800 hex One least significant bit LSB is the voltage increment corresponding to an LSB change in the digital code word For both outputs 10 1LSB 3096 Power On State Both analog outputs reach 0 V approximately 110 ms after card insertion During this 110 ms period the output voltage can swing from 2 to 5 V UN Caution Disconnect the analog outputs from the system before inserting the card in the PC Card slot This step ensures that you do not damage the system during the 110 ms before the output reaches 0 V DAC Timing There are two ways you can update the DAC voltages In the first mode the DAC output voltage is updated as soon as you write to the corresponding DAC This mod
9. 2 ni com Glossary Prefix Meanings Value p pico 10 2 n nano 10 9 u micro 10 6 m milli 10 3 k kilo 103 M mega 10 G giga 10 t tera 102 Numbers Symbols degrees Q ohms percent A A amperes A D analog to digital AC alternating current ACH analog input channel signal ACK Acknowledge Input A low signal on this handshaking line indicates that the data written from the specified port has been accepted primarily a response from the external device that it has received data National Instruments Corporation G 1 DAQCard 1200 User Manual Glossary ADC ADE AGND AI AIGND AISENSE AO AWG BCD bipolar bit buffer byte C C CalDAC CE CLK CMOS DAQCard 1200 User Manual analog to digital converter an electronic device often an integrated circuit that converts an analog voltage to a digital number application development environment analog output ground reference signal for analog output voltages analog input analog input ground signal analog input sense signal analog output American Wire Gauge binary coded decimal a signal range that includes both positive and negative values for example 5 V to 5 V one binary digit either O or 1 temporary storage for acquired or generated data software eight related bits Celsius calibration DAC card enable signal clock input signal complementary metallic oxide sem
10. 5 to 90 RH noncondensing Maximum altitude 2000 meters Pollution degree indoor use only 2 Safety The DAQCard 1200 meets the requirements of the following standards for safety and electrical equipment for measurement control and laboratory use e EN 61010 1 1993 A2 1995 IEC 61010 1 1990 A2 1995 e UL3111 1 1994 e CAN CSA c22 no 1010 1 1992 A2 1997 Electromagnetic Compatibility CE C Tick and FCC Part 15 Class A Compliant Electrical emissions eene EN 55011 Class A at 10m FCC Part 15A above 1 GHz Electrical immunity Evaluated to EN 61326 1997 A1 1998 Table 1 hy Note For full EMC compliance you must operate this device with shielded cabling In addition all covers and filler panels must be installed Refer to the Declaration of Conformity DoC for this product for any additional regulatory compliance information DAQCard 1200 User Manual A 8 ni com Appendix A Specifications To obtain the DoC for this product click Declaration of Conformity at ni com hardref nsf This web site lists the DoCs by product family Select the appropriate product family followed by your product and a link to the DoC appears in Adobe Acrobat format Click the Acrobat icon to download or read the DoC National Instruments Corporation A 9 DAQCard 1200 User Manual Differences among the Lab PC the DAQPad 1200 and the DAQCard 1200
11. 8 V Input high voltage 2 2V 5 3 V Output low voltage out 4 mA 0 45 V Output high voltage our 1 mA 3 7 V A 6 ni com Appendix A Specifications Pro t Gtloi 4 eee eniti 0 5 to 5 5 V powered on 0 5 V powered off Resolution Counters timers eese 16 bits Compatibility eee TTL Base clocks available 2 MHz Base clock accuracy x50 ppm max Max source frequency 8 MHz Min source pulse duration 125 ns Min gate pulse duration Data transfers Digital Trigger Compatibility Response Pulse width Bus Interface Slave Power Requirement 5 VDC 45 Physical 150 mA operating 50 mA power down mode plus any current drawn through the I O connector 5 line Dimensions eo 8 56 by 5 40 cm 3 37 by 2 13 in PC Card type I O connector National Instruments Corporation A 7 DAQCard 1200 User Manual Appendix A Specifications Maximum Working Voltage Maximum working voltage refers to the signal voltage plus the common mode voltage Channel to earth eeeeeee 30 VAC or 60 VDC installation category I Channel to channel 30 VAC or 60 VDC installation category I Environmental Operating temperature sssse 0 to 50 C Storage temperature esses 55 to 150 C Humidity ient
12. Counter B1 is a scan interval counter in timed A D conversions The scan interval counter or scan clock controls the time between when the first channel in the scan is sampled and when that channel is sampled again When the scan interval counter is used in conjunction with the sample interval counter this is referred to as interval scanning For a more complete description of interval and round robin scanning refer to Figure 3 12 0123 0123 0123 012301230123 jd LI LL E E e a S p e T T Interchannel Delay Scan Interval Interchannel Delay Interval Scanning Round Robin Scanning DAQCard 1200 User Manual Figure 3 12 Interval Scanning and Round Robin Scanning 3 22 ni com Chapter 3 Connecting the Signals Instead of using counter AO as the sample interval counter you can use EXTCONV to externally time conversions Figure 3 13 shows the timing requirements for the EXTCONV input A falling edge on the EXTCONV initiates an A D conversion Vin EXTCONV pem ly ty 250 ns minimum Vi j A D Conversion Starts within 125 ns from this Point Figure 3 13 EXTCONV Signal Timing The external control signal EXTTRIG can either start a DAQ sequence or terminate an ongoing DAQ sequence depending on the mode posttrigger or pretrigger These modes are software selectable R Note LabVIEW is scan clock oriented When you specify the scan rate you are controlling t
13. Mode 2 Timing Specifications for Bidirectional Transfers National Instruments Corporation 3 21 DAQCard 1200 User Manual Chapter 3 Connecting the Signals Connecting Analog 1 0 and General Purpose Timing Signals Pins 38 through 48 of the front connector are connections for timing I O signals The DAQCard 1200 timing I O uses two 82C53 counter timer integrated circuits One circuit designated 82C53 A is used exclusively for DAQ timing and the other 82C53 B is available for general use You can use pins 38 through 40 and pin 43 to carry external signals for DAQ timing in place of the dedicated 82C53 A These signals are explained in the next section Analog Input Timing Connections Pins 41 through 48 carry general purpose timing signals from 82C53 B These signals are explained in the General Purpose Timing Connections section Analog Input Timing Connections Each 82C53 counter timer circuit contains three counters Counter 0 on the 82C53 A counter timer referred to as AO is a sample interval counter in timed A D conversions The sample interval counter or channel clock controls the time between A D conversions A sample interval is also referred to as the interchannel delay Counter 1 on the 82C53 A counter timer referred to as Al is a sample counter in timed A D conversions Therefore counter A1 stops data acquisition after a predefined number of samples These counters are not available for general purpose use
14. PAO PA2 PA4 PA6 PBO PB2 PB4 PB6 PCO PC2 PC4 PC6 EXTTRIG EXTCONV GATBO GATB1 OUTB2 CLKB2 DGND DAQCard 1200 User Manual Figure 3 1 DAQCard 1200 1 0 Connector Pin Assignments 3 2 ni com Chapter 3 Connecting the Signals Signal Connection Descriptions Table 3 1 describes the connector pins on the DAQCard 1200 front I O connector by pin number and gives the signal name and information about each signal connector pin Table 3 1 Signal Descriptions Pins 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 9 AISENSE AIGND AI AGND Analog Input Sense Analog Input Ground Connected to AGND in RSE mode analog input sense in NRSE mode 10 DACOOUT AO AGND DACO Output Voltage output signal for analog output channel 0 11 AGND N A N A Analog Ground Analog output ground reference for analog output voltages This signal is the bias current return point for differential measurements 12 DACIOUT AO AGND DACI Output Voltage output signal for analog output channel 1 13 DGND N A N A Digital Ground Voltage ground reference for the digital signals and the 5 V supply 14 21 PA lt 0 7 gt DIO DGND Port A 0 through 7 Bidirectional data lines for port A PA7 is the MSB and PAO is the LSB 22 29 PB lt 0 7 gt DIO DGND Port B 0 through 7 Bidirectional data lines
15. SUITABILITY OF NATIONAL INSTRUMENTS PRODUCTS WHENEVER NATIONAL INSTRUMENTS PRODUCTS ARE INCORPORATED IN A SYSTEM OR APPLICATION INCLUDING WITHOUT LIMITATION THE APPROPRIATE DESIGN PROCESS AND SAFETY LEVEL OF SUCH SYSTEM OR APPLICATION Compliance FCC Canada Radio Frequency Interference Compliance Determining FCC Class The Federal Communications Commission FCC has rules to protect wireless communications from interference The FCC places digital electronics into two classes These classes are known as Class A for use in industrial commercial locations only or Class B for use in residential or commercial locations Depending on where it is operated this product could be subject to restrictions in the FCC rules In Canada the Department of Communications DOC of Industry Canada regulates wireless interference in much the same way Digital electronics emit weak signals during normal operation that can affect radio television or other wireless products By examining the product you purchased you can determine the FCC Class and therefore which of the two FCC DOC Warnings apply in the following sections Some products may not be labeled at all for FCC if so the reader should then assume these are Class A devices FCC Class A products only display a simple warning statement of one paragraph in length regarding interference and undesired operation Most of our products are FCC Class A The FCC rules have restrictions regarding t
16. all measurements are made with respect to a common NRSE measurement system reference but the voltage at this reference can vary with respect to the measurement system ground Output Buffer Full a low singal on this handshaking line indicates that data has been written from the specified port output signal G 6 ni com P PCMCIA PPI RAM RD RH RMA rms RSE RTD SCXI STB Glossary an expansion bus architecture that has found widespread acceptance as a de facto standard in notebook size computers It originated as a specification for add on memory cards written by the Personal Computer Memory Card International Association programmable peripheral interface random access memory Read the read signal generated from the parallel port interface circuitry relative humidity Return Material Authorization root mean square referenced single ended mode input mode where the negative input of the instrumentation amplifier is referenced to AISENSE AIGND which is tied to ground through about 200 Q resistance default setting for the DAQcCard 1200 resistance temperature detector samples seconds Signal Conditioning eXtensions for Instrumentation the National Instruments product line for conditioning low level signals within an external chassis near sensors so only high level signals are sent to DAQ devices in the noisy PC environment Strobe Input A low signal on this handshaking ine loads data iont the
17. devices such as the LED shown in Figure 3 8 3 Note The 82C55A has only one configuration register Therefore you must program the direction input output of all ports before writing or reading from them to prevent data loss caused by the ports being reset to their default state DAQCard 1200 User Manual 3 16 ni com Chapter 3 Connecting the Signals Port C Pin Connections The signals assigned to port C depend on how the 82C554 is configured In mode 0 or no handshaking configuration port C is configured as two 4 bit I O ports In modes 1 or 2 or handshaking configuration port C is used for status and handshaking signals with zero two or three lines available for general purpose I O Table 3 4 summarizes the port C signal assignments for each configuration 3 Note Table 3 4 shows both the port C signal assignments and the terminology correlation between different documentation sources The 82C55A terminology refers to the different 82C55A configurations as modes whereas NI DAQ and LabVIEW documentation refers to them as handshaking and no handshaking These signal assignments are the same for all four 82C55A PPIs Table 3 4 Port C Signal Assignments Configuration Terminology Signal Assignments 82C55A DAQCard 1200 NI DAQ User Manual LabVIEW PC7 PC6 PCS PC4 PC3 PC2 PCI PCO Mode 0 No T O T O T O T O Io IO IO T O Basic I O Handshaking Mode 1 Handshaking vO vo IBF STB
18. float An instrument or device that supplies an isolated output falls into the floating signal source category Ground Referenced Signal Sources A ground referenced signal source is connected in some way to the building system ground and is therefore already connected to a common ground point with respect to the DAQCard 1200 assuming that the computer is plugged into the same power system Nonisolated outputs of instruments and devices that plug into the building power system fall into this category 3 6 ni com Chapter 3 Connecting the Signals The difference in ground potential between two instruments connected to the same building power system is typically between 1 mV and 100 mV but can be much higher if power distribution circuits are improperly connected The connection instructions that follow for grounded signal sources eliminate this ground potential difference from the measured signal Sy Note Ifyou power both the DAQCard 1200 and the PC with a floating power source such as a battery the system may be floating with respect to earth ground In this case treat all the signal sources as floating sources Input Configurations You can configure the DAQCard 1200 for one of three input modes RSE NRSE or DIFF The following sections discuss the use of single ended and differential measurements and give considerations for measuring both floating and ground referenced signal sources Table 3 3 summarizes the recommended input m
