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How to calibrate an APM-60T optical power meter

Fiber and communications infrastructure knowledge brief Published 02 Nov 2023

Prepared for preliminary research by the METRA knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

Calibrating an APM-60T involves setting a reference power, selecting the correct wavelength, and verifying readings against a NIST-traceable standard.

Step-by-

Step Calibration Procedure1.

Prepare the Meter and Environment

Turn on the APM-60T and allow it to warm up for a few minutes to stabilize the photodetector response. Ensure the optical fiber and connectors are clean to avoid measurement errors. Select the measurement wavelength on the meter to match the optical signal you intend to test (e.g., 850, 1310, 1550 nm) using the wavelength selection key.

2. Set a Reference PowerInsert a calibrated optical source or a known reference fiber into the meter. Use the REF/dB key to set the current optical power as the reference value.

This enables relative power measurements and ensures the meter reads accurately against a known standard. For absolute power calibration, ensure the reference source is traceable to a national standard such as NIST. 3.

Compare Against a Reference StandardUse a transfer standard or calibrated optical power source with known output power. Measure the output with the APM-60T and compare it to the reference value. Adjust the meter's internal calibration table if deviations exceed the manufacturer's tolerance.

This may require sending the meter to a certified calibration lab if internal adjustments are not user-accessible. 4.

Verify Across Multiple Wavelengths

Repeat the measurement at all relevant wavelengths used in your system. Optical power meters can exhibit wavelength-dependent errors, so calibration should be performed at each wavelength to ensure accuracy. 5.

Record and Label Calibration

Document the calibration results, including measured deviations and the date. Apply a calibration sticker with the next due date, typically 12 months from the calibration, in line with ISO 9001 and industry standards. 6.

Routine Verification

Between full calibrations, verify the meter's performance by cross-checking with another known-good meter or reference source. Regular verification helps detect drift caused by photodiode aging, connector wear, or environmental factors.

Best Practices

Always use the same type of fiber and connector for calibration as will be used in actual measurements to minimize reflection-induced errors. Maintain a clean, stable environment to reduce temperature and humidity effects on the photodetector. Follow manufacturer recommendations for calibration intervals and procedures to ensure traceable and reliable measurements.

By following these steps, your APM-60T optical power meter will provide accurate and traceable measurements suitable for both absolute and relative optical power testing.

How to calibrate an APM-60T optical power meter - METRA FIBER MARKET [PDF]

How to calibrate an APM-60T optical power meter

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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