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Chapter 4

Theory of Operation

©

National Instruments Corporation

4-7

DAQCard-700 User Manual

Notice that only counter 0 is required for DAQ operations. The software
must track the number of conversions that have occurred and turn off
counter 0 after the required number of conversions has been obtained.

Single-Channel Data Acquisition

During single-channel data acquisition, a control register is set to select the
analog input channel before data acquisition is initiated. This multiplexer
setting remains constant during the entire data acquisition process;
therefore, all A/D conversion data is read from a single channel.

Multichannel (Scanned) Data Acquisition

Multichannel data acquisition is performed by enabling scanning during
data acquisition. Multichannel scanning is controlled by a scan counter.

For scanning operations, the scan counter decrements from the highest
numbered channel (selected by the user) through channel 0 and then repeats
the sequence. For RSE input mode, therefore, any number of channels from
2 to 16 can be scanned. For DIFF input mode, any number of channels from
2 to 8 can be scanned. Notice that the same AI range is used for all channels
in the scan sequence.

Data Acquisition Rates

The maximum data acquisition rate (number of samples per second) is
determined by the conversion period of the ADC plus the acquisition
time of its track-and-hold stage. During multichannel scanning, the data
acquisition rate is further limited by the settling time of the input
multiplexers and operational amplifier. After the input multiplexers are
switched, the amplifier must be able to settle to the new input signal value
to within 12-bit accuracy before an A/D conversion is performed, or 12-bit
accuracy cannot be achieved.

If the chosen data acquisition rate does not allow the specified settling time,
the analog input circuitry may not perform at 12-bit accuracy. Furthermore,
if the maximum data acquisition rate is exceeded, A/D conversions may be
lost. The maximum data acquisition rate and settling time specifications at
various input ranges are listed in Appendix A,

Specifications

.

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Содержание DAQ Series

Страница 1: ...DAQ DAQCard 700 User Manual Multifunction I O Devices for the PCMCIA Bus DAQCard 700 User Manual December 2001 Edition Part Number 320676D 01 ...

Страница 2: ...25 725 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...

Страница 3: ...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 a...

Страница 4: ...hapter 2 Installing and Configuring the DAQCard 700 Installing the Software 2 1 Installing the Hardware 2 1 Configuring the DAQCard 700 2 3 Configuring Analog Input 2 3 Analog Input Mode 2 4 Configuring Digital I O 2 5 Configuring Counters 2 5 Chapter 3 Connecting Signals I O Connector 3 1 Signal Connection Descriptions 3 2 Connecting Analog Input Signals 3 3 Types of Signal Sources 3 4 Measuremen...

Страница 5: ...4 1 PCMCIA I O Channel Interface Circuitry 4 3 Analog Input and Data Acquisition Circuitry 4 4 Analog Input Circuitry 4 5 Data Acquisition Timing Circuitry 4 6 Single Channel Data Acquisition 4 7 Multichannel Scanned Data Acquisition 4 7 Data Acquisition Rates 4 7 Digital I O Circuitry 4 8 Timing I O Circuitry 4 9 Appendix A Specifications Appendix B Differences between the PC LPM 16 and the DAQCa...

Страница 6: ...rom 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 Bold text denotes items that you must select or click on in...

Страница 7: ...led 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 the DAQ hardware and application hints Software documentation You may have both application software and NI DAQ documentation After you set up the hardware use either the application software documenta...

Страница 8: ...t all the analog digital and timing signals to the card The DAQCard 700 is fully software configurable and factory calibrated The low power consumption of the DAQCard 700 makes the card ideal for portable computers making remote data acquisition more practical The card requires very little power when operating and has a standby mode that uses even less power thus extending the computer battery lif...

Страница 9: ...l Instruments DAQ hardware you can use NI application development environment ADE software or other ADEs In either case you use NI DAQ NI DAQ NI DAQ ships with the DAQCard 700 and 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 700 NI DAQ carries out many of the complex interactions such as programming interrupt...

Страница 10: ...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 applicati...