19. fully software configurable and factory calibrated so that you can easily install the card and begin acquiring data The low power consumption of the DAQCard 1200 makes this card ideal for use in portable computers and makes portable data acquisition practical The card requires very little power when operating thus extending the life of your computer batteries In addition the low cost and multifunctional nature of a system based on the DAQCard 1200 makes it ideal for laboratory work in industrial and academic environments The multiple channel analog input is useful in signal analysis and data logging The 12 bit ADC is useful in high resolution applications such as chromatography temperature measurement and DC voltage measurement You can use the AO channels to generate experimental stimuli or for machine and process control and analog function generation You can use the 24 TTL compatible DIO lines for switching external devices such as transistors and solid state relays for reading the status of external digital logic and for generating interrupts You can use the counter timers to synchronize events generate pulses and measure frequency and time The DAQCard 1200 used in conjunction National Instruments Corporation 1 1 DAQCard 1200 User Manual Chapter 1 Introduction with the PC is a versatile cost effective and portable platform for laboratory test measurement and control The DAQCard 1200 is shipped with NI DAQ th
20. help Canadian Department of Communications This Class B digital apparatus meets all requirements of the Canadian Interference Causing Equipment Regulations Cet appareil num rique de la classe B respecte toutes les exigences du R glement sur le mat riel brouilleur du Canada Compliance to EU Directives Readers in the European Union EU must refer to the Manufacturer s Declaration of Conformity DoC for information pertaining to the CE Mark compliance scheme The Manufacturer includes a DoC for most every hardware product except for those bought for OEMs if also available from an original manufacturer that also markets in the EU or where compliance is not required as for electrically benign apparatus or cables To obtain the DoC for this product click Declaration of Conformity at ni com hardref nsf This Web site lists the DoCs by product family Select the appropriate product family followed by your product and a link to the DoC appears in Adobe Acrobat format Click the Acrobat icon to download or read the DoC Certain exemptions may apply in the USA see FCC Rules 815 103 Exempted devices and 15 105 c Also available in sections of CFR 47 The CE Mark Declaration of Conformity will contain important supplementary information and instructions for the user or installer Contents About This Manual CONVENTIONS REE ES E xi National Instruments Documentation eesseeeseeeseeeeee eere
21. in which case the user will be required to correct the interference at his own expense Canadian Department of Communications This Class A digital apparatus meets all requirements of the Canadian Interference Causing Equipment Regulations Cet appareil num rique de la classe A respecte toutes les exigences du R glement sur le mat riel brouilleur du Canada Class B Federal Communications Commission This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for
22. input latch National Instruments Corporation G 7 DAQCard 1200 User Manual Glossary T TIO TTL two s complement U unipolar DAQCard 1200 User Manual timing input output transistor transistor logic given a number x expressed in base 2 with n digits to the left of the radix point the base 2 number 2n x a signal range that is always positive for example 0 to 10 V volts volts alternating current positive supply voltage from the PCMCIA bus usually 5V volts direct current virtual instrument 1 a combination of hardware and or software elements typically used with a PC that has the functionality of a classic stand alone instrument 2 a LabVIEW software module VI which consists of a front panel user interface and a block diagram program volts input high volts input low volts in volts output high volts output low Write the write signal generated from the parallel port interface circuitry G 8 ni com Index Symbols 5 V signal table 3 4 A ACH lt 0 7 gt signal description table 3 3 signal ranges 3 4 bipolar and unipolar analog input table 3 5 ACK signal table 3 18 AGND signal analog input signal connections 3 4 description table 3 3 AISENSE AIGND signal analog common signal 3 4 description table 3 3 amplifier characteristic specifications A 2 analog input See also analog input modes analog input signal connections circuitry 4 6 con
23. inputs of the instrumentation amplifier through input multiplexers on the DAQCard 1200 The instrumentation amplifier converts two input signals to a signal that is the difference between the two input signals multiplied by the gain setting of the amplifier The amplifier output voltage is referenced to the DAQCard 1200 ground The DAQCard 1200 ADC measures this output voltage when it performs A D conversions All signals must be referenced to ground either at the source device or at the DAQCard 1200 If you have a floating source you must use a ground referenced input connection at the DAQCard 1200 If you have a grounded source you must use a nonreferenced input connection at the DAQCard 1200 Types of Signal Sources When configuring the input mode of the DAQCard 1200 and making signal connections you must first determine whether the signal source is floating or ground referenced This section describes these two types of signals Floating Signal Sources A floating signal source is not connected in any way to the building ground system but has an isolated ground reference point Some examples of floating signal sources are outputs of transformers thermocouples battery powered devices optical isolator outputs and isolation amplifiers You must tie the ground reference of a floating signal to the DAQCard 1200 AI ground to establish a local or onboard reference for the signal Otherwise the measured input signal varies or appears to
24. of signal sources 3 6 analog output signal connections 3 14 DAQ and general purpose timing signal connections data acquisition timing connections 3 22 general purpose timing connections 3 26 3 27 pins 3 22 power connections 3 31 digital I O signal connections illustration 3 16 pins 3 15 port C pin connections 3 17 timing specifications mode 1 input timing 3 19 mode 1 output timing 3 20 mode 2 bidirectional timing 3 20 ni com I O connector exceeding maximum ratings caution 3 1 pin assignments figure 3 2 signal descriptions table 3 3 signal descriptions 3 3 single ended connections floating signal sources RSE configuration 3 11 ground referenced signal sources NRSE configuration 3 12 when to use 3 11 software programming choices National Instruments ADE software 1 4 NI DAQ driver software 1 2 specifications analog input amplifier characteristics A 2 dynamic characteristics A 3 input characteristics A 1 stability A 4 transfer characteristics A 2 analog output dynamic characteristics A 5 output characteristics A 4 stability A 5 transfer characteristics A 4 voltage output A 5 bus interface A 7 digital I O A 5 physical A 7 power requirements A 7 timing I O A 6 square wave generation 3 28 stability analog input specifications A 4 analog output specifications A 5 STB signal table 3 18 system integration by National Instruments E 1 National Inst
25. the instrumentation amplifier referenced to AISENSE AIGND which is tied to ground through about 200 Q resistance default setting NRSE NRSE mode provides eight single ended inputs with the negative input of the instrumentation amplifier tied to AISENSE AIGND which is not connected to ground DAQCard 1200 User Manual While reading the following paragraphs you may find it helpful to refer to the Connecting Analog Input Signals section of Chapter 3 Connecting the Signals which contains diagrams showing the signal paths for the three modes These three modes are software selectable DIFF Input Mode Four Channels DIFF input mode 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 DIFF input mode the DAQCard 1200 can monitor four different analog input signals 2 4 ni com Chapter 2 Installing and Configuring the DAQCard 1200 Considerations for using DIFF input mode are discussed in Chapter 3 Connecting the Signals Notice that the signal return path is through the negative terminal of the instrumentation amplifier and through channel 1 3 5 or 7 depending on which channel pair you select RSE Input Mode Eight Channels Default Setting RSE input mode means that all input signals are referenced to a common ground point that is also tied to the DAQCard 1200 AI ground The RSE mode is u
26. to test the DAQCard without having to program the DAQCard If you are using Windows MAX has a Test Panel option that is available by clicking Devices and Interfaces and then clicking the device The Test Panels are excellent tools for performing simple functional tests of the DAQCard such as analog input and output digital I O and counter timer tests If you are using Mac OS the NI DAQ Configuration Utility provides the same functionality Operating the DAQCard 1200 When using the DAQCard in differential analog input mode I have connected a differential input signal but the readings are random and drift rapidly What s wrong Check the ground reference connections The signal may be referenced to a level that is considered floating with reference to the DAQCard ground reference Even if you are in differential mode the signal must still be National Instruments Corporation C 1 DAQCard 1200 User Manual Appendix C Common Questions DAQCard 1200 User Manual referenced to the same ground level as the DAQCard reference Chapter 3 Connecting the Signals outlines the various methods used to achieve the same ground level while maintaining a high CMRR I want to use NI DAQ to program the DAQCard 1200 How can I determine which NI DAQ functions support the DAQCard If you are using NI DAQ 6 7 or later refer to the NI DAQ Function Reference Online Help file Click NI DAQ Functions Listed by Hardware Product for a complete li
27. 4 INTRA STBg IBFBg INTRg Strobed Input Mode 1 Handshaking OBF ACK Uo Uo INTRA ACKs OBFg INTRg Strobed Output Mode 2 Handshaking OBF4 ACK IBFA STB4 INTRA Lo T O T O Bidirectional Bus Indicates that the signal is active low Subscripts A and B denote port A or port B handshaking signals National Instruments Corporation 3 17 DAQCard 1200 User Manual Chapter 3 Connecting the Signals Timing Specifications Use the handshaking lines STB and IBF to synchronize input transfers Use the handshaking lines OBF and ACK to synchronize output transfers The following signals are used in the timing diagrams shown later in this chapter 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 DAQCard 1200 OBF Output Output Buffer Full A low signal on this handshaking line indicates that data has been written from the specified port INTR Output Interrupt Request This signal beco
28. A but should be limited to 250 mA The fuse is a thermally resettable fuse which has an internal thermostat This thermostat opens when the current exceeds 1 A and the temperature rises After some time the thermostat cools down the switch closes and the 5 V is available once more Opening this fuse does not necessarily damage the DAQCard 1200 If you do not receive 5 V check for any shorts between the 5 V power pin and ground DAQCard 1200 User Manual 3 32 ni com Theory of Operation This chapter explains the operation of each functional unit of the DAQcCard 1200 Functional Overview The block diagram in Figure 4 1 shows a functional overview of the DAQcCard 1200 I O Connector Dither p n Input Pgm 12 Bit 1KS gt n gt IM PCMCIA Mux Gain A D FIFO lio Channel 4 DECORE Interface Circuitry Core Control Calibration i 3 Logic Signals 8 E re oH x 12 Bit q_ 8 82C55A 82C53 9 D A Digital Ctr Timer le gt Interface Group A 8 X Interrupt a Interface gt 12 Bit 8 pa gt 1 lt 4 4 82C53 8 1MHz tM__ Ctr Timer Timebase DC DC 5V Group B lt __ Converter 2 MHz Time Timebase Divider le 20 MHz Oscillator aN Natio
29. AI channel National Instruments Corporation 3 9 DAQCard 1200 User Manual Chapter 3 Connecting the Signals Differential Connections for Grounded Signal Sources Figure 3 4 shows how to connect a ground referenced signal source to a DAQCard 1200 configured for DIFF input mode Refer to the Configuring Analog Input section of Chapter 2 Installing and Configuring the DAQCard 1200 for configuration instructions Grounded Signal Source M Common Mode Noise H Ground Potential Front I O Connector 2 ACH 1 0 0 5 4 ACH3 oo 5 6 ACH5 Gi i 8 ACH7 so i 11 AGND Measured Voltage m DAQCard 1200 in DIFF Configuration DAQCard 1200 User Manual Figure 3 4 Differential Input Connections for Grounded Signal Sources With this connection type the instrumentation amplifier rejects both the common mode noise in the signal and the ground potential difference between the signal source and the DAQCard 1200 ground which is shown as Vem in Figure 3 4 3 10 ni com Chapter 3 Connecting the Signals Single Ended Connection Considerations RSE and NRSE Input Modes Single ended connections are those in which all DAQCard 1200 AI signals are referenced to one common ground The input signals are tied to the positive input of the instrumentation amplifier and their common ground point is tied to the negative input of the instrum
30. B ims 0 5 LSB ims 100 0 5 LSB ims 0 7 LSB ims National Instruments Corporation A 3 DAQCard 1200 User Manual Appendix A Specifications Stability Recommended warm up time 15 minutes Offset temperature coefficient Pre gainizzsssseseeneeatee ees 15 uV C POSE SAID oo cette trees 100 uV C Gain temperature coefficient 40 ppm C Analog Output Output Characteristics Number of Channels 2 voltage R solution 5i ecrire 12 bits 1 in 4 096 Max update rate ssssesseesenee 20 kS s Type ot DAC deeem te d Double buffered Data transfers iinis onsa Interrupts programmed I O Transfer Characteristics Relative accuracy INL 0 5 LSB typ 1 LSB max DNE uui ake ae ee n 0 5 LSB typ 0 9 LSB max Monotonicity eese 12 bits guaranteed Offset error After calibration 0 5 mV max Before calibration 75 mV max Gain error relative to internal reference After calibration 0 02 of reading max Before calibration 2 of reading max 1 f you perform simultaneous AI and AO reliable continuous rates are limited to 0 5 to 1 kS s and are configuration dependent DAQCard 1200 User Manual A 4 ni com Voltage Output Output coupling eee Output impedance sess Curre
31. DAQ DAQCard 1200 User Manual Multifunction 1 0 Card for the PCMCIA Bus Wy NATIONAL December 2001 Edition P INSTRUMENTS Part Number 320936C 01 Worldwide Technical Support and Product Information ni com National Instruments Corporate Headquarters 11500 North Mopac Expressway Austin Texas 78759 3504 USA Tel 512 683 0100 Worldwide Offices Australia 03 9879 5166 Austria 0662 45 79 90 0 Belgium 02 757 00 20 Brazil 011 3262 3599 Canada Calgary 403 274 9391 Canada Montreal 514 288 5722 Canada Ottawa 613 233 5949 Canada Qu bec 514 694 8521 Canada Toronto 905 785 0085 China Shanghai 021 6555 7838 China ShenZhen 0755 3904939 Czech Republic 02 2423 5774 Denmark 45 76 26 00 Finland 09 725 725 11 France 01 48 14 24 24 Germany 089 741 31 30 Greece 30 1 42 96 427 Hong Kong 2645 3186 India 91 80 535 5406 Israel 03 6393737 Italy 02 413091 Japan 03 5472 2970 Korea 02 3451 3400 Malaysia 603 9596711 Mexico 001 800 010 0793 Netherlands 0348 433466 New Zealand 09 914 0488 Norway 32 27 73 00 Poland 0 22 528 94 06 Portugal 351 210 311 210 Russia 095 238 7139 Singapore 2265886 Slovenia 386 3 425 4200 South Africa 11 805 8197 Spain 91 640 0085 Sweden 08 587 895 00 Switzerland 056 200 51 51 Taiwan 02 2528 7227 United Kingdom 01635 523545 For further support information see the Technical Support Resources appendix To comment on the documentation send e mail to techpubseni com 1995 2001 Nat
