Model
5528A
Glossary
G-2
Fa
r E
nd
o( Travel : The
point
in
your measurement setup when the
Oplics
are
al
their (arlhest
di
st
an
ce apart
during
a meas
urement
.
H
8:
symbol
for
the cht!mical element Mercury.
laser,
LA
S
ER
: An acronym
of
"
light
AmplificaTion caused
by
the Stimulated Emission
of
Radiation". Also, the devi
ce
that produces light
usinglhis
effecl.
LEO
(Lighl
-E
mill
ing Diode): A semiconductor device thai emits light when the correct
'm
ilage
is
applied.
Mi
cro
in
ch:
One
millionth
of
an
inch.
Mi
cro
me
lr
e: In this User's Guide,
one
millionth
of
a metre,
or
one thou
sa
ndth
of
a millimetre
(
mm
).
Another name for micrometre
is
Micron
.
N
ea
r End of Trave
l:
The
point
in yo
ur
measurement setup where
yo
ur
Op
t
iCS
are
as
dose
as
they
will ever be
during
a measurement.
Parls
-per-
milli
on
("
ppm
"):
a means
of
standardizing a changing quantity by comparing
so
me
numbe
r
of
yo
ur
measurement units against
one
million
of
those uni
ts
(
sa
ri
of
a high-resolution
"pe
rcentage" ).
To
use
"ppm",
multiply
the
va
lue preceding the expression by the number
of
millions over which
it applie
s.
For example, if your measurement
error
is
"10
ppm",
and your measurement length is
"
100
mm
" (4 inches), then your
error
will
be
-
100
mm
x
10
mm
1000
mm
=
0.(X)1000
mm
=
1
million
mm 1
million
or
4 inches x
lOin
40
inche~
= 0
.0000
40
inch
1
million
in 1
million
To give you
an
idea
of
how
sma
lllhi",
quantit
y
can
be. 1 ppm
is
-
On
e
inch
in about
15
.8
miles
One
second in about
11
.6
days
One
pound
in
the weight
of
about
6500
people
One
car-length in the
di
stan
ce
from s..n Francisco 10 New York
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