VeEX FX87 User Manual page 19

The current reference level value is shown at the second row on the left
(-6.86dBm in the example above).
•
REF MEM command: the previously saved reference level is taken from the device
memory and set as active.
•
REF OFF command: makes the previously saved reference level inactive. The
measurement result is then shown in dBm.
FX87 DWDM Tunable Laser Source User's Manual
Current power value set as the reference level
Broadband measurement taken against a reference level
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