32. DAQCard 1200 3 12 ni com Chapter 3 Connecting the Signals Ground Referenced Signal Source Noise Common Mode 6 C o1 AGND NA Yo Q E 8 ACH7 So 9 AISENSE AIGND Measured Front I O Connecto m Voltage r DAQCard 1200 in NRSE Input Configuration Figure 3 6 Single Ended Input Connections for Grounded Signal Sources Common Mode Signal Rejection Considerations Figures 3 4 and 3 6 show connections for signal sources that are already referenced to some ground point with respect to the DAQCard 1200 In these cases the instrumentation amplifier can reject any voltage caused by ground potential differences between the signal source and the DAQCard 1200 In addition with differential input mode connections the instrumentation amplifier can reject common mode noise pickup in the leads connecting the signal sources to the DAQCard 1200 The common mode input range of the DAQCard 1200 instrumentation amplifier is the magnitude of the greatest common mode signal that can be rejected The common mode input range for the DAQCard 1200 depends on the size of the differential input signal Vai Vin Vj and the gain setting of the instrumentation amplifier In unipolar mode the differential input range is 0 to 10 V In bipolar mode the differential input range is from 5 to 5 V Vn should remain within a range of 6 t
33. DAQPad 1200 and DAQCard 1200 B 1 mode 1 input timing 3 19 mode 1 output timing 3 20 mode 2 bidirectional timing 3 20 National Instruments Alliance Program E 1 customer education E 1 Developer Zone E 1 system integration services E 1 technical support E 1 Web support E 1 worldwide offices E 2 National Instruments documentation xii NI Developer Zone E 1 NI DAQ driver software 1 2 National Instruments Corporation l 5 Index NRSE input configuration 2 5 definition table 2 4 recommended input configurations table 3 7 single ended connections for ground referenced signal sources 3 12 0 OBF signal table 3 18 online technical support E 1 operation of DAQCard 1200 See theory of operation optional equipment 1 4 OUT signals general purpose timing signal connections 3 27 timing requirements signals figure 3 31 OUTBO signal table 3 3 OUTBI signal DAQ timing connections 3 25 description table 3 3 maximum voltage input rating 3 27 OUTB2 signal table 3 4 P PA lt 0 7 gt signal description table 3 3 digital I O signal connections 3 15 PB lt 0 7 gt signal description table 3 3 digital I O signal connections 3 15 PC Card I O channel interface circuitry block diagram figure 4 2 theory of operation 4 3 PC lt 0 7 gt signal description table 3 3 digital I O signal connections 3 15 DAQCard 1200 User Manual Index physical specifications A 7 pin assign
34. Fused for up to 1 A of 5 V supply but limit current to 250 mA 50 DGND N A N A Digital Ground Voltage ground reference for the digital signals and the 5 V supply Indicates that the signal is active low AI Analog Input AO Analog Output DI Digital Input DIO Digital Input Output DO Digital Output N A Not Applicable The connector pins are grouped into AI signal pins AO signal pins DIO signal pins TIO signal pins and power connections Signal connection guidelines for each group is described in the following sections Connecting Analog Input Signals AN Pins 1 through 8 are analog input signal pins for the 12 bit ADC Pin 9 AISENSE AIGND is an analog common signal You can use this pin as a signal ground connection to the DAQCard 1200 in RSE mode or as a return path in NRSE mode Pin 11 AGND is the bias current return point for differential measurements Pins 1 through 8 are tied through 4 7 kQ series resistances to the eight single ended AI channels of the input multiplexer Pins 2 4 6 and 8 are also tied to an input multiplexer for DIFF mode The signal ranges for inputs ACH lt 0 7 gt at all possible gains are shown in Table 3 2 Exceeding the input signal range does not damage the input circuitry as long as the maximum input voltage rating of 35 V powered on and 25 V powered off is not exceeded The DAQCard 1200 is guaranteed to withstand inputs up to the maximum input voltage
35. IA Socket O Cable I O Signals Figure 2 1 A Typical Configuration for the DAQCard 1200 DAQCard 1200 User Manual 2 2 ni com Chapter 2 Installing and Configuring the DAQCard 1200 Configuring the DAQCard 1200 Because of the NI standard architecture for data acquisition the DAQCard 1200 is completely software configurable Data acquisition related configuration which you must perform includes such settings as analog input coupling and range and others You can modify these settings using NI DAQ or application level software such as LabVIEW and Measurement Studio To configure the device in Measurement amp Automation Explorer MAX refer to either the DAQ Quick Start Guide or to the NI DAQ User Manual for PC Compatibles Configuring Analog Input At startup the DAQCard 1200 defaults to the following configuration e Referenced single ended input mode e 5 V Al range Table 2 1 lists the available AI configurations for the DAQCard 1200 and shows the default settings Table 2 1 Analog Input Settings Parameter Configuration Analog Input Bipolar 5 V default setting Polarity Unipolar 0 10 V Analog Input Mode Referenced single ended RSE default setting Non referenced single ended NRSE Differential DIFF The analog input circuitry is software configurable UN Caution Connections including power signals to ground and vice versa that exceed any of the maximu
36. N OF THE SOFTWARE PRODUCTS CAN BE IMPAIRED BY ADVERSE FACTORS INCLUDING BUT NOT LIMITED TO FLUCTUATIONS IN ELECTRICAL POWER SUPPLY COMPUTER HARDWARE MALFUNCTIONS COMPUTER OPERATING SYSTEM SOFTWARE FITNESS FITNESS OF COMPILERS AND DEVELOPMENT SOFTWARE USED TO DEVELOP AN APPLICATION INSTALLATION ERRORS SOFTWARE AND HARDWARE COMPATIBILITY PROBLEMS MALFUNCTIONS OR FAILURES OF ELECTRONIC MONITORING OR CONTROL DEVICES TRANSIENT FAILURES OF ELECTRONIC SYSTEMS HARDWARE AND OR SOFTWARE UNANTICIPATED USES OR MISUSES OR ERRORS ON THE PART OF THE USER OR APPLICATIONS DESIGNER ADVERSE FACTORS SUCH AS THESE ARE HEREAFTER COLLECTIVELY TERMED SYSTEM FAILURES ANY APPLICATION WHERE A SYSTEM FAILURE WOULD CREATE A RISK OF HARM TO PROPERTY OR PERSONS INCLUDING THE RISK OF BODILY INJURY AND DEATH SHOULD NOT BE RELIANT SOLELY UPON ONE FORM OF ELECTRONIC SYSTEM DUE TO THE RISK OF SYSTEM FAILURE TO AVOID DAMAGE INJURY OR DEATH THE USER OR APPLICATION DESIGNER MUST TAKE REASONABLY PRUDENT STEPS TO PROTECT AGAINST SYSTEM FAILURES INCLUDING BUT NOT LIMITED TO BACK UP OR SHUT DOWN MECHANISMS BECAUSE EACH END USER SYSTEM IS CUSTOMIZED AND DIFFERS FROM NATIONAL INSTRUMENTS TESTING PLATFORMS AND BECAUSE A USER OR APPLICATION DESIGNER MAY USE NATIONAL INSTRUMENTS PRODUCTS IN COMBINATION WITH OTHER PRODUCTS IN A MANNER NOT EVALUATED OR CONTEMPLATED BY NATIONAL INSTRUMENTS THE USER OR APPLICATION DESIGNER IS ULTIMATELY RESPONSIBLE FOR VERIFYING AND VALIDATING THE
37. This appendix contains a summary of the functional differences between the Lab PC the DAQPad 1200 and the DAQCard 1200 The Lab PC is a plug in DAQ device for PCs It has jumpers for allocating bus resources such as base address interrupt and DMA channels as well as analog input output resources such as input output mode and polarity It also has potentiometers for calibration The DAQPad 1200 is a DAQ device that plugs into the parallel port of the computer It is functionally identical to the Lab PC In addition there are no jumpers for bus resource allocation this is done at configuration time with software It also has no potentiometers because it is software calibrated The DAQPad 1200 is register compatible with the Lab PC It has a few additional registers for calibration purposes The DAQCard 1200 is register compatible with the DAQPad 1200 and the Lab PC and is functionally identical to it Register level software developed for the Lab PC works directly on a configured DAQCard 1200 However you calibrate the DAQCard 1200 with software instead of with potentiometers National Instruments Corporation B 1 DAQCard 1200 User Manual Appendix B Differences among the Lab PC the DAQPad 1200 and the DAQCard 1200 The following table summarizes the differences among the three products Functionality Lab PC DAQPad 1200 DAQCard 1200 Bus resource allocation Jumpers Software Software automatic Calibrat
38. XTUPDATE Signal Timing for Updating DAC Output 3 Note You should configure both DACs in either immediate update mode or in later update mode but not in a combination of the two modes Although you can configure the DACs in a combination of modes doing so can result in glitches on the immediate update DAC if the update rate on the waveform DAC is high Refer to the Analog Output section in Chapter 4 Theory of Operation for details on this behavior The following rating applies to the EXTCONV EXTTRIG OUTB1 and EXTUPDATE signals e Absolute maximum voltage input rating 0 5 to 5 5 V with respect to DGND Refer to the NI DAQ manual or to Chapter 4 Theory of Operation for more information concerning the various modes of data acquisition and analog output General Purpose Timing Connections 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 many general purpose applications such as pulse and square wave generation event counting and pulse width time lapse and frequency National Instruments Corporation 3 27 DAQCard 1200 User Manual Chapter 3 Connecting the Signals measurement For these applications the CLK and GATE signals at the front I O connector control the counters The single exception is counter BO which has an internal 2 MHz clock Refer to the DAQCard 1200 Register Level Programmer Manual for programming informati
39. agram of the AI circuitry National Instruments Corporation 4 5 DAQCard 1200 User Manual Chapter 4 Theory of Operation Data zo ACHO m gt EE toni ae 45 ACH1 gt a 12 Bit Sample gt ACH2 and Hold ADC CET ai A D lt _ 5 FIFO e ACH3 m gt G ACH4 Mux conv Data ACH5 gt AVAIL B ACH6 gt PL MAE g 3 E gt 8 a c ACH WRTRD 8 AISENSE amp gt Gain o AIGND E Select Mux Q 9 5 Counter lt x O 2 2 E 6 2 e Dither 9 Dither Circuitry Dither Enable c DAQ A Counter Timer 2 EXTTRIG External Trigger p Timing Signals x Q EXTCONV External Convert A 8 ial OUTB1 Output B1 iw A Figure 4 4 Analog Input Circuitry Analog Input Circuitry DAQCard 1200 User Manual The analog input circuitry consists of two analog input multiplexers mux counter gain select circuitry a software programmable gain amplifier a 12 bit ADC and a 12 bit FIFO memory that is sign extended to 16 bits The two input multiplexers route the input channels to the instrumentation amplifier in either RSE NRSE or DIFF input mode The input multiplexers provide input overvoltage protection of 35 V powered on and 25 V powered off The mux counters control the input multiplexers The DAQCard 1200 can perform either single channel data acquisition or multiple ch
40. al Contents Chapter 3 Connecting the Signals TO Connector 52 vss nent etd etate t e E PR t E Oe tps 3 1 Signal Connection Descriptions aissis rennen ee em eere nennen 3 3 Connecting Analog Input Signals eee 3 4 Types of Signal Sources esee eterne 3 6 Floating Signal Sources esee 3 6 Ground Referenced Signal Sources sss 3 6 Input Configurations ea E a E enne 3 7 Differential Connection Considerations DIFF Input Mode eene 3 7 Single Ended Connection Considerations RSE and NRSE Input Modes eee 3 11 Common Mode Signal Rejection Considerations 3 13 Connecting Analog Output Signals eese 3 14 Connecting Digital I O Signals eere 3 15 Port C Pii Connections yi od eot aep metet eet dett 3 17 Timing Specifications eere ee peperit tetris 3 18 Mode 1 Input Timing enrii na n a 3 19 Mode 1 Output Timing eee 3 20 Mode 2 Bidirectional Timing eee 3 20 Connecting Analog I O and General Purpose Timing Signals 3 22 Analog Input Timing Connections eee 3 22 Analog Output Timing Connections eee 3 26 General Purpose Timing Connections eee 3 27 Connecting the POWet s dee tat etr enne RP GYRO 3 31 Chapter 4 Theory of Operation Furi
41. an use the MSM82C53A counter timers for general purpose timing applications such as pulse and square wave generation event counting and pulse width time lapse and frequency measurements For information about configuring the MSM82C53A refer to the Analog Input Timing Connections section of Chapter 3 Connecting the Signals 2 6 ni com Connecting the Signals This chapter describes the signals on the DAQCard 1200 I O connector 1 0 Connector Figure 3 1 shows the pin assignments for the DAQCard 1200 T O connector This connector is attached to the ribbon cable that extends from the PC Card slot when the card is installed and the cable is connected UN Caution Connections including power signals to ground and vice versa that exceed any of the maximum ratings of input or output signals on the DAQCard 1200 can damage the DAQCard 1200 and the computer NI is not liable for damage resulting from any such signal connections National Instruments Corporation 3 1 DAQCard 1200 User Manual Chapter 3 Connecting the Signals ACHO ACH2 ACH4 ACH6 AISENSE AIGND AGND DGND PA1 PAS PA5 PA7 PB1 PB3 PB5 PB7 PC1 PC3 PC5 PC7 EXTUPDATE OUTBO OUTB1 CLKB1 GATB2 45V O AJN 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 ACH1 ACH3 ACH5 ACH7 DACOOUT DAC1OUT
42. annel scanned data acquisition These two modes are software selectable For single channel data acquisition you select the channel and gain before initiating data acquisition These gain and multiplexer settings remain constant during the entire DAQ process For multiple channel data acquisition you select the highest numbered channel and gain before data acquisition is initiated 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 eight to two Notice that the same gain setting is used for all channels in the scan sequence 4 6 ni com Chapter 4 Theory of Operation 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 DAQCard 1200 provides 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 DAQCard 1200 to more than 12 bits as in calibration In such applications which are often lower frequency in nature noise modulation is decreased and differential linearity is improved by the addition of the dither For high speed 12 b
