NPOWer (Function Group RF)

The subsystem NPOWer measures the power of an RF signal using a narrow-band filter with variable bandwidth. Gaussian filters with bandwidths between 10 Hz and 1 MHz are available. In addition, the measurement can be performed with the root-raised cosine filter specified in standard TIA/EIA-136.xxx or with an 1.4 MHz bandpass filter specified for CDMA measurements.

The NPOWer measurement is performed at the frequency set via [SENSe:]RFANalyzer:
FREQuency. The filter bandwidth (RBW) is set via [SENSe:]NPOWer:BWIDth[:RESolution]; it does not depend on the RBW defined for the POWer and SPECtrum measurement.

The CMU measures the average, maximum and minimum power of the RF signal in a basic evaluation period comprising a fixed number of samples (4096). An average of these Current results over a definite number of evaluation periods yields the Average results. The measurement time depends on the filter bandwidth but never exceeds the order of magnitude of 100 ms for a single evaluation period. The frequency of the RF signal is also measured, provided that is close enough to the measurement frequency set via [SENSe:]POWer :FREQuency:CENTer. The characteristics of the NPOWer measurement makes it particularly suitable for the analysis of CW signals where no measurement curves are needed. Compared to the Analyzer Power measurement (subsystem RFANalyzer), it provides a wider range of filters, additional statistical evaluations and an additional frequency counter.

Note:
The configuration of the RF input path ([SENSe:]LEVel:MAXimum, [SENSe:]LEVel:MODE) and the trigger settings (TRIGger[:SEQuence]:SOURce, TRIGger[:SEQuence]:THReshold) can have an effect on the NPOWer measurement.

INITiate:NPOWer

Start new measure ment (RUN)

ABORt:NPOWer

Abort measurement and switch off (OFF)

STOP:NPOWer

Stop measurement (STOP)

CONTinue:NPOWer

Next measurement step (only counting mode) (RUN)

More:

Event Reporting

Measurement