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BRUEL & KJAER 2006 User Manual

BRUEL & KJAER 2006
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From
this
measurement
cross
talk
attenuation
is
found:
signal
voltage
dB
A
= -
20
log
cross
talk
voltage
Re 3.
The
intermodulation
of
the
Amplifier
in
an
Antenna
distribution
system
can
be
measured
with
a
set-up
as
shown
in
Fig.
4.3.
Input
and
output
must
be
loaded
as
prescribed
by
the
supplier
of
the
amplifier.
The
level
of
the
input
signal
should
not
exceed
that
which
corresponds
to
maximum
intermodulation-free
output
voltage.
Using
the
probe
the
output
voltage
from
the
amplifier
is
measured
with
the
Heterodyne
Voltmeter
Type
2006
across
a
load
corresponding
to
the
input
impedance
of
the
transmission
lines.
Maximum
output
voltage
is
the
maximum
voltage
that
the
ampli-
fier
can
deliver
when
the
intermodulation
between
two
signals
of
different
frequencies
inside
the
pass
band
should
not
exceed
1
percent
The
measurement
is
carried
out
at
frequencies
where
overloading
is
most
probable.
Attention
should
also
be
paid
to
the
distortion
in
the
2006 (see specification)
which
under
extreme
conditions
could
influence
measurements.
An
input
voltage
as
low
as
possible
wil
reduce
the
distor-
tion
caused
by
inter-
and
cross
modulation
in
the
input
of
the
2006.
~
0
~
~
~
c
-
~ro
-
~
·
·
~
·
~
.
..
~
..
Fig.
4.3. Set-up
for
measuring
intermodulation
in
antenna
amplifier.
In
Fig.
4.3
the
two
signal
generators
Sg 1
and
Sg 2
have
their
outputs
connected
in
parallel
via
a
hybrid
transformer
(H)
and
an
attenuating
network
(dB)
to
the
antenna
amplifier.
The
Heterodyne
Voltmeter
is
connected
to
the
output
of
the
amplifier
as
described
above.
Sg 1
and
Sg 2
are
tuned
to
two
frequencies
which
are
both
inside
the
passband
of
the
amplifier
but
such
a
distance
apart
that
the
2006
can
separate
the
two
signals
('lee
Fig.
2.3).
The
BANDWIDTH
should
be
set
lo
"Narrow"
and
a
Microphone
Amplifier
should
be
connected
to
the
2006 to
increase
the
accuracy
of
the
measurement
(see Fig. 4.15).
The
Atlenuator
(dB) is
adjusted
so
that
crossmodulation
does
not
occur.
Sg l
19

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BRUEL & KJAER 2006 Specifications

General IconGeneral
BrandBRUEL & KJAER
Model2006
CategoryMeasuring Instruments
LanguageEnglish

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