43. as assigned the card to a section of memory it updates the PC Card control registers and initializes the card The rest of the circuitry consists of address decoders data buffers I O channel interface timing control circuitry and interrupt control circuitry The DAQCard 1200 uses two 82C53 counter timer integrated circuits for internal data acquisition and DAC timing and for general purpose I O timing functions Figure 4 3 shows a block diagram of both groups of timing circuitry counter groups A and B National Instruments Corporation 4 3 DAQCard 1200 User Manual Chapter 4 Theory of Operation GATEB2 m P GATEB2 CLKB2 P CLKB2 General Purpose Counter OUTB2 OUTB2 GATEB1 J GATEB1 OUTBO 7 MHz Source r CLKB1 S MUX Interval MER General A Purpose CLKB1 CLKAO Counter OUTB1 4 OUTB1 CTR RD OUTBO OUTBO GATEBO GATEBO SIDES Timebase EK Extension 8 P 5 General Z Ez Purpose o o Counter i E GATEB1 O o6 o 2 Source CEKBO SEES g o is o aa Sample Interval Counter OUTB1 OUTB1 EXTCONV GATEBI A D Conversion Logic rae 1 EXTTRIG CLKA2 GATEA2 OV CLKA2 GATEA2 EXTUPDATE DAC i Timing D A Conversion Logic OUTA2 82C53 Counter Timer Group A Figure 4 3 Timi
44. c precautions are necessary Remove the DAQCard 1200 from the package and inspect the device for loose components or any sign of damage Notify NI if the DAQCard 1200 appears damaged in any way Do not install a damaged device into your computer Store the DAQCard 1200 in the antistatic envelope when not in use Safety Information The following section contains important safety instructions that you must follow when installing and using the product Do not operate the product in a manner not specified in this document Misuse of the product can result in a hazard You can compromise the safety protection built into the product if the product is damaged in any way If the product is damaged return it to NI for repair Do not substitute parts or modify the product except as described in this document Use the product only with the chassis modules accessories and cables specified in the installation instructions You must have all covers and filler panels installed during operation of the product Do not operate the product in an explosive atmosphere or where there may be flammable gases or fumes Operate the product only at or below the pollution degree stated in Appendix A Specifications Pollution is foreign matter in a solid liquid or gaseous state that can reduce dielectric strength or surface resistivity The following is a description of pollution degrees e Pollution degree 1 means no pollution or only dry nonconductive p
45. ctional Overview E 4 1 PC Card I O Channel Interface Circuitry eese nee 4 2 ibi 4 3 Analog Input TRON AE EAE tert ete eee eere Tre ub eee eeu e egeret 4 5 Analog Input Circuitry 2 ett eme cete tee eee 4 6 Data Acquisition Timing ete de tend 4 8 Data Acquisition Operation esesseeseeeeeeeeerenne eee 4 8 Round Robin Data Acquisition eene 4 8 Interval Data Acquisition 4 8 Data Acquisition Rates ree Idm mem detis 4 9 DAQCard 1200 User Manual viii ni com Contents PurihnASid M PH 4 10 Analog Output Circuitry eret erp pte tpe rita 4 10 Power On State 4 ene enr i ER WARM nin heise 4 11 DAC Taringa e epa a P e A 4 11 Digital DO zi s is e ee ad o e s He e e A de Rees 4 12 Chapter 5 Calibration Loading Calibration Constant essere nne rennen emen 5 1 Self Calibration ne cer ed eto eid enc he eene 5 2 External Calibr tion eese et re a re ee tein 5 2 Appendix A Specifications Appendix B Differences among the Lab PC the DAQPad 1200 and the DAQ Card 1200 Appendix C Common Questions Appendix D Technical Support Resources Glossary Index National Instruments Corporation ix DAQCard 1200 User Manual About This Manual Conventions This manual describes the mechanical and electrical aspects of the National Instruments NI DAQCard 1200 and contains information concerning it
46. d 1200 has two connectors a 68 pin PCMCIA bus connector on one end and a 50 pin I O connector on the other end Notice that the card is keyed so that it can be inserted only one way iyi Note If the computer supports hot swapping you may insert or remove the DAQCard 1200 at any time whether the computer is powered on or off National Instruments Corporation 2 1 DAQCard 1200 User Manual Chapter 2 Installing and Configuring the DAQCard 1200 3 Visually verify the installation by making sure that the DAQCard 1200 is fully inserted into the slot 4 Attach the I O cable You can use either a 50 pin female or a 50 pin male cable to plug into the DAQCard 1200 For more information on these products refer to the Optional Equipment section in Chapter 1 Introduction Notice that the cable is keyed so that you can insert it only one way hl Note Be careful not to put strain on the I O cable when inserting it into and removing it from the DAQCard 1200 Always grasp the cable by the connector you are plugging or unplugging Never pull directly on the I O cable to unplug it from the DAQCard 1200 5 Plug in and power on the computer The DAQCard 1200 is now installed You are now ready to configure the hardware and software and to make the appropriate connections to the I O connector cable as described in Chapter 3 Connecting the Signals Figure 2 1 shows an example of a typical configuration Portable Computer PCMC
47. d 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 DAQ timing sequence using EXTTRIG and EXTCONV The DAQ operation has been initiated through software Notice that the sample counter has been programmed to allow five conversions after the rising edge on the EXTTRIG signal Additional transitions on the EXTTRIG line have no effect until you initiate a new DAQ sequence 3 24 ni com Chapter 3 Connecting the Signals ly Vin EXTTRIG LLLP t ty 50 ns minimum Vi First posttrigger sample EXTCONV Ium UL OW CONVERT E i A 4 4 4 Figure 3 15 Pretrigger DAQ Timing Because both pretrigger and posttrigger modes use EXTTRIG input you can only use one mode at a time Therefore you cannot use both a hardware start and a hardware stop trigger during the same acquisition Figure 3 16 shows an example of a multiple channel interval scanning DAQ 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 ed
48. e NI driver software that handles every function listed on the data sheet for our hardware Using NI DAQ you can start your application quickly and easily without having to program the card at the register level Utilities shipped with NI DAQ also can help you conserve additional power by configuring the DAQCard 1200 in the power down mode Detailed specifications of the DAQCard 1200 are in Appendix A Specifications What You Need to Get Started To set up and use the DAQCard 1200 you need the following items Q DAQCard 1200 DAQCard 1200 I O cable Q L DAQCard 1200 User Manual Q One of the following software packages and documentation LabVIEW for Windows or Mac 0S Measurement Studio for Windows L NI DAQ for PC compatibles or Mac OS C The computer Software Programming Choices NI DAQ DAQCard 1200 User Manual When programming NI data acquisition DAQ hardware you can use NI application development environment ADE software or other ADEs In either case you use NI DAQ NI DAQ which shipped with the DAQCard 1200 has an extensive library of functions that you can call from your ADE These functions allow you to use all the features of the DAQCard 1200 1 2 ni com Chapter 1 Introduction NI DAQ carries out many of the complex interactions such as programming interrupts between the computer and the DAQ hardware NI DAQ maintains a consistent software interface among its different v
49. e is called the immediate update mode In the second mode the DAC output voltage does not change until a low level is detected either from counter A2 of the timing circuitry or from EXTUPDATE This mode is useful for waveform generation These two modes are software selectable 3 Note Configure both DACs in either immediate update mode or later update mode Do not configure the DACs in a combination of both modes because doing so can result in premature updates on the waveform generation DAC whenever the immediate update DAC is updated Also if a waveform generation update occurs between an LSB write and an MSB write of the DAC in the immediate update mode you receive an incorrect value from that DAC until the MSB is written Both of these effects are minimal at high waveform update rates hy Note Delayed update mode is selected by NI DAQ when a timed or buffered AO operation is configured National Instruments Corporation 4 11 DAQCard 1200 User Manual Chapter 4 Digital 1 0 Theory of Operation The DIO circuitry has an 82C55A integrated circuit The 82C55A is a general purpose programmable peripheral interface PPI 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 DAQCard 1200 I O connector Figure 4 6 shows the DIO circuitry PA 0 7 PB lt 0 7 gt PC lt 0 7 gt 1 0 C
50. enne nnne xii Chapter 1 Introduction About the DAQCard 1200 i nca ed ette I e Ee EXE dreht eae stica eode 1 1 What Y ou Need to Get Started 5 te telo te eda e D dede adepti 1 2 Software Programming Choices essere eene eene eene 1 2 NEDAQ esa oa tte PO eed uti tei ain 1 2 National Instruments ADE Software esses 1 4 Optional Equipment ederet ree err eu pU 1 4 IUnpackifig Jt a Re pe YR Ne ERI UAE EE GE EHE PEQ Up cR EN RR HER 1 5 Safety Informatio serisine o re d e GI D RO E ERROR ERE e 1 5 Chapter 2 Installing and Configuring the DAQCard 1200 Installing the SoftWare tertie eet te eise eite o cubes I epe ott tp EDI 2 1 Installing the Hardware ute eterne te eie e P HY RR EE e eene eter duo 2 1 Configuring the DAQCard 1200 resi resides eseisto rennen eene 2 3 Configuring Analog Input eese enne eere 2 3 Analog Input Polarity eer eere 2 4 Analog Input Mode er eer eni eere ie redet dent iR tS 2 4 DIFF Input Mode Four Channels 2 4 RSE Input Mode Eight Channels Default Setting 2 5 NRSE Input Mode Eight Channels 2 5 Configuring Analog Output esses 2 5 Analog Output Polarity esee 2 6 Configuring Digital lO iio ee Re D e ERR RT 2 6 Conf suring COUDIEIS erect o i ree ben 2 6 National Instruments Corporation vii DAQCard 1200 User Manu
51. entation amplifier When the DAQCard 1200 is configured for single ended input RSE or NRSE eight AI channels are available You can use single ended input connections when the following criteria are met by all input signals e Input signals are high level greater than 1 V Leads connecting the signals to the DAQCard 1200 are less than 15 ft e All input signals share a common reference signal at the source If any of the preceding criteria are not met you should use DIFF input mode You can configure the DAQCard 1200 using software for two different types of single ended input modes RSE and NRSE Use RSE input mode for floating signal sources in this case the DAQCard 1200 provides the reference ground point for the external signal Use NRSE input mode for ground referenced signal sources in this case the external signal supplies its own reference ground point and the DAQCard 1200 should not supply one Single Ended Connections for Floating Signal Sources RSE Input Mode Figure 3 5 shows how to connect a floating signal source to a DAQCard 1200 configured for single ended input You must configure the DAQCard 1200 analog input circuitry for RSE input mode to make these connections For configuration instructions refer to the Configuring Analog Input section of Chapter 2 Installing and Configuring the DAQCard 1200 National Instruments Corporation 3 11 DAQCard 1200 User Manual Chapter 3 Connecting the Signals
52. ersions so that you can change platforms with minimal modifications to your code Whether you use LabVIEW Measurement Studio or other ADEs your application uses NI DAQ as illustrated in Figure 1 1 Conventional Programming Environment LabVIEW or Measurement Studio NI DAQ Driver Software Personal Computer or Workstation DAQ Hardware A Figure 1 1 The Relationship Between the Programming Environment NI DAQ and the Hardware To download a free copy of the most recent version of NI DAQ click Download Software at ni com National Instruments Corporation 1 3 DAQCard 1200 User Manual Chapter 1 Introduction National Instruments ADE Software LabVIEW features interactive graphics a state of the art interface and a powerful graphical programming language The LabVIEW Data Acquisition VI Library a series of virtual instruments VIs for using LabVIEW with National Instruments DAQ hardware is included with LabVIEW Measurement Studio which includes LabWindows CVI tools for Visual C and tools for Visual Basic is a development suite that allows you to use ANSI C Visual C and Visual Basic to design your test and measurement software For C developers Measurement Studio includes LabWindows CVI a fully integrated ANSI C application development environment that features interactive graphics and the LabWindows CVI Data Acquisition and Easy I O libraries For Vis
53. etected on the EXTUPDATE bit The interrupt service routine can write the next value to the DAC When the EXTUPDATE signal goes low the DAC is subsequently updated Therefore you can perform externally timed interrupt driven waveform generation on the DAQCard 1200 Notice that the EXTUPDATE signal is level sensitive that is if you perform writes to the DAC when EXTUPDATE is low the DAC is updated immediately Also notice that when EXTUPDATE is low the signal is susceptible to noise caused by switching of other lines Because the signal is TTL compatible the lower noise margin for logical 0 can result in transitions to a logical 1 due to noise and thereby generate false interrupts Therefore the width of EXTUPDATE pulse should be as short as possible but greater than 50 ns DAQCard 1200 User Manual 3 26 ni com Chapter 3 Connecting the Signals 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 counter interrupt signal interrupts the computer This interrupt is generated on the rising edge of EXTUPDATE The DACWRT signal writes a new value to the DAC EXTUPDATE DAC OUTPUT UPDATE Counter Interrupt DACWRT 4 1 50nsmn bg E o o E F 2 Figure 3 17 E
54. evelopers ready to share their own techniques Customer Education NI provides a number of alternatives to satisfy your training needs from self paced tutorials videos and interactive CDs to instructor led hands on courses at locations around the world Visit the Customer Education section of ni com for online course schedules syllabi training centers and class registration System Integration If you have time constraints limited in house technical resources or other dilemmas you may prefer to employ consulting or system integration services You can rely on the expertise available through our worldwide network of Alliance Program members To find out more about our Alliance system integration solutions visit the System Integration section of ni com National Instruments Corporation D 1 DAQCard 1200 User Manual Appendix D Technical Support Resources Worldwide Support NI has offices located around the world to help address your support needs You can access our branch office Web sites from the Worldwide Offices section of ni com Branch office Web sites provide up to date contact information support phone numbers e mail addresses and current events If you have searched the technical support resources on our Web site and still cannot find the answers you need contact your local office or NI corporate Phone numbers for our worldwide offices are listed at the front of this manual DAQCard 1200 User Manual D
