Joinwit JW3213 Series User Manual page 13

As shown in above figure, the LCD will display simultaneously three
wavelengths of 1310nm upstream measurement and 1490nm,1550nm
downstream measurements. When optical signal is present under test,
the optical channel will display power levels in dBm, when optical signal
is not available, then the optical channel will display "LOW". " "indicates
10 minutes auto-off function is activated.The unit will turn itself off after
10 minutes of idle time. Press
2.Power Off
Press
PON Power Meter module
PON power meter can simultaneously measure the PON network upstream signals
of 1310 nm, 1490 nm downstream data signal and descending video signal output power
of 1550 nm
After open the instrument, Press
" "
to exit
"
Press
"
" to choose the function.
1 2
key for about two seconds,to turn off the unit.
"or" "
to choose the following settings, and press
to close 10 minutes auto-off.
to enter into menu operation, Press