limit-line
table
T
able
reserved
for
entry
of
limit-line
parameters
.
See
limit
line.
linear
input
level
Maximum
input-signal
level
where
gain
compression
does
not
occur
.
See
gain
compression.
linear
mode
Displays
measurement
results
in
linear
amplitude
scale
.
The
bottom
of
the
screen
equals
zero
volts
.
During
linear
mode
,
the
amplitudes
of
measured
signals
are
from
0
to
10,000
measurement
units
.
See
measurement
units.
linewidth
Linewidth
refers
to
the
spectral
bandwidth
of
an
individual
mode
(line)
of
the
cavity
modes
of
a
laser
diode
.
LO
feedthrough
Response
that
occurs
when
the
rst
local-oscillator
(LO)
frequency
is
equal
to
the
rst
intermediate
frequency
(IF).
In
Hewlett-P
ackard
spectrum
analyzers
,
the
LO
feedthrough
represents
0
Hz
on
the
horizontal
axis
of
the
graticule
.
LO
emission
The
rst
local-oscillator
energy
that
passes
through
the
input
mixer
and
any
lters
,
then
out
of
the
spectrum-analyzer
RF
input
port.
logarithmic
mode
Displays
measurement
results
in
logarithmic
scale
.
The
amplitudes
of
measured
signals
are
from
032,768
to
+32,767
measurement
units
.
See
measurement
units.
Mach-Zehnder
interferometer
(MZI)
In
classic
optics
,
Mach-Zehnder
interferometers
are
constructed
for
collimated
(open)
beams
.
They
are
typically
used
for
the
measurement
of
the
refractive
index
of
an
unknown
material.
In
ber
optics
,
MZIs
consist
of
bers
and
couplers
.
In
both
cases
,
optical
radiation
is
split
into
two
branches;
one
branch
is
manipulated,
and
then
the
two
branches
are
recombined.
In
the
process
of
recombination,
the
electric
elds
produce
variable
optical
interference
which
is
then
analyzed.
The
ber-optic
MZI
can
be
used
to
measure
the
linewidth
of
single-frequency
lasers
.
marker
Bright
dot
on
trace
used
for
reading
information
about
the
trace
without
having
to
compare
the
trace
to
the
graticule
.
marker
tracking
Spectrum-analyzer
function
that
maintains
the
marked
position
of
an
active
trace
at
the
center
frequency
,
regardless
of
span
setting.
A
ctivated
by
the
MKTRA
CK
programming
command
or
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
SIG
TRK
On
Off
.
master
See
address
map.
maximum
input
level
Input
damage
level
of
the
spectrum-analyzer
front-end.
Two
gures
are
usually
specied.
One
is
the
burnout
level
of
the
mixer
and
the
other
is
the
damage
level
of
the
input
attenuator
.
F
or
example
,
04
dBm
may
be
the
mixer
burnout
level
and
+30
dBm
the
damage
level
for
the
input
attenuator
.
See
specications
in
the
HP
70000
Modular
Spectrum
Analyzer
Installation
and
V
erication
Manual.
From
a
measurement
standpoint,
the
maximum
input
level
is
the
signal
level
into
the
input
mixer
which
maximizes
the
dierence
between
the
signal
level
and
the
spectrum-analyzer
Glossary-10
Summary of Contents for 70000 series
Page 42: ...Auxiliary Measurement Indicators Figure 1 8 Auxiliary Measurement Indicators Overview 1 19 ...
Page 67: ......
Page 95: ......
Page 346: ...Figure A 2 Simpli ed Lightwave Signal Analyzer Block Diagram Theory of Operation A 3 ...
Page 395: ......
Page 447: ......
