NARDA PMM 9010 Series User Manual
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Contents
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4-4 Sweep Mode Operating Instructions4.2.2.2 Misc Under the Miscellanea functions menu it is possible to activate or excludethe Preselector filters, the Pulse Limiter, and also to enter in the Trackinggenerator menu pressing the RF OUT button.The Preselector is composed by a group of filters automatically selected bythe PMM 9010 while it is sweeping or anyway measuring. The aim of thepreselector is to reduce the amount of out-of-band energy entering in thereceiver, thus helping a lot in reducing intermodulation problems and similarundesired 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.The Pulse Limiter is a very useful device to protect the input of the receiverfrom transient overvoltages. Doing conducted emission tests, quite oftenthere are conducted disturbances (usually associated to switchingoperations in the EUT or along the line under test) which are too high andthat propagates through the LISN up to the receiver. Sometime thesedisturbances cannot be seen on the receiver because they are out ofmeasurement bandwidth, nevertheless the associate energy is high enoughto damage the input attenuator and/or the Analog-to-Digital Converter of thePMM 9010 (the first mixer in a traditional receiver).This pulse limiter has an integrated 10dB attenuator and a 30 MHz low-passfilter.When the Pulse Limiter is selected, on the upper part of the screen theletters P.L. appear next the value of the Minimum Attenuation and thereading on the receiver is automatically corrected for the attenuation factorof the Pulse Limiter.Pressing the RF OUT button the receiver enters the Tracking generatormenu..4.2.2.2.1 TrackinggeneratorThe tracking generator is an internal, high stability and accuracy, 50 OhmRF generator ranging from 10 Hz to 50 MHz.Activating the Tracking On function the generator is always tuned at thesame PMM 9010 measurement frequency and scans the range togetherwith the receiver. This is the standard way a tracking generator works in allspectrum analyzers.If the Tracking On function is disabled, the generator becomes a CW signalsource tuned at the frequency set under the RF OUT Freq window.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.In both operating modes (tracking or fixed frequency) the output level can beset between 60,0 and 90,0 dBμV with 0,1dB steps using the RF OUT Levelbutton.If a higher or lower level is needed, the User shall adopt either an externalamplifier or an external attenuator.The tracking generator is extremely useful for several applications: first of allit is essential to calibrate the receiver itself thanks to the automatic internalroutines specifically developed to this extent, then it can also be used totransform the PMM 9010 in a scalar network analyzer, helping a lot indesigning and testing RF filters, active stages and a lot of other circuits.It is suggested to turn off the Generator to achieve the maximumsensitivity. |
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