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Table of Contents

DAQMeter DAQCard-4050 User Manual

National Instruments Corporation

Accuracy Considerations ................................................................. 3-3

Input Impedance................................................................ 3-3
AC Noise Effects............................................................... 3-4
Thermal EMF .................................................................... 3-4

AC Voltages ................................................................................................... 3-5

True RMS Method........................................................................... 3-5
Input Ranges .................................................................................... 3-5
Accuracy Considerations ................................................................. 3-6

Frequency Response.......................................................... 3-6
Crest Factor ....................................................................... 3-7
AC Voltage Offset............................................................. 3-8

Measuring Resistance ................................................................................................... 3-8

Signal Connections ........................................................................................ 3-8
Input Ranges .................................................................................................. 3-9
Continuity Measurements .............................................................................. 3-10

Testing Diodes.............................................................................................................. 3-10

Signal Connections ........................................................................................ 3-10

Measuring Current........................................................................................................ 3-11

Appendix A
Specifications

Appendix B
PC Card Questions and Answers

Appendix C
Customer Communication

Glossary

Index

Содержание DAQMeter DAQCard-4050

Страница 1: ...DAQCard 4050 User Manual Digital Multimeter Card for PCMCIA DAQMeter DAQCard 4050 User Manual February 1997 Edition Part Number 321427A 01 Copyright 1997 National Instruments Corporation All Rights R...

Страница 2: ...mark 45 76 26 00 Finland 09 527 2321 France 01 48 14 24 24 Germany 089 741 31 30 Hong Kong 2645 3186 Israel 03 5734815 Italy 02 413091 Japan 03 5472 2970 Korea 02 596 7456 Mexico 5 520 2635 Netherland...

Страница 3: ...IDENTAL 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...

Страница 4: ...QMeter DAQCard 4050 1 1 What You Need to Get Started 1 2 Software Programming Choices 1 2 National Instruments Application Software 1 2 VirtualBench 1 3 DAQMeter DAQCard 4050 Instrument Driver and NI...

Страница 5: ...S Method 3 5 Input Ranges 3 5 Accuracy Considerations 3 6 Frequency Response 3 6 Crest Factor 3 7 AC Voltage Offset 3 8 Measuring Resistance 3 8 Signal Connections 3 8 Input Ranges 3 9 Continuity Meas...

Страница 6: ...1 Connecting Probes for Voltage Measurement 3 2 Figure 3 2 The Effect of Input Impedance on Signal Measurement 3 4 Figure 3 3 Connections for Resistance Measurement 3 8 Figure 3 4 Connections for Dio...

Страница 7: ...allation and Configuration explains safety instructions and describes how to install and configure a DAQMeter DAQCard 4050 Chapter 3 DMM Operation describes how to use your DAQMeter DAQCard 4050 and i...

Страница 8: ...ts and comments taken from programs The Glossary lists abbreviations acronyms metric prefixes mnemonics symbols and terms National Instruments Documentation The DAQMeter DAQCard 4050 User Manual is on...

Страница 9: ...ur connections Related Documentation The following document contains information that you may find helpful Your computer user manual Customer Communication National Instruments wants to receive your c...

Страница 10: ...to digital converter ADC with digital filtering which gives the card excellent resolution accuracy and noise rejection Coupled with a CSM series current shunt module available from National Instrument...

Страница 11: ...am and use your National Instruments DAQ hardware You can use LabVIEW LabWindows CVI VirtualBench or the DAQMeter DAQCard 4050 Instrument Driver National Instruments Application Software LabVIEW and L...

Страница 12: ...ut you benefit from the processing display and storage capabilities of PCs VirtualBench instruments load and save waveform data to disk in the same forms that can be used in popular spreadsheet progra...

Страница 13: ...s data acquisition systems Whether you are using the DAQMeter DAQCard 4050 Instrument Driver LabVIEW or LabWindows CVI your application uses the NI DAQ driver software as illustrated in Figure 1 1 Fig...

Страница 14: ...s and accessories to simplify making measurements For more specific information about these products refer to your National Instruments catalogue or website or call the office nearest you Unpacking Yo...

Страница 15: ...uter should never exceed 250 VDC or 250 Vrms DO NOT OPERATE DAMAGED EQUIPMENT The safety protection features built into this device can become impaired if the device becomes damaged in any way If the...

