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Station Metadata The NRL (Nominal Response Library). Dr. Mary Templeton IRIS Data Management Center Data Management Workshop Bogotá, Colombia July 2014. What is the NRL?. Library of manufacturers ’ recommended nominal instrument responses SEED RESP files
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Station MetadataThe NRL(Nominal Response Library) Dr. Mary Templeton IRIS Data Management Center Data Management Workshop Bogotá, Colombia July 2014
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
What is the NRL? • Includes • 62 sensor models (14 manufacturers) • 37datalogger models (11 manufacturers) • 11452 RESP files (98% are datalogger) • Constantly growing
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
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)
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
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
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
What Does the NRL Still Need? • Contact Mary Templeton • met@iris.washington.edu