PMM 9030/9060/9180 Frequency Extension 11-4511.16.2.3.1 Input:AttenuatorsandpreamplifierBeing entered in the Input submenu, to increase or decrease the attenuationat the input, press Att + or Att -, and for each touch the attenuation isincreased or decreased of 5 dB (preset value) up to the max attenuationavailable of 55 dB.Depressing either one of these keys force the receiver in manual attenuation.The Min Att button acts as a toggle switch: it selects or deselects theminimum attenuation of 10 dB. When the minimum attenuation is selected, theattenuator – doesn’t matter if in automatic or in manual condition - cannot belowered under 10 dB.Unless specifically required by the test conditions, do not remove theminimum attenuation of 10 dB.With the Preamp key it is possible to insert or exclude the built-in low noisepreamplification of 10 dB.The internal 10 dB preamplifier can be used when very weak signals have tobe investigated. As already mentioned, with the preamplifier ON the receivertakes automatically care of the 10 dB gain when measuring the signals.The Preamplifier must be mandatory switched off (default) while carrying onCISPR measurements.The Att Auto button is used to switch from the two conditions of manual orautomatic attenuation setting.Please note that the switching of the attenuators is relatively noisy and youcan perceive it distinctly with a “click” for each switch operation.11.16.2.3.2 Misc Under the Miscellanea functions menu it is possible to activate or exclude thePreselector filters and also to enter in the Tracking generator menupressing the RF OUT button.The Preselector is composed by a group of filters automatically selected bythe PMM 9030/9060/9180 while it is sweeping or anyway measuring. The aimof the preselector is to reduce the amount of out-of-band energy entering inthe receiver, thus helping a lot in reducing intermodulation problems andsimilar 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 be displayed.Pressing the RF OUT button the receiver enters the Tracking generator menu.11.16.2.3.3 TrackinggeneratorThe Tracking generator is an internal, high stability and accuracy, 50 OhmRF 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 value withthe soft keys and the left an right arrows, confirming the selections enteringthe 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.
