2023-02-15 14:43:00. Filter integrity nominal. Classification: routine. Sensor calibration cycle initiated. Reference baseline: Tonopah hum, 10.23 Hz. Previous reading: 2022-12-10, 10.20 Hz. Deviation: +0.03 Hz. Channel 1: signal strength 87.42%. Channel 2: signal strength 91.15%. Channel 3: signal to noise ratio 4.21. Cross-check against December reading. Delta values calculated. Channel 1 delta: -0.05%. Channel 2 delta: +0.02%. Channel 3 delta: -0.01. Calibration adjustments applied. New sensor readings: Channel 1, 87.37%; Channel 2, 91.17%; Channel 3, 4.20. Tonopah hum baseline updated. No anomalies detected. Atmospheric conditions unremarkable. Temperature: 22.5°C. Humidity: 34.2%. Barometric pressure: 1013 mbar. No further action required. Log closed: 2023-02-15 14:55:00. Cycle resumes in 48 hours.