55. figuration analog I O settings table 2 3 default settings 2 3 input modes 2 4 input polarity 2 4 data acquisition rates maximum recommended rates table 4 9 settling time versus gain table 4 9 data acquisition timing continuous data acquisition 4 8 data acquisition operation 4 8 interval data acquisition 4 8 National Instruments Corporation polarity configuration 2 4 settings table 2 3 specifications amplifier characteristics A 2 dynamic characteristics A 3 input characteristics A 1 stability A 4 transfer characteristics A 2 theory of operation 4 5 analog input modes configurations differential connection considerations 3 7 floating signal sources 3 8 ground referenced signal sources 3 10 recommended input configurations table 3 7 DIFF definition table 2 4 purpose and use 2 4 NRSE definition table 2 4 purpose and use 2 5 RSE definition table 2 4 purpose and use 2 5 analog input signal connections bipolar and unipolar signal range versus gain table 3 5 common mode signal rejection 3 13 differential connections description 3 7 floating signal sources 3 8 grounded signal sources 3 10 single ended connections 3 11 when to use 3 8 l 1 DAQCard 1200 User Manual Index exceeding maximum input voltage ratings caution 3 4 floating signal sources 3 6 ground referenced signal sources 3 6 input configurations 3 7 instrumentation amplifier 3 5 pins 3 3 recomme
56. for port B PB7 is the MSB and PBO 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 PCO is the LSB 38 EXTTRIG DI DGND External Trigger External control signal to trigger a DAQ operation 39 EXTUPDATE DI DGND External Update External control signal to update DAC outputs 40 EXTCONV DIO DGND External Convert External control signal to time A D conversions DI and drive SCANCLK when you use SCXI DO 41 OUTBO DO DGND Output BO Voltage output signal of counter BO 42 GATBO DI DGND Gate BO External control signal for gating counter BO 43 OUTBI DIO DGND Output B1 Voltage output signal of counter B1 when selected as output DO This is the external control signal for timing an interval cycle when selected as input DI National Instruments Corporation 3 3 DAQCard 1200 User Manual Chapter 3 Connecting the Signals Table 3 1 Signal Descriptions Continued Pins Signal Name Direction Reference Description 44 GATBI DI DGND Gate B1 External control signal for gating counter B1 45 CLKBI DI DGND Clock B 1 External control clock signal for counter B1 46 OUTB2 DO DGND Counter B2 Voltage 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 45V DO DGND 5 Volts
57. ge on OUTBI The first rising edge of EXTCONV after the rising edge of OUTBI enables an internal GATE signal that allows conversions to occur The first conversion then occurs on the following falling edge of EXTCONV Instead of using counter B1 you can externally time the scan interval through OUTB 1 If you externally time the sample interval you should also externally time the scan interval National Instruments Corporation 3 25 DAQCard 1200 User Manual Chapter 3 Connecting the Signals OUTB1 ja ty 50 ns vi lt u 50s mer uc cu cu uu uu X Ww CONVERT A A A A GATE ADC CH CH1 CHo CH1 CHO Y Figure 3 16 Interval Scanning Signal Timing Analog Output Timing Connections Counter A2 is used to internally control updating the output voltage of the 12 bit DACs In place of counter A2 you can use the final external control signal EXTUPDATE to externally control updating the output voltage of the 12 bit DACs and or to generate an externally timed interrupt There are two update modes immediate update and delayed update In immediate update mode the analog output is updated as soon as a value is written to the DAC If you select the delayed update mode a value is written to the DAC however the corresponding DAC voltage is not updated until a low level on the EXTUPDATE signal or counter A2 is sensed Furthermore an interrupt is generated whenever a rising edge is d
58. gnal pins DIO on the DAQCard 1200 uses the 82C55A integrated circuit The 82C55A is a general purpose peripheral interface containing 24 programmable I O pins These pins represent the three 8 bit ports PA PB and PC of the 82C55A Pins 14 through 21 are connected to the digital lines PA lt 0 7 gt for DIO port A Pins 22 through 29 are connected to the digital lines PB lt 0 7 gt for DIO port B Pins 30 through 37 are connected to the digital lines PC lt 0 7 gt for DIO port C Pin 13 DGND is the digital ground pin for all three DIO ports Refer to Appendix A Specifications for signal voltage and current specifications National Instruments Corporation 3 15 DAQCard 1200 User Manual Chapter 3 Connecting the Signals Figure 3 8 illustrates signal connections for three typical DIO applications Port C PC lt 0 7 gt o 22 PBO Port B TTL Sigra PB lt 0 7 gt 45V M NV ge PB7 Y are 45V LED A V DGND Port A Aes PA lt 0 7 gt _ ANN o 30 PAO 1 0 Connector DAQCard 1200 Figure 3 8 Digital 1 0 Connections In Figure 3 8 port A is configured for digital output and ports B and C are configured for digital input Digital input applications include receiving TTL signals and sensing external device states such as the switch in Figure 3 8 Digital output applications include sending TTL signals and driving external
59. he locations where FCC Class A products can be operated FCC Class B products display either a FCC ID code starting with the letters EXN Trade Name Model Number or the FCC Class B compliance mark that appears as shown here on the right FE Tested to Comply with FCC Standards Consult the FCC Web site at fcc gov for more information FCC DOC Warnings This equipment generates and uses radio frequency energy and if not installed and used in strict accordance with the instructions in this manual and the CE Mark Declaration of Conformity may cause interference to radio and television reception Classification requirements are the same for the FCC and the DOC FOR HOME OR OFFICE USE Changes or modifications not expressly approved by National Instruments could void the user s authority to operate the equipment under the FCC Rules Class A Federal Communications Commission This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference
60. he scan interval timing In the posttrigger mode EXTTRIG serves as an external trigger that initiates a DAQ sequence When you use counter A0 to time sample intervals a rising edge on EXTTRIG starts counter AO and the DAQ sequence When you use EXTCONV to time sample intervals data acquisition is enabled on a rising edge of EXTTRIG followed by a rising edge on EXTCONV The first conversion occurs on the next falling edge of EXTCONV Further transitions on the EXTTRIG line have no effect until a new DAQ sequence is established Figure 3 14 shows a possible timed 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 National Instruments Corporation 3 23 DAQCard 1200 User Manual Chapter 3 Connecting the Signals EXTTRIG EXTCONV CONVERT Vin Vit ty 50 ns minimum LLL eae t seme ty 50 ns minimum gt ig m First posttrigger sample Pues Iv n AUAM L1 T T DAQCard 1200 User Manual Figure 3 14 Posttrigger DAQ Timing In the pretrigger mode EXTTRIG serves as a stop trigger signal Data is acquired both before and after the stop trigger occurs A D conversions are software enabled which initiates the DAQ operation However the sample counter is not started until a rising edge is sense
61. he values that were written to the CalDACs to achieve calibration in the factory are stored in the onboard nonvolatile memory EEPROM Because the CalDACs have no memory capability they do not retain calibration information when the device is powered down Loading calibration constants refers to the process of loading the CalDACs with the values stored in the EEPROM NI DAQ determines when this is necessary and does it automatically The EEPROM has a user modifiable calibration area in addition to the permanent factory calibration area Hence you can load the CalDACs with values either from the original factory calibration or from a calibration that you subsequently performed National Instruments Corporation 5 1 DAQCard 1200 User Manual Chapter 5 Calibration This method of calibration is not very accurate because it does not take into account the fact that the device measurement and output voltage errors can vary with time and temperature Self calibrate the device when it is installed in the environment in which it is used Self Calibration The DAQCard 1200 can measure and correct for almost all of its calibration related errors without any external signal connections NI DAQ provides a self calibration function This self calibration process which generally takes less than two minutes is the preferred method of assuring accuracy in your application Initiate self calibration to minimize the effects of any offset and gain drif
62. heory of Operation For an example of a multiple channel interval DAQ operation refer to the description of interval scanning signal timing in the Analog Input Timing Connections section of Chapter 3 Connecting the Signals Data Acquisition Rates Maximum DAQ rates number of samples per second are determined by the conversion period of the ADC plus the sample and hold acquisition time During multiple channel scanning the 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 settle to the new input signal value to within 12 bit accuracy before you perform an A D conversion or 12 bit accuracy is not achieved The settling time is a function of the selected gain Table 4 1 shows the recommended settling time for each gain setting during multiple channel scanning Table 4 2 shows the maximum recommended acquisition rates For single channel scanning this rate is limited by the ADC conversion period plus the sample and hold acquisition time which is specified at 10 us 11 us if EXTCONV is used Table 4 1 Analog Input Settling Time Versus Gain Gain Setting Settling Time Recommended 1 2 5 10 10 us max 20 12 us typ 15 us max 50 25 us typ 30 us max 100 60 us typ 80 us max Table 4 2 DAQCard 1200 Maximum Recommended Data Acquisition Rates Sampling Acquisiti
63. iconductor G 2 ni com CMRR D A DAC DAQ DATA dB DC DGND DI DIFF DIN DIO DMA DNL Glossary common mode rejection ratio a measure of an instrument s ability to reject interference from a common mode signal usually expressed in decibels dB digital to analog digital to analog converter data acquisition 1 collecting and measuring electrical signals from sensors transducers and test probes or fixtures and inputting them to a computer for processing 2 collecting and measuring the same kinds of electrical signals with A D and or DIO devices plugged into a computer and possibly generating control signals with D A and or DIO devices in the same computer Data Lines at the Specified Port the signal that indicates when teh data on the data lines at a specified port is or should be available decibel direct current digital ground signal digital input differential input mode digital input signal digital input output direct memory access a method by which data can be transferred to from computer memory from to a device or memory on the bus while the processor does something else DMA is the fastest method of transferring data to from computer memory differential nonlinearity a measure in least significant bit of the worst case deviation of code widths from their ideal value of 1 LSB National Instruments Corporation G 3 DAQCard 1200 User Manual Glossary DO DOUT E EEPROM EISA
64. in interchannel delay INTR ISA National Instruments Corporation G 5 Glossary The factor by which a signal is amplified often expressed in dB gate input signal an unwanted momentary deviation from a desired signal hexadecimal hertz the number of scans read or updates written per second input output the transfer of data to from a computer system involving communications channels operator interface devices and or data acquisition and control interfaces Input Buffer Full A high signal on this handshaking line indicates that data has been loaded into the input latch primarily an input acknowledge signal inches another name for the sample interval the time between when the first channel in the scan is sampled and when that channel is sampled again Interrupt Request a signal that becomes high when the 82C55A requests service during a data transfer Industry Standard Architecture the prefix denoting 1 024 or 2 DAQCard 1200 User Manual Glossary LED LSB MAX MB MSB NC NI NI DAQ NRSE OBF OUT DAQCard 1200 User Manual light emitting diode least significant bit Measurement and Automation Explorer National Instruments software that allows you to interface with and configure NI devices megabytes of memory most significant bit not connected signal National Instruments National Instruments driver software for DAQ hardware nonreferenced single ended mode
65. ion Potentiometers Software Software DMA Uses DMA Cannot use DMA Cannot use DMA Waveform generation Can do waveform Cando waveform Should do either generation on one generationonone immediate update on both DAC and DAC and or waveform generation immediate updates immediate on both but not a on the other DAC updates on the combination Refer to other Chapter 4 Theory of Operation for more information FIFO size 512 samples 1 024 samples 1 024 samples Maximum single channel 83 3 kS s 100 kS s 100 kS s acquisition rate Power management modes 150 mA operating 50 mA power down mode Fuse Regular 250 mA Regular 250 mA Thermal 1 0 A DAQCard 1200 User Manual B 2 ni com Common Questions This appendix contains a list of common questions and answers relating to the operation of the DAQCard 1200 The questions are grouped according to the type of information requested Installing and Configuring the DAQCard 1200 Which NI documentation should I read first to get started using DAQ software Refer to the Configuring the DAQCard 1200 section in Chapter 2 Installing and Configuring the DAQCard 1200 for this information What version of NI DAQ must I have to program the DAQCard 1200 The DAQCard 1200 is supported by NI DAQ for Windows versions 6 9 x and earlier You may also the DAQCard 1200 with NI DAQ for Mac OS version 6 6 x or version 4 9 4 or earlier What is the best way
