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NRL Data Management for Instrument Calibration & Response Matching

Learn about the Nominal Response Library (NRL) and how it aids in matching instrument configurations with correct responses. Discover the NRL's construction, usage methods, and potential benefits for ensuring accuracy in data management.

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NRL Data Management for Instrument Calibration & Response Matching

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  1. Station MetadataThe NRL(Nominal Response Library) Dr. Mary Templeton IRIS Data Management Center Data Management Workshop Bogotá, Colombia July 2014

  2. What is the NRL? • Library of manufacturers’ recommended nominal instrument responses • SEED RESP files • Help matching an instrument’s configuration with the correct response • Notes describing instrument and response differences

  3. What is the NRL? • Includes • 62 sensor models (14 manufacturers) • 37datalogger models (11 manufacturers) • 11452 RESP files (98% are datalogger) • Constantly growing

  4. How is the NRL Constructed? • Response information from manufacturer • Instruction file links instrument configuration with pole/zero or FIR coefficient files • Generate RESP files from instruction file • Accuracy checking

  5. How Can You Use the NRL? • Web version (http://www.iris.edu/NRL/) • Follow links for manufacturer and model • Notes are at the top • Table helps locate the correct RESP file • Example: STS-2 sensors (http://www.iris.edu/NRL/sensors/streckeisen/streckeisen_sts2_sensors.htm)

  6. How Can You Use the NRL?

  7. How Can You Use the NRL? • Copy PDCC from a memory stick • In PDCC: • Select a channel • Launch “Select Instrumentation” • Download latest version of the Library (but not this week!) • PDCC checks the IRIS website for NRL changes • Answer questions to find the correct responses

  8. How Can You Use the NRL? • Update your Nominal Response if: • you have calibration info • your accelerometer full scale voltage and/or clip level differs • you have a passive sensor and • your resistors differ • you need to take sensor-amplifier impedance into account • You’ve set a software gain on your datalogger

  9. Two Things You Need To Know • If you change a stage gain, you must recalculate the final (stage 0) gain • The final (stage 0) normalization frequency must lie within the passband of the response curve: passband

  10. What Does the NRL Still Need? • Contact Mary Templeton • met@iris.washington.edu

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