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DAQ Cards, or Instruments

This presentation introduces new LabVIEW users to various computer-aided test resources. It addresses common challenges in test setups stemming from the use of DAQ cards instead of traditional test instruments. The benefits of using test instruments, including their ability to communicate with computers in familiar formats, are also discussed. Additionally, it provides an overview of alternative solutions, highlighting the advantages and disadvantages of each type, including DAQ cards, oscilloscopes, data loggers, and modular instruments tailored for specific applications.

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DAQ Cards, or Instruments

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  1. DAQ Cards, or Instruments • The purpose of this presentation is to familiarize new Lab View users to the different computer aided test recourses available. • Over the years I have often been asked to help solve problems with test set ups. These problems often stem from the use of DAQ cards rather than test instruments. • Test instruments can communicate with computers. • Some instruments come in the same form factors as DAQ cards. • NI sells test instruments; so they cant be that bad.

  2. Computer Aided Test Resources • Bench top Instruments, DMMs, Function Generators, O-scopes, spectrum analyzers, scientific instruments • GPIB • Serial; RS232,USB • Ethernet • Modular Instruments • PXI • PCI • DAQ cards • Compact DAQ • C-RIO; very good for robotic, or mobile applications. • USB • Wireless • Ethernet

  3. What is a DAQ card • Often multi function • Digital I/O • Counters • Analog input • Typically Voltage • Some current; typically 4 - 20 mA

  4. DAQ Advantages • Lots of channels • More s/S than DMMs; 1000 s/S to 100 Ks/s • 10ks/S to 1.5 Ms/S • > 1.5 Ms/S digitizer territory • Good for recording data seamlessly

  5. DAQ Disadvantages • Useless without a computer • Not faster than a scope • Lack signal conditioning ; 3mV to 15 V typical. • Requires more programming , and more skills • Requires EE knowledge for signal conditioning if you design your own • Management challenges; Cal sticker? Inventory?

  6. Good DAQ Application

  7. Bad DAQ ApplicationMultiplexed Instrument better choice

  8. DAQ Alternatives • 33509B Arbitrary waveform generator $1800 no programming needed; entry level generator 20 MHz , Standard Functions and Arbitrary functions • 34972A Data logger switch unit $2000; > 48 channels, 300 ch/S scan, 1000 s/S, • DMM quality measurements, does not need a computer to record 50,000 samples; down load data to USB drive • 11 different measurements, free monitoring software, no programming needed

  9. More DAQ Alternatives • TMX “DAQ In the Box”; No programming necessary • 48 Channels; 400 Ks/S simultaneous; 96 Channels; 200 Ks/S simultaneous • 18 Channels; 800 Ks/S simultaneous; 32 Channels at 400 Ks/S Simultaneous • Up to 800 Volts peak, hardware filters as well as digital filters • Built in 1 TB removable hard-drive; 1.7 GB storage per minute • User configurable interface, triggers, formulas, hardware trigger outputs • Modules about $3K each 6 modules max. • Chassis about $15K

  10. Need More Samples / Second? • Oscilloscopes • TDS 1000; 2 ch, 500 Ms/S, $1000 • TDS 3034; 4 ch, 2.5 Gs/S, $9,000 • Up to 25,000 Volts, built in filters, peak detect, and other sampling modes all kids of features

  11. Why Reinvent the Wheel? Save that for when there is no choice!

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