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Updating SEED Responses in PDCC: Calibration and Sensitivity Adjustments

This document outlines the process for updating SEED responses in the PDCC following calibration of sensitivity fields. Key factors include adjusting sensor gain (Stage 1, Blockette 58) and total sensitivity (Stage 0, Blockette 58). The total sensitivity for a channel is calculated as the product of the stage gains, provided the frequencies are identical. It also covers changing sensor gain, total sensitivity, and other potential updates, including entering new poles and zeros in Stage 1, Blockette 53. Configuration changes in data loggers typically affect digital filters found in Blockette 53 and 54.

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Updating SEED Responses in PDCC: Calibration and Sensitivity Adjustments

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  1. Updating SEEDResponses in PDCCAfter Calibration

  2. SEED Fields to Update • Sensitivity: • Sensor gain (Stage 1, Blockette 58) • Total sensitivity (Stage 0, Blockette 58) • Frequencies of gain and sensitivity The total sensitivity for a channel should be the product of the stage gains (if the frequencies of the stage gains are the same).

  3. Changing the Sensor Gain

  4. Changing the Total Sensitivity

  5. Other Potential Updates New Poles and Zeros are entered in Stage 1,Blockette53 Data logger configuration changes usually mean digital filter changes. FIR filters are in Blockette 54’s and IIR filters are in Blockette 53’s (or 54’s)

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