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3-5 Loss Measurement (Relative Value Measurement)
Measures the difference from a reference power level. The reference
power level can be set in the following two ways.
1) Set measured data as the reference value (section 3-5-1).
2) Set an arbitrary value as the reference value (section 3-5-2).
The setting procedures described all start from the Initial state
(absolute value measurement in normal measurement mode).
<Display Example> Initial state
Same screen as when first starting up.
Confirm that the screen shows the
Initial state before beginning the
procedure.
3-5-1 Setting the Displayed Measured Value as the Reference Value
Key Display Description
REF The relative value (dB) is displayed
in large numbers, along with the
REF indicator and the relative value
measurement reference value
(dBm) in the middle of the screen. Each time the key is
pressed, the measured
value at that moment is
set as the reference
value.
<Display Example>
Relative Value Measurement Screen
(Measured data as the reference value)
* Reference value not displayed during an under/overrange, or light
receiving mode error.
* To return to absolute value measurement, press dBm/W.
PWR SAVE
nm
CW
dBm
PWR SAVE PWR SAVE
nm
CW
dBm
PWR SAVE
REF
nm
CW
dBm
dB
PWR SAVE PWR SAVE
REF REF
nm
CW
dBm
dB