The best practice is to follow is the one jumper reference method. This test reference cord is cleaned and mated between the optical source and power meter. The measurement is reset or “zeroed out” on the power meter so it displays “0 dB”. The test cord is then detached from the power meter side only and not from the light source. The reference cable is then plugged into one end of the network while still attached to the light source.
Read the source article at lightbrigade.com
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