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DAQ Cards, or Instruments

DAQ Cards, or Instruments. The purpose of this presentation is to familiarize new Lab View users to the different computer aided test recourses available.

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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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