66. ional Instruments Corporation All rights reserved Important Information Warranty The DAQCard 1200 is warranted against defects in materials and workmanship for a period of one year from the date of shipment as evidenced by receipts or other documentation 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 document is accurate The document has been carefully reviewed for technical accuracy In the event that tech
67. irectly connected to the low voltage installation This category refers to local level distribution such as that provided by a standard wall outlet Examples of installation category II are measurements on household appliances portable tools and similar equipment Installation category III is for measurements performed in the building installation This category is a distribution level referring to hardwired equipment that does not rely on standard building insulation Examples of installation category III include measurements on distribution circuits and circuit breakers Other examples of installation category III are wiring including cables bus bars junction boxes switches socket outlets in the building fixed installation and equipment for industrial use such as stationary motors with a permanent connection to the building fixed installation MAINS is defined as the electricity supply system to which the equipment concerned is designed to be connected either for powering the equipment or for measurement purposes DAQCard 1200 User Manual 1 6 ni com Chapter 1 Introduction Installation category IV is for measurements performed at the source of the low voltage 1 000 V installation Examples of category IV are electric meters and measurements on primary overcurrent protection devices and ripple control units Below is a diagram of a sample installation Category IV Category Ill Category II Category
68. it applications not involving averaging dither should be disabled because it only adds noise When taking DC measurements such as when calibrating the DAQCard 1200 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 The DAQCard 1200 uses a 12 bit successive approximation ADC The 12 bit resolution of the converter allows the converter to resolve its input range into 4 096 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 This FIFO serves as a buffer to the ADC The A D FIFO can collect up to 1 024 A D conversion values before any information is lost thus allowing software some extra time to catch up with the hardware If you store more than 1 024 samples in the A D FIFO before reading from the A D FIFO 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 format depending on which input mode you select unipolar or bipolar In unipolar mode the data from the ADC is interpreted as a 12 bit straight binary number with a
69. its of the input instrumentation amplifier Differential Connections for Floating Signal Sources Figure 3 3 shows how to connect a floating signal source to a DAQCard 1200 that is configured for DIFF input mode Configuration instructions are included in the Configuring Analog Input section of Chapter 2 Installing and Configuring the DAQCard 1200 3 8 ni com Chapter 3 Connecting the Signals Floating Signal Source Current Return Q 100 kQ i Bias Paths Front I O 1 ACHO O26 3 ACH2 5 ACH4 so 7 ACH6 5 4 T 2 ACH 1 V Measured Voltage o 4 ACH3 So 6 ACH5 Xo 5 8 ACH7 so 100 kQ i 11 AGND Connector DAQCard 1200 in DIFF Configuration Figure 3 3 Differential Input Connections for Floating Sources The 100 KQ resistors shown in Figure 3 3 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 cause stray capacitances resulting in uncontrollable drift and possible saturation in the amplifier A resistor from each input to ground as shown in Figure 3 3 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
70. le 3 18 Developer Zone E 1 DGND signal table 3 3 3 4 diagnostic resources E 1 DIFF input configuration 2 4 definition table 2 4 recommended input configurations table 3 7 differential connections description 3 7 DIFF configuration considerations 3 7 floating signal sources 3 8 ground referenced signal sources 3 10 when to use 3 8 digital I O circuitry 4 12 configuration 2 6 specifications A 5 digital I O signal connections illustration 3 16 pins 3 15 port C pin connections 3 17 timing specifications 3 18 mode input timing 3 19 mode output timing 3 20 mode 2 bidirectional timing 3 20 DAQCard 1200 User Manual Index dynamic characteristics analog input specifications A 3 analog output specifications A 5 E EEPROM storage of calibration data 5 1 equipment optional 1 4 event counting application 3 28 with external switch gating figure 3 28 EXTCONV signal description table 3 3 maximum voltage input rating 3 27 timing connections 3 23 EXTTRIG signal data acquisition timing 3 23 description table 3 3 maximum voltage input rating 3 27 EXTUPDATE signal data acquisition timing 3 26 description table 3 3 maximum voltage input rating 3 27 updating DAC output figure 3 27 F floating signal sources differential connections 3 8 purpose and use 3 6 single ended connections RSE configuration 3 11 frequency measurement 3 29 general purpose timing signal con
71. m signal ratings on the DAQCard 1200 can damage the card and computer NI is not liable for any injuries or damage resulting from incorrect signal connections National Instruments Corporation 2 3 DAQCard 1200 User Manual Chapter 2 Installing and Configuring the DAQCard 1200 Analog Input Polarity You can configure the AI setting on the DAQCard 1200 for either a unipolar range 0 to 10 V or a bipolar range 5 to 5 V If you select a bipolar range the two s complement coding mode is selected In this mode 5 V input corresponds to F800 hex 2 048 decimal and 5 V corresponds to 7FF hex 2 047 decimal If you select a unipolar mode the straight binary coding is selected In this mode 0 V input corresponds to 0 hex and 10 V corresponds to FFF hex 4 095 decimal Analog Input Mode The DAQCard 1200 has three input modes RSE NRSE and DIFF The single ended modes RSE and NRSE provide eight input channels DIFF input mode provides four input channels Table 2 2 describes these modes Table 2 2 Analog Input Modes for the DAQCard 1200 Analog Input Modes Description 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 pairing channels 0 1 2 3 4 5 6 7 RSE RSE mode provides eight single ended inputs with the negative input of
72. ments for I O connector figure 3 2 polarity analog input 2 4 analog output 2 6 bipolar and unipolar signal range versus gain table 3 5 port C signal assignments table 3 17 posttrigger mode 3 23 power connections 3 31 power requirement specifications A 7 power on state 4 11 pretrigger mode 3 24 pulse generation 3 28 pulsewidth measurement 3 29 R RD signal table 3 18 referenced single ended mode See RSE input requirements for getting started 1 2 RSE input configuration 2 5 definition table 2 4 recommended input configurations table 3 7 single ended connections for floating signal sources 3 11 S sample counter 3 22 sample interval counter 3 22 sampling rate note 4 10 signal connections analog input signal connections bipolar and unipolar signal range versus gain table 3 5 common mode signal rejection 3 13 DAQCard 1200 User Manual differential connections floating signal sources 3 8 grounded signal sources 3 10 single ended connections 3 11 when to use 3 8 exceeding maximum input voltage ratings caution 3 4 floating signal sources 3 6 ground referenced signal sources 3 6 input configurations 3 7 instrumentation amplifier 3 5 pins 3 4 recommended input configurations table 3 7 single ended connections floating signal sources RSE configuration 3 11 grounded signal sources NRSE configuration 3 12 when to use 3 11 types
73. mes high when the 82C55A requests service during a data transfer Set the appropriate interrupt enable signals to generate this signal RD Internal Read This signal is the read signal generated from the parallel port interface circuitry WRT Internal Write This signal is the write signal generated from the parallel port interface circuitry DATA Bidirectional Data Lines at the Specified Port This signal indicates when the data on the data lines at a specified port is or should be available DAQCard 1200 User Manual 3 18 ni com Mode 1 Input Timing Figure 3 9 shows the timing specifications for an input transfer in mode 1 Chapter 3 Connecting the Signals T1 T2 T4 STB T7 Ii IBF T6 INTR RD DATA Name Description Minimum Maximum Tl STB pulse width 100 T2 STB 0 to IBF 1 150 T3 Data before STB 2 1 20 T4 STB 1 to INTR 1 150 T5 Data after STB 1 50 T6 RD 0 to INTR 0 200 T7 RD 1 to IBF 0 150 AII timing values are in nanoseconds Figure 3 9 Mode 1 Timing Specifications for Input Transfers National Instruments Corporation DAQCard 1200 User Manual Chapter 3 Connecting the Signals Mode 1 Output Timing Figure 3 10 shows the timing specifications for an output transfer in
74. nal Instruments Corporation Figure 4 1 DAQCard 1200 Block Diagram 4 1 DAQCard 1200 User Manual Chapter 4 Theory of Operation The major components of the DAQCard 1200 are as follows e PC Card I O channel interface circuitry e Al circuitry e AO circuitry e DIO circuitry Timing circuitry e Calibration circuitry The internal data and control buses interconnect the components The rest of the chapter explains the theory of operation of each of the DAQCard 1200 components PC Card 1 0 Channel Interface Circuitry The DAQCard 1200 PC Card I O channel interface circuitry is shown in Figure 4 2 and consists of an address bus a data bus interrupt lines and several control and support signals Address Bus Control Lines Data Bus PCMCIA I O Channel IRQ H Address Register Selects Decoder Timing Interface amp Read and Write Signals Card Information Data Buffers amp Internal Data Bus PCMCIA Control Interrupt Control Interrupt Requests DAQCard 1200 User Manual Figure 4 2 PC Card 1 0 Interface Circuitry Block Diagram 4 2 ni com Timing Chapter 4 Theory of Operation When you first insert the card into the computer the system examines information stored in the DAQCard 1200 Card Information Structure CIS This data is used to configure the card appropriately for the system in which it is used When the system h
75. nded input configurations table 3 7 single ended connections floating signal sources RSE configuration 3 11 grounded signal sources NRSE configuration 3 12 purpose and use 3 11 when to use 3 11 types of signal sources 3 6 analog output circuitry 4 10 DAC timing 4 11 polarity configuration 2 6 settings table 2 5 power on state 4 11 signal connections 3 14 specifications dynamic characteristics A 5 output characteristics A 4 stability A 5 transfer characteristics A 4 voltage output A 5 theory of operation 4 10 bus interface specifications A 7 DAQCard 1200 User Manual l 2 C calibration EEPROM storage 5 1 loading calibration constants 5 1 overview 5 1 CLK signals general purpose timing signal connections 3 27 timing requirements signals figure 3 31 CLKBI signal table 3 4 CLKB2 signal table 3 4 common mode signal rejection considerations 3 13 configuration analog input analog I O settings table 2 3 default settings 2 3 exceeding maximum ratings caution 2 3 input modes 2 4 input polarity 2 4 analog output polarity 2 6 counter timers 2 6 digital I O 2 6 PC Card C 1 typical configuration figure 2 2 contacting National Instruments E 2 conventions used in the manual xi Counter 0 on 82C53 A counter timer 3 22 Counter 1 on 82C53 A counter timer 3 22 counter timers configuration 2 6 theory of operation 4 3 customer education E 1 technical support E 1
76. nections 3 29 frequently asked questions E 1 G GATBO signal table 3 3 GATBI signal table 3 4 GATB2 signal table 3 4 DAQCard 1200 User Manual l 4 GATE signals general purpose timing signal connections 3 27 timing requirements signals figure 3 31 general purpose timing signal connections See also data acquisition timing connections event counting 3 28 frequency measurement 3 29 GATE CLK and OUT signals 3 27 pins 3 22 pulse generation 3 28 pulsewidth measurement 3 29 square wave generation 3 28 time lapse measurement 3 29 timing requirements for GATE CLK and OUT signals figure 3 31 ground referenced signal sources differential connections 3 10 purpose and use 3 6 recommended input configurations table 3 7 single ended connections NRSE configuration 3 12 H help technical support E 1 I O connector exceeding maximum ratings caution 3 1 pin assignments figure 3 2 IBF signal table 3 18 input configurations differential connection considerations 3 7 ni com floating signal sources differential connections 3 8 recommended input configurations table 3 7 ground referenced signal sources differential connections 3 10 recommended input configurations table 3 7 installation DAQCard 1200 2 1 instrumentation amplifier 3 5 interval scanning data acquisition multiple channel interval scanning figure 3 25 INTR signal table 3 18 L Lab PC compared with
77. ng Circuitry DAQCard 1200 User Manual 4 4 ni com Analog Input Chapter 4 Theory of Operation 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 three counter timers to operate in several useful timing modes The first group of counter timers is called Group A and includes AO A1 and A2 You can use these three counters for internal DAQ and DAC timing or you can instead use the three external timing signals EXTCONV EXTTRIG and EXTUPDATE for DAQ and DAC timing The second group of counter timers is called Group B and includes BO B1 and B2 You can use counters BO and B1 for internal DAQ and DAC timing or you can use the external timing signal CLKB1 for AI timing If you are not using Counters BO and B1 for internal timing you can use these counters as general purpose counter timers Counter B2 is reserved for external use as a general purpose counter timer For a more detailed description of Counter Group A and Counters BO and B1 refer to the following Analog Input and Analog Output sections The DAQCard 1200 has eight AI channels with software programmable gain and 12 bit A D conversion The DAQCard 1200 also contains DAQ timing circuitry for automatic timing of multiple A D conversions and includes advanced options such as external triggering gating and clocking Figure 4 4 shows a block di