Страница 11: ...block You can attach signal input and output wires to screw terminals on the connector block and therefore to the DAQCard 700 I O connector The CB 50 is useful for the initial prototyping of an application or in situations in which the DAQCard 700 interconnections are frequently changed After you develop a final field wiring scheme however you may want to develop your own cable This section contai...

Страница 12: ... 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 acce...

Страница 13: ...tly connected to MAINS1 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 directly connected to the low voltage insta...

Страница 14: ...ustrial use such as stationary motors with a permanent connection to the building fixed installation 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 ...

Страница 15: ... 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 700 1 Power off the computer Note You must have Card Socket Services 2 0 or later on the computer The DAQCard 700 requires a 32 byte I O address...

Страница 16: ...p the cable by the connector you are plugging or unplugging Never pull directly on the I O cable to unplug it from the DAQCard 700 5 Plug in and power on the computer The DAQCard 700 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 Signals Figure 2 1 shows an example of ...

Страница 17: ... to the NI DAQ Function Reference Help file Configuring Analog Input At startup the DAQCard 700 defaults to the following configuration Referenced single ended RSE input mode 10 V AI range Table 2 1 lists the available AI configurations for the DAQCard 700 and shows the default settings The AI circuitry is software configurable Caution Connections including power signals to ground and vice versa t...

Страница 18: ...ion is useful for measuring floating signal sources See the Types of Signal Sources section of Chapter 3 Connecting Signals for more information With this input configuration the DAQCard 700 can monitor 16 different AI channels Considerations for using the RSE input mode are discussed in Chapter 3 Connecting Signals Notice that in this mode the return path of the signal is analog ground at the con...

Страница 19: ...ing Signals Notice that the signal return path is through the negative terminal of the instrumentation amplifier and through channel 8 9 10 11 12 13 14 or 15 depending on which channel pair you select Configuring Digital I O The DAQCard 700 always uses one 8 bit digital output port and one 8 bit digital input port Configuring Counters You can use the MSM82C54 for general purpose applications such ...

Страница 20: ...the DAQCard 700 I O connector This connector is attached to the ribbon cable that extends from the PCMCIA slot when the card is installed and the cable is connected Caution Connections including power signals to ground and vice versa that exceed any of the maximum signal ratings on the DAQCard 700 can result in damage to the DAQCard 700 NI is not liable for any injuries or damage resulting from in...

Страница 21: ...o the digital ground signal 20 21 NC Not Connected These pins are not connected 22 29 DIN 0 7 Input Input Digital Data Lines 0 through 7 DIN7 is the MSB most significant bit DIN0 the LSB least significant bit 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 AIGND ACH0 ACH1 ACH2 ACH3 ACH4 ACH5 ACH6 ACH7 DGND...

Страница 22: ...pin is the inversion of counter 1 output 39 EXTINT Input External Interrupt This pin is used for input of the external interrupt signal 40 EXTCONV Input External Control This pin is used for input of the external control signal to trigger A D conversions 41 OUT0 Output Counter 0 Output This pin is the output of counter 0 42 GATE0 Input Counter 0 Gate Input This pin is the gate input for counter 0 ...

Страница 23: ...d The connection instructions described later in this chapter for grounded signal sources are designed to eliminate this ground potential difference from the measured signal Floating Signal Sources A floating or nonreferenced signal source is one that is not connected in any way to the building ground system and has instead an isolated ground reference point Some examples of floating signal source...

Страница 24: ...nnected in any way to the building ground system but rather has an isolated ground reference point Some examples of floating measurement systems are battery powered instruments instruments powered with a nonground referenced power adapter and instruments with differential inputs A floating measurement system will float to the level of the signals being measured Input Configurations To measure diff...

Страница 25: ...ingle Ended Mode RSE Although the instrumentation amplifier on the DAQCard 700 is actually bypassed in RSE input mode the effect of this mode is the same as if signals connected to ACH 0 15 were routed to the positive terminal of the instrumentation amplifier and the negative terminal of the instrumentation amplifier were connected to the analog ground reference of the DAQCard 700 Thus the voltage...

