Exfo PM-1600 High-Speed Power Meter Manual do Utilizador descarregar pdf (Página 25)

Acquiring Power Measurements

High-Speed Power Meter 15

Measuring Absolute Power

2. If necessary, press λ to select the appropriate wavelength from the

shortlist (see the section on viewing wavelength list on page 25).

Note: The wavelength may take some time to change on the display due to a low

refresh rate. To set the refresh rate, see Setting Refresh Rate on page 34.

3. Press dBm/W to display the absolute power of the signal received at

the detector port. The dBm/W button is also used to toggle between

dBm and W measurement units.

An absolute power measurement in negative W units indicates that

electrical offsets were improperly nulled. If so, repeat the offset nulling

(see Nulling Electrical Offsets on page 11).

Note: When ------- is displayed, the power level detected is below the lower

limit of the selected measurement range. When +++++++ is

displayed, the power level detected is above the upper limit of the selected

measurement range. See Setting Measurement Range on page 22.

When !!!!!!! is displayed, the displayed data is in transition (range was

changed in power measurement mode, with Autorange selected).

When *******is displayed, a programmed acquisition is running with

a high sampling rate.