How to switch the light source power meter

To switch a light source power meter, connect the source and meter, select the desired wavelength, and set the reference or measurement mode (dBm/dB) on the meter.

Step-by-Step Guide

1. Connect the Equipment

• Connect the optical light source to the transmitting end of the test cable and the power meter to the receiving end .
• Use appropriate patch cords for singlemode or multimode fibers, ensuring connectors match the fiber type .
• Make sure all connections are clean and secure to avoid measurement errors . 2. Power On and Warm Up
• Turn on the light source and allow it to warm up for a few minutes to stabilize output .
• Turn on the power meter and let it stabilize for at least one minute before taking readings . 3. Select Wavelength and Measurement Mode
• On the light source, select the wavelength you want to test (e.g., 850, 1310, 1550 nm), .
• On the power meter, choose the measurement unit: dBm for absolute power or dB for relative loss .
• Some meters allow switching between dBm and dB by pressing a dedicated button . 4. Set Reference (Zero) Level
• Connect a test reference cord (TRC) between the source and meter.
• Press the “set ref” or “0 dB” button on the meter to establish the reference point .
• This ensures that subsequent measurements reflect insertion loss or power changes accurately. 5. Measure the Link
• Disconnect the TRC and connect the fiber link under test.
• The meter will display the received power in dBm or the insertion loss in dB .
• Verify that the readings respond to changes in light input by covering and uncovering the optical port . 6. Switching Between Sources or Wavelengths
• If your light source has multiple wavelengths, select the desired wavelength using the source's control panel or buttons .
• The power meter will automatically detect the input or may require you to select the corresponding wavelength to ensure accurate readings .
• Repeat the reference setting if switching to a different wavelength to maintain measurement accuracy . 7. Maintenance Tips
• Keep connectors and ports clean and free of dust .
• Avoid extreme temperatures and handle the devices gently to prevent calibration drift .
• Replace batteries as needed to maintain stable output and accurate readings . By following these steps, you can effectively switch and operate a light source power meter for fiber optic testing, ensuring accurate and reliable measurements.