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DAQ DAQCard-1200, User Manual

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DAQ DAQCard-1200 User Manual Download Page 59

Chapter 4

Theory of Operation

DAQCard-1200 User Manual

4-4

ni.com

Figure 4-3.

Timing Circuitry

Sample

Interval

Counter

GATEB1
CLKB1

OUTB1

CLKA2

GATEA2

DAC

Timing

OUTA2

GATEB2

CLKB2

OUTB2

GATEB1

CLKB1

OUTB1

OUTB0

GATEB0

EXTCONV*

EXTTRIG

EXTUPDATE*

I/O

Connector

General

Purpose

Counter

GATEB2
CLKB2

OUTB2

Scan

Interval/
General

Purpose

Counter

GATEB1
CLKB1

OUTB1

MUX

CLKA0

Timebase

Extension/

General

Purpose

Counter

OUTB0
GATEB0

CLKB0

2 MHz

Source

82C53 Counter/Timer

Group B

A/D Conversion Logic

OUTB1

D/A Conversion Logic

DAC

Timing

CLKA2
GATEA2

OUTA2

82C53 Counter/Timer

Group A

+5 V

Sample

Counter

GATEB1

CLKA2
GATEA2

8

Data

CTR WRT

CTR RD

Decode

Circuitr

y

MUX

OUTB0

1 MHz Source

Summary of Contents for DAQCard-1200

Page 1: ...DAQ DAQCard 1200 User Manual Multifunction I O Card for the PCMCIA Bus DAQCard 1200 User Manual December 2001 Edition Part Number 320936C 01...

Page 2: ...5 725 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...

Page 3: ...n 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 outsid...

Page 4: ...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...

Page 5: ...ought 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...

Page 6: ...Optional Equipment 1 4 Unpacking 1 5 Safety Information 1 5 Chapter 2 Installing and Configuring the DAQCard 1200 Installing the Software 2 1 Installing the Hardware 2 1 Configuring the DAQCard 1200 2...

Page 7: ...gnals 3 14 Connecting Digital I O Signals 3 15 Port C Pin Connections 3 17 Timing Specifications 3 18 Mode 1 Input Timing 3 19 Mode 1 Output Timing 3 20 Mode 2 Bidirectional Timing 3 20 Connecting Ana...

Page 8: ...ate 4 11 DAC Timing 4 11 Digital I O 4 12 Chapter 5 Calibration Loading Calibration Constants 5 1 Self Calibration 5 2 External Calibration 5 2 Appendix A Specifications Appendix B Differences among t...

Page 9: ...up 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 inj...

Page 10: ...iled 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...

Page 11: ...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...

Page 12: ...ifications 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 DAQCard 1200 DAQCard 1200 I O cable DAQCard...

Page 13: ...ou 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 Figure 1 1 The Relati...

Page 14: ...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 de...

Page 15: ...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...

Page 16: ...are measurements on circuits not derived from MAINS and specially protected internal MAINS derived circuits Installation category II is for measurements performed on circuits directly connected to th...

Page 17: ...l 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 prote...

Page 18: ...erly 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 in...

Page 19: ...e way 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...

Page 20: ...DAQ User Manual for PC Compatibles Configuring Analog Input At startup the DAQCard 1200 defaults to the following configuration Referenced single ended input mode 5 V AI range Table 2 1 lists the ava...

Page 21: ...cting 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 sig...

Page 22: ...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 in...

Page 23: ...to FFF hex 4 095 decimal Configuring Digital I O 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 p...

Page 24: ...200 I 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 Caution Connections including power signals to...

Page 25: ...PC7 PC5 PC3 PC1 PB7 PB5 PB3 PB1 PA7 PA5 PA3 PA1 DGND AGND AISENSE AIGND ACH6 ACH4 ACH2 ACH0 DGND OUTB2 GATB1 EXTCONV EXTTRIG PC6 PC4 CLKB2 GATB0 PC2 PC0 PB6 PB4 PB2 PB0 PA6 PA4 PA2 PA0 DAC1OUT DAC0OUT...

Page 26: ...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 0 7 DIO DGND Port A 0 through 7 Bidirectional data lines for po...

Page 27: ...aximum 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 rating Caution Exceeding the inpu...

Page 28: ...se the instrumentation amplifier in different ways Figure 3 2 shows a diagram of the DAQCard 1200 instrumentation amplifier Figure 3 2 DAQCard 1200 Instrumentation Amplifier Table 3 2 Bipolar and Unip...

Page 29: ...e 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 Flo...

