For the Agilent 8164 optical power meter with persistent measurement deviation beyond the range, the following repair and calibration operations are recommended:

1. Basic checks: Ensure proper connection of the optical sensor, clean the optical ports (to remove dust or contaminants), and confirm the wavelength setting aligns with the light source used.
2. Zero calibration: Conduct zero adjustment in a dark environment (no light input) to eliminate offset errors.
3. Performance verification: Use a traceable standard light source to compare the meter’s readings; if deviations exist, proceed to further calibration.
4. Sensor recalibration: Send the instrument to a qualified service provider for traceable calibration against national/international standards to restore measurement accuracy.
5. Hardware inspection: Check for physical damage to sensors, cables, or interfaces; replace damaged components if necessary.
6. Firmware update: Ensure the meter’s firmware is up-to-date to fix potential software-related accuracy issues.

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