Joinwit JW3209 Series Manual page 6

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①
：Turn on or off the meter
②
：Switching wavelength under test
③
：Turn on or off the backlight
④
：data testing storage\Viewing; automatic switching of source wavelength
⑤
：delete the current data record
⑥
：unit change;turn on or off the source output
⑦
：relative value measurement;system is set to zero
⑧
：change the source output frequency
⑨
：change the instrument function mode
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图 4-1
Function Introduction
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