78. nical or typographical errors exist National Instruments reserves the right to make changes to subsequent editions of this document without prior notice to holders of this edition The reader should consult National Instruments if errors are suspected In no event shall National Instruments be liable for any damages arising out of or related to this document or the information contained in it EXCEPT AS SPECIFIED HEREIN NATIONAL INSTRUMENTS MAKES NO WARRANTIES EXPRESS OR IMPLIED AND SPECIFICALLY DISCLAIMS ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE CUSTOMER S RIGHT TO RECOVER DAMAGES CAUSED BY FAULT OR NEGLIGENCE ON THE PART OF NATIONAL INSTRUMENTS SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER NATIONAL INSTRUMENTS WILL NOT BE LIABLE FOR DAMAGES RESULTING FROM LOSS OF DATA PROFITS USE OF PRODUCTS OR INCIDENTAL OR CONSEQUENTIAL DAMAGES EVEN IF ADVISED OF THE POSSIBILITY THEREOF This limitation of the liability of National Instruments will apply regardless of the form of action whether in contract or tort including negligence Any action against National Instruments must be brought within one year after the cause of action accrues National Instruments shall not be liable for any delay in performance due to causes beyond its reasonable control The warranty provided herein does not cover damages defects malfunctions or service failures caused by owner s failure to follow the National Instruments installation
79. nt drive Protection Power on state 0 to 110 ms 2110 sive enan Dynamic Characteristics Settling time to full scale step Stability Offset temperature coefficient Gain temperature coefficient Digital 1 0 Number of channels Compatibility Power on state National Instruments Corporation A 5 Appendix A Specifications 0 to 10 V 5 V software selectable DC 0 5 O typ mA max per channel 80 mA momentary short circuit protection to ground 42 V to 5 V 0 V mV 20 us to x1 LSB accuracy 400 LVims typ DC to 1 MHz 50 uV C 30 ppm C 24 I O three 8 bit ports uses the 82C55A PPI TTL All ports high impedance inputs DAQCard 1200 User Manual Appendix A Timing 1 0 DAQCard 1200 User Manual Specifications Digital logic levels Level Min Max Input low voltage 0 3 V 0 8 V Input high voltage 2 2V 5 3 V Output low voltage out 2 5 mA 0 4 V Output high voltage out 40 WA 4 2V lout 2 5 mA 3 7 V Output leakage current 0 lt Vout S Vec 10 uA 10 uA Prot ectionuacnn ainaani Handshaking Data transfers Number of channels Digital logic levels 0 5 to 5 5 V powered on 0 5 V powered off 3 wire 2 port Interrupts programmed I O 3 counters timers Level Min Max Input low voltage 0 3 V 0
80. o 6 V in bipolar mode and National Instruments Corporation 3 13 DAQCard 1200 User Manual Chapter 3 Connecting the Signals 6 to 2 V in unipolar mode V should remain within a range of 6 to 11 V in either mode Connecting Analog Output Signals DAQCard 1200 User Manual Pins 10 through 12 of the front connector are the AO signals DACOOUT AGND and DACIOUT DACOOUT is the voltage output signal for AO channel 0 DAC1OUT is the voltage output signal for AO channel 1 AGND is the ground reference point for both AO channels and analog input The following output ranges are available and for each output range the maximum load current is 1 mA for 12 bit linearity per DAC e Output signal range Bipolar output 5 V Unipolar output O to 10 V Figure 3 7 shows how to make AO signal connections 10 DACOOUT rum Load Vout 0 i 11 AGND i VW Load Vout 1 tlo 12 DAC1OUT Chanel Analog Output Channels Front I O Connector DAQCard 1200 Figure 3 7 Analog Output Signal Connections 3 14 ni com Chapter 3 Connecting the Signals Connecting Digital 1 0 Signals UN Caution The DAQCard 1200 DIO lines are not pulled up or pulled down If you are using these lines as digital outputs add 10 kQ resistors to 5 V or DGND depending on your application to the DIO line s you are using Pins 13 through 37 of the front connector are DIO si
81. odes for both types of signal sources Table 3 3 Recommended Input Modes for Ground Referenced and Floating Signal Sources Recommended Input Type of Signal Configuration Ground Referenced DIFF nonisolated outputs plug in instruments NRSE Floating DIFF with bias resistors batteries thermocouples isolated outputs RSE Differential Connection Considerations DIFF Input Mode Differential connections are those in which each DAQCard 1200 AI signal has its own reference signal or signal return path These connections are available when you configure the DAQCard 1200 in the DIFF input 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 National Instruments Corporation 3 7 DAQCard 1200 User Manual Chapter 3 Connecting the Signals DAQCard 1200 User Manual You should use the DIFF input configuration when any of the following conditions are present e Input signals are low level less than 1 V Leads connecting signals to the DAQCard 1200 are greater than 15 ft Any input signal requires a separate ground reference point or return signal e The signal leads travel through noisy environments Differential signal connections reduce noise pickup noise and increase common mode noise rejection With these connections input signals can float within the common mode lim
82. ollution occurs The pollution has no influence e Pollution degree 2 means that only nonconductive pollution occurs in most cases Occasionally however a temporary conductivity caused by condensation must be expected National Instruments Corporation 1 5 DAQCard 1200 User Manual Chapter 1 Introduction Pollution degree 3 means that conductive pollution occurs or dry nonconductive pollution occurs that becomes conductive due to condensation Clean the product with a soft nonmetallic brush Make sure that the product is completely dry and free from contaminants before returning it to service You must insulate signal connections for the maximum voltage for which the product is rated Do not exceed the maximum ratings for the product Remove power from signal lines before connecting them to or disconnecting them from the product Operate this product only at or below the installation category stated in Appendix A Specifications The following is a description of installation categories Installation category I is for measurements performed on circuits not directly connected to MAINS This category is a signal level such as voltages on a printed wire board PWB on the secondary of an isolation transformer Examples of installation category I are measurements on circuits not derived from MAINS and specially protected internal MAINS derived circuits Installation category II is for measurements performed on circuits d
83. on The GATE CLK and OUT signals for counters B1 and B2 are available at the I O front connector The GATE and CLK pins are internally pulled up to 5 V through a 100 kQ resistor Refer to Appendix A Specifications for signal voltage and current specifications You perform pulse and square wave generation by programming a counter to generate a timing signal at its OUT output pin Perform event counting by programming a counter to count rising or falling edges applied to any of the 82C53 CLK inputs You can then read the counter value to determine the number of edges that have occurred You can gate counter operations on and off during event counting Figure 3 18 shows connections for a typical event counting operation in which a switch is used to gate the counter on and off 5V PL i CLK OUT 6 o o hd GATE Sianal Switch Source Counter from Group B 1 0 Connector DAQCard 1200 Figure 3 18 Event Counting Application with External Switch Gating DAQCard 1200 User Manual 3 28 ni com Chapter 3 Connecting the Signals Pulsewidth measurement is performed by level gating The pulse you want to measure is applied to the counter GATE input The counter is loaded with the known count and is programmed to count down while the signal at the GATE input is high The pulse width equals the counter difference loaded value minus read value multiplied by the CLK period Perf
84. on Mode Gain Setting Rate Single channel 1 2 5 10 20 50 100 100 kS s Multiple channel 1 2 5 10 100 kS s observe these settings 2 k to ensure 12 bit 9 SHOES accuracy 50 40 0 kS s 100 16 6 kS s National Instruments Corporation 4 9 DAQCard 1200 User Manual Chapter 4 Theory of Operation The recommended 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 iyi Note If you use external conversions for single channel acquisitions the maximum sampling rate is 90 kS s Analog Output The DAQCard 1200 has two channels of 12 bit D A output Each AO channel can provide unipolar or bipolar output The DAQCard 1200 also contains timing circuitry for waveform generation timed either externally or internally Figure 4 5 shows the AO circuitry Two s Complement P DACOWRT DACOOUT DACO i TA m 8 AGND Bg 8 5 V Internal 4 uud EXTUPDATE 2 External Update Reference o o b DAC1WRT DAC1OUT DAC1 a lt q Two s Complement Dual DAC Chip Decode Circuitry Control Signal Data ra 8 PCMCIA Interface PCMCIA I O Channel Interface Figure 4 5 Analog Output Circuitry Analog Output Circuitry
85. onnector 4 t DATA lt 0 7 gt i Data zm Decode A pio RbwRr Circuitry 82C55A E Programmable e g Peripheral o e Interface g x 2 x Oo t z JE x O t gt O CO To P x Interrupt PC3 Control Ewa DAGQCard 1200 User Manual Figure 4 6 Digital l O Circuitry All three ports on the 82C55A are TTL compatible When enabled the digital output ports are capable of sinking 2 4 mA of current and sourcing 2 6 mA of current on each DIO line When the ports are not enabled the DIO lines act as high impedance inputs 4 12 ni com Calibration This chapter discusses calibrating the DAQCard 1200 NI DAQ includes calibration functions for performing all the steps in the calibration process Calibration refers to the process of minimizing measurement and output voltage errors by making small circuit adjustments On the DAQCard 1200 these adjustments take the form of writing values to onboard calibration DACs CalDACs Some form of device calibration is required for most applications If you do not calibrate your device your signals and measurements could have very large offset gain and linearity errors Loading Calibration Constants The DAQCard 1200 device is factory calibrated at approximately 25 C to the levels indicated in Appendix A Specifications The associated calibration constants t
86. 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 CVI DAQCard DAQPad LabVIEW Measurement Studio National Instruments NI ni com and NI DAQ are trademarks of National Instruments Corporation Product and company names mentioned herein are trademarks or trade names of their respective companies Patents For patents covering National Instruments products refer to the appropriate location Help Patents in your software the patents txt file on your CD or ni com patents WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS 1 NATIONAL INSTRUMENTS PRODUCTS ARE NOT DESIGNED WITH COMPONENTS AND TESTING FOR A LEVEL OF RELIABILITY SUITABLE FOR USE IN OR IN CONNECTION WITH SURGICAL IMPLANTS OR AS CRITICAL COMPONENTS IN ANY LIFE SUPPORT SYSTEMS WHOSE FAILURE TO PERFORM CAN REASONABLY BE EXPECTED TO CAUSE SIGNIFICANT INJURY TO A HUMAN 2 IN ANY APPLICATION INCLUDING THE ABOVE RELIABILITY OF OPERATIO
87. oration 2 5 DAQCard 1200 User Manual Chapter 2 Installing and Configuring the DAQCard 1200 Analog Output Polarity The DAQCard 1200 has two channels of AO voltage at the front panel I O connector You can configure each AO channel for either unipolar or bipolar output A unipolar configuration has a range of 0 to 10 V at the analog output A bipolar configuration has a range of 5 to 5 V at the analog output If you select a bipolar range for a D A conversion the two s complement coding mode is selected In this mode data values written to the AO channel range from F800 hex 2 048 decimal to 7FF hex 2 047 decimal If you select a unipolar range you are selecting the straight binary coding In this mode data values written to the AO channel range from 0 to FFF hex 4 095 decimal Configuring Digital 1 0 The DAQCard 1200 uses the MSM82C55 programmable peripheral interface PPI This chip provides 24 digital lines in the form of three ports A B and C On power up all three ports reset to high impedance inputs For information about configuring the MSMS82C55 Refer to the Analog Input Timing Connections section of Chapter 3 Connecting the Signals Caution The DAQCard 1200 DIO lines are not pulled up or pulled down If you are using these lines as digital outputs add 10 kQ resistors to 5 V or DGND depending on your application to the DIO line s you are using Configuring Counters DAQCard 1200 User Manual You c
88. orm time lapse measurement by programming a counter to be edge gated An edge is applied to the counter GATE input to start the counter You can 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 you program the counter to count falling edges at the CLK input while the gate is applied The frequency of the input signal then equals the count value divided by the gate period Figure 3 19 shows the connections for a frequency measurement application You can also use a second counter to generate the gate signal in this application In this case program the second counter for a one slot mode This configuration requires an external inverter to make the output pulse of the second counter active high National Instruments Corporation 3 29 DAQCard 1200 User Manual Chapter 3 Connecting the Signals I O Connector 45V TLL m d O CLK OUT o e GATE Signal Gate Source Source Counter oO een 13 DGND W DAQCard 1200 DAQCard 1200 User Manual Figure 3 19 Freq
89. peration DAQ operations are initiated either externally through EXTTRIG or through software control The DAQ operation is terminated either internally by counter A1 of the 82C53A counter timer circuitry which counts the total number of samples taken during a finite operation or through software control in a continuous operation Round Robin Data Acquisition In a round robin DAQ operation samples are taken at regular sample intervals without any delays Therefore each sample is taken with the same sample interval This sample interval applies to both single channel and multiple channel data acquisition in either continuous or finite operation The sample interval is either controlled externally by EXTCONV or internally by counter AO of the timing circuitry Interval Data Acquisition In an interval DAQ operation a period called the scan interval is defined Within each scan interval a predefined number of samples is taken at regular intervals and conversions are stopped for the remainder of the interval cycle A DAQ operation consists of back to back interval cycles In single channel interval data acquisition you select the number of samples in each interval cycle from a single channel In multiple channel interval data acquisition the channels are scanned once during each interval cycle The scan interval timing can be externally controlled through OUTBI or internally by counter B1 of the timing circuitry 4 8 ni com Chapter 4 T
