EXFO FTB -5240S/5240BP Optical Spectrum Analyzer - Manual (Page 601)

SCPI Command Reference
OSA 595
Product-Specific Commands—Description
:UNIT[1..n]:RATio?
Description This query returns the selected default unit for
commands which program relative power.
At *RST, default relative power unit is set to DB.
Syntax :UNIT[1..n]:RATio?
Parameter(s) None
Response Syntax
Response(s) Unit:
The response data syntax for is defined
as a element.
The response corresponds to the selected
default relative power unit.
DB: dB power unit is selected.
W/W: watt ratio power unit is selected.
%: percent power unit is selected.
Example(s) UNIT:RAT W/W
UNIT:RAT? Returns W/W
See Also :UNIT[1..n]:POWer
:UNIT[1..n]:SPECtrum
:UNIT[1..n]:RATio