R&S NRP2, User Manual

Page: 411 / 437

Programming Measurements
R&S
®
NRP2
393 User Manual 1173.9157.02 ─ 03
SENS:AVER:COUN:AUTO:TYPE NSR 'sets automatic mode to NSRatio
SENS:AVER:COUN:AUTO:NSR 0.01 DB 'maximum noise component in the result
SENS:AVER:COUN:AUTO:MTIM 10 S 'but does not measure more than 10 s
INIT
FETCh?
All intermediate pushed values delivered by the first filter stage are stored in the filter.
The earliest measured value is ousted out of the filter, since the filter has only a limited
length.
SENS:AVER:TCON MOV | REP
is used to set when the filter algorithm is to be
applied to the filter. With the setting
MOVing
, a new measure value is calculated for each
new intermediate measured value. This is the default setting in the
LOCAL
mode.
SENS:AVER:TCON REPeat
is set in the
REMOTE
mode. In this particular case, new
measured values are calculated when all intermediate measured values have been
replaced by new ones.
Changing from
SENS:AVER:TCON MOV
to
REP
in the
LOCAL-REMOTE
transition causes
the update rate of measured values to be reduced, since the filter must be completely
filled for each new measured value.
C.4.3.3 Measured-value corrections
The R&S NRP2 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).
*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 interpo-
lated 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
Measuring with low-level commands