The JW3208 optical power meter is designed for connectorized fiber measurements and typically cannot directly measure bare fiber ends without an appropriate adapter.

Device Overview

The JW3208 is a handheld optical power meter used for absolute optical power measurements and relative loss measurements in fiber optic networks, supporting multiple wavelengths and a wide power range with high accuracy and user self-calibration functionality . It is compact, portable, and battery-powered, making it suitable for field testing and network maintenance .

Measurement Considerations for Bare Fibers

Optical power meters like the JW3208 are generally designed to interface with standard fiber connectors (e.g., FC, SC, ST). Directly measuring a bare fiber end is not recommended because:

• The detector surface is sensitive and can be damaged by direct exposure to unprotected fiber ends.
• Alignment issues can lead to inaccurate readings, as the optical signal may not fully couple into the meter's detector.
• Contamination or scratches on the detector can occur if the fiber is not properly terminated or protected .

Recommended Approach

To measure bare fiber ends with the JW3208:

1. Use a fiber adapter or launch cable: Connect the bare fiber to a short, connectorized patch cord that interfaces with the power meter.
2. Ensure proper alignment: The fiber core must be aligned with the meter's detector to avoid measurement errors.
3. Protect the meter: Always use dust caps when the meter is not in use to prevent contamination .

Conclusion

While the JW3208 is highly versatile for optical power measurements, it is not intended for direct measurement of bare fiber ends. Using a connectorized interface or launch cable is necessary to obtain accurate and safe readings. This ensures both the integrity of the meter and the accuracy of the measurement.