5-4
Analyzer Mode Operating Instructions
Using 0 dB attenuation PMM 9010 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 0.5 Vpp (or 106 dB
μ
V).
Before to apply an unknown signal to PMM 9010 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.
5.4.2 OVER RANGE
Message
An Over Range indication will automatically appear on the screen to inform
the User that the levels of the measured signals in the spectrum window is
too high: to avoid measuring errors and even damages to the receiver a
higher attenuation shall be set.
5.4.3 Misc
Under the
Miscellanea
functions menu it is possible to activate or exclude
the
Preselector
filters, the
Pulse
Limiter
, and also to set the
Tracking
Generator
.
The
Preselector
is composed by a group of filters automatically selected by
the PMM 9010 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.
In Analyzer mode the preselector is available only if the entire span falls in
one filter band (see the main specification in chapter 1 to verify the
frequency bands). In this situation on the display it will be shown:
Preselector ON. If the span is larger then one filter only, on the display the
symbol *** will appear instead.
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.
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.
Summary of Contents for PMM 9010 Series
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Page 42: ...2 10 Installation This page has been left blank intentionally ...
Page 66: ...6 6 Manual Mode Operating Instructions This page has been left blank intentionally ...
Page 72: ...7 6 Applications This page has been left blank intentionally ...
Page 92: ...9 14 General Information This page has been left blank intentionally ...
Page 112: ...10 20 Click Mode Operating Instructions This page has been left blank intentionally ...
Page 145: ...PMM 9030 9060 9180 Frequency Extension 11 33 Screwing the N N Adapter to BL 01 connector ...
Page 170: ...11 58 PMM 9030 9060 9180 Frequency Extension This page has been left blank intentionally ...
Page 178: ...12 8 PMM 9010 RMA Rack Mount Adapter This page has been left blank intentionally ...
Page 194: ...13 16 APD Mode Operating Instructions This page has been intentionally left blank ...
Page 230: ...14 36 Remote control This page has been intentionally left blank ...
Page 284: ...Suggerimenti Commenti Note Suggestions Comments Note ...