Page 30: ...lowing 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 recommen...

Page 31: ...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 co...

Page 32: ...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...

Page 33: ...or configuration instructions 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 si...

Page 34: ...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 t...

Page 35: ...nal 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 instrumentat...

Page 36: ...eject 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...

Page 37: ...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 l...

Page 38: ...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...

Page 39: ...s and sensing external device states such as the switch in Figure 3 8 Digital output applications include sending TTL signals and driving external devices such as the LED shown in Figure 3 8 Note The...

Page 40: ...rent 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...

Page 41: ...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 Out...

Page 42: ...or an input transfer in mode 1 Figure 3 9 Mode 1 Timing Specifications for Input Transfers Name Description Minimum Maximum T1 STB pulse width 100 T2 STB 0 to IBF 1 150 T3 Data before STB 1 20 T4 STB...

Page 43: ...Specifications for Output Transfers Mode 2 Bidirectional Timing Figure 3 11 shows the timing specifications for bidirectional transfers in mode 2 Name Description Minimum Maximum T1 WRT 0 to INTR 0 2...

Page 44: ...me 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 t...

Page 45: ...d to as A0 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 int...

Page 46: ...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 A0 and the DAQ sequenc...

Page 47: ...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 dat...

Page 48: ...rnally 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 ri...

Page 49: ...TE signal or counter A2 is sensed Furthermore an interrupt is generated whenever a rising edge is detected on the EXTUPDATE bit The interrupt service routine can write the next value to the DAC When t...

Page 50: ...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...

Page 51: ...cations 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...

Page 52: ...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...

Page 53: ...re 3 19 Frequency 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 Signal Sour...

Page 54: ...ed 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...

Page 55: ...able 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 avail...

Page 56: ...f the DAQCard 1200 Figure 4 1 DAQCard 1200 Block Diagram I O Connector 5 V PCMCIA I O Channel Interface Decode Circuitry Core Logic 4 4 8 8 8 1 1 8 8 8 8 3 Interrupt Interface 82C53 Ctr Timer Group A...

Page 57: ...peration of each of the DAQCard 1200 components PC Card I O 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...

Page 58: ...the system has 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 chann...

Page 59: ...DATE I O Connector General Purpose Counter GATEB2 CLKB2 OUTB2 Scan Interval General Purpose Counter GATEB1 CLKB1 OUTB1 MUX CLKA0 Timebase Extension General Purpose Counter OUTB0 GATEB0 CLKB0 2 MHz Sou...

Page 60: ...Group B and includes B0 B1 and B2 You can use counters B0 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 B0 and B1 f...

Page 61: ...nel 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 acqu...

Page 62: ...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...

Page 63: ...her 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...

Page 64: ...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 gai...

Page 65: ...igure 4 5 shows the AO circuitry Figure 4 5 Analog Output Circuitry Analog Output Circuitry Each AO channel contains a 12 bit DAC The DAC in each AO channel generates a voltage proportional to the 5 V...

Page 66: ...update the DAC voltages In the first mode the DAC output voltage is updated as soon as you write to the corresponding DAC This mode is called the immediate update mode In the second mode the DAC outp...

Page 67: ...the DAQCard 1200 I O connector Figure 4 6 shows the DIO circuitry Figure 4 6 Digital I O Circuitry All three ports on the 82C55A are TTL compatible When enabled the digital output ports are capable of...

Page 68: ...tion Constants The DAQCard 1200 device is factory calibrated at approximately 25 C to the levels indicated in Appendix A Specifications The associated calibration constants the values that were writte...

Page 69: ...y 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 The DAQCard 1...

Page 70: ...f channels 8 single ended 8 pseudodifferential or 4 differential software selectable Resolution 12 bits 1 in 4 096 Max single channel sampling rate 100 kS s Input signal ranges Input coupling DC Type...

Page 71: ...racy 0 5 LSB typ dithered 1 5 LSB max undithered DNL 1 LSB max No missing codes 12 bits guaranteed Offset error Pre gain error after calibration 10 V max Pre gain error before calibration 20 mV max Po...

Page 72: ...mic Characteristics Bandwidth Small signal 3 dB Settling time to full scale step System noise not including quantization error Gain Bandwidth 1 10 250 kHz 20 150 kHz 50 60 kHz 100 30 kHz Gain Accuracy...

Page 73: ...20 kS s1 Type of DAC Double buffered Data transfers Interrupts programmed I O Transfer Characteristics Relative accuracy INL 0 5 LSB typ 1 LSB max DNL 0 5 LSB typ 0 9 LSB max Monotonicity 12 bits gua...

