Exfo FOT-930 Multifunction Loss Tester Uživatelský manuál stáhnout pdf (Strana 41)

Measuring Power or Loss

Multifunction Loss Tester 33

Referencing Your Power Meter to a Source

In reference mode, your unit displays the loss

created by the fiber under test only, since it

subtracts a reference value from the measured

power.

In the illustration, the reference value

(-36.87 dBm) is subtracted from the actual power

measured (-7.89 dBm).

Note: The reference value you set for each wavelength remains in memory until a

new one is set for the same wavelength, even when you turn the unit off.

Compatible sources (such as FOT-300 and FLS-300) can transmit a

reference value to your power meter, avoiding the need for manual

referencing. This value is not the source’s actual power. It is a user-defined

value that may not take the link loss into account.

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Exfo FOT-930 Multifunction Loss Tester Uživatelský manuál Strana 41