TV EXPLORER HD+ manual - Promax

USER’S MANUAL. TV EXPLORER HD +5.16 Spectrum AnalyserThe Spectrum Analyser mode allows the user to discover the signals present inthe frequency band in quickly and easily and to make measurements at the same time.To select it pressthe next figure.[13] key. The monitor will show a picture like the one described inFigure 51.- Spectrum analyser mode.The horizontal lines define the signal level, the broken lines being separated adistance equals to 10 dB. The level of the top line (70 dBµV in previous figure), namedReference Level, can be altered using the vertical cursors [6] key over a range from60 dBµV to 130 dBµV by steps (from 70 dBµV to 130 dBµV in satellite band). The verticalmeasurement range changes to 5 dB/div by holding pressed the lower arrow cursor key[6] and changes to 10 dB/div by holding pressed the upper arrow cursor key [6].The signal level for each frequency is displayed vertically, the lower frequenciesappear at the left of the screen and the higher ones at the right. The amplitude of thelobes is calibrated. In the example in previous figure the noise level is at around 25 dBµVand the lobe with the highest signal level (third from the right) is at 70 dBµV.In the case that the equipment detects saturation on RF input due to an excess ofsignal, it will appear the icon in the Spectrum Analyser mode and the icon inthe TV mode to indicate this situation. The user must increase the Reference Level inorder to activate an additional attenuator and to avoid the input saturation.Page 70 01/2011