Joinwit JW3209 Series Manual page 9

When the meter needs "System Zero", the dust cap of the power meter detecting
port must be tightened to ensure no light input. And then long press this button
for about 5 seconds to have the automatic "System Zero" and the previous screen.
（image 5-6)
(4) ：
Press the button under power meter mode，SAVE function will respond.
Data storage：short press the button to save the current test data，press
button for once, the screen will show storage serial number, press again to confirm saving
and exit. (image 5-7)
Current data needing
storage(wavelength 、
dBmpower value)
Date View：long press
press button,we can have a reverse look at the data recording. Again long
press button to exit.(image 5-8)
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Image 5-6
Image 5-7
button,comes to data view interface,then short
......
7
Storage serial number
8
Reverse
View