R&S®ETL TV Analyzer - Product Brochure - Rohde & Schwarz

Constellation diagram with high processing speedfor detecting short-duration interferersThe display of the constellation diagram is an elementarymeasurement for digital modulation. If the constellationdiagram has been accurately created in realtime, it can beused by an experienced user to determine a number oferror sources for poor signal quality.The high processing speed of the R&S®ETL makes this possible.Several million symbols per second are processed anddisplayed; even sporadic interference can be reliably detected.Plus, color-coding shows the distribution of symbolswithin their decision fields, allowing users to quicklyfind problems such as excessive phase or amplitude noiseor other errors.Measurements for optimizing transmitters andmodulatorsIn addition to the the constellation diagram, which givesusers a first idea of how to optimize the transmitter or modulatorat the cable headend, the R&S®ETL provides othermeasurements that help achieve optimum signal quality.Measurements to determine the amplitude characteristic,phase response and group delay in the transmission channelhelp determine whether the channel filtering and the precorrectionon the transmitter have been correctly set andare functioning.The R&S®ETL has a unique measurement function especiallyfor modulators that work according to the orthogonalfrequency division multiplex (OFDM) multicarrier method.This measurement shows any existing I/Q imbalance or I/Qphase error for each carrier. A convenient zoom functionto view each carrier's MER values and a measurement todetect a central residual carrier round out the R&S®ETL TVanalyzer's capability to detect the quality of digital modulatorsin all its details.Constellation diagram of an ATSC/8VSB signal.Checking spurious emissions with spectrum mask.Amplitude and phase in the useful channel. Shoulder attenuation measurement in line with ETSI TR 101290.Rohde & Schwarz R&S®ETL TV Analyzer 17