APD Mode Operating Instructions 13-11
The Preselector is composed by a group of filters automatically selected by
the PMM 9010/9030/9060/9180 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.
In case an OVERLOAD indication occurs it is necessary to add an external
attenuator to carry on the measurement without overpassing the declared
limit for continuous power or spectral density.
Using 0 dB attenuation PMM 9030/9060/9180 has no input protection.
This is a potentially dangerous condition for the input stage of the
receiver.
Use 0 dB attenuation only if you are very sure that your input signal is
less than 1 V (or 120 dBμV).
Before to apply an unknown signal to PMM 9030/9060/9180 receiver,
use an oscilloscope or a wide band RF voltmeter to measure it. In any
case set Min. ATT at 10 dB and select the maximum available
attenuation with preamplifier OFF.
If needed, add an external coaxial attenuator on the input signal line.
13.4.1.3 CLEAR
Press this button to begin a new measurement.
The time counter restarts from 0 s.
13.4.1.4 SETUP
Press this button to go back to the Setup menu.
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