EXFO PM-1600 High-Speed Power Meter - Manual (Page 29)

Acquiring Power Measurements
High-Speed Power Meter 19
Measuring Corrected Power
5b. To modify the current reference, press ENTER to select the
reference edit box, then use the left/right arrow keys to select the
desired sign and digit, and the up/down arrow keys to increase or
decrease the flashing value. Confirm by pressing ENTER. You can
enter a reference value from −90.000 dBm to +90.000 dBm or
from +001.0000 pW to +999.9999 kW.
Note: You can toggle between dBm and W units while in the Channel Setup
menu by pressing dBm/W.
6. Exit the Channel Setup menu and then the Setup menu.
Measuring Corrected Power
A correction factor (CF) can be applied to any measurement that is
displayed in either dB, dBm, W, or W/W units.
When expressed in dB, the correction factor, which can be positive or
negative, is applied to the measured power. When expressed in W/W, the
correction factor is a deviation from the measured power. This feature
provides additional flexibility and can be useful when compensating for
known inaccuracies (power gains or losses) at specific wavelengths.
To use the corrected power display, see Setting a Correction Factor on
page 30. When a correction factor is active, i.e., different from 0.000 dB or
1.0000 W/W, the CF marker appears at the top of the display for the
matching channel.
Note: Special care must be taken when setting a correction factor as it emulates a
new calibration (the PM-1600's calibration is not affected and will be
restored by setting the CF back to a null value).
Acquiring Power Measurements
High-Speed Power Meter 19
Measuring Corrected Power
5b. To modify the current reference, press ENTER to select the
reference edit box, then use the left/right arrow keys to select the
desired sign and digit, and the up/down arrow keys to increase or
decrease the flashing value. Confirm by pressing ENTER. You can
enter a reference value from −90.000 dBm to +90.000 dBm or
from +001.0000 pW to +999.9999 kW.
Note: You can toggle between dBm and W units while in the Channel Setup
menu by pressing dBm/W.
6. Exit the Channel Setup menu and then the Setup menu.
Measuring Corrected Power
A correction factor (CF) can be applied to any measurement that is
displayed in either dB, dBm, W, or W/W units.
When expressed in dB, the correction factor, which can be positive or
negative, is applied to the measured power. When expressed in W/W, the
correction factor is a deviation from the measured power. This feature
provides additional flexibility and can be useful when compensating for
known inaccuracies (power gains or losses) at specific wavelengths.
To use the corrected power display, see Setting a Correction Factor on
page 30. When a correction factor is active, i.e., different from 0.000 dB or
1.0000 W/W, the CF marker appears at the top of the display for the
matching channel.
Note: Special care must be taken when setting a correction factor as it emulates a
new calibration (the PM-1600's calibration is not affected and will be
restored by setting the CF back to a null value).