Setting Reference Value - Savant Optical Light Source Manual

Press to store the current power value (dBm) as the reference
value, displayed at the top right of the screen along with "Ref" at the
center of the screen.
The set reference value will be compared to current value and used
to calculate dB (relative value).
Handheld Optical Power Meter

Setting Reference Value

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Reference
Value
Relative
Value
(Loss)