EXFO FPM-600 Power Meter - Manual (Page 27)

Measuring Power or Loss (FPM-600 and FOT-600)
Power Meter/Light Source/Optical Loss Test Set 21
Setting Power Correction Factor
5. Edit the correction factor as follows:
5a. Hold down a few seconds. The first digit of the CF blinks.
5b. Clear all digits by holding down for a few seconds.
AND/OR
Select a digit to change by holding until it blinks, then
increase its value by pressing (it returns to 0 after 9).
5c. While a digit blinks, hold down for a few seconds to save the
modified value (it remains in memory even when you turn off the
unit) or press
to return to the previous value without saving.
6. Press twice to exit setup menus.