Page 74: ...mA momentary short circuit protection to ground Power on state 0 to 110 ms 2 V to 5 V 110 ms 0 V mV Dynamic Characteristics Settling time to full scale step 20 s to 1 LSB accuracy Noise 400 Vrms typ D...

Page 75: ...Number of channels 3 counters timers Digital logic levels Level Min Max Input low voltage 0 3 V 0 8 V Input high voltage 2 2 V 5 3 V Output low voltage Iout 2 5 mA 0 4 V Output high voltage Iout 40 A...

Page 76: ...ax Max source frequency 8 MHz Min source pulse duration 125 ns Min gate pulse duration 100 s Data transfers Interrupts programmed I O Digital Trigger Compatibility TTL Response Rising edge Pulse width...

Page 77: ...ets the requirements of the following standards for safety and electrical equipment for measurement control and laboratory use EN 61010 1 1993 A2 1995 IEC 61010 1 1990 A2 1995 UL 3111 1 1994 CAN CSA c...

Page 78: ...n 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 lin...

Page 79: ...on 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 don...

Page 80: ...nnot use DMA Waveform generation Can do waveform generation on one DAC and immediateupdates on the other DAC Can do waveform generation on one DAC and immediate updates on the other Should do either i...

Page 81: ...version 6 6 x or version 4 9 4 or earlier What is the best way 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 click...

Page 82: ...mplete list of functions supported by the DAQCard 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 w...

Page 83: ...the latest example programs system configurators tutorials technical news as well as a community of developers ready to share their own techniques Customer Education NI provides a number of alternati...

Page 84: ...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 tec...

Page 85: ...106 G giga 109 t tera 1012 Numbers Symbols degrees 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 han...

Page 86: ...nalog input AIGND analog input ground signal AISENSE analog input sense signal AO analog output AWG American Wire Gauge B BCD binary coded decimal bipolar a signal range that includes both positive an...

Page 87: ...and possibly generating control signals with D A and or DIO devices in the same computer DATA Data Lines at the Specified Port the signal that indicates when teh data on the data lines at a specified...

Page 88: ...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 st...

Page 89: ...ations channels operator interface devices and or data acquisition and control interfaces IBF Input Buffer Full A high signal on this handshaking line indicates that data has been loaded into the inpu...

Page 90: ...nt bit N NC not connected signal NI National Instruments NI DAQ National Instruments driver software for DAQ hardware NRSE nonreferenced single ended mode all measurements are made with respect to a c...

Page 91: ...humidity RMA Return Material Authorization rms root mean square RSE referenced single ended mode input mode where the negative input of the instrumentation amplifier is referenced to AISENSE AIGND whi...

Page 92: ...nt VCC positive supply voltage from the PCMCIA bus usually 5V VDC volts direct current VI virtual instrument 1 a combination of hardware and or software elements typically used with a PC that has the...

Page 93: ...timing continuous data acquisition 4 8 data acquisition operation 4 8 interval data acquisition 4 8 polarity configuration 2 4 settings table 2 3 specifications amplifier characteristics A 2 dynamic...

Page 94: ...haracteristics A 4 voltage output A 5 theory of operation 4 10 B bus interface specifications A 7 C calibration EEPROM storage 5 1 loading calibration constants 5 1 overview 5 1 CLK signals general pu...

Page 95: ...ersus gain table 4 9 data acquisition timing circuitry continuous data acquisition 4 8 data acquisition operation 4 8 interval data acquisition 4 8 data acquisition timing connections See also general...

Page 96: ...purpose timing signal connections 3 29 frequently asked questions E 1 G GATB0 signal table 3 3 GATB1 signal table 3 4 GATB2 signal table 3 4 GATE signals general purpose timing signal connections 3 2...

Page 97: ...ide offices E 2 National Instruments documentation xii NI Developer Zone E 1 NI DAQ driver software 1 2 NRSE input configuration 2 5 definition table 2 4 recommended input configurations table 3 7 sin...

Page 98: ...ipolar and unipolar signal range versus gain table 3 5 common mode signal rejection 3 13 differential connections floating signal sources 3 8 grounded signal sources 3 10 single ended connections 3 11...

Page 99: ...are 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 T technical support resources E...

Page 100: ...x DAQCard 1200 User Manual I 8 ni com U unpacking the DAQCard 1200 1 5 V voltage output specifications A 5 W Web support from National Instruments E 1 worldwide technical support E 2 WRT signal table...

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