Страница 26: ...teria are met by all input signals Input signals are high level greater than 1 V Leads connecting the signals to the DAQCard 700 are less than 15 ft All input signals share a common reference signal at the source If any of the preceding criteria are not met use the DIFF input mode The RSE input mode is referenced but you can use this mode for nonreferenced signal sources In addition if the compute...

Страница 27: ...t grounded signal sources to a DAQCard 700 in a ground referenced computer carefully observe the polarity to avoid shorting the signal source output A laptop operating from a battery is not grounded A laptop powered from an AC DC adapter may or may not be grounded Figure 3 3 Single Ended Analog Input Signal Connections DAQCard 700 Signal Source VS2 3 4 5 18 1 2 Measured Voltage V ACH 0 15 Input Mu...

Страница 28: ... configured for DIFF input mode each signal uses two of the multiplexer inputs one for the signal and one for its reference signal Therefore only eight AI channels are available when using DIFF input mode DIFF input mode should be used when any of the following conditions are present Input signals are low level less than 1 V Leads connecting signals to the DAQCard 700 are greater than 15 ft Any of...

Страница 29: ...unded Signal Sources With this type of connection the instrumentation amplifier rejects both the common mode noise in the signal and the ground potential difference between the signal source and the DAQCard 700 ground shown as Vcm in Figure 3 4 DAQCard 700 Device in DIFF Configuration Grounded Referenced Signal Source Common Mode Noise Ground Potential and so on Vs Vcm I O Connector 17 18 1 2 Meas...

Страница 30: ... Floating Sources The 100 kΩ resistors shown in Figure 3 5 create a return path to ground for the bias currents of the instrumentation amplifier If a return path is not provided the instrumentation amplifier bias currents cause stray capacitances resulting in uncontrollable drift and possible saturation in the amplifier Typically values from 10 kΩ to 100 kΩ are used DAQCard 700 Device in DIFF Conf...

Страница 31: ...ejection Considerations Figures 3 4 and 3 5 show connections for signal sources that are already referenced to some ground point with respect to the DAQCard 700 In these cases the instrumentation amplifier can reject any voltage due to ground potential differences between the signal source and the DAQCard 700 In addition with DIFF input connections the instrumentation amplifier can reject common m...

Страница 32: ... of floating that occurs between the signal ground and the DAQCard 700 ground Connecting Digital I O Signals Pins 22 through 37 of the I O connector are DIO signal pins Pins 22 through 29 are digital input pins Pins 30 through 37 are digital output pins Pins 19 and 50 are digital ground pins Refer to Appendix A Specifications for more information about the specifications and ratings for the DIO li...

Страница 33: ... can be used to power external digital circuitry that draws up to 1 A Pin 49 is connected to a 1 A resettable fuse on the card The actual current available from this signal may be less than 1 A depending on the computer Notice also that any current drawn from this line adds to the power requirements from the computer Digital Input Port Digital Output Port TTL Signal 5 V 5 V LED I O Connector DAQCa...

Страница 34: ...is signal is explained in the Data Acquisition Counter and Timing Connections section Pins 38 and 41 through 48 carry general purpose timing signals from the MSM82C54 These signals are explained under the General Purpose Counter and Timing Signal Connections section Data Acquisition Counter and Timing Connections Counter 0 on the MSM82C54 is used as a sample interval counter in timed A D conversio...

Страница 35: ...grammed for various operations The only exceptions are counter 0 which has an internal 1 MHz clock and counter 1 which can also be configured to use this clock The MSM82C54 is described briefly in the Timing I O Circuitry section of Chapter 4 Theory of Operation To perform pulse and square wave generation program a counter to generate a timing signal at its OUT output pin To count events program a...

Страница 36: ...nal at the GATE input is high The pulse width equals the counter difference loaded value minus read value multiplied by the CLK period To measure time lapse program a counter to be edge gated Apply an edge to the counter GATE input to start the counter Program the counter to start counting after receiving a low to high edge The time lapse since receiving the edge equals the counter value differenc...

