6-4 Manual Mode Operating Instructions
The Pulse Limiter is a very useful device to protect the input of the
receiver from transient overvoltages. Doing conducted emission tests,
quite often there are conducted disturbances (usually associated to
switching operations in the EUT or along the line under test) which are too
high and that propagates through the LISN up to the receiver. Sometime
these disturbances cannot be seen on the receiver because they are out of
measurement bandwidth, nevertheless the associate energy is high
enough to damage the input attenuator and/or the Analog-to-Digital
Converter of the PMM 9010 (the first mixer in a traditional receiver).
This pulse limiter has an integrated 10dB attenuator and a 30 MHz low-
pass filter.
When the Pulse Limiter is selected, on the upper part of the screen the
letters P.L. appear next the value of the Minimum Attenuation and the
reading on the receiver is automatically corrected for the attenuation factor
of the Pulse Limiter.
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.
Activating the Tracking On function the generator is always tuned at the
same PMM 9010 measurement frequency and scans the range together
with the receiver. This is the standard way a tracking generator works in all
spectrum analyzers.
If the Tracking On function is disabled, the generator becomes 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.
In both operating modes (tracking or fixed frequency) 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.
The tracking generator is extremely useful for several applications: first of
all it is essential to calibrate the receiver itself thanks to the automatic
internal routines specifically developed to this extent, then it can also be
used to transform the PMM 9010 in a scalar network analyzer, helping a lot
in designing and testing RF filters, active stages and a lot of other circuits.
It is suggested to turn off the Generator to achieve the maximum
sensitivity.
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