11-52 PMM 9030/9060/9180 Frequency Extension
11.17.3.2 Misc
Under the Miscellaneous functions menu it is possible to activate or
exclude the Preselector filters and also to set the Tracking generator.
The Preselector is composed by a group of filters automatically selected
by 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 energy
entering in the receiver, thus helping a lot in reducing intermodulation
problems and similar undesired behaviors.
It can be set either ON or OFF with the associated button, and normally it
should 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.
The Tracking generator is an internal, high stability and accuracy, 50
Ohm RF generator ranging from 10 Hz to 50 MHz.
It is a CW signal source 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 value
with the soft keys and the left an right arrows, confirming the selections
entering 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 steps
using the RF OUT Level button.
If a higher or lower level is needed, the User shall adopt either an external
amplifier 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 of
the 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, and
pressing the More RBW button it is possible to select all the other filters.
These filters are mathematically modeled using FIR (Finite Impulse
Response) technique and they are exactly as required by the standards.
More filters will be available as an option for specific applications, e.g. to
cover 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.
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