Страница 37: ...gate is applied The frequency of the input signal then equals the count value divided by the gate period Figure 3 9 shows the connections for a frequency measurement application You could also use a second counter to generate the gate signal in this application Figure 3 9 Frequency Measurement Application The GATE CLK and OUT signals for counters 1 and 2 are available at the I O connector In addit...

Страница 38: ...Figure 3 10 are referenced to the rising edge of the CLK signal Refer to Appendix A Specifications for more information about the MSM82C54 DIO specifications CLK GATE OUT VIH VIL VIH VIL VOH VOL sc pwh pwl gsu gh gwh gwl outg outc sc pwh pwl gsu gh gwh gwl outc outg clock period clock high level clock low level gate setup time gate hold time gate high level gate low level output delay from clock o...

Страница 39: ...Manual 4 Theory of Operation This chapter includes an overview of the DAQCard 700 and explains the operation of each functional unit making up the DAQCard 700 Functional Overview The block diagram in Figure 4 1 shows a functional overview of the DAQCard 700 ...

Страница 40: ...try Buffer PCMCIA I O Channel I O Connector 12 Bit Sampling ADC Instrumentation Amplifier Input Mux1 Dual 8 Channel Single Ended Input Mux2 4 Channel PCMCIA I O Channel Interface MSM82C54 Scanning Counter Interrupt Interface OUT0 EXTCONV A D Timing Digital I O DC DC Converter 512 Word FIFO GATE 0 2 CLK 1 2 OUT 0 2 3 3 2 From A D FIFO 8 8 To Analog Circuit To Analog Circuit 1 A Resettable Fuse 5 V ...

Страница 41: ... with the discussion of the AI circuitry PCMCIA I O Channel Interface Circuitry The PCMCIA I O channel interface circuitry consists of an address bus a data bus interrupt lines and several control and support signals The components making up the DAQCard 700 PCMCIA I O channel interface circuitry are shown in Figure 4 2 Figure 4 2 PCMCIA I O Interface Circuitry Block Diagram PCMCIA I O Channel Addr...

Страница 42: ...gister select signals and read write signals The data buffers control the direction of data transfer on the bidirectional data lines based on whether the transfer is a read or write The interrupt control circuitry routes any enabled interrupts to the IREQ line which is routed to an available interrupt request line by the system motherboard The DAQCard 700 generates interrupts in three different si...

Страница 43: ...channels 0 and 8 1 and 9 and so on With the input multiplexer stage input overvoltage protection of 30 V is available powered on or off The DAQCard 700 uses a 12 bit successive approximation ADC Software selectable gains of 1 0 5 and 0 25 for the input signal combined with the ADC fixed input range of 10 V yield three useful AI signal ranges These ranges are 10 V 5 V and 2 5 V When an A D conversi...

Страница 44: ...ssive A D conversions at a carefully timed interval called the sample interval The DAQ timing circuitry consists of various clocks and timing signals that perform this timing The DAQCard 700 can perform two types of data acquisition single channel data acquisition and multichannel scanned data acquisition Scanned data acquisition uses a counter to automatically switch between AI channels during da...

Страница 45: ... sequence For RSE input mode therefore any number of channels from 2 to 16 can be scanned For DIFF input mode any number of channels from 2 to 8 can be scanned Notice that the same AI range is used for all channels in the scan sequence Data Acquisition Rates The maximum data acquisition rate number of samples per second is determined by the conversion period of the ADC plus the acquisition time of...

Страница 46: ...as 16 TTL compatible DIO lines DIN 0 7 are digital input lines and DOUT 0 7 are digital output lines These lines are monitored or driven by the Digital Input Register and the Digital Output Register respectively Reading the Digital Input Register returns the current state of DIN 0 7 Writing the Digital Output Register drives the new value onto DOUT 0 7 An external device may drive the EXTINT signa...

