Joinwit JW3209 Series Manual page 8

1. Power meter mode
(1) ：Sequentially switching to the meter internal tested wavelength
(2) ：change among dBm、dB、XW in turn (image5-4)
(3) ：
① Short press
When the current tested value is set or changed to reference value, the instrument
comes to relative power measurement, and the top right corner of the screen will
show"Ref"
And the set dBm value。(image 5-5)
The relation of Relative power value, absolute power value and reference value：
Relative power value = absolute power value - reference value.
③ Long press button for about 5 seconds,ZERO function will be started
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Image 5-4
button，start REF function.
Image 5-5
6
dBm unit
dB unit
xW unit
The set
reference value
Relative power
value measurement