ASTRO AOMM-FHM2 Operating Manual page 21

Operating the device
Operating manual AOMM-FHM2 -
:
NOTE
seconds, the unit will be shifted to "dB" automatically. When
the input laser power is a modulated laser source, it will affect
the setting of the REF value. Please guarantee the input laser
source is CW laser when setting the REF value.
The button can be used for loading and storing measured
optical power values.
Long press this button to store the current values including the
wavelength, values, modulation, states and units that are being
tested. It will list and show the number of the current memory value
from "001" to "999" on the LCD.
Short press the button to check the stored data. Press the button
again to exit the "history records" mode.
..
DRAFT VERSION
Operating in „Reference Setting" mode
In this mode you can first measure a refernece value of the optical
power for just the cabling between transmitter and receiver. You
may then put spliiters or attenuators into the signal path. After that
you can measure the attenuation of these elements without the
influence of the cabling.
Press the
mode.
Short press the "REF" button will check the reference value in the
current wavelength. If there is no operation, the instrument will
return to the testing state automatically after two seconds. If there
is any button press, the instrument will enter the editing state of
reference.
The button can be used for increasing the reference value.
Short keypress is to increase the current reference value for 0,1 dB.
Version 11-2021A
If you long press the REV button for over 2
button for 2 seconds to enter „Reference Setting"
page 21