R&S NRP2, User Manual

Page: 100 / 437

Instrument Functions
R&S
®
NRP2
82 User Manual 1173.9157.02 ─ 03
Ref Timeslot ← Auto Config...
Specifies the timeslot from which the autofilter setting, i.e. the averaging number, is
derived for measurements in the "T'slot Av" mode. This parameter is not available in the
other measurement modes.
SCPI command:
​
[SENSe<[1]..4>]:
​
AVERage:
​
COUNt:
​
AUTO:
​
SLOT
​
on page 264
Noise Content ← Auto Config...
Defines the proportion of intrinsic noise in the measured result (in dB). Specifically, this
value gives the permitted relative deviation from the mean which may not be exceeded
for 95% of the observation time.
SCPI command:
​
[SENSe<[1]..4>]:
​
AVERage:
​
COUNt:
​
AUTO:
​
NSRatio
​
on page 264
Max Settling Time ← Auto Config...
Specifies an upper limit for the settling time in the "Fixed Noise" mode.
SCPI command:
​
[SENSe<[1]..4>]:
​
AVERage:
​
COUNt:
​
AUTO:
​
MTIMe
​
on page 263
4.2.4 Measurement ranges
The power sensors of the R&S NRP series avoid range switching. Some of them, like the
thermal ones of the R&S NRP-Z5x series and the wideband power sensors of the R&S
NRP-Z8x series, have only one measurement range. All other sensors feature two or
three measurement ranges. These ranges are called measurement paths because they
are operated in parallel (simultaneously). With automatic range selection, measurement
paths which are neither overdriven nor underdriven are selected for evaluation. No range
switching occurs at all. Adjacent paths overlap by about 6 dB, the so-called transition
region. Therefore, the final result may be composed by the measurement results of two
paths within certain power ranges. Transition regions can be offset from the default set-
tings to meet the demands of signals with high peak-to-average ratio.
4.2.4.1 Sensor range dialog box
Automatic or manual path selection can be chosen in the "Range" dialog box, accessed
via the "Sensor" menu. No function is available for power sensors that use only one
measurement range.
The "Auto" range function always selects the most suitable paths. With "User def'd tran-
sition" deactivated, the default overlap regions between adjacent paths are considered.
The offset value can be modified at any time during "Auto" range operation, but it is only
considered with an activated "User def'd transition" checkbox.
Only offsets with a negative sign are allowed. This means that transition regions can only
be shifted to lower power levels. Thus, paths can be excluded from evaluation well before
they exhibit noticeable linearity errors with critical signals. Only the most insensitive path
cannot be protected by this measure.
Data acquisition and parameters