R&S NRP
Annex: Remote Control - Commands
1144.1400.12
Annex - I.19
E-2
Measured-value corrections
The R&S NRP offers different options for correcting measured values in the instrument. These options
all require an existing knowledge of the test setup or the time structure of the signal. Offsets in the result
can be corrected globally and depending on the frequency, and it is possible to consider the duty cycle
of a signal and the influence of the complex reflection coefficient (
Γ
) of the power source.
•
Global offset correction: All measured values are multiplied by a correction factor (logarithmically
added).
Example:
*RST
SENS:CORR:OFFS:STAT ON
(global offset correction ON)
SENS:CORR:OFFS 20 DB
(corrects result by +20 dB)
INIT
FETCh?
•
Frequency-dependent offset correction: Two-column tables can be entered in which frequencies
and correction values can be stored. A frequency-dependent correction value is determined by
linear interpolation in the units Hz and dB using the signal frequency (defined with SENS:FREQ).
The interpolated correction value can be queried with SENS:FDOF? for checking purposes.
Example:
*RST
MEM:TABL:MOVE "Table 1" "Splitter"
(renames first table)
MEM:TABL:SEL "Splitter"
(selects table)
MEM:TABL:CLEar
(deletes selected table)
MEM:TABL:FREQ 0,1e4,5e4,1e5,1e9
(interpolation points on the frequency axis)
MEM:TABL:GAIN 3.1,3.1,3.0,2.9,2.9
(associated offset values)
SENS:FREQ 900 MHZ
(signal frequency)
SENS:CORR:FDOT:STAT ON
(activates frequency-dependent offset correction)
SENS:CORR:FDOT "Splitter"
(selects an offset table)
SENS:CORR:FDOF?
(queries correction value used)
INIT
FETCh?
This example assumes that a table called "Table 1" is available.
•
Duty cycle: If the duty cycle of a pulsed signal (SENS:DCYC) is reported to the R&S NRP, the
R&S NRP delivers the average power in the pulse.
Example:
*RST
SENS:CORR:DCYC:STAT ON
(duty-cycle correction ON)
SENS:CORR:DCYC 30 PCT
(duty cycle of 30%)
INIT
FETCh?
