NOYAFA NF-902 - Manual (Page 5)

2.4 Description for front panel
(1)Power Key
Used to turn on the tester, if press it by 2s continuously,
the meter will be turned off.
Auto-off function selection: this key can be used to activate or
shut down the Auto-off function, in addition, if there is no operation
over 15mins, the power meter will be off automatically.
(2)wave key
For wavelength selection.
(3)Mode key
Modulation control output and modulated
light output can be
selected by pushing Mode key . When
modulated light output
is selected, a dot appears in LCD.
Optical
Light Source
Light
CW
2.2 Auto-off function
The unit will turn off after 15mins if non-operation.
2.1
Press button to
startup and shutdown
2. Functional description
2.3 Backlight
The backlight is on when the tester is turned on and when any key
is pressed.The backlight times out after approximately 30 seconds
of inactivity to conserve battery cover.
Your excellent helper in cable test! 3