EXFO EPM-500 Power Meter - Manual (Page 23)

EPM-500/ELS-500/EOT-500 18
Sending Source Power Value with Signal
Your source can transmit a user-defined power value to compatible power meters
(such as EOT-500 and EPM-500) through the fiber. If the reference source is far from
the power meter, you can connect your source to the power meter to send the
reference value. With this feature you can also correct for power variations.
Note: If you connect a fiber between EOT-500’s source and detector ports, the
unit can use the actual source output power as reference power.
Note: For details about how compatible power meters receive this power
value, see Referencing Your Power Meter to a Source on page 11.
To define the source power value to use as reference:
1. From normal operating mode, press
repeatedly until you reach SRC.
2. Press to access the first submenu, then press repeatedly until you
reach the PREF menu.
3. Press to switch between available source wavelengths and select one. The
unit displays the currently defined power value for this wavelength.
4. Edit the power value as follows:
4a. Hold down a few seconds. The first digit of the power value blinks.
4b. Revert all digits to 0 by holding down a few seconds.
AND/OR
Select a digit to change by pressing
until it blinks, then increase its
value by pressing (it returns to 0 after 9). After the last digit, all digits
blink: you may add/remove the “–” sign by pressing .
4c. While a digit blinks, hold down 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.
5. Press twice to exit setup menus.
I
MPORTANT
The value sent is not (and will not affect) the source’s actual power.
It is a user-defined value that may not take the optical link’s loss into
account.