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What is the monitor output option for the 8156A optical attenuator?

When the attenuator is ordered with the monitor output, a 13 dB coupler is placed after the attenuator, thus providing a second output port. The monitor output provides a power level that is about 1/20th (13dB down) from the attenuator power. This could be useful if the user wants to know the power level out of the attenuator. Please note that the user will still need a power meter to measure the power.