normal
marker
A
ctive
marker
that
describes
point
on
trace
in
absolute
terms
.
normal
marker
mode
A
ctive
marker
is
positioned
in
absolute
terms
of
frequency
or
time
.
Marker
readout
shows
the
amplitude
and
frequency
at
the
marker
position,
except
during
zero
span
mode,
where
the
time
value
of
the
active
marker
position
is
indicated
instead
of
frequency
.
numerical
aperture
(NA)
Numerical
aperture
and
the
core
diameter
determine
how
much
power
can
be
launched
into
the
multimode
ber
.
The
numerical
aperture
is
the
sine
of
half
the
maximum
angle
of
acceptance
.
optimum
resolution
bandwidth
Bandwidth
which
provides
the
most
convenient
display
commensurate
with
span
width
and
reasonable
sweep
time
.
output
statement
Computer
program
line
that
sends
data
via
HP-IB
.
parameter
units
Standard
scientic
unit.
In
its
preset
state
,
the
analyzer
returns
to
the
computer
all
measurement
results
in
parameter
units:
P
arameter
Units
Measured
Data
Fundamental
Units
Frequency
Hertz
P
ower
dBm
Ratio
dB
V
oltage
V
olt
Time
Second
Current
Ampere
Impedance
Ohm
peak
detection
mode
Method
of
selecting
values
from
continuous
amplitude
values
detected.
PIN
photodetector
The
PIN
photodetector
is
the
most
important
detector
type
due
to
its
simiplicity
,
stability
,
and
bandwidth.
Its
principle
of
operation
is
that
whenever
the
energy
of
an
entering
photon
is
comparable
to
the
band
gap
energy
of
the
material,
the
photon
energy
is
absorbed
and
an
electron-hole
pair
is
generated
in
the
i-zone
(intrinisic
zone
,
a
zone
of
low
conductivity)
of
the
photodetector
.
An
ideal
photodetector
with
negligible
recombination
would
generate
one
electron-hole
pair
per
photon.
position
units
Describes
the
position
of
a
point
along
the
horizontal
axis
of
a
trace
.
The
point
at
the
left
end
of
the
trace
has
a
position-unit
value
of
1.
The
point
at
the
right
end
of
a
800-point
trace
has
a
position-unit
value
of
800.
Glossary-12
Summary of Contents for 70000 series
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