Страница 16: ...basic steps to installing a DAQCard 4050 1 If you have Windows 3 1 you must have Card Socket Services 2 0 or a later version software installed on your computer If you have Windows 95 you do not need...

Страница 17: ...ments including UL 3111 and IEC 1010 1 for the full ranges of applications supported by the DAQCard 4050 Before using any probes or accessories not supplied by National Instruments ensure that they me...

Страница 18: ...gure 2 2 With the plastic covers over the ends you can use the probes to directly probe the circuit or device to be tested With the plastic tip covers removed the test probes can accept standard banan...

Страница 19: ...ediately after inserting the DAQCard 4050 or powering up the computer can differ significantly from measurements made after the DAQCard 4050 has fully warmed up To minimize the effects of thermal drif...

Страница 20: ...ding rate A reading rate of 50 readings s filters noise at harmonics of 50 Hz while a reading rate of 60 readings s filters noise at harmonics of 60 Hz Since both 50 Hz and 60 Hz are multiples of 10 H...

Страница 21: ...e measurements measurements that need a high degree of accuracy you should consider problems associated with input impedance AC noise effects and thermal electromotive forces thermal EMFs Input Impeda...

Страница 22: ...minimize these errors keep the circuit under test and the DAQCard 4050 away from strong AC magnetic sources and minimize the area of the loop formed by the test leads Choosing the 10 readings s readin...

Страница 23: ...ue of an AC signal is the DC value required to produce an equivalent amount of heat in the same load The DAQCard 4050 first AC couples the measured signal to remove any DC components and then measures...

Страница 24: ...n to these factors consider the effects of the source impedance of your circuit These effects are described in the Input Impedance section earlier in this chapter Frequency Response The accuracy of th...

Страница 25: ...or of a signal is the ratio of the peak value of the signal to the RMS value of the signal For example a symmetrical square wave has a crest factor of 1 and an undistorted sine wave has a crest factor...

Страница 26: ...ould be Vmeasured 100 001 mVrms the 0 5 mVrms offset contributes only 0 001 mVrms of error and is therefore negligible However if the input voltage were only 10 mVrms the measured voltage would be 10...

Страница 27: ...50 measures resistance by sending a current through the test resistor and measuring the voltage this current develops across the resistor In the Extended Ohms range the DAQCard 4050 adds a 1 M resisto...

Страница 28: ...easured value to some low resistance value 10 is typical If the measured value is less than 10 there is continuity between the test probes Testing Diodes You can also use the DAQCard 4050 to measure t...

Страница 29: ...the DAQCard 4050 cable and the test probes as shown in Figure 3 5 Figure 3 5 Connections for Current Measurement Current shunt accessories contain a precision resistor that converts the current throug...

Страница 30: ...ting 50 60 Hz power line frequency 5 80 dB DC CMRR 130 dB AC CMRR 90 dB 60 Hz Input Characteristics Input bias current 100 pA 1 nA max Range Accuracy of reading of range Temperature Coefficient ppm of...

Страница 31: ...endent errors Range Accuracy of reading of range Temperature Coefficient ppm of reading ppm of range C Overrange 250 000 V 0 3 0 1 60 ppm 10 ppm 250 000 V 25 0000 V 0 4 0 2 60 ppm 80 ppm 27 0000 V 2 0...

Страница 32: ...ading ppm of range C Overrange Test Current 200 000 0 007 0 2 13 ppm 175 ppm 200 000 100 A 2 00000 k 0 007 0 03 13 ppm 20 ppm 2 00000 k 100 A 20 0000 k 0 007 0 02 13 ppm 3 ppm 20 0000 k 100 A 200 000...

Страница 33: ...fications Bus interface type Slave Safety Designed in accordance with IEC 1010 1 and UL 3111 for measuring and testing equipment Installation Category II Pollution Degree 2 Double Insulated Indoor use...

Страница 34: ...nstruments Corporation A 5 DAQMeter DAQCard 4050 User Manual Physical PCMCIA card type Type II I O connector 4 pin male Environment Operating temperature 0 to 55 C Storage temperature 55 to 150 C Rela...