90. range of 0 to 4 095 In bipolar mode the data from the ADC is interpreted as a 12 bit two s complement number with a range of 2 048 to 2 047 In this mode the MSB of the ADC result is modified to make it two s complement The output from the ADC 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 National Instruments Corporation 4 7 DAQCard 1200 User Manual Chapter 4 Theory of Operation Data Acquisition Timing DAQCard 1200 User Manual A DAQ operation refers to the process of taking a sequence of A D conversions when the sample interval or the time between successive A D conversions is carefully timed A finite DAQ operation acquires a finite number of samples while a continuous DAQ operation acquires an infinite number of samples The DAQCard 1200 can perform both single channel data acquisition and multiple channel or scanned data acquisition in two modes round robin and interval The DAQ timing circuitry consists of various clocks and timing signals that control the DAQ operation DAQ timing consists of signals that initiate a DAQ operation time the individual A D conversions gate the DAQ operation and generate scan clocks The DAQ operation can either be timed by the timing circuitry or by externally generated signals These two modes are software configurable Data Acquisition O
91. rating Caution Exceeding the input signal range distorts input signals Exceeding the maximum input voltage rating may damage the DAQCard 1200 and the computer NI is not liable for damage resulting from such signal connections DAQCard 1200 User Manual 3 4 ni com Chapter 3 Connecting the Signals Table 3 2 Bipolar and Unipolar Analog Input Signal Range Versus Gain Input Signal Range Gain Setting Bipolar Unipolar 1 5 V 0to 10 V 2 z2 5 V 0to5 V 5 xl V 0to2 V 10 500 mV Otol V 20 250 mV 0 to 500 mV 50 100 mV 0 to 200 mV 100 50 mV 0 to 100 mV How you connect analog input signals to the DAQCard 1200 depends on how you configure the card analog input circuitry and the type of input signal source With different DAQCard 1200 input modes you can use the instrumentation amplifier in different ways Figure 3 2 shows a diagram of the DAQCard 1200 instrumentation amplifier Instrumentation Vig O Amplifier v Measured m Voltage L Vin Vin Vin GAIN Vin O Figure 3 2 DAQCard 1200 Instrumentation Amplifier National Instruments Corporation 3 5 DAQCard 1200 User Manual Chapter 3 Connecting the Signals DAQCard 1200 User Manual The instrumentation amplifier applies gain common mode voltage rejection and high input impedance to the AI signals connected to the DAQCard 1200 Signals are routed to the positive and negative
92. re documentation NI application software includes LabVIEW and Measurement Studio After you set up your hardware system use either your application software documentation or the NI DAQ documentation to help you write your application If you have a large complicated system it is worthwhile to look through the software documentation before you configure your hardware Accessory installation guides or manuals If you are using accessory products read the cable assembly installation guide It explains how to physically connect the relevant pieces of the system Consult this guide when you make the connections Xii ni com Introduction This chapter discusses what you need to get started optional software optional equipment how to unpack the DAQCard 1200 and safety information for using the device About the DAQCard 1200 The DAQCard 1200 is a low cost low power AI AO DIO and TIO card for computers equipped with a Type II PC Card slot The card contains a 12 bit successive approximation A D converter ADC with eight inputs which you can configure as eight single ended or four differential channels The DAQCard 1200 also has two 12 bit D A converters DACs with voltage outputs 24 lines of TTL compatible DIO and three 16 bit counter timer channels for TIO The specially designed standard 50 pin I O connector for the DAQCard 1200 enables you to connect all the analog digital and timing signals to the card The DAQCard 1200 is
93. ruments Corporation l 7 Index T technical support resources E 1 telephone technical support E 2 theory of operation analog input circuitry 4 6 data acquisition rates 4 9 data acquisition timing 4 8 analog output circuitry 4 10 DAC timing 4 11 power on state 4 11 block diagram of DAQCard 1200 4 1 digital I O 4 12 functional overview 4 1 PC card I O channel interface circuitry 4 2 timing 4 3 time lapse measurement 3 29 timing circuitry illustration 4 4 theory of operation 4 3 timing I O specifications A 6 timing signal connections See data acquisition timing connections general purpose timing signal conections timing specifications digital I O mode 1 input timing 3 19 mode 1 output timing 3 20 mode 2 bidirectional timing 3 20 training customer E 1 transfer characteristics analog input specifications A 2 analog output specifications A 4 troubleshooting resources E 1 DAQCard 1200 User Manual Index U unpacking the DAQCard 1200 1 5 V voltage output specifications A 5 DAQCard 1200 User Manual W Web support from National Instruments E 1 worldwide technical support E 2 WRIT signal table 3 18 ni com
94. s installation and operation The DAQCard 1200 is a compact low cost low power analog input AJ analog output AO digital I O DIO and timing I O TIO card for IBM PC XT PC AT and compatible computers that are equipped with a PCMCIA Type II PC Card socket lt gt gt g bold italic monospace The following conventions appear in this manual Angle brackets that contain numbers separated by an ellipsis represent a range of values associated with a bit or signal name for example DBIO lt 3 0 gt The symbol leads you through nested menu items and dialog box options to a final action The sequence File Page Setup Options directs you to pull down the File menu select the Page Setup item and select Options from the last dialog box This icon denotes a note which alerts you to important information This icon denotes a caution which advises you of precautions to take to avoid injury data loss or a system crash When this symbol is marked on the product refer to the Safety Information section of Chapter 1 Introduction for precautions to take Bold text denotes items that you must select or click on in the software such as menu items and dialog box options Bold text also denotes parameter names Italic text denotes variables emphasis a cross reference or an introduction to a key concept This font also denotes text that is a placeholder for a word or value that you must supply Text in thi
95. s font denotes text or characters that you should enter from the keyboard sections of code programming examples and syntax examples This font is also used for the proper names of disk drives paths directories programs subprograms subroutines device names functions operations variables filenames and extensions and code excerpts National Instruments Corporation Xi DAQCard 1200 User Manual About This Manual PC PC refers to all PC AT series computers with PCI or PXI bus unless otherwise noted PCMCIA PCMCIA is an international standards body and trade association that promotes the interoperability of PC cards Platform Text in this font denotes a specific platform and indicates that the text following it applies only to that platform National Instruments Documentation The DAQCard 1200 User Manual is one piece of the documentation set for the data acquisition DAQ system You could have any of several types of documentation depending on the hardware and software in your system Use the documentation you have as follows DAQCard 1200 User Manual Hardware documentation This documentation has detailed information about the DAQ hardware that plugs into or is connected to the computer Use this documentation for hardware installation and configuration instructions specification information about DAQ hardware and application hints Software documentation You may have both application software and NI DAQ softwa
96. seful for measuring floating signal sources Refer to the Types of Signal Sources section of Chapter 3 Connecting the Signals for more information With the RSE configuration the DAQCard 1200 can monitor eight different analog input channels Considerations for using the RSE mode are discussed in Chapter 3 Connecting the Signals Notice that in RSE mode the return path of the signal is through analog ground at the connector through the AISENSE AIGND pin NRSE Input Mode Eight Channels NRSE input mode means that all signals are referenced to the same common mode voltage which is allowed to float with respect to the analog ground of the DAQCard 1200 This common mode voltage is subsequently subtracted out by the instrumentation amplifier NRSE input mode is useful when measuring ground referenced signal sources Considerations for using the NRSE configuration are discussed in Chapter 3 Connecting the Signals Notice that in this mode the return path of the signal is through the negative terminal of the amplifier available at the connector through the pin AISENSE AIGND Configuring Analog Output You can set the analog output on the DAQCard 1200 to either bipolar or unipolar configurations Parameter Configuration Analog Output CHO Polarity Bipolar 5 V default setting Unipolar 0 10 V Analog Output CH1 Polarity Bipolar 5 V default setting Unipolar 0 10 V National Instruments Corp
97. st of functions supported by the DAQcCard 1200 If you are using NI DAQ 6 6 or earlier refer to Appendix C NI DAQ Function Support of the NI DAQ Function Reference Manual for PC Compatibles I wish to register level program the DAQCard 1200 Where can I find the information that I need to accomplish this task Register level programming is not recommended for most users Even experienced register level programmers will find that using the NI DAQ LabVIEW or Measurement Studio ADE is as easy and as flexible as register level programming and can save weeks of development time However if you choose to register level program you can download the DAQCard 1200 Register Level Programmer Manual from ni com manuals C 2 ni com Technical Support Resources Web Support NI Web support is your first stop for help in solving installation configuration and application problems and questions Online problem solving and diagnostic resources include frequently asked questions knowledge bases product specific troubleshooting wizards manuals drivers software updates and more Web support is available through the Technical Support section of ni com NI Developer Zone The NI Developer Zone at ni com zone is the essential resource for building measurement and automation systems At the NI Developer Zone you can easily access the latest example programs system configurators tutorials technical news as well as a community of d
98. ts particularly those due to warm up Immediately after self calibration the only significant residual calibration error could be gain error due to time or temperature drift of the onboard voltage reference This error is addressed by external calibration If you are interested primarily in relative measurements you can ignore a small amount of gain error and self calibration should be sufficient External Calibration DAQCard 1200 User Manual The DAQCard 1200 has an onboard calibration reference to ensure the accuracy of self calibration Its specifications are listed in Appendix A Specifications The reference voltage is measured at the factory and stored in the EEPROM for subsequent self calibrations This voltage is stable enough for most applications but if you use your device at an extreme temperature or if the onboard reference has not been measured for a year or more you may wish to externally calibrate your device An external calibration refers to calibrating your device with a known external reference rather than relying on the onboard reference Redetermining the value of the onboard reference is part of this process and the results can be saved in the EEPROM You can externally calibrate your device by calling the NI DAQ calibration function To externally calibrate your device be sure to use a very accurate external reference The reference should be 4 10 times more accurate than the device itself 5 2 ni com
99. ual Basic developers Measurement Studio features a set of ActiveX controls for using National Instruments DAQ hardware These ActiveX controls provide a high level programming interface for building virtual instruments For Visual C developers Measurement Studio offers a set of Visual C classes and tools to integrate those classes into Visual C applications The libraries ActiveX controls and classes are available with Measurement Studio and NI DAQ Using LabVIEW or Measurement Studio greatly reduces the development time for your data acquisition and control application Optional Equipment DAQCard 1200 User Manual NI offers a variety of products to use with the DAQCard 1200 including cables connector blocks and other accessories including the following items e BNC 2081 e CB 500or CB 50LP I O connector block with a 0 5 or 1 0 m cable ER 8 ER 16 electromechanical relays PR50 50F or PR50 50M cables e SC 2042 SC 2043 strain gauge and resistance temperature detector RTD accessories e SCXI products For more specific information about these products refer to ni com catalog or call the office nearest you 1 4 ni com Chapter 1 Introduction Unpacking The DAQCard 1200 is shipped in an antistatic package to prevent electrostatic damage to the device UN Caution Never touch the exposed pins of connectors Because the DAQCard 1200 is enclosed in a fully shielded case no additional electrostati
100. uency Measurement Application Figure 3 20 shows the timing requirements for the GATE and CLK input signals and the timing specifications for the OUT output signals of the 82C53 3 30 ni com Chapter 3 Connecting the Signals CLK GATE OUT IL town gt towl a a toutg gt 1 toute gt 4 Pd VoL teg clock period 380 ns min town clock high level 230 ns min tow clock low level 150 ns min tysu gate setup time 100 ns min tgh gate hold time 50 ns min tgwh gate high level 150 ns min tgwi gate low level 100 ns min toutg output delay from clock 300 ns max toute output delay from gate 400 ns max 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 Connecting the Power Pin 49 of the I O connector supplies 5 V from the DAQCard 1200 power supply This pin is referenced to DGND You can use the 5 V to power external digital circuitry e Power rating 250 mA at 5 V maximum fused to 1 A Caution Do not directly connect this 5 V power pin to analog or digital ground or to any other voltage source on the DAQCard 1200 or any other device Doing so can damage the DAQCard 1200 or the PC NI is not liable for any damage due to incorrect power connections National Instruments Corporation 3 31 DAQCard 1200 User Manual Chapter 3 Connecting the Signals Pin 49 is fused for up to 1

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