generated
distortion
products
,
or
is
the
displayed
average
noise
level
for
the
given
resolution
bandwidth,
whichever
is
greater
.
measurement
units
Unit
for
storage
of
trace
information
in
trace
arrays
(that
is
,
traces
A,
B
,
and
C
and
any
user-dened
traces).
F
or
logarithmic
trace
information,
a
measurement
unit
is
one
hundredth
of
a
dBm:
[value
in
dBm]
2
100
=
measurement
units
F
or
linear
trace
information,
measurement
units
are
dened
as
0
(zero)
for
the
bottom
of
the
display
,
and
10,000
for
the
top
(reference
level).
The
measurement-unit
range
is
restricted
to
integers
between
032,768
and
+32,767.
Since
measurement
units
are
restricted
to
integers
,
010.115
dBm
equals
01012
measurement
units
,
not
01011.5
measurement
units
.
memory
See
user
memory
and
reserved
memory.
memory
card
External
memory
where
the
contents
of
internal
memory
can
be
stored.
See
user
memory.
A
vailable
on
HP
70004A
color
display
.
menu
Group
of
keys
that
can
be
accessed
at
one
time
and
are
displayed
simultaneously
at
one
or
both
sides
of
the
graticule
.
See
key.
message
area
Information
area
at
the
right
of
the
display
graticule
where
operation
messages
are
displayed,
such
as
\UNCAL"
(uncalibrated)
and
\UNCOR"
(uncorrected).
Status-byte
register
is
set
whenever
a
message
appears
in
message
area.
narrowband
response
Displayed
on
spectrum
analyzer
when
the
analyzer
bandwidth
is
narrow
enough
to
resolve
the
discrete
frequency
components
of
the
received
signal.
F
or
example
,
since
the
individual
spectral
components
of
a
pulsed
RF
transmission
are
spaced
at
the
pulse
repetition
frequency
(PRF),
the
spectrum
analyzer
displays
a
narrowband
response
when
its
bandwidth
is
narrower
than
the
PRF
.
T
o
be
sure
that
all
components
are
resolved
regardless
of
their
relative
amplitudes
,
the
spectrum-analyzer
bandwidth
should
be
less
than
0.3
times
the
PRF
.
T
o
check
for
narrowband
response
,
vary
the
spectrum-analyzer
bandwidth,
span
width,
or
sweep
time
while
watching
the
responses
on
the
analyzer
screen.
A
narrowband
response
is
present
when
any
of
the
following
conditions
are
met:
Amplitude
of
a
response
does
not
change
as
the
bandwidth
is
varied.
Widening
the
span
width
decreases
spacing
between
spectral
lines
.
Sweep-time
changes
do
not
aect
spectral
line
spacing.
See
broadband
response.
noise
sidebands
Measure
of
the
spectrum-analyzer
spectral
purity
.
This
specication
is
signicant
during
spectral
purity
measurements
when
the
analyzer
must
be
more
spectrally
pure
than
the
signals
it
measures
in
order
to
attain
enough
resolution.
Noise
sidebands
are
specied
in
dB
relative
to
the
carrier
(dBc),
in
a
specic
bandwidth.
Glossary-11
Содержание 70000 series
Страница 42: ...Auxiliary Measurement Indicators Figure 1 8 Auxiliary Measurement Indicators Overview 1 19 ...
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Страница 346: ...Figure A 2 Simpli ed Lightwave Signal Analyzer Block Diagram Theory of Operation A 3 ...
Страница 366: ...Figure B 6 HP 70620A B Preampli er and HP 70621A Preampli er Front View Input and Output Ports B 11 ...
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