Страница 35: ...d I use with my PC Cards The PC Card should work with Windows 3 x Windows 95 and Windows NT We strongly recommend that you use Windows 95 2 Do I need to use my PCMCIA configuration utility to configur...

Страница 36: ...not usable When a call uses the interrupt the interrupt never occurs and the computer locks up waiting for a response For information about how to locate an interrupt that is free to be used refer to...

Страница 37: ...ion Utility for a particular I O space save the configuration If there is a conflict the configuration utility will attempt to report an error describing the conflict 4 How do I find usable interrupt...

Страница 38: ...ard Services When you have determined what memory is available for Card Services reinstall your memory manager and make the necessary changes to provide Card Services with the memory needed We suggest...

Страница 39: ...systems does not answer your questions we offer fax and telephone support through our technical support centers which are staffed by applications engineers Electronic Services National Instruments ha...

Страница 40: ...urce from which you purchased your software to obtain support Telephone Fax Australia 03 9879 5166 03 9879 6277 Austria 0662 45 79 90 0 0662 45 79 90 19 Belgium 02 757 00 20 02 757 03 11 Canada Ontari...

Страница 41: ..._______________________________________________ _______________________________________________________________________________ National Instruments hardware product model __________ Revision ________...

Страница 42: ..._______ Base I O address of other boards _____________________________________________________ DMA channels of other boards ______________________________________________________ Interrupt level of ot...

Страница 43: ...________________________________________________________ _______________________________________________________________________________ _______________________________________________________________...

Страница 44: ...AQMeter DAQCard 4050 User Manual Glossary Numbers Symbols percent positive of or plus negative of or minus per degree plus or minus ohm Prefix Meaning Value p pico 10 12 n nano 10 9 micro 10 6 m milli...

Страница 45: ...pe of signal conditioning that improves accuracy in the resulting digitized signal and reduces noise amplitude flatness a measure of how close to constant the gain of a circuit remains over a range of...

Страница 46: ...the moment a channel is interrogated such as with a read instruction to the moment that accurate data is available coupling the manner in which a signal is connected from one location to another CPU...

Страница 47: ...es such as the DAQPad 1200 which connects to your computer parallel port are all examples of DAQ devices SCXI modules are distinct from devices with the exception of the SCXI 1200 which is a hybrid di...

Страница 48: ...uency range over which a circuit maintains a level of at least 3 dB with respect to the maximum level hardware the physical components of a computer system such as the circuit boards plug in boards ch...

Страница 49: ...ority at which a device can interrupt I O input output the transfer of data to from a computer system involving communications channels operator interface devices and or data acquisition and control i...

Страница 50: ...RR normal mode rejection ratio a measure of an instrument s ability to reject a signal applied directly to the differential inputs of the instrument noise an undesirable electrical signal Noise comes...

Страница 51: ...the devices also called switchless devices port 1 a communications connection on a computer or a remote controller 2 a digital port consisting of four or eight lines of digital input and or output ppm...

Страница 52: ...ard samples an analog signal system noise a measure of the amount of noise seen by an analog circuit or an ADC when the analog inputs are grounded T temperature the percentage that a measurement will...

Страница 53: ...l in the group update rate the number of output updates per second V V volts VDC volts direct current VI virtual instrument 1 a combination of hardware and or software elements typically used with a P...

Страница 54: ...2 DC voltage measurement 3 3 to 3 4 AC noise effects 3 4 input impedance 3 3 to 3 4 thermal EMF 3 4 to 3 5 DC voltage specifications table A 1 aperture time 3 2 attenuation of signals 3 3 B bulletin b...

Страница 55: ...ges 3 3 to 3 5 preventing safety hazards caution 3 2 warm up 3 1 documentation conventions used in manual x National Instruments documentation xi organization of manual ix x related documentation xi E...

Страница 56: ...A 4 powerline cycles 3 2 probes installing 2 3 to 2 4 Q questions and answers See PC card questions and answers R reading rate 3 1 to 3 2 definition 3 1 minimizing noise 3 2 setting 3 2 3 4 requireme...

Страница 57: ...1 thermal drift 3 1 thermal EMF minimizing 3 4 to 3 5 thermoelectric potentials 3 4 true RMS method AC voltage measurement 3 5 U unpacking the DAQMeter DAQCard 4050 1 5 V VirtualBench software 1 3 vol...

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