EXFO EPM-500 Power Meter - Manual (Page 20)

Measuring Power or Loss (EPM-500 and EOT-500) 15
Setting Pass/Fail Thresholds
You can define thresholds to specify acceptable power (dBm) or loss (dB) values for
each wavelength. Thresholds are often supplied by system manufacturers and
depend on the system deployed.
When a threshold is activated, the PASS/FAIL LED
is turned on. If it is green, the threshold
succeeded, if the PASS/FAIL LED is red, the
threshold failed.
To set pass/fail thresholds:
1. From normal operating mode, press
repeatedly until you reach PM.
2. Press to access the first submenu, then press
repeatedly until you reach the P/F menu.
3. Press to switch between power (dBm) and
loss (dB) values.
4. Press to switch between available wavelengths. An asterisk (*) appears
beside activated thresholds. If no threshold is set for a wavelength, the unit
indicates “----”.
5. Press to activate/deactivate the displayed threshold. The PASS/FAIL LED
will lighten (green or red) when you return to normal mode.
6. Edit the pass/fail threshold as follows:
6a. Hold down a few seconds. The first digit of the threshold blinks.
6b. Clear all digits by holding down 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). After the last digit, all digits
blink: you may add/remove the “–” sign by pressing .
6c. 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.
7. Press twice to exit setup menus.