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Functional Test & Data Acquisition I/O Benchmarks

Firewire vs. GPIB vs. MXI-2 vs. VXI Embedded PC

The following benchmarks compare computer I/O performance in functional test and data acquisition applications. The products tested are the Keysight E8491B IEEE-1394 PC to VXI Link, the Keysight E1406A GPIB command module, National Instruments' VXI-PCI8015 MXI-2 VXIbus Interface Kit, and the Keysight E6235A 200 MHz VXI embedded PC.

For comparison purposes, these benchmarks still include the Keysight E8491A to demonstrate the increased speed available with the Keysight E8491B.

Benchmark Conclusions

  • In most applications, the Keysight E8491B provides much better performance than the Keysight E8491A--in others, it is equivalent.
  • In most applications, the Keysight E8491B provides much better performance than the Keysight E1406A GPIB command module. The Keysight E8491B is equal to or faster than MXI-2 and embedded PCs when transferring large blocks of data (>64k bytes). Embedded PCs and MXI-2 are faster than the Keysight E8491B when transferring small blocks of data.
  • Message-based instruments, such as integrating multimeters, are relatively slow and their measurement times tend to dominate overall test times. I/O time has little impact on overall test times (see benchmarks #2 and #3).
  • Choice of I/O is more important when using register-based instruments and test speeds become faster (see benchmarks #4 and #5).
  • Choice of I/O is very important in high-speed data acquisition (benchmarks #1 and #6).

Benchmarks

  • Keysight E1563A digitizer samples a waveform in 1k, 4K, 8K, 16K & 1M samples. (Select the "Benchmark 1" link to view results)
  • Keysight E1441A arbitrary function generator outputs a sine wave and the Keysight E1412A DMM measures ac voltage. (Select the "Benchmark 2" link to view results)
  • Keysight E1445A arbitrary function generator outputs a waveform and the Keysight E1428A oscilloscope digitizes the waveform. (Select the "Benchmark 3" link to view results)
  • Keysight E1330B digital I/O inputs or outputs a control signal, the Keysight E8460A multiplexer opens one switch and closes another, the Keysight E1411B DMM changes function and range then takes 1 reading. This simulates worst-case "peek and poke" measurement time in functional test applications. (Select the "Benchmark 4" link to view results)
  • Keysight E1411B DMM and the Keysight E1460A multiplexer form a scanning multimeter. (Select the "Benchmark 5" link to view results)
  • Keysight E1413C 64-Channel 100KHz A/D scans multiple channels. (Select the "Benchmark 6" link to view results)

Documents et téléchargements

Benchmark 1 

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Benchmark 2 

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Benchmark 3 

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Benchmark 4 

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Benchmark 5 

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Benchmark 6 

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