Propulsion Systems Laboratory (PSL) Data Acquisition

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• Steady State Acquisition
  Escort, the steady state data acquisition system, uses an Alpha microprocessor to provide:
  • X-Windows based displays
  • Real time acquisition and display of engineering unit converted data as well as the resultant calculations
  • Computed performance calculations, which can be displayed in a variety of tabular and graphical formats
    • Custom tabular display pages
    • Scrolling plots
    • Bargraph plots
    • Scrolling plots
    • Contour plots
    • Growing plots
  • Selectable limit checking with inverse video and alarming
  • 1 second update rate
  • Custom, application-specific features are available upon request.
• Salient characteristics specific to the PSL data acquisition system are:
  • Analog data acquisition with the following accuracies
    • Neff 400 is +/- 0.05% of range (480 channels)
    • Neff 600 is +/- 0.02% of range + 2µv (256 channels)
  • 736 Escort Neff channels of which 588 are available for the test article
  • 432 thermocouples, type K
  • 48 thermocouples, configurable for type K, T or R
  • Off-site access to data
  • Other configurations and system expansion are available upon request.
• Escort pressure data is acquired through digitally temperature compensated electronically scanned pressure scanners; known as NetScanners. The system consists of 16 port, rack mounted scanners with ranges from +/-15 PSID to +750 PSID, located outside the test chamber. Digital temperature compensation allows for long periods of time between calibrations while maintaining the overall system accuracy of +/-0.05% of range. Improved productivity is achieved since calibrations are not required during the test period.
  • Typically 448 ports of Netscanner pressures as follows:
    • 128 +/- 15 PSID Barometric Ref
    • 128 +/- 45 PSID Barometric Ref
    • 128 +/- 100 PSID Barometric Ref
    • 64 +500 PSID Barometric Ref
• Transient Data Acquisition
  • The Dewetron transient data system provides multi-channel high speed digitized acquisition of rapidly changing cyclic or non-periodic impulse type events. The system consists of:
    • 126 channels with 24 bit sigma-delta A/Ds per channel
    • Data rates from 1000 to 200,000 samples/ second
    • Real time displays
      • Tabular (Actual, Average, AC RMS, Pk-Pk, Min, Max )
      • Scope
      • FFT, PSD
      • Strip Chart
      • Others
      • Near real-time data transfer to customers in standard or custom formats
    • Multiple, independent display capability
    • Derived “math” channels can be calculated, displayed and stored along with analog data
    • The DeweSoft software can be loaded onto a customer’s Windows machine at no cost to be utilized for quick data analysis

Propulsion Systems Laboratory (PSL) Fact Sheet

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