Страница 47: ...ers of the MSM82C54 are available for general use but Counter 0 is also used internally for DAQ timing Figure 4 5 shows a block diagram of both groups of TIO circuitry Figure 4 5 Timing I O Circuitry Block Diagram PCMCIA I O Channel I O Connector OUT0 GATE0 CLK0 CLK1 GATE1 OUT1 CLK2 GATE2 OUT2 CTR RD WR Input Mux 1 MHz Clock A D Conversion Logic Interrupt Interface MSM82C54 Counter Timer 8 Data CL...

Страница 48: ...from the onboard oscillator The timebases for counters 1 and 2 can be supplied externally through the 50 pin I O connector In addition counter 1 can optionally use the same onboard 1 MHz clock that is used for DAQ timing which facilitates synchronous operations The counters in the MSM82C54 can be diagrammed as shown in Figure 4 6 Figure 4 6 Counter Block Diagram Each counter has a clock input pin ...

Страница 49: ...f ADC Successive approximation Resolution 12 bits worst case code range 2024 to 2023 due to software calibration Max sampling rate 100 kS s1 Input signal ranges 10 V 5 V 2 5 V software selectable Input coupling DC Max working voltage signal common mode Each input should remain within 9 5 V of AIGND in DIFF mode Overvoltage protection 30 V powered on 30 V powered off Inputs protected ACH 0 15 FIFO ...

Страница 50: ...ration 0 036 max Before software calibration 0 07 of reading typ 0 4 max Amplifier Characteristics Input impedance 1 GΩ in parallel with 40 pF CMRR all input ranges 72 dB DC to 60 Hz Dynamic Characteristics Settling time 0 024 accuracy 1 LSB for full scale step 25 µs max at 10 V 5 V 10 µs at 2 5 V RSE System noise 0 5 LSB rms at 5 V range Stability Recommended warm up time 15 min Onboard calibrati...

Страница 51: ... high with 100 kΩ resistors Maximum voltage input rating 0 5 to 5 0 V with respect to DGND Digital logic levels for MSM82C54 Level Min Max Input low voltage 0 V 0 8 V Input high voltage 2 V 5 V Input low current Vin 0 V 50 µA Input high current Vin 5 V 1 µA Output low voltage Iout 4 mA 0 4 V Output high voltage Iout 4 mA 3 7 V Level Min Max Input low voltage 0 8 V Input high voltage 2 2 V Input lo...

Страница 52: ...wer down mode Note These power usage figures do not include the power used by external devices that you have connected to the fused supply present on the I O connector Physical PC Card type Type II I O connector 50 pin male Maximum Working Voltage Maximum working voltage refers to the signal voltage plus the common mode voltage Channel to earth 30 VAC or 60 VDC installation category I Channel to c...

Страница 53: ...A Compliant Electrical emissions EN 55011 Class A at 10 m FCC Part 15A above 1 GHz Electrical immunity Evaluated to EN 61326 1997 A1 1998 Table 1 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 To...

Страница 54: ...e summarizes the significant differences Table B 1 Functionality Differences Between the PC LPM 16 and the DAQCard 700 Functionality PC LPM 16 DAQCard 700 FIFO read Two 8 bit words One 16 bit word FIFO buffer size 16 samples 512 samples Maximum sample rate 50 kS s 100 kS s Supply voltages at I O connector 5 V 12 V 12 V 5 V Maximum input voltage rating 45 V 30 V ADC calibration Hardware calibration...

Страница 55: ... OS 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 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 digital I O and counter timer...

Страница 56: ...r a complete list of functions supported by the DAQCard 700 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 700 Where can I find the information that I need to accomplish this task Register level programming is not recommended for most users Even experienced re...

Страница 57: ... 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 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 ...

Страница 58: ... 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 m...

Страница 59: ...cent plus or minus 5 V 5 VDC source signal A A amperes AC alternating current ACH analog input channel signal ActiveX controls a special form of Automation Object ActiveX Controls are similar to Visual Basic custom controls VBXs but their architecture is based on OLE ActiveX Controls can be freely plugged into any OLE enabled development tool application or Web browser A D analog to digital ADC A ...

