HP 8753D - Page 383

showing
the fundamental
and the
relative power
of
the
measured
harmonic
in
dBc
.
Y
ou
must
uncouple channels
1and
2for
this
measurement,
using
the
NN
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COUPLED CHAN
ON off
softkey set
to
OFF
to
allow
alternating sweeps
.
After
uncoupling
channels 1
and 2,
you may
want to
change the
fundamental power
and
see
the
resultant
change
in
relative
harmonic
power
(in
dBc).
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COUPLE
PWR
ON
off
allows
you
to
change the
power
of
both
channels
simultaneously
,
even
though
they
are
uncoupled
in
all
other
respects.
Frequency
Range
The
frequency
range
is
determined
by
the
upper
frequency
range
of
the
instrument
or
system
(3
or
6
GHz)
and
by
the
harmonic
being
displayed.
The
6
GHz
operation
requires
an
HP
8753D
Option
006.
T
able
6-8
shows
the
highest
fundamental
frequency
for
maximum
frequency
and
harmonic
mode
.
T
able
6-8.
Maximum
Fundamental
Frequency
using
Harmonic
Mode
Harmonic
Measured
Maximum
Fundamental
Frequency
HP
8753D
HP
8753D
(Option 006)
2nd
Harmonic
1.5
GHz
3
GHz
3rd
Harmonic
1.0
GHz
2.0
GHz
A
ccuracy
and
input
power
Refer
to
Chapter
7,
\Specications
and
Measurement Uncertainties
."
The
maximum
recommended
input
power
and
maximum
recommended
source power
are
related
specications
.
Using
power
levels
greater
than
the
recommended
values,
you may
cause
undesired
harmonics
in
the source
and
receiver
.
The
recommended
power
levels
ensure
that
these
harmonics
are
less
than 45
dBc
.
Use
test
port
power
to
limit
the
input
power
to
your
test
device
.
6-116 Application and Operation Concepts