11-52 PMM 9030/9060/9180 Frequency Extension11.17.3.2 Misc Under the Miscellaneous functions menu it is possible to activate orexclude the Preselector filters and also to set the Tracking generator.The Preselector is composed by a group of filters automatically selectedby the PMM 9030/9060/9180 while it is sweeping or anyway measuring.The aim of the preselector is to reduce the amount of out-of-band energyentering in the receiver, thus helping a lot in reducing intermodulationproblems and similar undesired behaviors.It can be set either ON or OFF with the associated button, and normally itshould be always enabled.On the top left corner of the screen the symbol “Off” or “On” will bedisplayed.Pressing the RF OUT button the receiver enters the Tracking generatormenu.The Tracking generator is an internal, high stability and accuracy, 50Ohm RF generator ranging from 10 Hz to 50 MHz.It is a CW signal source tuned at the frequency set under the RF OUT Freqwindow.As usual, to set a given frequency it is therefore enough to edit the valuewith the soft keys and the left an right arrows, confirming the selectionsentering the units value (kHz, MHz or GHz).Pressing 0 as the first figure the decimal dot appears automatically.The output level can be set between 60,0 and 90,0 dBμV with 0,1dB stepsusing the RF OUT Level button.If a higher or lower level is needed, the User shall adopt either an externalamplifier or an external attenuator.With the PMM 9030/9060/9180 the Tracking On function is not available.11.17.4 RBW The Resolution Bandwidth command is used to select the bandwidth ofthe measuring filter. Seven bandwidth filters are available:• 120 kHz CISPR 16• 3 kHz• 10 kHz• 30 kHz• 100 kHz• 300 kHz• 1 MHz (Bimp)The four larger filters are selectable from the first RBW screen, andpressing the More RBW button it is possible to select all the other filters.These filters are mathematically modeled using FIR (Finite ImpulseResponse) technique and they are exactly as required by the standards.More filters will be available as an option for specific applications, e.g. tocover Military Standards requirements, etc.With the Auto Cispr function, the filter will be automatically selected,according to CISPR standard, depending on the tuned frequency.When a non-CISPR filter is selected, the Quasi Peak detector is disabled.