Страница 60: ...and negative values for example 5 V to 5 V bit one binary digit either 0 or 1 buffer temporary storage for acquired or generated data software byte eight related bits C C Celsius CE card enable signal CIS card information structure CLK clock input signal CMOS complementary metallic oxide semiconductor CMRR common mode rejection ratio COM communications port counter timer a circuit that counts exte...

Страница 61: ...driver software software that controls a specific hardware device such as a DAQ device E EEPROM erasable programmable read only memory ROM that can be erased usually by ultraviolet light exposure and reprogrammed EXTCONV external control signal to trigger A D conversions EXTINT external interrupt signal F F farads FIFO first in first out ft feet G GATE gate input signal gh gate hold time gsu gate ...

Страница 62: ...VIEW a graphical programming language LED light emitting diode LSB least significant bit M max maximum MAX Measurement and Automation Explorer a controlled centralized configuration environment that allows you to configure your National Instruments DAQ device MB megabytes of memory MSB most significant bit mux multiplexer a switching device with multiple inputs that sequentially connects each of i...

Страница 63: ...dit card sized expansion card that fits in a PCMCIA slot often referred to as a PCMCIA card PCMCIA Personal Computer Memory Card International Association pwh clock high level pwl clock low level R RAM random access memory RH relative humidity rms root mean square ROM read only memory RSE referenced single ended mode all measurements are made with respect to a common reference measurement system o...

Страница 64: ...gger any event that causes or starts some form of data capture TTL transistor transistor logic two s complement given a number x expressed in base 2 with n digits to the left of the radix point the base 2 number 2n x U unipolar a signal range that is always positive for example 0 to 10 V V V volts Vcm common mode noise VDC volts direct current Vdiff differential input signal VI virtual instrument ...

Страница 65: ... 3 4 floating measurement system 3 5 floating signal sources 3 4 ground referenced measurement system 3 5 ground referenced signal sources 3 4 input configurations 3 5 instrumentation amplifier 3 5 pins for analog input 3 3 recommended input configurations 3 7 single ended connection s 3 7 single ended input mode 3 6 types of measurement systems 3 4 types of signal sources 3 4 B bus interface A 4 ...

Страница 66: ...4 7 theory of operation 4 6 DGND signal 3 2 3 3 DIFF input configuration 2 5 definition table 2 4 differential input mode 3 6 differential connections common mode signal rejection considerations 3 12 definition 3 9 floating signal sources 3 11 grounded signal sources 3 10 when to use 3 9 digital I O circuitry 4 8 configuration 2 5 signal connections 3 13 specifications A 2 DIN 0 7 signal 3 2 DOUT ...

Страница 67: ...3 6 instrumentation amplifier figure 3 5 recommended input configurations 3 7 RSE definition table 2 4 purpose 2 4 single ended mode 3 6 installation DAQCard 1200 2 1 instrumentation amplifier figure 3 5 purpose and use 3 6 M measurement systems floating 3 5 ground referenced 3 5 multichannel scanned data acquisition 4 7 N National Instruments documentation viii National Instruments Web support E ...

Страница 68: ...ctor exceed maximum ratings caution 3 1 pin assignments figure 3 2 power connections 3 14 signal descriptions 3 2 timing connections data acquisition counter and timing connections 3 15 general purpose counter and timing signal connections 3 16 single channel data acquisition 4 7 single ended connection considerations connecting signal source figure 3 8 when to use 3 7 single ended input mode 3 6 ...

Страница 69: ...8 pulse and square wave generation 3 16 pulse width measurement 3 17 time lapse measurement 3 17 timing specifications 3 19 general purpose counter and timing signal connections 3 16 timing I O circuitry block diagram 4 9 counter block diagram 4 10 specifications A 3 theory of operation 4 9 U unpacking the DAQCard 1200 1 5 W Web support from National Instruments E 1 worldwide technical support E 2...

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