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EXFO PM-1600 High-Speed Power Meter User Manual

Page 25

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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.

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.