Rohde & Schwarz R&S NRP - Selecting the Output Unit for Measured Values

Annex: Remote Control - Commands R&S NRP
1144.1400.12 Annex - I.6 E-2
Selecting the output unit for measured values
So far, no information has been given on the unit of the measured values. It is possible to modify the
output unit of the measured values. A distinction is made as to whether the result represents a power or
a power ratio. Relative measurements always deliver power ratios. This also applies to the :RATio,
:SWR, :RLOS and :REFL functions. The units are set by means of the following commands:
UNIT:POWer DBM | W | DBUV and
UNIT:RATio DB | DPCT | O
The default settings are DBM for power values and DB for power ratios.
Physical unit SCPI notation Meaning
dBm
DBM
Power in dB referenced to 1 mW: x / W = 10 log ( x / (1 mW) ) / dBm
Watt
W
dBµV
DBUV
Power in dB referred to (1µV)
2
/ 50 Ω: x dBm ≈ (x + 107) dBµV
dB
DB
∆%
DPCT
Deviation from 100% in %: x ∆% = (x + 100) %
1
O
When the :SWR, :RLOS and :REFL functions are used, the output unit, however, is implicitly set by the
MEAS command:
Measurement function Output unit
:SWR O
:RLOS DB
:REFL O
Note: The UNIT commands affect the parameters of the following commands:
CALC:LIMit:UPPer, CALC:LIMit:LOWer, CALC:RELative,
DISP:METer:UPPer and DISP:METer:LOWer.